B9 Cooling / Cooling T - Toshiba HWS-G1901CNMR-E Service Manual

Domestic Hot Water Heat Pump
7.11.03 B9 Cooling / B10 Cooling T
The cooling function activates a three-way damper, which directs the cold exhaust air to a room
with cooling requirements. The two functions operate the damper in opposite directions.
The Cooling function allows an area to be cooled up by the DHW-HP exhaust air, activating a
damper motor controlled by the extra relay (GP1).
The setup of the cooling function is carried out using the function menu B9 (Cooling) & B8
(Cooling T) and installer menu D28 m(Cooling type)
Set point
Code Description
name
The Cooling function can be activated. See installer menu D28 (Cooling
B9 Cooling
type).
The air temperature set point (°C) below which the heat pump stops,
B10 Cooling T
when the unit is in the Cooling function.
The fan and heat pump run until the additional temperature sensor, BT5,
placed in the room environment is below a certain level. The water
temperature can only reach the maximum temperature allowed in the tank
Cooling 1
D33 (T HP max). The cooling function activates a three-way damper, which
directs the cold exhaust air to a room with cooling requirements. The two
D28
functions operate the damper in opposite directions
Cooling 1 (2). If BT5 is higher than B10 T Cooling, the extra relay that
operates the damper (GP1) switches ON (OFF).
Cooling 2
If BT5 is lower than B10 (T Cooling), the extra relay that operate the
damper (GP1) switches OFF (ON).
The following schematic shows the electrical connections for the cooling operation
230VAC ~ 50Hz
L
N
BLU
BLK
BRN
N
L
Solenoid valve.
Solenoid ON for 2 min
before compressor
starts and during
system defrost
High pressure switch.
Compressor STOP when
Pd ≥ 2.0MPa
30
Service Manual
Factory
Range
setting
OFF/ON OFF
10 - 30 21
Cooling1 /
Cooling1
Cooling2
BT5
Room
temperature
Under floor
BT1
BT2
heating
or
FM
Cooling
BT3
EB1
BT4