Panasonic Urban Multi MX1R Series, Service Manual, Page: 54 / 643

PACD011001C2 Function
Function Urban Multi “MX1, ME1 Series” Using R-22 33
1.8 Defrost
1.8.1 MX1 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 (
α
) according to defrost temperature changeover switch are given in the table below.
Therefore, if outdoor temperature is 0°C:
(1) If position L, Tcoil
≤
-12°C
(2) If position M, Tcoil
≤
-10°C
(3) If position H, Tcoil
≤
-8°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 12.5ºC or higher, 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.
Tcoil
≤
C · Tair-
α 




•
Tcoil : Temperature detected by R2T
•
Tair
: Temperature detected by R1T
•
C : Tair < 0°C
→
0.8
Tair
≥
0°C
→
0.6
Switch position
LED (23 24 25 26)
L
(
O OýO {
)
M
(
O O { O
)
H
(
O { O O
)
(deg) 12 10 8
Power supply set-up
T coil
12.5ºC
06.Tair · U
20 minutes 5 minutes
Defrost start Complete
20 minutes 5 minutes 10 minutes
Defrost start Complete
(VG002)