23
2.3.2.3. Typical Heat Pump 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
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 ON
FAN ON
ELECTRIC HEATING ON (W/EVENT 3)
CENTRAL
MODE ON
1. Set zone 1 thermostat for a heat demand; check:
• Zone 1 thermostat W LED on (heating demand).
• Output Heat Y1 LED on (compressor on).
• Heating LED on.
• All damper LEDs off (dampers open).
• Pressure Switch LED on.
The outdoor-unit compressor begins operating in the heating mode (low-speed if
2-stage compressor). 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 not warming
signicantly,thehighspeedcompressorenergizes.OutputHeatY2 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 LED on, followed by (if available, and if necessary) W2, and
then W3.
4. Remove the heat demand from zone 1. Upon removal of the demand from zone
1, check:
• Zone 1 thermostat W LED off (no heat demand).
• Output Heat Y1, (Y2) LED(s) off.
• Fan and Heating LEDs off.
To Next Page
Loading...
Need help?
General
