Special Features; Dry Mode; Heat Mode (Heat Pump Only); Overheating Protection (Heat Pump Only) - Daikin IM-820 Installation And Maintenance Manual

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 time to 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

Temperature Ts (dry bulb) °F
Minimum Indoor
Maximum Indoor
Minimum Outdoor
Maximum Outdoor
° °
* 32 F on size 20 and 25, 23 F on size 30, 40 and 50 with optional Low Ambient
Kit.
Page 20
Th (wet bulb) °F
61 52
90 73
66* 24
114 75
Heating (heat pump only)
Temperature
Minimum Indoor
Maximum Indoor
Minimum Outdoor
Maximum Outdoor
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.
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.
Ts °F Th °F
61 —
86 —
16 21
75 64
IM 820