Si30-408 Method of Troubleshooting
Troubleshooting 77
In Heating with
Subcooled
Degree Control
In ON / OFF
Judgment for
Heating Hot Start
Subcooled degree (SC) = Tc-Tl
Tc-Tl decreases.
(Subcooling does not work.)
Subcooled degree (SC) = Tc-Tl
Tc-Tl increases.
(Subcooling works excessively.)
• Indoor unit liquid pipe thermistor
· When the resistance deviates to smaller value.
(Higher temperature detected)
· When the resistance deviates to larger value.
(Lower temperature detected)
Indoor electronic extension
valve closes.
Indoor electronic extension
valve opens.
Liquid refrigerant is stagnant in indoor heat exchanger.
(High pressure rises due to heating overload.)
Refrigerant delivery among indoor
units cannot be balanced.
• Indoor unit liquid pipe thermistor
· When the resistance deviates to larger value.
(Lower temperature detected)
Condition for canceling hot start
Tl ≥ 35 ˚C or 3 minutes elapse from thermostat ON.
Tl ≤ 35 ˚C is detected.
Hot start cancellation delays. (For 3 minutes or less)
Tc: Equivalent saturation temperature of detected value of outdoor high pressure sensor (Pc)
Tl: Detected temperature of indoor liquid pipe thermistor
(Th2 for units using R22 or R407C, R2T for units using R410A)
Insufficient capacity for
start-up
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