71
7-3.
Hydro Unit Control
2-5) No heater operation
According to the DN setting, the unit switches the energize / not energize for the hot water cylinder, backup heater,
and booster. For details, see 9-1. (See page 142)
(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
DN_5A, DN_6D0, DN_6B5, DN_6D1.
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
The pump operation starts under the condition below:
• When the [
] or [ ] button is pressed.
• The pump speed changes to adjust the water flow rate. Pump speed control period is 1 [sec].
Basic flow rate
Heating / Hot water supply: FLrH = Capacity / 5 * 60 / 4.15 [L/min]
Cooling: FLrC = Capacity / 5 * 60 / 4.19 [L/min]
* See the pump Q-H characteristic. Design the water pipe length within the characteristic of the pump.
Target flow rate is finally determined with considering the correction according to ambient temperature and other
operation condition. And, target flow rate can be corrected by DN_6A7 setting, for example, considered pump
operation noise.
The minimum target value (FL_min): (Minimum flow rate) + 2 [L/min]
The maximum target value (FL_max): 33 [L/min]
When set DN_6A6 to “0000”, pump speed is fixed, it’s speed is depend on DN:A0 setting.
Item Operation flow and applicable data, etc.
Item Operation Initial value
Circulation
pump
Related DN
5A:
Built-in circulation pump P1’s action during hot water supply operation:
HP operation only / Always energized
0: HP operation only
6D0:
Built-in circulation pump P1’s action during heating operation:
Always energized / Turned off when TO sensor detect over than 20°C.
0: Always energized
6B5: External circulation pump P2’s action:
Non-synchronous / Synchronous with the built-in
circulation
pump P1
0: Non-synchronous
6D1:
Built-in circulation pump
P1 ON/OFF cycling (During long periods of system off) 0: None
Heating capacity
[kW]
Hot water supply
capacity [kW]
Cooling capacity
[kW]
Minimum flow rate
Heating / Hot water
supply mode [L/min]
Cooling / Defrost
mode [L/min] *
401 4.0 4.0 4.0 5.5 10.0
601 6.0 4.0 5.0 5.5 10.0
801 8.0 8.0 6.0 6.0 13.0
1101 11.0 8.0 8.0 6.0 13.0
DN Item Detail Factory default
6A6 Pump speed control 0000: Fixed speed 0001: Variable speed 0001: Variable speed
6A7 Pump speed control correction 0000: 100% 0001: 90% 0002: 75% 0003: 50% 0000: 100%
DN code A0 Pump flow rate
0 (Default) 100%
190%
280%
370%
460%
550%
To Next Page
Loading...
