Temperature Adjustment Function; Fan; Drain Pump; Vane - Mitsubishi Electric PKFY Series Technical & Service Manual

Control Mode
1. Temperature 1-1. Determining temperature adjustment function
adjustment
(Function to prevent restarting for 3 minutes)
function
• Room temperature ] Set temperature + 2°F ···Thermo-ON
• Room temperature [ Set temperature ···Thermo-OFF
1-2. Anti-freeze control
■ Condition to detect
When the pipe temperature detection thermistor/liquid (TH22) detects 32°F or less in 16 minutes
from thermo-ON, the anti-freeze control initiates, and the unit enters to the thermo-OFF.
■ Condition to release
The timer which prevents reactivating is set for 3 minutes, and anti-freeze control is
cancelled when any one of the following conditions has been satisfied:
1 Pipe temperature detection thermistor/liquid (TH22) reaches 50°F or above.
2 The condition of thermo-OFF has been completed by the thermostat.
3 The operation has changed to a mode other than COOLING.

2. Fan

By the remote controller setting (switch of 4 speeds+Auto)
4 speeds + Auto type
When [Auto] is set, fan speed is changed depending on the value of:
∆T = Room temperature − Set temperature
High
Med2
Med1
Low

3. Drain pump

3-1. Drain pump control
• The drain pump will always run when the unit is in COOL or DRY mode.
(Regardless of the thermo ON/OFF)
• Whenever the operation is changed over to the other modes (including Stop), the drain
pump will stop pumping after approximately 3 minutes.
Float switch control
• Float switch control judges whether the sensor is in the air or in the water by turning the
float switch ON/OFF.
In the water: Detected that the float switch is ON for 15 seconds.
In the air: Detected that the float switch is OFF for 15 seconds
Float SW
ON
OFF

4. Vane

(1) The initial vane setting for COOL mode will be the horizontal position.
(up/down vane
(2) Vane position:
change)
Horizontal →Downward A →Downward B →Downward C→Downward D→Swing→Auto
(3) Restriction of the downward vane setting
If the vane position is set to Downward A/B/C/D in [Med1], [Med2], or [Low], the vane will
return to the horizontal position after 1 hour has passed.
OCH715
Control Details
Type
Auto
1.8-F 3.15-F
15 s 15 s
In the water In the air
21 21
Fan speed notch
⊿T
5.4-F
15 s 1 min 30 s 1 min 30 s
In the water Error
postponement
Remarks
• The ON/OFF commands
by the indoor unit
thermostatic control
are not an ON/OFF
commands to the
compressor but an
open/close commands
to the linear expansion
valve. (The compressor
stops only when the
thermostatic control
for all the indoor units
connected to the same
outdoor unit turns OFF.)
Drain pump
abnormal
• "1h" appears on the wired
remote controller.