Section 9: Commissioning Page 47
9.9 Weather Compensation
During commissioning, the four climatic curve parameters MUST be
checked and the default values adjusted to suit the design parameters
for the system in question. Refer to Section 8.2.2 for details.
Warm Weather Operation
If, during commissioning, the ambient air temperature is higher
than the air temperature setting (Te2) - parameter 2105 for the
climatic curve, the weather compensation function will NOT
allow the heat pump to operate to provide space heating.
To override this and force operation of the heat pump (e.g. to check
operation or commission the heat pump), parameter 2100 must be
set to 0. The weather compensation will be switched off and the
heat pump will operate at a fixed set point of 45°C irrespective of the
outdoor air temperature.
If weather compensation is required, e.g. if the installation is to meet
RHI requirements, parameter 2100 MUST be reset to 1 once the heat
pump has been commissioned or the operation checked.
Alternatively, to operate the heat pump without touching the weather
compensation settings, set the system controls to provide a hot water
demand so that the heat pump operates to provide hot water heating.
Reset the hot water controls to the normal setting once the heat pump
has been commissioned or the operation checked.
The weather compensation function MUST be operational for
the installation to meet RHI requirements.
NOTE
!
9.10 Frost Protection Function Setting
Refer to Section 3.10.2 for details.
9.11 Pump Operation and Air Bleeding from Heating
System
The circulating pump can be operated to aid removal of the air from
the heating system.
To operate this function access the Terminal PCB.
• Check DIP SW4 is set to ‘OFF’.
•
Dip switch positions:
Up: ON
Down: OFF
NOTE
!
Press the Pump SW. Refer to Figure 9-4.
• Wait for a few seconds. The pump will start and each of the six
outer digital segments on the right-hand digit of the display on
the terminal PCB will light up sequentially during pump operation.
• The pump stops automatically after 10 minutes of operation. If all
the air could not be released from the water circuit, press Pump
SW again (after the pump has stopped) to operate the pump for
another 10 minutes.
If you want to stop the pump before it stops automatically, press
Pump SW again.
Display
Pump SW.
Figure 9-4: Water loading and air bleeding in the hydraulic circuit
9.12 Pump Output Setting
The water pump is supplied factory set to maximum output (level
3), i.e. with both DIP SW5 and DIP SW6 in the OFF position (down
position). Refer to Figure 8-9.
As this pump performance may be too high for many systems,
the water pump should be re-set to minimum (level 1) when
commissioning the heat pump.
To do this, set DIP SW6 to ON (up position). Refer to Figure 8-9.
During commissioning, check that the required flow rate is produced
in the heating system.
This will usually be indicated by achieving a temperature difference
between the heat pump flow and return of approximately 8°C when
the heating system is operating and up to temperature.
To determine the temperature difference, check the flow and return
temperatures using the ‘Monitor Display Function’ on either the
remote controller or Terminal PCB. Refer to Section 10.7 of these
installation Instructions for details of how to check the flow and return
water temperatures.
If necessary, the water pump output can be adjusted to achieve the
required temperature difference between flow and return when the
heat pump is operating.
The water pump can be set to the required output (e.g. level 1 or
level 2) by resetting the position of either DIP SW5 or DIP SW6, as
follows:
• For pump output level 2: Set DIP SW5 to ON (up position)
• For pump output level 1: Set DIP SW6 to ON (up position)
9.13 Coastal Installations
If the Aerona³ heat pump is installed within 15 miles of the coast, the
evaporator must be sprayed with AFC50 and this repeated on each
annual service.
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