Specifications

34
6.10 Mechanical Draft System (automated) for
a Gas-Fired Fireplace with Modulating
Fan Speed and a Single Flue with Safety
System per NFPA54/IFGC
Application
This is the most automated type of installation for
a gas replace application. The ADC150 control
monitors both operation and the safety system.
No adjustments are necessary after the system is
installed and commissioned. The ADC150 does not
have to be visible and can be installed in the attic.
XTP2 Pressure Transducer is part of ADC150 control.
Sequence of Operation
1. During commissioning, the fan speed is set using
the potentiometer located on the ADC150 control
board.
2. When the gas igniter is activated, the fan speed
increases. Once the proven draft switch closes, the
fan returns to the speed setting of the potentiometer
and the ADC150 releases the gas valve
3. If proper draft is not maintained, the ADC150
will increase fan speed gradually until the
XTP2 closes. If the XTP2 has not closed 10 seconds
after the fan reaches 100% speed, the ADC150 will
shut off the gas valve and go into alarm mode. If the
XTP2 closes while in alarm mode, the fan will resume
the original speed setting.
4. Once the replace is turned off, the fan will
continue to operate for a set post-purge time
(adjustable between 0-10 minutes) to remove any
remaining products of combustion before shutting
down.
5. In case of a mechanical or electrical failure the
ADC150 will shut off the gas valve.
System 10
ADC150
+/-
MFD Automated
Damper
ADC150
+/-
XTP2
Pressure Switch
XTP2
Pressure Switch
Gas-Fired Fireplace
RED ORANGE 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
All wiring must be in
flexible or rigid metal
conduit
LEGEND:
24 VAC
120 VAC
N
L
FAN CONTROL UNIT
7 8 9 10 11 12 13 14 15 16 17 18 19
1 2 3 4 5 6
WEATHERPROOF BOX
MAIN CONTROL UNIT
6 5 4 3 2 1
All wiring must be in
metal conduit or
shielded cable