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2.3.2.2. Typical Heat Pump Heating Checkout (Multiple Zone)
Prerequisites: All zone thermostats set to heat.
ELECTRIC HEATING ON (W/EVENT 3)
OUTPUT STATUS LEDs
DAMPER 2,3,4 OFF
(W) RED ON
PRESSURE
SWITCH LED ON
EVENT SEQUENCE:
1- Y1 ON
2- Y2 (IF EQUIPPED) ON
IF NO SIGNIFICANT
WARMING AFTER 4 MIN.
3- W1 ON IF NO
SIGNIFICANT WARMING
AFTER 4 MIN; THEN W2;
THEN W3
HEATING ONFAN ON
1. Apply heating demand to all thermostats.
• All zone thermostat W LEDs on (heat demands).
• Output Heat LED Y1 on (compressor).
• Heating and Fan LEDs on.
• LEDs dampers 1 - 4 off (all dampers open).
• Pressure Switch LED on.
The compressor in the outdoor unit begins operating in the heating mode. At
approximately the same time, the indoor blower starts, operating at a speed
according to the PIAB jumper settings for all zones. It may take the blower 60
to 90 seconds to reach this speed.
2. If Single-Stage Heat Pump - skip to step 3. The discharge air sensor
continually samples air temperature. If, after four minutes, air temperature is
notwarmingsignicantly,thehighspeedcompressorenergizes.OutputHeat
Y2 LED on (high speed compressor).
3. The discharge air sensor continually samples air temperature. If, after (another)
fourminutes,airisnotwarmingsignicantly,auxiliaryheatsequencebegins:
• Electric Heating (E-Heating) LED on.
• Output Heat W1 on, followed by (if available, and if necessary) W2, and
then W3.
4. Remove the heat demand from all zones.
• Input LEDs off.
• Fan LED off (Blower off).
• Heating 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).
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