Mitsubishi Electric CITY MULTI CMB-WP1016V-GA1, Service Handbook

Page: 82 / 294

[
VI
Control ]
- 73 -
HWE1410A GB
Bypass Control
-5- Bypass Control
Solenoid valves have two types: (SVM1) that bypass the high- and low- pressure sides; LEV (LEV3). They perform the fol-
lowing functions.
(1) Bypass solenoid valve (SVM1) (ON: open)
Plate heat exchanger contro
-6- Plate heat exchanger control
(1) Cooling-only Thermo-ON and Cooling-only test run
 When three minutes have passed after the LEV operates with initial opening, the LEV opening is adjusted every 1 minute to
keep the amount of superheat before and after the plate heat exchanger constant.
(2) Heating-only Thermo-ON
 When three minutes have passed after the LEV operates with initial opening, the LEV opening is adjusted every 1 minute to
keep the amount of subcool before and after the plate heat exchanger constant.
(3) Cooling-main/Heating-main Thermo-ON and Cooling-main/Heating-main refrigerant recovery
1) Periodic control for LEV1
The LEV opening is adjusted the same way as described in (2) Heating-only Thermo-ON and Heating-only refrigerant recov-
ery.
2) Periodic control for LEV2
To be fully open (3000)
Operation mode
SVM1
ON OFF
Cooling-only Thermo-ON Always ON
Cooling-main Thermo-ON Always OFF
Heating-only Thermo-ON Always OFF
Heating-main Thermo-ON Always OFF
Defrost Always ON during heat recovery de-
frost
OFF except to perform heat recovery
defrost
Stop Always OFF
Cooling-only Thermo-OFF Always ON
Thermo-OFF (Heating-only, Mixture of
units in cooling and heating)
Always OFF
Cooling-only test run Always ON
Test run for stop Always ON
0000002394.book 73 ページ ２０１６年１月１２日 火曜日 午後４時４９分