Toshiba HWT-601XWHM3W-ETR Service Manual page 74

Item
7-3. 3-6) Controlling the built-in circulation pump P1 during cooling operation controlled with the room temperature thermostat
Hydro Unit Control or room temperature remote controller.
You can change the action of the built-in circulation pump P1 by setting DN_65.
• DN_65 = "00" (Default): The pump is always energized.
• DN_65 = "01": The pump is stopped when the thermostat is turned off.
3-7) Interval operation of the pump P1 during thermostat off operation (For energy saving)
The pump of the hydro unit performs intermittent operation according to the outdoor temperature during thermostat
off (compressor off) operation.
NOTE:
When boiler is installed (DN_6B0 = "1"), do NOT set intermittent operation or do NOT set the valve of A (DN_BA)
lower than the Boiler-heat pump switching temperature (DN_23).
A, lower limit of To during the heating operation, must be higher than the Boiler-heat pump switching
temperature.
Because when To is lower than the Boiler-heat pump switching temperature, the boiler output is ON state. But
if the pump stops due to the intermittent operation, the boiler output is also turned OFF.
Related DN
DN
5A
64
65
9E
6E
BA
BB
Operation flow and applicable data, etc.
Setting item
Control of the pump P1 during the hot water supply operation
Control of the pump P2 during in cooling operation
Control of the pump P1 while using the room temperature control
or room temperature thermostat
Turn off the P1 when TO sensor detect over than this temperature 20°C
Pump P1 restart diff TO sensor temperature, when turn off the P1
by to sensor detection.
intermittent operation at
TO ≥ A°C (heating)
intermittent operation at
TO < B°C (cooling)
Default
0: synchronized with
HP
0: Always ON
0: Always ON
2: 2K
0: continuous operation -5 ~ 20°C
0: continuous operation 25 ~ 35°C
73
Setting value
1: Always energized
1: Always stopped
1: Stopped when the
thermostat is OFF
10 ~ 30°C
1 ~ 5K