CENTRAL HEATING Chofu User manual
Chofu
Commissioning Guide
Page: 3 of 15
This document must be read in association with the Chofu Installation Manual provided with the unit. It is essential the
manual is read and followed to ensure the installation is as per manufacturer’s criteria. The purpose of this document
is to assist with the commissioning of the heat pump parameters and the connection of third party controls.
Pre-Commissioning
Pre-Commissioning Checks .......................................................................................................................................................................................4
Filling the System with Water ....................................................................................................................................................................................4
Heat Pump Controller ...................................................................................................................................................................................................5
Room Thermostat Connection
Room Thermostat Connection .................................................................................................................................................................................6
Heating and Cooling changeover ...........................................................................................................................................................................6
Heat Pump Controller Settings
Heat Pump Controller Settings .................................................................................................................................................................................7
System Conguration
System A: Heat Pump Switched On/O by Room Thermostat(s) Heating Only ................................................................................... 8
System B: Heat Pump Switched On/O by Room Thermostat(s) + DHW, Heating Only ..................................................................9
System C: Heat pump Switched On/O by Room Thermostat(s) Heating & Cooling ......................................................................10
System D: Heat Pump Switched On/O by Room Thermostat(s) + DHW, Heating & Cooling ..............................................11-12
System Operational Checks
Checking Sensor Values .............................................................................................................................................................................................13
Resetting Errors
Resetting Errors..............................................................................................................................................................................................................14
Additional Information
Additional Information ...............................................................................................................................................................................................14
Commissioning Guide
Contents
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Pre-Commissioning Checks
Prior to Filling with water
A: Ensure the heat pump is installed in accordance with the installation manual.
B: Ensure the power is isolated to the unit.
C: Remove the side cover of the unit to expose the water pump, compressor and electrical enclosure.
D: Check the pre-charge of the expansion vessel is set to 1 bar.
Filling the System with Water
Thoroughly ush the system with a ushing cart or suitable mains pressure, until there is no sign of air returning
through the primary feed pipes. This will remove most of the air from the system. Now pressurise the system to
1 Bar on the heat pumps pressure gauge. The heat pump has a pump run switch on the terminal PCB under the
side cover of the heat pump. This allows the circulation pump to be run manually to help fully vent the system
of air. Ensure the automatic air vents in the system are open.
Pre-Commissioning
Page: 5 of 15
Heat Pump Controller (connection)
The Chofu heat pump controller must be installed to manage the heat pump operation. The controller is not rated
for outdoor use, installation indoors in a dry place is recommended; i.e. garage or service cupboard.
Terminal #1 and #2.
Low voltage, not polarity sensitive.
DO NOT APPLY 230V TO THESE TERMINALS.
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Connect room thermostat wiring to terminals #20, #21 via the normally open contacts of the room thermostat. The
thermostat requires volt free contacts to open/close terminals #20, #21. If the thermostat features a switched live
output for on/o, an external relay with volt free contacts will need to be used. Open contacts = O; Closed contacts
= On. These terminals are enabled when changing parameter 5120. See system conguration for more details.
If your room thermostat has heating and cooling functionality it can change the operating mode of the heat
pump. Connect the thermostat changover wiring to terminals #24, #25 via the normally open contacts of the
room thermostat. The thermostat requires volt free contacts to open/close terminals #24, #25. If the thermostat
features a switched live output for changover, an external relay with volt free contacts will need to be used.
Open contacts = Heating; Closed contacts = Cooling. These terminals are enabled when changing parameter 5124.
See system conguration for more details.
Room Thermostat
Connection (remote contact)
Heating and Cooling
change over
Low voltage, not polarity sensitive.
DO NOT APPLY 230V TO THESE TERMINALS.
Low voltage, not polarity sensitive.
DO NOT APPLY 230V TO THESE TERMINALS.
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Heat Pump
Controller Settings
Procedure for resetting parameters
In SERVICE level, all parameters can be
reset to the default when the LOW tari/
Night mode button is pressed and held
for 10 seconds.
For service level
1. Press the Menu, and buttons simultaneously for 3 seconds. The INSTALLER level setting menu
will be displayed.
1. Enter the password to access the SERVICE level, specify parameter number “9999” and enter password
“738”, and press the Set button to conrm entry of the password.
1. “SErv” (means SERVICE) will be displayed in the position of room temperature display. In SERVICE level,
all parameters can be accessed. The procedures of setting parameters are same as INSTALLER level.
2. To return to normal operation, press and hold the Menu, and
for 3 seconds, or simply do nothing for approximately 10 minutes.
The heat pump controller must be installed to manage and congure control parameters.
For install level
1. For Install parameters hold down the 3 buttons
together for 3 seconds.
2. The parameter number (4 digits) will be displayed,
and the value of the parameter. (2 of the 4 parameter
digits will be ashing).
3. Change these (ashing) numbers using the Up/Down
buttons, or
4. Change to the other 2 digits using the +/– buttons,
or and changes these too if necessary.
5. Press the Set button
6. The parameter value will now ash.
7. Change value using the or buttons.
8. Press the Set button to conrm the new value.
9. To default back to the main menu, press together for
3 seconds. The controller will default back to the main menu screen.
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The following is a list of common congurations that are typically used. If you require something specic to your
installation please contact us for a tailored list of parameters.
System A: Heat pump switched On/O by room thermostat(s) Heating Only
System B: Heat pump switched On/O by room thermostat(s) Heating + DHW
System C: Heat pump switched On/O by room thermostat(s) Heating & Cooling
System D: Heat pump switched On/O by room thermostat(s) Heating & Cooling + DHW
System A: Heat Pump Switched On/O by Room
Thermostat(s) Heating Only
System Configuration
Parameter Description
Value
Default Set To
2101
Flow temperature set point for heating
35 to 45 underoor (depending on oor covering)
60 – radiators
45 See
description
4301 Start temp of frost protection on room air temperature 14 5
5120
Terminal 20-21: On/O remote contact or EHS Alarm input
0 = Disable (Remote controller only)
1 = On/O remote contact
2 = EHS Alarm input
0 1
5126
Flow switch input, terminals 26-27:
0 = Disable
1 = Enable
1 0
Page: 9 of 15
Parameter Description
Value
Default Set To
2101
Flow temperature set point for heating
35 to 45 underoor (depending on oor covering)
60 – radiators
45 See
description
3101 0 = DHW is unavailable
1 = DHW is available, and priority DHW over space heating 0 1
3111 DHW set temperature (of water in cylinder) 50 50
4130 Maximum outgoing water temperature in Heating and DHW
(service menu)** 60 56
4301 Start temp of frost protection on room air temperature 14 5
5107
Enable DHW sensor: Terminal 7-8
0 = Disable
1 = Enable
0 1
5120
Terminal 20-21: On/O remote contact or EHS Alarm input
0 = Disable (Remote controller only)
1 = On/O remote contact
2 = EHS Alarm input
0 1
5126
Flow switch input, terminals 26-27:
0 = Disable
1 = Enable
1 0
5150
Enable DHW 3-way valve: Terminal 50-51-52
0 = Disable
1 = Enable
0 1
System B: Heat Pump Switched On/O by Room
Thermostat(s) Heating + DHW
** May be required when using DHW and primary feed pipe length is >15m.
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Parameter Description
Value
Default Set To
2101
Flow temperature set point for heating
35 to 45 underoor (depending on oor covering)
60 – radiators
45 See
description
2120
Cooling, enable outgoing water set point*
0 = Fixed set point
1 = Climatic curve enabled
0 1
2122 Maximum outgoing water temperature in Cooling mode 20 20
2123 Minimum outgoing water temperature in Cooling mode 18 10
2124 Minimum outdoor air temperature corresponding to maximum
Outgoing water temperature 25 15
2125 Maximum outdoor air temperature corresponding to maximum
Outgoing water temperature 35 25
4301 Start temperature of frost protection on room air temperature 14 5
4410
Compensation of room humidity***
0 = Disable
1 = Enable
1 1
4411 Room relative humidity value to start increasing
Outgoing water temperature set point*** 55 40
System C: Heat Pump Switched On/O by Room
Thermostat(s) Heating & Cooling
* Leave set at xed set point when using fan coils.
*** Only required when radiant cooling is used.
System C continues on the next page
Page: 11 of 15
System C: Heat Pump Switched On/O by Room
Thermostat(s) Heating & Cooling continued
Parameter Description
Value
Default Set To
4412 Maximum outgoing temperature hysteresis corresponding
to 100% relative humidity*** 40 15
5117
Terminal 17-18: Humidity sensor
0 = Disable
1 = Enable
0 1
5120
Terminal 20-21: On/O remote contact or EHS Alarm input
0 = Disable (Remote controller only)
1 = On/O remote contact
2 = EHS Alarm input
0 1
5124
Terminal 24-25: Heating/Cooling mode remote contact
0 = Disable (Remote Controller Only)
1 = Cooling is CLOSE contact, Heating is OPEN contact
2 = Cooling is OPEN contact, Heating is CLOSE contact
0 1
5126
Flow switch input, terminals 26-27:
0 = Disable
1 = Enable
1 0
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