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Circuit board, Qtd series – Detroit Radiant Products Company QTD Series User Manual

Page 32

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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