38MGR-04SM Specifications subject to change without notice. 27
High Condenser Coil Temperature Protection
Fig. 30 — High Condenser Coil Temperature
Protection
Outdoor Unit Anti-Freezing Protection
When T2<39°F (4°C) for 250 seconds or T2< 32°F (0°C), the indoor
unit capacity demand is zero and resumes the normal operation when
T2>46.4°F (8°C) and the protection time is no less than three minutes.
Oil Return
Rules for Operation:
1. If the compressor frequency remains lower than the frequency set
for the setting time, the unit raises the frequency to the frequency
set for the setting time and then resumes the former frequency.
2. The EXV continues at 300p while the indoor units maintain their
operation. If the outdoor ambient temperature is higher than the set
frequency during the oil return, the unit stops the oil return process.
Low Outdoor Ambient Temperature Protection
When the compressor is off and T4 is lower than -31°F (-35°C) for ten
seconds, the unit stops and displays “LP.”
When the compressor is on and T4 remains lower than -40°F (-40°C)
for ten seconds, the unit stops and displays “LP.”
When T4 is no lower than -25.6°F(-32°C) for ten seconds, the unit
exits protection.
Controls and Functions
Capacity Request Calculation
Cooling Mode
Fig. 31 — Cooling Mode
Table 25 — Cooling Mode
Table 26 — Cooling Mode
NOTE: The final result is an integer.
Use Table 27 and the final capacity request to confirm the operating
frequency.
Table 27 — Cooling Mode
The maximum running frequency is adjusted according to the outdoor
ambient temperature.
Fig. 32 — Maximum Running Frequency
T3
T1 Ts
CAPACITY AREA a b c d e f
NORM CODE (N) 3 2 1.5 1 0.5 0
MODEL 9K 12K 18K 24K
HP 1.0 1.2 1.5 2.5
Frequency
(Hz)
0 COOL_F1 COOL_F2
...
...
COOL_F24 COOL_F25
Amendatory
Capacity
Demand
0 1 2
...
...
24 25
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