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Horizon Series Owner’s Manual 5
Position of Dehumidistat Knob 1 2 3 4 5___________________
Approximate Room Setpoint 70% 60% 48% 35% 25% Relative Humidity
• In “OFF” the machine will never start
• In “CONT” the machine will never stop
NOTE: Humidistat settings are approximate only. For critical applications, you may
want to confirm actual settings with a psychrometer and adjust according.
Operation
During normal operation, the dehumidifier will automatically cycle “on” and “off” to maintain
your desired set point. If it should need to run for extended periods of time, the
dehumidifier features an automatic defrost cycle to melt any ice that accumulates on
evaporator coil. Approximately every 35 minutes of continuous operation, the unit will test
for the need for a defrost cycle. If required, it will defrost for approximately 3 minutes.
Warning: Never apply an external source of heat to melt ice off coil.
Maintenance – Annual Inspection of Coils and drain line is required.
1. Unplug Unit
2. Filter may be cleaned by
a. Vacuuming
b. Washing with warm, soapy water. Rinse and shake dry.
3. Coils may be cleaned by
a. Vacuuming the external surfaces of coil
b. Blowing compressed air from behind coils. Hold air nozzle 6” away from coil to
avoid damage.
Warning: Do not steam clean refrigerant coils.
4. Plug in Unit
5. Test Refrigerant Charge
a. Confirm compressor is running and allow to run for minimum of 15 minutes
i. If under 70°F, a layer of ice will form on evaporator coils
ii. If over 70°F, a layer of frost or water droplets will form on coil
6. Test Defrost System
a. Leave unit running for approximately 35 minutes. The unit should enter a
defrost mode for approximately 3 minutes. The unit will run fan only for a
period of time and then check the temperature of the coil. If necessary, the
unit will enter a defrost mode with the compressor operating and fan off to
defrost the coil If the unit will not defrost, either
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