Control Of Outdoor Unit; Initial Processing - Mitsubishi Electric PUHY-200YMF-C Service Handbook

5 5 5 5 5 CONTROL

[1] Control of Outdoor Unit

(1) Initial processing

• When turning on power source, initial processing of microcomputer is given top priority.
• During initial processing, control processing corresponding to operation signal is suspended. The control process-
ing is resumed after initial processing is completed. (Initial processing : Data processing in microcomputer and
initial setting of each LEV opening, requiring approx. 2 minutes at the maximum.)
(2) Control at staring
• In case unit is started within 2 hours after turning on power source at low ambient temperature (+5˚C or less), the
unit does not start operating for 30 minutes at the maximum.
(3) Bypass, capacity control
• Solenoid valve consists of bypass solenoid valve (SV1, SV2) bypassing between high pressure side and low
pressure sider. The following operation will be provided.
1) Bypass solenoid valves SV1 and SV2 (both "open" when turned on)
Item
When starting compressor
After thermost "ON is returned
and after 3 minutes restart
When compressor stops in
cooling or heating mode
After operation stops
During defrosting operations
During oil recovery opera-
tions
During 20Hz operations, at
fall in low pressure or low
pressure saturation tempera-
ture. (3minutes or more after
starting)
When high pressure rises
(Pd)
When high pressure rises
(Pd) during 20Hz operations
(3 minutes after starting)
When discharge temperature
rises
(3 minutes after starting)
Compressor
Bypass
solenoid
Start
valve (SV1)
(4-minute)
SV1
ON (Open) OFF (Close)
Turned on for 4 minutes
Turned on for 4 minutes
Always turned on
Turned on for 3 minutes
Always turned on
Always turned on.
Always turned on.
–
When Pd When Pd is
2
reaches 24kg/cm G
27.5kg/cm 2 G (2.35MPa) or
(2.70MPa) or less 30
more seconds
–
Thermo. Thermo.
OFF ON
(2-minute)
SV2
ON (Open) OFF (Close)
Turned on for 4 minutes
Turned on for 4 minutes
–
–
Always turned on.
Always turned on.
–
When Ps is 1.5kg/ When Ps is 2.5kg/
cm 2 G (0.15MPa) or cm 2 G (0.25MPa) or
less more
When low TH2 is When TH2 is
–30˚C or less –15˚C or more
When Pd reaches When Pd is 23.5kg/
2 2
26.5kg/cm G cm G (2.30MPa) or
(2.60MPa) or more less after 30 seconds
When Pd reaches When Pd is 23kg/
2 2
25.5kg/cm G cm G (2.25MPa) or
(2.50MPa) or more less after 30 seconds
Turned on when high When high pressure
pressure (Pd) ex- (Pd) is 20kg/cm
ceeds pressure limit (1.96MPa) or less
When temp. exceeds When discharge
130˚C and Pb temp. is 115˚C or
2
reaches 15kg/cm G less
(1.47MPa) or more
Defrost-
ing time
(*1)
(4-minute)
–58–
• PU(H)Y-200·250YMF-C : Y
• PU(H)Y-P200·250YMF-C : Y-P
• PURY-200·250YMF-C : R2
• PURY-P200·250YMF-C : R2-P
Object
Y Y-P R2
2 G
Stop
(3-minute)
R2-P