Application Information; Operating Range - McQuay M5RT 90 BR Technical Manual

Application Information

Operating Range

Ensure the operating temperature is within the allowable range, as stated in diagram below:
Cooling
52
50
43
40
30
20
10
0
-10
10 20
14 19
Indoor WB temperature (°C)
The applicable operating range for unit with economizer feature same like normal unit.
However, the restriction of fresh air opening will occur in high ambient or low ambient in order to ensure the
reliability of the unit.
For high ambient in cooling operation, fresh air opening will be restricted at not more than 15%. When the
outdoor DB temperature is more than 50°C, the fresh air opening will be closed to 0%.
For low ambient in heating operation, fresh air opening will be restricted at not more than 10% to avoid cold
draft issue.
It is recommended to select an appropriate fresh air opening by considering the whole operating range of the
air-conditioner unit in both cooling and heating operation.
20
18
10
0
-10
-15
-20
10
23 30
Indoor DB temperature (°C)
Heating
20 30
15 27
6
CAUTION
The use of the air conditioner outside the
range of working temperature and humidity
can result in serious failure.