7.1.2. Thermo-regulating function
(1) Thermo-regulating function (Function to prevent restarting for 3 minutes)
When indoor units are connected to the PUHY/PURY/PQHY/PQRY series of outdoor units.
• Thermo-ON/OFF conditions
TH24: Discharge air temperature
TH21: Return air temperature (Thermistor or remote controller)
To: The set point temperature on the remote controller
Return Air Control
Discharge Air Control
Thermo OFF
TH21 < To - 0.9 °F [0.5 °C]
[a) or b) or c)]
a) TH21 < To
b) TH21 < 57.2 °F [14 °C]
c) TH24 < To – 3.6 °F [2 °C]
continues over 10 minutes
Thermo ON
TH21 > To +0.9 °F [0.5 °C]
[a) & b) & c) & d)]
a) TH24 > To +1.8 °F [1 °C]
b) TH21 > 59 °F] [15 °C]
c) TH21 > To +1.8 °F [1 °C]
d) Thermo-OFF continues over 3 minutes
(2) Anti-freezing control
• Detected condition:
When the liquid pipe temp. (TH22) is 33.8° F or less 16 minutes after compressors start up, anti-freezing
control starts and unit goes to thermo OFF.
• Released condition:
The timer which prevents reactivating is set for 3 minutes, and anti-freezing control is cancelled when any
one of the following conditions is satisfied.
1) Liquid pipe temp. (TH22) reaches 50° F or above.
2) The condition of the thermo OFF has become complete by thermo-regulating, etc.
3) The operation mode is changed to mode other than COOL.
4) The operation is stopped.
7.1.3. Fan
(1) Set the fan speed using the remote controller
Type
Fan speed notch
3 speeds
[Low], [Med], [High]
• [Auto] fan speed control is not available.
PAC-AH001-1
21
© 2018 Mitsubishi Electric US, Inc.
