Defrost - Panasonic Urban Multi MX1R Series Service Manual

Function
1.8

Defrost

1.8.1 MX1R Series
„ Function
Defrost operation is carried out if the relation of the outdoor unit's coil temperature (Tcoil) and outdoor
temperature (Tair) satisfies the conditions given below for 5 minutes continuously.
The values of (a) according to defrost temperature changeover switch are given in the table below.
LED (23 24 25 26)
Therefore, if outdoor temperature is 0°C:
(1) If position L, Tcoil ≤ –16°C
(2) If position M, Tcoil ≤ –14°C
(3) If position H, Tcoil ≤ –12°C
Because defrost operation is carried out, set to the "H" position if frost builds up easily, and set to "L" if not.
Factory set is position "M."
Defrost is carried out when the coil temperature rises to 9.5°C or higher or Pc > 22 kg/cm², and is
completed after defrosting for 10 minutes.
After defrosting, indoor units carry out hot start operation and the DEFROSTING display lights until hot start
is complete.
Defrost conditions are not counted from completion of power supply set-up and defrost until the
compressor runs (count) for 20 minutes.
248
Tcoil≤C · Tair-
Switch position L
(OýOýOý{)
(deg) 16
20 minutes
Power supply set-up
• Tcoil
:
Temperature detected by R2T
• Tair
:
Temperature detected by R1T
• C
: Tair<0˚C→0.8
Tair≥0˚C→0.6
M
(OýOý{ýO)
14
5 minutes 20 minutes
Defrost start Complete
Function Urban Multi "MX1R, ME1R Series" Using R-407C
PACD011001C2
(M104)
H
(Oý{ýOýO)
12
5 minutes 10 minutes
Defrost start Complete