Toshiba MMW-AP0481CHQ-E Service Manual page 41

(A)
Is outdoor unit ambient temperature within
the use temperature range?
-25°CDB ~ 40°CDB
-25°CWB ~ 28°CWB
Yes
Is H-HWM TC1 temperature
less than room temperature + 5°C?
Yes
Is discharge gas pipe temperature of
FS unit connected to H-HWM more than
room temperature + 5°C?
* Do not touch the discharge gas pipe directly.
It's very dangerous since the temperature
at the discharge gas pipe rises to
approximately 100°C.
(see the figure below)
Yes
Flow selector unit
(FS unit)
Flow selector unit - Multi port type
(FS unit)
No
No
FS unit = Flow selector unit
No
Discharge gas pipe
* Do not touch by hand, since
– 41 –
Install the outdoor unit in a place
within the use temperature range.
H-HWM cascade heat exchanger
trouble
Outdoor unit or connection pipe
(between outdoor unit and H-HWM
FS unit ) trouble
Check FS unit.
1.SVD coil and valve body
2.SVS coil and valve body
3.Discharge gas pipe check valve
4.P.C. board
5.Wiring (coil )
6.Wiring (between FS unit and
H-HWM)
7.Power supply
Failure → replace
piping is very hot.
Discharge gas pipe
* Do not touch by hand, since
piping is very hot.