Toshiba MMC-P0151H, Руководство по обслуживанию

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3-50
Check
code
Detected
position
Check code
name
Cause
(Position)
Trouble detection condition Check item (Position)
b5 Indoor Indoor outside
input alarm Alarm display
by outside
input By voltage Vemg to be input
in outside alarm input terminal
(Vemg < 1.25V was detected
for 60 seconds.) • When outside equipment is connected to
connector (CN21)
1) Check outside equipment error.
2) Check indoor P.C. board error.
• When outside equipment is not
connected to connector (CN21)
1) Check indoor P.C. board.
b6 Indoor
Indoor outside
interlock Display of
outside
interlock input • By voltage value Vemg to be
input in outside alarm input
terminal
(Vemg < 3.75V was
detected for 60 seconds.)
• When outside equipment is connected to
connector (CN21)
(Indoor main P.C. board (MCC-1361)).
1) Check outside equipment error.
2) Check failure of indoor main P.C.
board (MCC-1361).
• When outside equipment is not
connected to connector (CN21)
(Indoor main P.C. board (MCC-1361)).
1) Check indoor main P.C. board
(MCC-1361).
b7 Indoor Indoor unit
No. 2 to 16 in
grouping Indoor unit
alarm in
group
operating Server unit error in group
operating Check each indoor unit with the remote
controller
b9 Indoor Indoor
pressure
sensor alarm Indoor
pressure
sensor Indoor pressure sensor output
was zero.
(After judgment, operation
transmits to automatic backup
operation.) • Check connection and wiring of connector
(CN23) of indoor pressure sensor and
indoor main P.C. board (MCC-1361).
• Check indoor pressure sensor error.
• Check failure of indoor main P.C. board
(MCC-1361).
bb Interface Discharge
temp. TD2
alarm
Discharge
temp. (TD2)
protection The protective stop when
discharge temp. TD2
exceeded 130°C and repeats
for 3 times or more. • Check service valves.
(Gas side, Liquid side are fully open.)
• Check for blockage of outdoor PMV.
1) Refrigerant choke circuit (PMV A)
2) Cooling bypass circuit (PMV B)
3) Liquid line check valve
(Cooling only model)
• Check TD2 sensor resistance value
characteristics
• Check refrigerant shortage, piping
blockage
bd Interface Mg-SW
deposit
protective
operation
Fixed-speed
Mg-SW
deposit
protective
control is
operating. 30 seconds passed after
outdoor (compressor) stops,
1 Discharge temp. 135°C for
fixed-speed compressor
was detected.
2 Ps pressure < 0.02MPa and
TD
≥
60°C were detected.
3 Pd pressure
≥
3.2MPa and
TD
≥
80°C were detected.
[NOTE]
During control operation, if
high pressure Pd becomes
3.2MPa or more, the outdoor
fan operates.
The indoor PMV and outdoor
PMV are forcibly opened, and
the cooling cycle is formed.
• Check contact of the fixed-speed Mg-SW.
• Check for refrigerant shortage.
• Check discharge temp. TD sensor error at
fixed-speed unit side.
• Check Pd and Ps pressure sensors error.