DUAL FUEL
Page 46
505023M 08/11
Dual Fuel Gas Heating Checkout (Central Control)
Prerequisites:
S
Central mode switch on.
S Red LED on the central mode fan switch on.
S Zone 1 thermostat set to Heat.
S Balance Point Sensor set at higher temperature than outdoor
BPS-sensed temperature (red balance point sensor LED
on).
OR
S Balance Point Sensor inputs jumpered to simulate cold out-
door temperature below balance point (red balance point
sensor LED on).
OUTPUT STATUS LEDs
W1 ON
(W) RED ON
DAMPER 2,3,4 OFF
HEATING ONFAN 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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