Specifications

35
Gas-Fired Fireplace
6.11 Mechanical Draft System for a Gas-Fired
Fireplace with Modulating Fan Speed,
Damper and a Single Flue with Safety
System per NFPA54/IFGC
Application
This installation shows a combination replace
and damper system. The ADC150 control monitors
fan and damper 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 and the damper begins to open. Once
the damper is fully open and 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. The damper closes 10 seconds after the
fan is shut off.
5. In case of a mechanical or electrical failure the
ADC150 will shut off the gas valve.
System 11
ADC150
+/-
MFD Automated
Damper
ADC150
+/-
XTP2
Pressure Switch
XTP2
Pressure Switch
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