Electrical Wiring; General Requirements; Wiring Diagram - Berner GR Series Operating And Service Instructions

General Requirements

Heaters are normally controlled with the thermostat that is included with your equipment. A 24V signal is
supplied by the heater control module for thermostat connection. Refer to wiring diagram, Figure 16. A
bulkhead fitting in the back panel of the control box is provided for the appropriate wire. In all cases,
heaters must be grounded in accordance with the National Electric Code, ANSI/NFPA 70 in the USA, and
the Canadian Electric Code, CSA C22.1 in Canada, and must comply with all local requirements.
If any of the original wire as supplied with the heater must be replaced, it must be replaced with wiring
having a rating of at least 105°C temperature service and 600 volts capability.

WIRING DIAGRAM

FENWALL DSI
FENWALL DSI
HV
FENWALL DSI
HV
Series GR
MODEL RE
GAS VALVE
Yellow
TH
AIR
SWITCH
Red
PSW
V1
BLOWER
Black
IND
Black
Black
L1
Blue
24V
V2
Green
GND
S1
Pink
GAS VALVE
Yellow
TH
AIR
SWITCH
Red
PSW
V1
BLOWER
Black
IND
Black
Black
L1
Blue
24V
V2
Green
GND
S1
Pink
Figure 16: Internal Wiring
24 Vac Thermostat
THERMOSTAT IS
MOUNTED EXTERNALLY
Brown
24V STAT
Purple Blue
Blue
Purple
Red
L1
TRANSFORMER 120V
24V
NEUTRAL
Yellow
SENSOR
IGNITER
BURNER
120 Vac Thermostat
Brown
Purple Blue
Blue
Purple
Red
L1
TRANSFORMER 120V
24V
NEUTRAL
Yellow
NOTE: The post purge feature is
SENSOR
not utilized with the thermostat
wired on the 120 Vac circuit. This
option only works if the heater is
wired with the thermostat on the
IGNITER
BURNER
24 Vac circuit above.
Page 19

Electrical Wiring

THERMOSTAT IS
MOUNTED EXTERNALLY
120 Vac STAT
When connecting 120 VAC stat
the two blue wires used for the 24
Vac stat must be connected
internally.
February 10, 2014