Circuit board, Qtd series – Detroit Radiant Products Company QTD Series User Manual
Page 32
QTD
Series
32
3.0
Installation
•
Electrical Requirements
•
Internal Wiring Diagrams
Before field wiring this appliance - Check existing wiring; replace if necessary.
NOTE: If any of the original wire supplied with the appliance must be replaced, it must be replaced with
wiring material having a temperature rating of at least 105° C.
Figure 3.23 • Internal Block Wiring Diagram
DPDT SWITCH
(24V I/O)
120V/24V
TRANSFORMER
LINE VOLTAGE
120VAC 60Hz
POST-PURGE
TIMER
BLOWER
MOTOR
NEUTRAL
FAN
RELAY
DUAL POLE
RELAY
24VAC
CONTROL WIRES
PRESSURE
SWITCH
TWO-STAGE
GAS VALVE
FLAME SENSOR &
SPARK IGNITOR
FLAME SENSOR &
SPARK IGNITOR
HIGH-FIRE
RELAY
HIGH
FIRE
LOW
FIRE
V1
V2
NC
W (24V IN)
S1
S2
(24V IN) R
GND
GND
CIRCUIT BOARD
DIAGNOSTIC
LIGHT
1
2
3
4
R
BL
O
O
PR
PR
O
BL
BK
BK
BK
W
O
Y
O
BL
Y
BL
O
Y
GY
BK
BK
BL
BL
R
BK
W
BK
G
Y
Y
Y
13
11
12
26
24
25