Vent Safety Switch; Electrical Connection - Majestic fireplaces NVC36 Installation And Homeowners Operating Instructions

Majestic Fireplaces

Vent Safety Switch

This fireplace incorporates the use of a Vent Safety
Shut-off Switch. The sensor and wiring are factory
installed and should not be removed or altered during
installation.
In the event of total flue blockage the system will detect
the increased heat buildup and will automatically shut
down the main burner assembly.
The sensor is located above the firebox behind the top
louvre assembly. It is accessible by removing the top
louvre assembly.
CAUTION: The firebox, Vent Safety Switch sensor
and surrounding panels become very hot during
normal operation. Allow time for the components to
cool before carrying out any service or inspection.
If the sensor is activated and shuts off the burner
assembly, the following procedure should be followed:
•
Observe that the pilot flame is still ON. If the pilot
flame has gone out the reason for the fireplace shut
down is not the vent safety switch.
•
Turn the pilot flame OFF and close all controls. Allow
the fireplace to cool.
•
Check the flue and venting components for blockage
or restrictions.
•
Remove the front louvre assembly.
•
Locate the sensor.
•
Reset the sensor by pressing the reset pin between
the two wire terminals. (Fig. 18)
CAUTION: The components may still be hot.
•
Light the fireplace and check for downdrafts.
•
Operate the fireplace in the normal manner. If the
burner assembly shuts down again after a period of
operation, DO NOT ATTEMPT TO RESET THE
SENSOR AGAIN. Turn off the fireplace and contact
your service technician.
Sensor
Wire
Terminal
Reset Pin
Fig. 18 Vent Safety Switch.
14
NVC Series B-Vent
®
Wire
Terminal
FP1160

Electrical Connection

The sensor is wired in series between the wall mounted
ON/OFF switch and the Electronic Ignition Module (Fig.
19) or the thermopile and the gas valve (Fig. 20)
PILOT
HONEYWELL S8600 B IGNITION MODULE
GND
24V
MV MVPV PV
(BURNER)
GND
WHITE
BLACK
BLACK
WHITE
NOVA SIT 822 VALVE
120 VAC RTN 24 VAC HOT
BLACK
WHITE
WHITE
BLACK
120 VAC HOT 24 VAC RTN
40VA
GREEN
TRANSFORMER
Fig. 19 Vent Safety Switch wiring, EN/EP units.
OnN/OFF
Switch
Vent
Safety
Switch
Fig. 20 RN/RP units using a remote ON/OFF switch.
WHITE
24V SENSE SPARK
WHITE
BLACK
BLACK
BLACK
WHITE
ON-OFF
SWITCH
FP670
Thermopile
TH
Gas
TP
Valve
TH
TP
FP1161
20000194