Mitsubishi Electric CITY MULTI PQRY-P200YMF-B Service Handbook page 56

(b) In case AL=2 and Td-Tc
excessive refrigerant replenishment and trouble mode)
• Changed to intermittent fault check mode preceded by 3 minutes restart prohibition. Error stop is observed when
trouble is detected again in the same intermittent fault check mode (for 30 minutes after unit stops for intermittent
fault check).
• When turning on liquid level trouble ignore switch (SW2-6), error stop is not observed, and 3 minutes restart
prevention by intermittent fault check mode is repeated. However, LED displays overflow.
(Turning SW2-6 on makes the error of TH6 < outdoor air sensor > ineffective.)
(8) Control of heat source unit fan and heat source unit heat exchanger capacity
1) Control system
Depending on capacity required, control SV3~6, SV71~73, for maintaining evaporation temperature (0˚C) in cooling
operations, and high pressure saturated temperature (52˚C) in heating operations.
2) Heat exchanger pattern
Mode
SV3
Cooling-only
×
×
×
Cooling-main
×
×
×
×
×
×
×
Heating-only
×
Heating-main
×
20 deg is detected for 3 consecutive minutes during liquid level detection (control at
Heat Exchanger Switching
SV4 SV5 SV6
×
×
× ×
× × ×
× × ×
× ×
× ×
× × ×
×
×
×
× ×
× ×
× × ×
× × ×
× ×
× ×
× ×
×
× × ×
× × ×
× ×
× ×
×
× ×
×
× ×
× ×
× ×
×
× ×
×
× ×
× ×
× ×
–53–
SV71 SV72 SV73
×
× ×
× ×
× ×
×
× ×
×
× ×
×
×
× ×
×
× ×
×
× ×
× ×
×
× ×
× ×
×
× ×
×
× ×
× ×
×
×
×
×
×
× ×
× ×
×
×
×
×
×
Remarks
×
×
×
×
×
8 HP only
×
10 HP only
×
10 HP only
×
×
×
×
×
8 HP only
×
×
×
×
8 HP only
×
10 HP only
×
10 HP only
×
10 HP only
×
×
×
×
10 HP only
10 HP only