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3.4.2.3. Typical Gas Heating Checkout (Central Mode)
Prerequisites:
• Central mode switch on
• Red LED on the central mode fan switch on.
OUTPUT STATUS LEDs
(W) RED ON
DAMPER 2,3,4 OFF
HEATING ON
FAN ON
CENTRAL
MODE ON
W1 ON
1. Set zone 1 thermostat for a heat demand; check:
• Zone 1 thermostat W LED on (heating demand).
• Output Heat Y1 LED on (furnace on).
• Heating LED on.
• All damper LEDs off (dampers 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:
• Zone 1 thermostat W LED off (no heat demand).
• Output Heat W1 LED off.
• Fan and Heating LEDs off.
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