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2.3. Heat Pump System Start-Up and Checkout
IMPORTANT
The zone control system power-up must occur at the same time or before the furnace or air handler unit is powered up.
2.3.1.
Powering the System (All Systems)
1.
Adjust all thermostat settings so that no demand will occur.
2.
Apply power to the zone panel transformer and to the air handler and observe the following: all four diagnostic LEDs will light; then each individual diagnostic LED
will light in sequence; then all four diagnostic LEDs will light and extinguish.
3.
Finally, the status light will begin to flash, indicating proper operation. Perform heat pump heating checkouts referenced in this section.
2.3.2. Checkouts
2.3.2.1. Typical Heat Pump Heating Checkout (Single Zone)
Prerequisites
: Zone 1 thermostat set to heat.
OUTPUT STATUS LEDs
DAMPER 2,3,4 ON
DAMPER 1 OFF
(W) RED ON
PRESSURE
SWITCH LED ON
HEATING ON
FAN ON
ELECTRIC HEATING ON (W/EVENT 3)
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
1.
Set zone 1 thermostat for a heat demand; check:
• Zone 1 thermostat
W
LED on (heating demand).
• Damper LED 1 off (damper open).
• Damper LEDs 2, 3, and 4 on (dampers closed).
• Output Heat
Y1
LED on (compressor on).
• Heating LED on.
• Fan LED on.
• 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 setting of
the PIAB jumper for zone 1. 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 4 minutes, air temperature is not warming significantly, the high
speed compressor energizes. Output Heat
Y2
LED on (high speed compressor).
3.
The discharge air sensor continually samples air temperature. If, after (another) 4 minutes,
air is not warming significantly, auxiliary heat sequence begins:
• Electric Heating (E-Heating) LED on.
• Output Heat
W1
on, followed by (if available, and if necessary)
W2
, and then
W3
.
4.
Remove heat demand from zone 1.
• All LEDs off, except:
• Damper LEDs 2, 3, 4 on.
To check the amount of air being delivered to each zone and to confirm that each individual
zone damper functions properly, repeat these steps for zones 2 - 4.
Summary of Contents for Harmony III
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