Specifications

31
6.7 Mechanical Draft System for a Gas-red
Fireplace with multiple ues with Safety
System per NFPA54/IFGC
Application
This is used in the same situations as System 5,
but where multiple fans are required to handle the
exhaust volume. It is a typical installation for large
replaces where a single ue cannot handle the
amount of exhaust gases generated.
This is a simple form of installation when used with
a gas-red replace. The set-up can be used with
virtually any type of gas-red heating appliance.
*For one fan serving two ues please refer to section
6.5 as the wiring diagram is identical. A special
plenum box may be required.
Sequence of Operation
1. Turn the fan speed control on by turning the
knob clockwise. A “click” indicates the control
is turned on. Adjust the knob to the desired
speed.
2. Start the re by pushing the igniter or other
means used to start the re.
3. Fine-tune the fan speed setting so spillage from
the replace opening can not be detected.
Hot, moist heat rising from the top of the replace
is an indication of spillage. For better detection,
hold a mirror over the replace opening
4. In case of mechanical or electrical fan failure, the
proven draft switch will disconnect the ow of fuel
to the replace or the gas logs.
5. Once the proper draft has been established in
the chimney, the proven draft switch will close to
allow the ow of fuel.
6. When the fan is turned off, the proven draft switch
will open and automatically turn off the ow of
gas.
+/
_
FSC
Fan Speed Control
Chimney
Fans
Chimney
Probe
Chimney
Probe
PDS
Proven Draft
Switch
RED WHITE BLACK GREEN
FAN
MOTOR
120/1/60
NOTES:
THE DISCONNECT MEANS AND CIRCUIT PROTECTION ARE TO
BE PROVIDED BY THE INSTALLER OF THIS DEVICE
1
2
All wiring must be in
flexible or rigid metal
conduit
LEGEND:
24 VAc
120 VAC
WEATHERPROOF BOX
N
FAN SPEED
CONTROL
ORANGE
RED WHITE BLACK GREEN
FAN
MOTOR
WEATHERPROOF BOX
ORANGE
WEATHERPROOF
BOX
L
24V GAS VALVE
COM
TR
HOT
TH
PROVEN DRAFT
SWITCH
24 VAC
System 7
Gas-Fired Fireplace