50
8-3.
Hydro Unit Control
2-5) No heater operation
According to the DP_SW11 setting, the unit switches the energize / not energize for the hot water cylinder, backup
heater, and booster. For details, see 10-1. (See page 117)
(Caution)
All heater should be added to this Air to water system.
The system has been designed to operate with all electrical heaters energized.
3) Circulation pump control
One circulation pump (external circulation pump P2) can be connected to the unit in addition to the built-in
circulation pump P1.
You can change the settings of the built-in pump P1 and the external circulation pump P2 using
DP_SW10-1, 2, and 3 in the hydro unit.
If the external circulation pump P2 is set to Non-synchronous, the pump P2 is always energized.
3-1) Controlling the built-in circulation pump P1
Pump type: DC motor, rated voltage 220-230 V, 6 speed (changed manually)
The pump operation starts under the condition below:
• When the [
] or [ ] button is pressed.
The pump operation stops under the condition below:
• When the [ ] or [
] button is pressed.
(Operation will stop fully in about 1 minute.)
The pump operation stops/restarts under the conditions shown below.
• When changing operation modes, the pump stops for 30 seconds.
3-2) Controlling the built-in circulation pump P1 during the hot water supply operation
You can change the action of the built-in circulation pump P1 during the hot water supply operation using DP_SW10-1.
• DP_SW10-1 OFF (Default): The pump stops as the HP for hot water supply stops.
• DP_SW10-1 ON: The pump is always energized.
3-3) Controlling the built-in circulation pump P1 during the heating operation
You can change the action of the built-in circulation pump P1 during the heating operation using DP_SW10-2.
• DP_SW10-2 OFF (Default): The pump is always energized.
• DP_SW10-2 ON : The pump stops when To ≥ 20 °C. (Practically the HP for heating is turned off.)
3-4) Synchronized external circulation pump P2
Pump type: DC motor, rated voltage 220-230 V, connectable directly up to 200W rated power output.
You can select whether the pump P2 is synchronized with the pump P1 using DP_SW10-3. The pump P2 is always
energized if the pump P2 is not synchronized.
• DP_SW10-3 OFF (Default): Non-synchronous
NOTE:
2 zone temperature control by boiler with P1 OFF is required DP_SW10-3 OFF
3-5) Controlling the external circulation pump P2
You can change the action of the external circulation pump P2 during cooling operation by setting FC64.
• FC64=”00”(Default): The pump is always energized.
• FC64=”01” : The pump is always stopped.
Item Operation flow and applicable data, etc.
Item Operation Initial value DPSW
Circulation
pump
DPSW10
01:
Built-in circulation pump P1’s action during hot water supply operation:
HP operation only / Always energized
OFF: HP operation
only
SW10-1
02:
Built-in circulation pump P1’s action during heating operation:
Always energized / Turned off when TO sensor detect over than 20 °C.
OFF: Always
energized
SW10-2
03: External circulation pump P2’s action:
Non-synchronous / Synchronous with the built-in
circulation
pump P1
OFF: Non-
synchronous
*2
SW10-3
04:
Built-in circulation pump
P1 ON/OFF cycling (During long periods of
system off)
OFF: None SW10-4
FC_code A0 Pump flow rate
0 (Default) 100%
190%
280%
370%
460%
550%
Boiler is installed or not
(DPSW13_2)
Boiler position
(DPSW02_1)
P1 pump control
Stop/restart temperatures
(TWI or TWO or THO)
OFF
(Not installed)
OFF (After 3-way valve, heating side) 70 °C / 68 °C
ON (Before 3-way valve) 70 °C / 68 °C
ON
(Installed)
OFF (After 3-way valve, heating side) 70 °C / 68 °C
ON (Before 3-way valve) 58 °C / 55 °C
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