ATC Application Handbook
Section 2
Issue Date 0500

AHU Control
Duct type 2-pipe cooling only

Equipment Wiring

Note:
1. R: Relay contact interlock
with blower.
2. Refer to DH100 wiring
diagram for wiring the
smoke detector. (Attached
at the end of this section)
3. If 3 way mixing valve
instead of 2-way valve is
used, the wiring at terminals
2 & 3 of the actuator TV-1
should be interchanged.

Operation Description
Proportional plus integral temperature controller (TC-1)
together with remote duct temperature sensor (TE-1)
provides modulating control for the motorized cooling
valve (TV-1), so as to maintain the desired return air
temperature.
Temperature controller (TC-1) also provides comfort/
Standby mode selection button and set point dial.

The controller interlocks with the supply fan status, so that on
fan shut down, the controller will be switched off, the cooling
valve will be driven to its closed position.
The differential pressure switch (DPS-1) monitors the status of
filter, when the set point is exceeded, a signal will be given to
switch on 'filter change' indicating lamp on the control panel.
The smoke detector (SD-1) monitors the smoke status. Once
smoke is detected, the fan will be shut down.

Equipment List
Instr. No.

Code No.

Description

TE-1

TS-9104-8220

Duct type temp. sensor

TC-1

TC-8903-1132-WK

12/28 C, PI analogue controller, remote sensor, 24V

SD-1


DH100ACDCP

Duct type smoke detector (Photo)

ST-3

Sampling Tube

DPS-1

P32AC-2

0/5" W.C. differential pressure switch

X-1

Y62HKL-40

Transformer, 40VA, 240/220/24V

TV-1

Refer to Valve Schedule (Section 3)

Valve & Valve Actuator with 24 VAC power supply

1 of 30

AHU-1



ATC Application Handbook
Section 2
Issue Date 0500

AHU Control
Duct type 2-pipe cooling, electric heater

Equipment Wiring

Operation Description
Mode selector switch is provided to select the mode of
operation - cooling or heating.
When the system is switched in cooling mode,
proportional plus integral temperature controller (TC-1)
together with remote duct temperature sensor (TE-1)
provides modulating control for the motorized cooling
valve (TV-1), so as to maintain the desired return air
temperature.
Temperature controller (TC-1) also provides comfort//
Standby mode selection button and set point dial.
When the system is switched in heating mode,
Electronic heating thermostat (TS-1) together with its
associated stage module (SM-1) and remote duct
temperature sensor (TE-2) provide on-off control of the
3 stages electric heater bank.

A high limit cutout thermostat with manual reset (HL-1) is
installed to de-energise the electric heaters in the event of
excessive high temperature built up in the supply air duct.

Air flow switch (FS-1) provides safety interlock such that
electric heaters can only be energised when the fan running.
The controller interlocks with the supply fan status, so that on
fan shut down, the controller will be switched off, the cooling
valve will be driven to its closed position, and the heaters will
be de-energised.
The differential pressure switch (DPS-1) monitors the status of
filter, when the set point is exceeded, a signal will be given to
switch on 'filter change' indicating lamp on the control panel.
The smoke detector (SD-1) monitors the smoke status. Once
smoke is detected, the fan will be shut down.

2 of 30

AHU-2


ATC Application Handbook
Section 2
Issue Date 0500

AHU Control
Duct type 2-pipe cooling, electric heater

Equipment List
Instr. No.

Code No.

Description


TE-1

TS-9104-8220

Duct type temp. sensor

TC-1

TC-8903-1132-WK

12/28 C, PI analogue controller, remote sensor, 24V

TE-2

A99DY-200C

Duct temperature sensor

TS-1

A27A1N11

-40/40 C, din-railmount electronic thermostat, 24VAC

SM-1

S27A1

Din-railmount stage module,24VAC


HL-1

A25AN-9

Hi-limit cutout, manual reset, 237mm

FS-1

F62AA-8

Air flow switch

SD-1

DH100ACDCP

Duct type smoke detector (Photo)

ST-3

Sampling Tube

DPS-1

P32AC-2

0/5" W.C. differential pressure switch

X-1


Y62HKL-40

Transformer, 40VA, 240/220/24V

TV-1

Refer to Valve Schedule (Section 3)

Valve & Valve Actuator with 24 VAC power supply

Note:
1. R: Relay contact interlock with blower.
2. Refer to DH100 wiring diagram for wiring the smoke detector.
(Attached at the end of this section)
3. If 3-way mixing valve instead of 2-way valve is used, the
wiring at terminals 2 & 3 of the actuator TV-1 should be
interchanged.
4. More stage modules can be connected to TS-1, for details,
please refer to system 27 catalogue.
5. The jumper setting for directed or reversed control in TS-1
and SM-1 should be refer to installation sheet.

3 of 30

AHU-2


ATC Application Handbook
Section 2

Issue Date 0500

AHU Control
Duct type 2-pipe cooling, electric heater & dehumidification

Equipment Wiring

Operation Description
Proportional plus integral temperature controller (TC-1)
together with remote duct temperature sensor (TE-1)
provides modulating control for the motorized cooling
valve (TV-1), so as to maintain the desired return air
temperature.

A high limit cutout thermostat with manual reset (HL-1) is
installed to de-energise the electric heaters in the event of
excessive high temperature built up in the supply air duct.
Air flow switch (FS-1) provides safety interlock such that
electric heaters can only be energised when the fan running.

Temperature controller (TC-1) also provides comfort/
Standby mode selection button and set point dial.

The controller interlocks with the supply fan status, so that on
fan shut down, the controller will be switched off, the cooling
valve will be driven to its closed position, and the heaters will
be de-energised.

Electronic humidistat (HS-1) together with remote duct
humidity transmitter (HE-1) provides dehumidification.

Once the return air R.H. increases above the set point,
the cooling valve (TV-1) will be driven to its fully open
position.
Electronic heating thermostat (TS-1) together with its
associated stage modules (SM-1) and remote duct
temperature sensor (TE-2) provide on-off control of the
3 stages electric heater bank to reheat the supply air.

The differential pressure switch (DPS-1) monitors the status of
filter, when the set point is exceeded, a signal will be given to
switch on 'filter change' indicating lamp on the control panel.
The smoke detector (SD-1) monitors the smoke status. Once
smoke is detected, the fan will be shut down.

4 of 30

AHU-3


ATC Application Handbook
Section 2
Issue Date 0500

AHU Control
Duct type 2-pipe cooling, electric heater & dehumidification

Equipment List
Instr. No.

Code No.


Description

TE-1

TS-9104-8220

Duct type temp. sensor

TC-1

TC-8903-1132-WK

12/28 C, PI analogue controller, remote sensor, 24V

TE-2

A99DY-200C

Duct temperature sensor

TS-1

A27A1N11

-40/40 C, din-railmount electronic thermostat, 24VAC

SM-1

S27A1


Din-railmount stage module,24VAC

HL-1

A25AN-9

Hi-limit cutout, manual reset, 237mm

FS-1

F62AA-8

Air flow switch

HE-1

HT-9000-1D1

Duct type humidity transmitter

HS-1

W27N11

10/90% din-railmount humidity controller,24VAC

SD-1

DH100ACDCP


Duct type smoke detector (Photo)

ST-3

Sampling Tube

DPS-1

P32AC-2

0/5" W.C. differential pressure switch

X-1

Y62HKL-40

Transformer, 40VA, 240/220/24V

TV-1

Refer to Valve Schedule (Section 3)

Valve & Valve Actuator with 24 VAC power supply

Note:
1. R: Relay contact interlock with blower.
2. Refer to DH100 wiring diagram for wiring the smoke detector.
(Attached at the end of this section)
3. If 3 way mixing valve instead of 2-way valve is used, the

wiring at terminals 2 & 3 of the actuator TV-1 should be
interchanged.
4. More stage modules can be connected to TS-1, for details,
please refer to system 27 catalogue.
5. The jumper setting for directed or reversed control in TS-1 ,
SM-1 and HS-1should be refer to installation sheet.

5 of 30

AHU-3


ATC Application Handbook
Section 2
Issue Date 0500

Bypass Valve Control

Equipment Wiring

Note:
1. R: Relay contact
interlock with system.

Operation Description
Differential pressure controller (DPC-1) connected to
sense the differential pressure between the system
water supply and return headers provides modulating
control for the two-way motorized valve (PV-1) which
bypass system water when necessary to maintain the

desired differential pressure between headers.

The motorized valve (PV-1) interlocks with the system, so that
when the system shut down, the motorized valve (PV-1) will
be driven to its closed position.

Equipment List
Instr. No.

Code No.

Description

DPC-1

P74JA-3

55/414 Kpa differential pressure controller

X-1

Y62HKL-40

Transformer, 40VA, 240/220/24V

TV-1

Refer to Valve Schedule (Secion 3)

Valve & Valve Actuator with 24 VAC power supply


6 of 30

BPC-1


ATC Application Handbook
Section 2
Issue Date 0500

Chiller Plant Control
2 Chiller Sets

Equipment Wiring

Note:
1. Contact Action: 1 to 2
closes on temperature
rise.

Operation Description
Two-step thermostat (TS-1) with its remote bulb
installed at the return main header of chilled water
system provides step control to the two chillers. When
the chilled water return tempeature is higher than the
set point, the leading chiler will be started. If the
temperature continues ot increase, the lagging chiller
will also be started.

Flow switches (FS-1, 2) installed downstream of each chiller

are provided for no-flow protection. The chillers can only be
started when their respective flow switches are activated.

Equipment List
Instr. No.

Code No.

Description

TS-1

A28AA-9007

-5/28 C, 2-stage remote bulb thermostat

WEL14A603R

Bulb Well

F61MB-1

Sea water flow switch

FS-1, 2

7 of 30

CPC-1



DDC-1

DAHU-1

Return air temperature

Fresh air temperature

Supply air temperature

Return air humidity

Fresh air humidity

Fan on/off status

Fan trip alarm

Filter clogged alarm

Damper modulating control

Fan Start/stop Control

Modulating control of cooling valve

ATC Application Handbook
Section 2
Issue Date 0500


DDC AHU Control
Free cooling application

Schematic Drawing

1
2
3
4
5
6

AI
7

BI
8
9

AO
10
11

x1

x1

x1


x1

x1

x1

x1

x1

x2

x1

x2

BO

DDC

8 of 30


ATC Application Handbook
Section 2
Issue Date 0500

DDC AHU Control
Free cooling application


Operation Description
For auto mode, direct digital controller, DDC (DDC-1)
provides time schedule for start/stop operation of AHU.

At free cooling operation, the motorized cooling valve (TV-1)
will be driven to fully closed position.

Duct type temperature sensor (TE-3) is installed to
sense the supply air temperature. Direct digital
controller, DDC (DDC-1) provides modulating (PI)
control for the motorized valve (TV-1), so as to maintain
the desired supply air temperature.

If the enthalpy of outdoor air is higher than that of return air or
outdoor air temperature is higher than the set point of supply
air temperature, the motorized return air damper (DA-1) will be
driven to maximum position, while the motorized outdoor air
damper (DA-2) will be driven to minimum position.

The supply air temperature set point is reset by the
return air temperature, sensed by duct type
temperature sensor (TE1), based on a reset schedule.

The controller interlocks with the supply fan status, so that on
fan shut down, the controller will be switched off, the cooling
valve will be driven to its closed position, and the dampers be
driven to fully closed position.

Duct type temperature sensors (TE-1, 2) and humidity
sensors (HE-1, 2) is installed to sense the return and

fresh air temperature and humidity. DDC calculates the
enthalpy values of return and fresh air based on the
sensed value, so as to provide free cooling control.

The differential pressure switch (DPS-1) monitors the status of
filter, when the set point is exceeded, a signal will be given to
DDC.

If the enthalpy of outdoor air is lower than that of return
air with a enthalpy differential and the outdoor air
temperature is lower than the supply air setpoint, the
motorized return air damper (DA-1) will be driven to
minimum opening, while the motorized outdoor air
damper (DA-2) will be driven to maximum opening.

Equipment List
Instr. No.

Code No.

Description

TE-1~3

TE-6311P-1

-46/104 C Duct temp. sensor

HE-1, 2


HT-9000-1D1

Duct type humidity transmitter

DPS-1

P32AC-2

0/5" W.C. differential pressure switch

DA-1, 2

M-9116-GGA-1

Modulating damper actuator, 0-10VDC 16Nm

DDC-1

DX-9100-8154

Extended Digital Controller

X-1

Y62HKL-40

Transformer, 40VA, 240/220/24V

TV-1


Refer to Valve Schedule (Section 3)

Valve & Valve Actuator with 24 VAC power supply

9 of 30

DAHU-1


DDC-1

DAHU-2

Return air temperature

CO2 Concentration

Fan on/off status

Fan trip status

Filter clogged alarm

Smoke detected alarm

Damper modulating control

Fan start/stop control

Modulating control of cooling valve


ATC Application Handbook
Section 2
Issue Date 0500

DDC AHU Control
Indoor air quality application

Schematic Drawing

1
2

AI
3
4
5

BI
6
7

AO
8
9

x1

x1


x1

x1

x1

x1

x2

x1

x2

BO

DDC

10 of 30


ATC Application Handbook
Section 2
Issue Date 0500

DDC AHU Control
Indoor air quality application

Operation Description
For auto mode, direct digital controller, DDC (DDC-1)

provides time schedule for start/stop operation of AHU.
Duct type temperature sensor (TE-1) is installed to
sense the return air temperature, DDC provides
modulating (PI) control for the motorized cooling valve
(TV-1) based on the sensed return temperature and set
point, so as to maintain the desired return air
temperature.
Duct type CO2 gas detector (CO-1) is installed to
monitor the CO2 gas concentration of return air. DDC
provides modulating (PI) control for the motorized
damper actuators (DA-1) based on the sensed gas
concentration and set point, so as to maintain the
desired return CO2 gas concentration.

DDC monitors the fan on/off status and trip alarm. The
motorized cooling valve and damper actuators interlock with
fan status. Both valve and damper will be fully closed when
the fan shut down.
The differential pressure switch (DPS-1) monitors the status of
filter, when the set point is exceeded, a signal will be given to
DDC.
The smoke detector (SD-1) monitors the smoke status. Once
smoke is detected, the fan will be shut down.

Equipment List

Instr. No.

Code No.


Description

TE-1

TE-6311P-1

-46/104 C Duct temp. sensor

CO-1

2001VT

CO2 Detector

SD-1

DH100ACDCP

Duct type smoke detector (Photo)

ST-3

Sampling Tube

DPS-1

P32AC-2

0/5" W.C. differential pressure switch


DA-1, 2

M-9116-AGA-1

Motorized damper actuator, 16Nm, 24V

DDC-1

DX-9100-8154

Extended Digital Controller

X-1

Y62HKL-40

Transformer, 40VA, 240/220/24V

TV-1

Refer to Valve Schedule (Section 3)

Valve & Valve Actuator with 24 VAC power supply

11 of 30

DAHU-2


DDC-1


Chilled water return temperature

Chilled water supply temperature

Chilled water flow rate

Differential pressure

Chiller on/off status

Chilled water pump on/off status

Chiller trip status

Chilled water pump trip status

Isolation valve open/close status

Chilled water flow status

Chiller start/stop control

Chilled water pump start/stop control

Isolation valve open/close control

Modulating control of bypass valve

ATC Application Handbook

Section 2
Issue Date 0500

DDC Chiller Plant Control

3 chillers and 4 chilled water pumps with bypass valve

Schematic Drawing

1
2
3

AI
4
5
6
7
8

BI
9
10
11
12
13
14

x1


x1

x1

x1

x3

x4

x3

x4

x3

x3

x3

x4

x3

x2

BO

DDC


12 of 30

DCPC-1


ATC Application Handbook
Section 2
Issue Date 0500

DDC Chiller Plant Control
3 chillers, 4 chilled water pumps with bypass valve

Operation Description
In auto mode, direct digital controller, DDC (DDC-1)
provides start/stop control for the chiller plant based on
time schedule.
The immersion temperature sensors (TE-1, 2) are
installed in the chilled water return and supply headers
to sense the chilled water return and supply
temperature and flow meter (FM-1) will be installed to
monitor the flow rate of return chilled water. The DDC
calculates the cooling load of the building based on the
sensed temperatures and flow rate. A chiller set will be
started, if the calculated cooling load is higher than set
point or the return chilled water temperature is higher
than the set point of chilled return temperature. A
chiller set will be stopped, if both the cooling load and
return chilled water temperature lower than the set
point with a differential.


DDC monitors the on/off status and trip alarm of all chillers
and chilled water pumps.
The priority to start a chiller and chilled water pump will based
on the total running time of each equipment, so as to maintain
the equal run time of each equipment.
Sequence of start a chiller:
1. Open the isolation valve;
2. Start chilled water pump;
3. Start chiller if the flow is proven.
Sequence of stop a chiller:
1. Stop chiller;
2. Stop chilled water pump;
3. Close the isolation valve.
Time delay are set for each step in the above sequencing.

DDC limits the maximum start/stop time of chiller and
chilled water pump in a pre-set time period and also the
minimum run time, so as to prevent cycling effect on
the equipment.
The water flow switches (FS-1~3) are installed to
monitor the flow status of chilled water. The chiller will
be started, if the flow is proven by the flow switch.

Differential pressure transmitter (DPT-1) is installed to sense
the differential pressure between the supply and return
headers. DDC provides modulating (PI) control for the
motorized bypass valve (PV-1) based on the sensed
differential pressure and set point, so as to maintain the
desired differential pressure.


Equipment List
Instr. No.

Code No.

Description

TE-1~2

TE-631AP-1

-46/104 C immersion temp. sensor

WZ-1000-5

Brass well

FM-1

-

Flow meter

FS-1~3

F61MB-1

Sea water flow switch

DPT-1


252C

0/60 psig pressure transmitter c/w P7002

TV-1~3

-

Isolation valve

DDC-1

DX-9100-8154

Extended Digital Controller

XT-9100-8304

Extension Module

XP-9103-8304

Expansion Module (8 DO)

XP-9105-8304

Expansion Module (8 DI)

X-1


Y62HKL-40

Transformer, 40VA, 240/220/24V

PV-1

Refer to Valve Schedule (Section 3)

Valve & Valve Actuator with 24 VAC power supply

13 of 30

DCPC-1


ATC Application Handbook
Section 2
Issue Date 0500

DDC FCU Control
Room sensor, 4-pipe cooling/heating

Equipment Wiring

Note:
1. K1: Relay interlock with system.
(Close = On, Open = Off)
2. If 3-way mixing valve instead of 2way valve is used, the wiring at
terminals 2 & 3 of the actuators (TV-1,

2) should be interchanged.

Operation Description
Room command module (TM-1) senses room
temperature and provides Off-Auto-High-Med-Low fan
speed control, set point dial and Comfort/ Standby
mode selection button.
Direct Digital Controller, DDC (TC-1) provides
modulating (PI) control for the motorized cooling valve
(TV-1) or heating valve (TV-2) based on sensed
temperature and set points, so as to maintain the
desired room temperature.

At auto fan speed, DDC controller (TC-1) provides High-MedLow fan speed for the fan based on the sensed temperature
and set points.
At comfort mode, the cooling and heating set points are +/- 1
deg C as set point dial. At standby mode, the set points are +/3 deg C as set point dial.
DDC controller (TC-1) monitors system on/off status (by relay
K1). Once system off, fan will be shut down and the two
motorized valves (TV-1, 2) will be driven to fully closed
position.

Equipment List

Instr. No.

Code No.

TC-1


TC-9102-0552

Description
DDC controller

TM-1

TM-9160-0002

12/28 C Room temperature sensor c/w 3 speed switch & occupancy button

X-1

Y62HKL-40

Transformer, 40VA, 240/220/24V

TV-1, 2

Refer to Valve Schedule (Section 3)

Valve & Valve Actuator with 24 VAC power supply

14 of 30

DFCU-1


ATC Application Handbook
Section 2

Issue Date 0500

DDC FCU Control
Room sensor, 2-pipe cooling, electric heater

Equipment Wiring

Note:
1. K1: Relay interlock with system.
(Close = On, Open = Off)

Operation Description
Room command module (TM-1) senses room
temperature and provides Off-Auto-High-Med-Low fan
speed control, set point dial and Comfort/ Standby
mode selection button.
Direct Digital Controller, DDC (TC-1) provides on/off
control for the motorized cooling valve (TV-1) or electric
heater based on sensed temperature and set points, so
as to maintain the desired room temperature.
A high limit cutout thermostat with manual reset (HL-1)
is installed to de-energise the electric heater in the
event of excessive high temperature built up in the
supply air duct.

At auto fan speed, DDC controller (TC-1) provides High-MedLow fan speed for the fan based on the sensed temperature
and set points.
At comfort mode, the cooling and heating set points are +/- 1
deg C as set point dial. At standby mode, the set points are +/3 deg C as set point dial.
DDC controller (TC-1) monitors system on/off status (by relay

K1). Once system off, fan will be shut down and the motorized
valve (TV-1) will be driven to fully closed position and electric
heater will be switched off.

Equipment List

Instr. No.

Code No.

Description

TC-1

TC-9102-0662

DDC controller

TM-1

TM-9160-0002

12/28 C Room temperature sensor c/w 3 speed switch & occupancy button

HL-1

A250HK-1

Hi-limit cutout, manual reset, 280mm


X-1

Y62HKL-40

Transformer, 40VA, 240/220/24V

TV-1

Refer to Valve Schedule (Section 3)

On/off Valve with spring return, 220 VAC power supply
15 of 30

DFCU-2


ATC Application Handbook
Section 2
Issue Date 0500

DDC FCU Control
Duct sensor, 2-pipe cooling, electric heater

Equipment Wiring

Note:
1. K1: Relay interlock with system.
(Close = On, Open = Off)

Operation Description

Room command module (TM-1) provides Off-AutoHigh-Med-Low fan speed control, set point dial and
Comfort/ Standby mode selection button.

At auto fan speed, DDC controller (TC-1) provides High-MedLow fan speed for the fan based on the sensed temperature
and set points.

Direct Digital Controller, DDC (TC-1) together with duct
type temperature sensor (TE-1) senses return air
temperature and provides on/off control for the
motorized cooling valve (TV-1) or electric heater based
on sensed temperature and set points, so as to
maintain the desired return air temperature.

At comfort mode, the cooling and heating set points are +/- 1
deg C as set point dial. At standby mode, the set points are +/3 deg C as set point dial.

A high limit cutout thermostat with manual reset (HL-1)
is installed to de-energise the electric heater in the
event of excessive high temperature built up in the
supply air duct.

DDC controller (TC-1) monitors system on/off status (by relay
K1). Once system off, fan will be shut down and the motorized
valve (TV-1) will be driven to fully closed position and electric
heater will be switched off.

Equipment List
Instr. No.

Code No.


Description

TE-1

TS-9103-8220

Duct type temp. sensor

TC-1

TC-9102-0662

DDC controller

TM-1

TM-9170-0002

Room command module c/w 3 speed switch

HL-1

A250HK-1

Hi-limit cutout, manual reset, 280mm

X-1

Y62HKL-40


Transformer, 40VA, 240/220/24V

TV-1

Refer to Valve Schedule (Section 3)

Valve & Valve Actuator with 24 VAC power supply
16 of 30

DFCU-3


ATC Application Handbook
Section 2
Issue Date 0500

DDC FCU Control
Room sensor, 2-pipe cooling, electric heater with LCD display

Equipment Wiring

Note:
1. K1: Relay interlock with system.
(Close = On, Open = Off)
2. If 3-way mixing valve instead of 2way valve is used, the wiring at
terminals 2 & 3 of the actuator (TV-1,)
should be interchanged.
3. The JP3 in TC-1 shall be
configured as follow:


Operation Description
Room command module (TM-1) with LCD display
senses room temperature and provides Off-Auto-HighMed-Low fan speed control, set point dial and
Comfort-Standby mode selection button.
Direct Digital Controller, DDC (TC-1) provides on/off
control for the motorized cooling valve (TV-1) or electric
heater based on sensed temperature and set points, so
as to maintain the desired room temperature.

At auto fan speed, DDC controller (TC-1) provides High-MedLow fan speed for the fan based on the sensed temperature
and set points.
At comfort mode, the cooling and heating set points are +/- 1
deg C as set point dial. At standby mode, the set points are +/3 deg C as set point dial.
DDC controller (TC-1) monitors system on/off status (by relay
K1). Once system off, fan will be shut down and the motorized
valve (TV-1) will be driven to fully closed position and the
electric heater will be switched off.

Equipment List
Instr. No.

Code No.

Description

TC-1

TC-9102-0662


DDC controller

TM-1

TM-9180-0110

12/28 C Room temperature sensor c/w 3 speed switch, LCD display and occupany button

HL-1

A250HK-1

Hi-limit cutout, manual reset, 280mm

X-1

Y62HKL-40

Transformer, 40VA, 240/220/24V

TV-1

Refer to Valve Schedule (Section 3)

Valve & Valve Actuator with 24 VAC power supply
17 of 30

DFCU-4



ATC Application Handbook
Section 2
Issue Date 0500

DH100 Wiring Diagram
Equipment Wiring

TEST
POSITION

Notes
1.

In normal condition, A-B is closed circuit to make fan(s) operating.

2.

If an alarm is detected, alarm contacts will change from N.C. (Terminals 16 &
6) to N.O. (Terminals 6 & 17), and this will result in breaking the circuit of A-B.

3.

Trouble contact (Terminal 3 & 14) will open when plate of detector or power is
removed. A-B will open and the fan(s) will be stopped.

4.

The detector can be tested by placing a magnet at test position.

5.


The detector can be resumed to normal condition by pushing the reset button.

6.

Relay R should be 24 VDC and provided by others.

18 of 30

DH100


ATC Application Handbook
Section 2
Issue Date 0500

DDC PAU Control
Duct type 2-pipe cooling only

Equipment Wiring

Note:
1. K1: Relay interlock with fan starter.
(Close = On, Open = Off)
2. Refer to DH100 wiring diagram for
wiring the smoke detector. (Attached
at the end of this section)
3. If 3-way mixing valve instead of 2way valve is used, the wiring at
terminals 2 & 3 of the actuator (TV-1)
should be interchanged.


Operation Description
Duct type temperature sensor (TE-1) is installed to
sense the supply air temperature. Easy Direct Digital
Controller, DDC (SC-1) provides modulating (PI)
control for the motorized valve (TV-1), so as to maintain
the desired supply air temperature.
The smoke detector (SD-1) monitors the smoke status.
Once smoke is detected, the fan will be shut down.

The differential pressure switch (DPS-1) monitors the status of
filter, when the set point is exceeded, a signal will be given to
switch on 'filter change' indicating lamp on the control panel.
Easy DDC (SC-1) monitors the fan on/off status. Once fan
shut down, the motorized valve (TV-1) will be driven to fully
closed position.

Equipment List

Instr. No.

Code No.

Description

TE-1

TS-9103-8220

Duct type temp. sensor


SC-1

SC-9100

DDC controller c/w digital display

DPS-1

P32AC-2

0/5" W.C. differential pressure switch

SD-1

DH100ACDCP

Duct type smoke detector (Photo)

ST-3

Sampling Tube

X-1

Y62HKL-40

Transformer, 40VA, 240/220/24V

TV-1


Refer to Valve Schedule (Section 3)

Valve & Valve Actuator with 24 VAC power supply
19 of 30

DPAU-1


ATC Application Handbook
Section 2
Issue Date 0500

FCU Control
Duct type 2-pipe cooling only

Equipment Wiring

Note:
1. R: Relay contact interlock with
blower.

Operation Description
Duct type thermostat (TS-1) located in the return air
duct will provide two-position control for the motorized
valve (TV-1), so as to maintain the desired return air
temperature.

When the fan is switched off, the motorized valve (TV-1) will
return to its normally-closed position.


Equipment List

Instr. No.

Code No.

Description

TS-1

A19AAF-44

5/30 C, single stage duct type thermostat

TV-1

Refer to Valve Schedule (Section 3)

On/off Valve with spring return, 220 VAC power supply

20 of 30

FCU-D1


ATC Application Handbook
Section 2
Issue Date 0500


FCU Control
Duct type 2-pipe cooling only with 3-speed switch

Equipment Wiring

Operation Description
Duct type thermostat (TS-1) located in the return air
duct will provide two-position control for the motorized
valve (TV-1), so as to maintain the desired return air
temperature.

The manual switches (S-1) provide High-Med-Low fan speed
and system on-off switching. With the switch in 'off' position.
The motorized valve (TV-1) will return to its normally-closed
position and the fan will be switched off.

Equipment List

Instr. No.

Code No.

Description

TS-1

A19AAF-44

5/30 C, single stage duct type thermostat


S-1

Y621

Fan speed switch assembly (white) On-Off/Hi-Med-Low

TV-1

Refer to Valve Schedule (Section 3)

On/off Valve with spring return, 220 VAC power supply

21 of 30

FCU-D2


ATC Application Handbook
Section 2
Issue Date 0500

FCU Control
Duct type 2-pipe cooling, electric heater with 3-speed switch

Equipment Wiring

Operation Description
Duct type thermostat (TS-1) located in the return air
duct will provide two-position control for the motorized
valve (TV-1), so as to maintain the desired return air

temperature.

With the system selector switch in 'Heat' position, the cooling
controlled valve will be at its normally-closed position and the
duct type thermostat is controlling the electric duct heater to
maintain the desired return air temperature.

The switch (S-1) provides High-Med-Low fan speed
and system switching. With the system selector switch
in 'cool' position. The electric duct heater will be cut off
and the duct type thermostat is controlling the cooling
valve to maintain the desired return air temperature.

With the switch in 'Off' position, the motorized valve will return
to its normally-closed position and both the electric duct heater
and fan will be switched off.
A high limit cutout thermostat with manual reset type (HL-1) is
installed to de-energize the electric duct heater in the event of
excessive high temperature built up in the supply air duct.

Equipment List

Instr. No.

Code No.

Description

TS-1


A19AAF-44

5/30 C, single stage duct type thermostat

S-1

Y622

Fan speed switch assembly (white) Heat-Off-Cool/Hi-Med-Low

HL-1

A25AN-9

Hi-limit cutout, manual reset, 237mm

TV-1

Refer to Valve Schedule (Section 3)

On/off Valve with spring return, 220 VAC power supply
22 of 30

FCU-D3


ATC Application Handbook
Section 2
Issue Date 0500


FCU Control
Duct type 4-pipe cooling, heating with 3-speed switch

Equipment Wiring

Operation Description
Duct type thermostat (TS-1) located in the return air
duct will provide two-position control for the motorized
cooling valve (TV-1) or heating valve (TV-2), so as to
maintain the desired return air temperature.

With the system selector switch in 'Heat' position, the cooling
controlled valve will be at its normally-closed position and the
duct type thermostat is controlling the heating controlled valve
to maintain the desired return air temperature.

The switch (S-1) provides High-Med-Low fan speed
and system switching. With the system selector switch
in 'cool' position. The heating control valve will be at its
normally-closed position and the duct type thermostat
is controlling the cooling valve to maintain the desired
return air temperature.

With the switch in 'Off' position, the motorized valve will return
to its normally-closed position and both the electric duct heater
and fan will be switched off.

Equipment List
Instr. No.


Code No.

Description

TS-1

A19AAF-44

5/30 C, single stage duct type thermostat

S-1

Y622

Fan speed switch assembly (white) Heat-Off-Cool/Hi-Med-Low

TV-1, 2

Refer to Valve Schedule (Section 3)

On/off Valve with spring return, 220 VAC power supply

23 of 30

FCU-D4


ATC Application Handbook
Section 2
Issue Date 0500


FCU Control
Room type, 2-pipe cooling with 3-speed switch

Equipment Wiring

Operation Description
Room thermostat (TS-1) [or digital thermostat (TS-1) ]
located in the controlled space will provide two-position
control for the motorized valve (TV-1), so as to maintain
the desired room temperature.

The Integral switches provide High-Med-Low fan speed and
system switching. With the switch in 'Off' position, cooling
valve (TV-1) will return to its normally-closed position and the
fan will be switched off.

Equipment List
Instr. No.

Code No.

Description

TS-1

T2000EAC-0

Fan coil cooling thermostat+cover+fan speed switch


TS-2

T2000EAD-0

Digital thermostat, on/off type c/w 3 speed switch

TV-1

Refer to Valve Schedule (Secion 3)

On/off Valve with spring return, 220 VAC power supply

24 of 30

FCU-R1


ATC Application Handbook
Section 2
Issue Date 0500

FCU Control
Room type, 2-pipe cooling, electrical heater with 3-speed switch

Equipment Wiring

Operation Description
Room thermostat (TS-1) [or digital room thermostat
(TS-2) ] located in the controlled space will provide 2position control for the motorized valve (TV-1) or
electric duct heater, so as to maintain the desired room

temperature.
The integral switches provide High-Med-Low fan speed
and system switching. With the system selector switch
in 'Cool' position, the electric duct heater will be cut off
and the room thermostat is controlling the cooling valve
to maintain the desired room temperature.

With the system selector switch in 'Heat' position, the cooling
controlled valve will be at its normally-closed position and the
room thermostat is controlling the electric duct heater to
maintain the desired room temperature.
With the switch in 'Off' position, the motorized valve will return
to its normally-closed and both the electric duct heater and fan
will be switched off.
A high limit cutout thermostat with manual reset type (HL-1) is
installed to de-energise the electric duct heater in the event of
excessive high temperature built up in the supply air duct.

Equipment List

Instr. No.

Code No.

Description

TS-1

T2000AAC-0


Fan coil cooling/heating therm+cover+fan speed switch

TS-2

T2000AAD-0

Digital thermostat, heat-off-cool type c/w 3 speed switch

HL-1

A25AN-9

Hi-limit cutout, manual reset, 237mm

TV-1

Refer to Valve Schedule (Section 3)

On/off Valve with spring return, 220 VAC power supply
25 of 30

FCU-R2