Basic Control - Carrier 38VMH-1P Service Manual

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Basic Control

NORMAL OPERATION
COMPONENT
Compressor (INV)
Outdoor Unit fan (FAN)
4-Way Valve
Electronic Expansion Valve (EEV)
Fast Oil Return Valve (SV4)
Hot Gas Bypass Valve (SV5)
Spraying Liquid Valve (SV6)
COMPONENT
Compressor (INV)
Outdoor Unit fan (FAN)
4-Way Valve
Electronic Expansion Valve (EEV)
Fast Oil Return Valve (SV4)
Hot Gas Bypass Valve (SV5)
Spraying Liquid Valve (SV6)
NOTE: Heating operation is not functional at an outdoor air temperature of 77°F or more.
LEGEND:
INV – Inverter
SV – Solenoid Valve
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 24 —Cooling Operation
NORMAL OPERATION
Capacity demand control
Cooling fan control
OFF
Discharge temperature control
17 minutes OFF then 3 minutes ON
OFF
Discharge temperature protection control
Table 25 —Heating Operation
NORMAL OPERATION
Capacity demand control
Heating fan control
ON
Discharge temperature control
17 minutes OFF then 3 minutes ON
OFF
Discharge temperature protection control
To build pressure difference
-
-
Adjust refrigerant flow rate to protect compressor
-
-
-
To build pressure difference
-
-
Adjust refrigerant flow rate to protect compressor
-
Open based on conditions at startup stage (after defrosting
and oil return operation)
-
24
REMARK
REMARK