Control of Indoor Unit Si30-408
32 Basic Information
4.4 Heater Control
4.4.1 Heater Control of VRV System
Optional heater (wiring modification adapter is required) is made on/off under the conditions
below.
On Condition (All
Conditions
should be
Satisfied)
Heating mode & thermostat-on
Not under hot-starting
Not under preparation of oil-return or defrosting
Not under pressure equalizing
Tc (High pressure equivalent saturation temperature transmitted from outdoor) < 50°C
Th2 (Indoor liquid pipe thermistor) < 43°C
Off Condition
(Any One of the
Conditions below
should be
Satisfied.)
Becomes any mode except heating
Thermostat-off
Under hot-starting
Under preparation of oil-return or defrosting
Under pressure equalizing
Tc > 60°C
Th2 > 47°C
4.4.2 Fan Residual Operation
In order to prevent the thermal protector from actuation during heater is off, the fan will be
operated with residual operation for the certain period of time after heater is off. (This operation
shall be carried out regardless of heater)
Residual operation time = Ceiling suspended type: 100 seconds, others: 60 seconds
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