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3.4.2.2. Typical Gas Heating Checkout (Multiple Zone)
Prerequisites
: All zone thermostats set to heat.
OUTPUT STATUS LEDs
DAMPER 2,3,4 OFF
(W) RED ON
HEATING ON
FAN ON
W1 ON
1.
Apply heating demand to all thermostats.
• All zone thermostat
W
LEDs on (heat demands)
• LEDs dampers 1 - 4 off (all dampers open)
• Output Heat LED
W1
on (furnace on)
• Heating LEDs on
The furnace begins ignition sequence after a heat demand 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 exceed 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:
• Output Heat
W1
LED off
• Heating LED off
• Fan LED off (blower turns off after delay)
• All zone thermostat
W
LEDs off
• Damper LEDs - Last zone thermostat demand removed: LED is off (this
zone’s damper remains open during 3-1/2 minute purge); 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).
Summary of Contents for Harmony III
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