GAS FURNACE
Page 34
505023M 08/11
Gas Heating Checkout (Multiple Zone)
Prerequisites:
S
All zone thermostats set to Heat
OUTPUT STATUS LEDs
DAMPER 2,3,4 OFF
W1 ON
(W) RED ON
HEATING ON
FAN ON
1. Set all zone thermostats for a heat demand; check for
the following:
D All zone thermostat W LEDs on (heat demands).
D LEDs dampers 1 − 4 off (all dampers open).
D Output Heat W1 LED on (furnace on).
D Heating LED on.
The furnace begins ignition sequence after a heat de-
mand is detected. The zone control system will start
the furnace blower on low speed (0 PIAB) 45 seconds
after the combustion cycle has begun.
2. When 100ºF warm air is sensed by the discharge air
sensor, the fan LED comes on and the blower will
slowly increase to speed required by the zones calling.
The blower operates at a speed equivalent to the sum
of all zone PIAB jumpers but at a maximum not to ex-
ceed the setting of the heating air reduction jumper. It
may take the blower 60 to 90 seconds to reach this
speed.
3. Set all zone thermostats for NO heat demands; check:
D Output Heat W1 LED off.
D Heating LED off.
D Fan LED off (blower turns off after delay).
D All zone thermostat W LEDs off.
D DamperLEDs − Last zone thermostat demand re-
moved: LED is off (this zone’s damper remains
open during 3−1/2 minutepurge); other zones
damper LEDs are on during the 3−1/2 minute
purge (dampers closed). After 3−1/2 minute delay,
all dampers LEDs go off (dampers open).
Gas Heating Checkout (Central Control)
Prerequisites:
S
Central mode switch on
S Red LED on the central mode fan switch on
OUTPUT STATUS LEDs
W1 ON
(W) RED ON
DAMPER 2,3,4 OFF
HEATING ON
FAN ON
CENTRAL
MODE ON
1. Set zone 1 thermostat for a heat demand; check:
D Zone 1 thermostat W LED on (heating demand).
D Output Heat W1 LED on (furnace on).
D Heating LED on.
D All damper LEDs off (damper open).
2. The furnace will begin its ignition sequence after Zone
1 has demanded heat. The zone control system will
start the furnace blower on low speed (0 PIAB air) 45
seconds after the combustion cycle has begun.
3. When 100ºF warm air is sensed by the discharge air
sensor, the fan LED will light and the blower will slowly
increase to speed. The blower will operate at a speed
equivalent to the PIAB calculated for all zones calling,
taking into account the heating air reduction jumper
position. It may take the blower 60 to 90 seconds to
reach this speed.
4. Remove the heat demand from zone 1 (no heat input
or output and no blower demand). Upon removal of the
demand from zone 1, check:
D Zone 1 thermostat W LED off (no heat demand).
D Output Heat W1 LED off.
D Fan LED off.
D Heating LED off.
After 3−1/2 minute purge time, furnace blower turns off.
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