Carrier 38MHRC Service Manual page 24

38MHRC: Service Manual
Evaporator Coil Temperature Protection
Fig. 28 —Evaporator Coil Temperature Protection
When the evaporator temperature is higher than the setting protection
value, the compressor stops.
AUTO Mode
AUTO mode can be selected with the remote controller and the setting
temperature can be changed between 60.0°F~86°F (16°C~30°C).
In the AUTO mode, the unit chooses either COOLING, HEATING or
the FAN-ONLY mode accT2, T4 and relative humidity.
Fig. 29 —AUTO Mode
Heating*: COOLING ONLY models run at fan speed. The indoor fan
runs in the AUTO fan speed for the relevant mode. The louver operates
the same as in the relevant mode.
If the unit switches mode between HEATING and COOLING, the
compressor repeatedly stops for a certain time and then chooses the mode
according to T1-Ts. If the setting temperature is modified, the unit selects
a running function again.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
DRYING mode
The indoor fan speed is fixed at breeze and can not be changed. The
louver angle is the same as in the COOLING mode.
Low Indoor Room Temperature Protection
In the DRYING mode, if the room temperature is lower than 50°F
(10°C), the compressor stops and does not resume until the room
temperature exceeds 53.6°F (12°C).
Evaporator anti-freezing protection, condenser high temperature
protection and outdoor unit frequency limit are active and are the same as
that in the COOLING mode. The outdoor fan operates the same as in
COOLING mode.
FORCED OPERATION Function
Enter FORCED OPERATION function:
When the machine is off, press TOUCH to engage the Forced Auto
Mode. Press TOUCH again, within 5 seconds, to engage the FORCED
COOLING mode. In FORCED AUTO, FORCED COOLING or any
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other operation mode, press TOUCH to turn off the unit.
In the FORCED OPERATION mode, all general protections and the
remote controller are available.
Operation Rules:
FORCED COOLING mode:
The compressor runs at the F2 frequency and the indoor fan runs as a
breeze. After running for 30 minutes, the unit enters the AUTO mode at a
75.2°F (24°C) setting temperature.
FORCED AUTO mode:
The FORCED AUTO mode is the same as the normal AUTO mode with
a 75.2°F (24°C) setting temperature.
AUTO-RESTART function
The indoor unit is equipped with an AUTO-RESTART function, which
is carried out through an auto-restart module. In case of a sudden power
failure, the module memorizes the setting conditions before the power
failure. The unit resumes the previous operation setting (not including the
swing function) automatically 3 minutes after the power returns.
If the memorization condition is the FORCED COOLING mode, the
unit runs in the COOLING mode for 30 minutes and enters the AUTO
mode as 75.2°F (24°C) setting temp.
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If the air conditioner turns off before the unit powers off and the air
conditioner is required to restart immediately, the compressor delays for 1
minute when the power is on. Under other conditions, the compressor has
a 3 minute delay when it restarts.
Refrigerant Leakage Detection
With this new technology, the display area displays EC when the outdoor
unit detects a refrigerant leak.
46°F (8°C) Heating
When the compressor is running, the indoor fan motor runs without the
anti-cold air function. When the compressor is off, the indoor fan motor is
off.
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