Function PACD011001C2
248 Function Urban Multi “MX1R, ME1R Series” Using R-407C
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.
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.
Switch position
LED (23 24 25 26)
L
(
OýOýOý
{
)
M
(
OýOý
{
ýO
)
H
(
Oý
{
ýOýO
)
(deg) 16 14 12
• Tcoil
• Tair
• C
:
:
:
Temperature detected by R2T
Temperature detected by R1T
Tair<0˚C→0.8
Tair≥0˚C→0.6
Tcoil≤C · Tair-
(M104)
Power supply set-up
20 minutes
5 minutes
Defrost start Complete
20 minutes
5 minutes
10 minutes
Defrost start Complete
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