Operation Modes And Functions - Heat Controller VMH09SC-1 Service Manual

Heat Controller, Inc.
Preheat mode:
• With the compressor off, a small amount of current flows through the windings of the compressor
heating the crankcase.
Preheat termination:
• If T4＞41°F/5°C or user turns on the machine and compressor runs, preheating function will stop.
• Crankcase heater starts when T4<41°F/5°C and stops when T4>59°F/15°C.

8.4 Operation Modes and Functions

8.4.1 Fan only mode.
(1) Outdoor fan and compressor stop.
(2) Temperature set function is disabled, and no set temperature is displayed.
(3) Indoor fan can be set to high/med/low/auto.
(4) The louver operates same as in cooling mode.
(5) The action of auto fan in fan-only mode is the same as auto fan in cooling mode within 75°F/24°C of the
set temperature.
VMH SerieS
°F °C
81.5 (27.5)
80.6 (27.0)
77.9 (25.5)
77.0 (25.0)
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Service Manual