section 8: operation
Page 37
8.3 Water Pump management
8.3.1 main water pump
Fundamentally, the ON/OFF of the main water pump links to ON/
OFF of the compressor, but the setting ON/OFF of the pump during
compressor OFF states, due to reaching the room set point shall be
set in the following parameters:
•
Always ON, apart if any alarms are active or if the heat pump is
in OFF mode
•
ON/OFF based on thermal store temperature
•
ON/OFF based on detect cycle
If the thermal store temperature probe is enabled, the main water
pump turns ON if the thermal store temperature is lower than
outgoing water set point (fixed or calculated by climatic curve) –
hysteresis, in heating mode. When the thermal store temperature
reached the set point (fixed or calculated by climatic curve), the
main pump turns OFF.
8.3.2 continuous operation “Always on”
When the heat pump is set to “heating” (i.e. not in standby) the
main water pump will always remain ON.
When the heat pump is set to standby, the pump will remain OFF
and will only be started in the conditions described in paragraph in
Section 8.3 (Frost protection).
8.3.3 Detect operation “Detect cycle”
In order to minimise energy consumption, the main water pump
can be configured to start only when there is demand from the
temperature controller.
The pump will be activated periodically, for a time set by
parameter. Five seconds before the cycle ends, if the outgoing
water temperature is lower than “water set point – hysteresis”, the
compressor will be activated and the pump will remain ON. When
the compressor stops, the pump will continue running for a time set
by parameter, after which it will be switched OFF and will repeat the
detect cycles.
The interval between one detect cycle and the next is set by a
parameter.
Refer to Figure 8-6 (detect cycle).
the ‘detect cycle’ is allowed only for space heating. If the heat
pump is working to produce DHW the main water pump has to
run continuously.
! nOtE !
8.3.4 Warm Weather operation
At ambient temperatures exceeding the maximum outdoor
air temperature setting (Te2) – Parameter 2105, the weather
compensation function will not allow the heat pump to operate to
provide space heating.
to override this and force the operation of the heat pump (e.g.
to check operation or commission the heat pump) parameter
2100 must be set to 0. With this setting the heat pump will
operate at a fixed set point of 45°c irrespective of the outdoor
air temperature.
If the weather compensation function is required, Parameter 2100
must be reset to 1 once the heat pump has been commissioned or
its operation checked.
the weather compensation function mUst be operational if
the installation is receiving an rHI payment.
! nOtE !
Delay time
OFF
Time OFF
Time ON
(3min)
(5min)
(3min)
(5sec)
Water temp. detect
Compressor ON
OFF
Main water pump ON
OFF
figure 8-6:
Detect cycle
table 8-7:
Detect cycle parameters
level
Parameter
function description
Display and input value
remarks
Group
code
Default
Min.
max.
Unit
I
42 00
Type of configuration of Main water pump
0=always ON
1=ON/OFF based on thermal store temperature
2=ON/OFF based on Detect
0
0
2
-
To be set to
the following
combinations
Parameter
5111=0
→Parameter
4200=0 or 2
Parameter
5111=1
→Parameter
4200=0 or1 or 2
I
42 01
Time ON main water pump for detect cycle
3
1
15
1min
I
42 02
Time OFF main water pump
5
5
30
1min
I
42 03
Delay time OFF main water pump from OFF compressor
3
1
15
1min
I
51 11
Terminal 11-12 : thermal store temperature probe
0=disable
1=enable
0
0
1
-
For details of how to access the parameter settings, refer to Section 9.3.
Summary of Contents for Aerona3 HPID12R32
Page 71: ...NOTES Notes Page 71...
