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HARMONY III
T
SERIES
Gas Heating Checkout − Central Control
Prerequisites:
S
Central mode switch on
S
Red LED on the central mode fan switch on
OUTPUT STATUS LEDs
W1 on
(W) RED on
DAMPER 2,3,4 OFF
hEATING on
fan on
central mode On
1. Set zone 1 thermostat for a heat demand; check:
D
Zone 1 thermostat W LED on (heating demand).
D
Output Heat W1 LED on (furnace on).
D
Heating LED on.
D
All damper LEDs off (damper open).
2. The furnace will begin its ignition sequence after Zone
1 has demanded heat. The zone control system will
start the furnace blower on low speed (0 PIAB air) 45
seconds after the combustion cycle has begun.
3. When warm air is sensed by the discharge air sensor,
the fan LED will light and the blower will slowly in-
crease to speed. The blower will operate at a speed
equivalent to the PIAB calculated for all zones calling,
taking into account the heating air reduction jumper
position. It may take the blower 60 to 90 seconds to
reach this speed.
4. Remove the heat demand from zone 1 (no heat input
or output and no blower demand). Upon removal of the
demand from zone 1, check:
D
Zone 1 thermostat W LED off (no heat demand).
D
Output Heat W1 LED off.
D
Fan LED off.
D
Heating LED off.
After 3−1/2 minute purge time, furnace blower turns off.
Heat Pump Heating Checkout − Single Zone
Prerequisites:
S
Zone 1 thermostat set to Heat
OUTPUT STATUS LEDs
DAMPER 2,3,4 on
DAMPER 1 Off
(W) RED 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
PRESSURE
SWITCH LED ON
hEATING on
fan on
ELECTRIC hEATING on (W/EVENT 3)
1. Set zone 1 thermostat for a heat demand; check:
D
Zone 1 thermostat W LED on (heating demand).
D
Damper LED 1 off (damper open).
D
Damper LEDs 2, 3, and 4 on (dampers closed).
D
Output Heat Y1 LED on (compressor on).
D
Heating LED on.
D
Fan LED on.
D
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 accord-
ing 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
−
charge air sensor continually samples air tempera-
ture. If, after 4 minutes, air temperature is not warming
significantly, the high speed compressor energizes.
D
Output Heat Y2 LED on (high speed compressor).
3. The discharge air sensor continually samples air tem-
perature. If, after (another) 4 minutes, air is not warm-
ing significantly, auxiliary heat sequence begins:
D
Electric Heating (E−Heating) LED on.
D
Output Heat W1 on, followed by (if available, and if
necessary) W2, and then W3.
4. Remove heat demand from zone 1.
D
All LEDs off, except:
D
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.