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Andrews FASTflo WH42 Installation Manual, Operation And Maintenance Manual Page 27

Continuous flow wall hung balanced flue heaters for natural gas and lpg.
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Wiring Diagram ( WH42, LWH42, WH56, LWH56)
AIRFLOW CHANGE
2
2
O
-OVER CONNECTOR
O
1
1
O
1
(VACANT CONNECTOR)
2
3
4
5
6
R
7
R
INLET WATER
3
W
W
2
THERMISTOR
W
1
W
HEAT EXCHANGER
W
W
4
W
THERMISTOR
3
2
W
1
W
OUTLET WATER
W
W
2
W
THERMISTOR
1
W
W
OPERATING LED
BK
2
BK
1
W
W
8
BK
BK
7
V
V
MAIN WATER
SM
(VCC)
W
6
W
5
FLOW CONTROL
G
G
4
O
O
VALVE
(VCC)
R
3
R
(Fully open)
2
Y
Y
LS
(GND)
BL
1
BL
8
BK
BK
7
V
V
SM
(VCC)
W
6
W
BYPASS WATER
5
G
G
FLOW CONTROL
O
4
O
(VCC)
3
R
R
VALVE
(Fully open)
2
Y
Y
LS
(GND)
BL
1
BL
BL
1
R
BL
THERMAL FUSE
BL
1
BL
REMOTE CONTROLLER
BL
2
BL
BL
1
BL
RC TERMINAL
1
R
SYSTEM CONTROLLER
B5
2
BK
(OPTIONAL)
FLAME ROD
W (Vs)
W
W
6
5
BL(GND)
BL
BL
4
FAN MOTOR
FM
R (Vcc)
R
3
R
Y (FG)
Y
2
Y
O (Vsp)
O
1
O
IGNITER
W
ELECTRODE
IG
BK
HIGH-LIMIT SWITCH
W
BK
2
W
1
W
1
BR
(VACANT CONNECTOR)
2
BR
BR
1 1
GY
(UN-USED)
2 2
BR
CURRENT LEAKAGE
SAFETY DEVICE
(GFCI)
<AC230V>
BR
BR
BR
1
BL
BL
2
W
BL
Y/G
Y/G
Y/G
BL
EARTH
EARTH
EARTH
BL
FREEZE PROTECTION
THERMOSTAT
W
FREEZE PROTECTION
BL
THERMOSTAT
BL
BR
BR
W 1
R
(UN-USED)
2
3
BL
(VACANT CONNECTOR)
2
R
1
BL
<CN102>
<CN89>
1 2 3 4
3
BL
2
1
BL
<CN38>
2
1
4
3
6
5
8
7
10
9
12 11
14 13
16 15
18 17
20 19
22 21
24 23
R
26 25
R
28 27
30 29
BL
32 31
1
<CN78>
1 3 5
<CN1>
2 4 6
<CN160>
BL
R
<CN102>
3
2
4
3
2
1
BK
R
G
G
EARTH
TRANSFORMER
(VACANT CONNECTOR)
BR
BR
1
3
GY
2
GY
BL
2
BL
BL
BL
3
W
1
W
BL/W
W
W W
W
W
W
W
W
W
1 2
2
1
2 1
2
1
2
1
W
W
W W
W
W
W
W
W
W
FREEZE PREVENTION HEATER
Page 23
BL
15
<CN63>
14
5 6
5 6
8 9
13
1 2 3 4
7
12
11
MAIN CIRCUIT
10
BOARD
9
8
7
6
5
4
Manifold Gas Pressure
3
2
Increase Button
1
R
Manifold Gas Pressure
<CN75>
Decrease Button
Minimum Manifold Pressure Set Button
Maximum Manifold Pressure Set Button
(For Quick Connect Multi System Only)
BL
BL
6
6
6
5
BL
BL
5
5
G
G
4
G(BK)
4
4
W
W
3
W(R)
3
3
2
BK
BK
BK(G)
2
2
R
R
1
R(W)
1
1
<CN184>
BL
8
7
R
O
6
BL
5
BR
4
GY
3
1
2
3
4
<CN10>
W
2
5
6
7
8
BK
1
O
Y
W
<CN27>
5
4
3
2
1
9
7
6
5
4
3
2
1
1
7
<CN
<CN104>
6
5
89A>
4
3
2
1
BK
W
2
1
<CN101>
LIVE
<CN92>
1
POWER CIRCUIT
2
BOARD
3
DC140V
W
W
6
5
BL
BL
4
R
3
R
Y
2
Y
O
1
O
DC15V(1)
BK
BK
W
15V POWER CIRCUIT
2 1
GND
COLOR CODING
W : White
R : Red
BK : Black
V : Violet
O : Orange
BL : Blue
GY : Gray
G : Green
BR : Brown
Y : Yellow
05.9.26, 7:41 PM
1
R
R
2
BURNER THERMISTOR
W
3
W
Y
3
Y
(Pulse)
MAIN WATER
2
R
R
(VCC)
QS
1
(GND)
BL
BL
FLOW SENSOR
R
3
(Pulse)
Y
Y
BYPASS WATER FLOW
R
2
R
(VCC)
QS
BL
1
BL
(GND)
SENSOR
BL
Other Unit in Quick Connect Multi System
MAIN CIRCUIT
BOARD
BL
BL
6
6
BL
BL
5
5
G
G
4
4
184
W
W
3
3
BK
BK
2
2
R
R
1
1
<CN184>
Quick Connect Cord(Optional)
BL
BL
6
BL
BL
5
(G)BK
4
(W)R
3
2
(BK)G
(R)W
1
BL
BL
DU
GAS VALVE UNIT
R
R
O
BL
BR
W
SV
GY
10
0
W
W
BK
BK
SV
11
Q1
GAS MANIFOLD
BK
GY
SV
12
Q2
GY
O
SV
13
Q3
O
BR
SV
14
Q4
BR
NEUTRAL
VARISTOR
VARISTOR
ARRESTER
CURRENT LEAKAGE SAFETY DEVICE
FREEZE PROTECTION
FREEZE PREVENTION
THERMOSTAT
HEATER
AC230V
PRIMARY
SECONDARY
10A(FUSE)
AC100V
RELAY 9
IGNITER
IG
RELAY 3
SOLENOID VALVE 0
SV0
HIGH LIMIT
RELAY 1
SOLENOID VALVE Q1
SV1
SWITCH
RELAY 10
RELAY 4
SOLENOID VALVE Q2
DC90V
SV2
DC90V
RELAY 5
SOLENOID VALVE Q3
SV3
RELAY 2
SOLENOID VALVE Q4
SV4
DC140V
POWER
FAN
FAN MOTOR
CONTROLLER
A
B
DC15V(2)
PRIMARY
FAN CONTROL
FAN
OUTPUT
PULSE
SECONDARY
A
CONTROL
CIRCUIT
FAN ROTATION
SPEED INPUT
B
MAIN WATER FLOW SENSOR
BYPASS WATER FLOW SENSOR
Sub-CPU
SUB
CONTROL
MAIN WATER FLOW CONTROL VALVE
UNIT
BYPASS WATER FLOW CONTROL VALVE
CPU
C
D
CENTRAL
PROCESSING
OUTLET WATER THERMISTOR
THERMAL FUSE
RELAY 1
UNIT
INLET WATER THERMISTOR
RELAY 2
HEAT EXCHANGER
THERMISTOR
RELAY
FREEZE PROTECTION
RELAY 5
DRIVING
THERMISTOR
CIRCUIT
RELAY 7
BURNER THERMISTOR
RELAY 9
RELAY 10
DU
D
GAS PROPORTION VALVE
POWER CONTROL CIRCUIT
FLAME DETECTING CIRCUIT
EARTH
FR
FLAME ROD
C
5V POWER CIRCUIT
EARTH
GND
23

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Fastflo lwh42Fastflo wh56Fastflo lwh56

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