Page 20
IM 818
Special Features
Dry mode
•
Select this mode when the standard Cool mode does not
provide sufficient dehumidification. The compressor and
indoor low fan will cycle together and will operate for
longer periods of timeto provide the increased rate of
dehumidification. As a result, the room temperature dif-
ferential may increase slightly.
Heat mode (heat pump only)
•
When the unit is switched on from cold start or defrosting
cycle, the indoor fan will start to operate only after the
coil warms up.
•
When the set temperature is achieved, the indoor fan will
operate until the coil cools down.
Overheating protection (heat pump only)
•
In case the coil overheats (145°F), the compressor will
cut out.
Frost prevention
•
If the indoor coil starts to frost, an LED light will blink to
indicate that the unit is in defrost.
Fan speed and rated cooling capacity
•
The rated cooling capacity is provided at high indoor fan
speed.
•
The cooling capacity is slightly lower when the unit is
operating at MEDIUM and LOW fan speed.
Operating Conditions
Cooling
* 32
°
F on size 20 and 25, 23
°
F on size 30, 40 and 50 with optional Low Ambient
Kit.
Heating (heat pump only)
Ts = Dry Bulb Temperature, Th = Wet Bulb Temperature
Overall Checking
Ensure that:
1. The unit has been mounted properly.
2. Refrigerant tubing connections have been checked for
leaks.
3. Proper wiring and circuit breakers have been installed.
Drainage check:
Check condensate drain for leaks and proper flow. See Drain
Test
, p
age 6.
Test run:
Check the following items:
• Are all electrical plugs firmly inserted into there recept-
cales?
• Is there any abnormal sound from the unit?
• Is there any abnormal vibration on the unit itself or piping?
Confirm that:
1. Condenser fan is running, with warm/cold air blowing off
the outdoor unit. (Cooling only/Heat Pump)
2. Evaporator blower is running and discharge cool/warm air.
(Cooling only/Heat Pump)
Note: The
control
incorporates a 3 minute randum start
delay in the circuit. Thus, it requires about 3 minutes
before the outdoor unit will start.
Temperature
Ts (dry bulb) °F
Th (wet bulb) °F
Minimum Indoor
61
52
Maximum Indoor
90
73
Minimum Outdoor
66*
24
Maximum Outdoor
114
75
Temperature
Ts °F
Th °F
Minimum Indoor
61
—
Maximum Indoor
86
—
Minimum Outdoor
16
21
Maximum Outdoor
75
64
