Carrier 38QG15-H, Service And Maintenance Manual

Page: 7 / 44

5
6. SYSTEM OPERATING LIMITS *
COOLING HEATING
Difference
Dry Bulb
Temp. C°
Wet Bulb
Temp. C°
Difference
Dry Bulb
Temp. C°
Wet Bulb
Temp. C°
Indoor temperature
Maximum
Minimum
32
21
23
15
Indoor temperature
Maximum
27 -
Outdoor temperature
Maximum
Minimum
55
20
-
-
Outdoor temperature
Maximum
21 -
MAIN POWER SUPPLY
Difference
Nominal
200-240V/1PH/50HZ
Min. Voltage 187
Max. Voltage 264
NOTES:
* When the unit is operated above or below these limits for a long time, system diagnostics may detect
a malfunction and the unit will not operate properly.
** During heat pump operation the system will undergo several defrost cycles to remove ice that might
collect on the outdoor unit in very low ambient temperature.
After completion of defrosts cycle, the system will normally operate.
7. SYSTEM SAFETY PROTECTION
7-1 FOR HEAT PUMP SYSTEM
PROTECTION TYPE PROTECTION EFFECT OPERATION MODE WHEN ON
Cold draft prevention Indoor fan off Heating mode During unit operation
Defrost cycle Indoor fan off Heating mode During unit operation
Indoor coil
Freeze protection
Compressor off Cooling mode During unit operation
Against frequent
Compressor cycling
Compressor
Time delay
Cooling or heating
modes
At unit start-up or change
of operating mode
7-2 FOR COOL ONLY SYSTEM
PROTECTION TYPE PROTECTION EFFECT OPERATION MODE WHEN ON
Indoor coil
Freeze protection
Compressor off Cooling mode During unit operation
Against frequent
Compressor cycling
Compressor
Time delay
Cooling mode
At unit start-up or change
of operating mode