Mitsubishi Electric PURY-M200YNW-A1 Service Handbook page 161

[5-3 HBC Control ]
(4) Recovering from Defrost
The setting of the dip switch 001-9 determines the defrost method (bypass defrost or heat recovery defrost).
As shown in the following flow chart, the bypass defrost may be performed during the heat recovery defrost depending on the
operation status.
30
- chapter 5
Heating-only or
Heating-main
Receiving
No
"Defrost" signal
from OC
Yes
HBC Dip switch
SW001-9
OFF
High pressure heat recovery defrost:
LEV1, 2 = 3000
LEV3 = 3000
Pump = Always in operation
Indoor unit VB3 during Thermo-ON = Fully open
Water temp. < 28ºC
No
Freezing is
suspected.
No
Receiving
No
"Defrost" signal
from OC
Yes
Recovering from Defrost
ON
Bypass defrost
Yes
No
Yes
No. of freezing
< 3 times
Yes
Lower the frequency,
count the No. of freezing.
BS_05_M