Lennox Harmony III User Manual

21
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ash,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signicantly,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signicantly,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conrmthateachindividual
zone damper functions properly, repeat these steps for zones 2 - 4.

Lennox Harmony III Specifications

General

Brand	Lennox
Model	Harmony III
Category	Control Systems
Language	English