Thermino® xPlus with Phnix Greentherm R290 Heat Pump – Wiring & Settings
(D0086-PX)
NOTICE
Please read & comply with all these instructions before commencing installation. Failure to install and operate this system in accordance with these instructions will invalidate the manufacturer’s warranty.
Please leave these instructions with the customer for future reference.
Always use these instructions in conjunction with the Installation and User Instructions Manual of the purchased Sunamp heat battery.
1. Introduction
1.1 General
The following instructions provide guidance for the installer and end-user of Thermino® xPlus Heat Batteries when used with compatible Heat Pumps.
These instructions must be read in conjunction with the Installation and User Instructions Manual for the Thermino xPlus product (document D0084 for EU/UK and document D0101 for US/CA).
All installations must be carried out by a competent installer in accordance with local codes and regulations for plumbing, electrical installations and potable water supply.
1.2 Symbols Used
In these instructions the following symbols are being used to draw the user’s attention to information of particular importance.
WARNING
Indicates a hazardous situation that, if not avoided, could result in death or serious injury.
CAUTION
Indicates a hazardous situation that, if not avoided, could result in minor or moderate injury or material damage.
NOTICE
Signals information that is considered important but not hazard related.
1.3 Abbreviations
The following abbreviations are used throughout the manual:
AC – Alternating Current
dT – delta T (change in Temperature)
DHW – Domestic Hot Water
HP – Heat Pump
kW – Kilo Watt
PCB – Printed Circuit Board
PVC – Polyvinyl Chloride
2. Safety
2.1 General Safety Notices
WARNING
Only competent persons suitably qualified to carry out plumbing and electrical work may undertake installations, repairs or relocations of the appliance.
Product training on the full range of Thermino heat batteries is available from Sunamp or authorised training partners.
WARNING
Risk of electric shock – potential dual supply. Always isolate the power supplies to the heat battery controller before working on the heat battery.
CAUTION
These instructions must be read in conjunction with the Installation and User Instructions for the respective Thermino product.
CAUTION
Do not operate the immersion heater until the correct commissioning procedure has been identified and the unit has been appropriately commissioned (see document D0114).
3. Heat Pump Sizing Guideline
This section details the sizing guidance for the Thermino xPlus range of products with Heat Pumps. Its purpose is to assist and offer a guideline for choosing the correct size of Thermino xPlus Heat Battery to Heat Pump Capacity and promote sizing.
The graph below details the relationship between Flow Rate (l/min) and Power (kW) at dT’s of 5 and 7, which are the most common range of operation for heat pumps used in Domestic Hot Water (DHW) mode.
Figure 1 – Power vs Flow Rate relationship
The Thermino xPlus Heat Batteries work to an ideal recommended flow rate for charging via Heat Pumps as detailed in the Installation Manual (D0084 – Table 1). Therefore, the following compatibility table can be used as a sizing guide between Heat Pump Capacity and Heat Battery size:
Heat Battery Size |
Heat Pump Capacity Range (kW) |
|||
(3 to 5) |
(5.5 to 7.5) |
(8 to 10.5) |
(11 to 14) |
|
Thermino 150 xPlus |
o |
o |
o |
Δ |
Thermino 210 xPlus |
! |
o |
o |
Δ |
Thermino 300 xPlus |
! |
! |
o |
o |
|
! – Caution: Special consideration must be given to heat up and reheat times when combining low powered heat pumps with high capacity heat batteries. o – fully compatible sizing. Δ – compatible with the use of an Autobypass valve to ensure the flow rate of the heat pump is within the recommended flow rate for the Heat Battery sizing. | ||||
Table 1: Heat Battery size and Heat Pump capacity compatibility
The Autobypass valve is always recommended in installations with Thermino xPlus Heat Batteries as it also assists in the Heat Pump’s defrost condition requirements.
PX.1 - Phnix Greentherm R290 Heat Pump
WARNING
All Electrical wiring must be carried out by a competent person and be in accordance with the latest local wiring codes and regulations.
Risk of electric shock – potential dual-supply. Always isolate the power supply/ies to the Heat Battery, Heat Pump & Solar Diverter controller (if used) before working on the appliances.
When installing the Thermino xPlus with the heat pump, the steps below should be followed.
These settings are applicable to the following products:
Thermino xPlus with the “PX01” & “PX02” Optimino keys (D0084 – Section 6.4.2 for wiring instructions & Figures PX.1 & PX.2 below)
Heat Pumps from the Phnix Greentherm R290 range
PX.2 - Wiring
Using a 2-core shielded cable 0.75mm2, the cable will act as a hot water heating tank sensor from the Sunamp Optimino Board (OPTB) – terminal J3 into the Heat Pump Interface controller PCB Terminal – (TT – DHW Temp Sensor) (please refer to HP installation manual). Please run the wire into the heat battery appliance via the appliance case cabling grommets and then into the control box housing through the hole available. Secure the cables in terminals J3 on the Optimino Board; please see Figures PX.1 & PX.2 below for reference.
Figure PX.1 - Thermino xPlus with PX01 Optimino key
Figure PX.2 - Thermino xPlus with PX02 Optimino key
NOTICE
For other hydraulic connections and wiring instructions, please follow the Instructions of the Sunamp Thermino xPlus Installation Manual (D0084)
PX.3 - Phnix Greentherm R290 controller settings
On the Main Menu select “Mode”. Select DHW from the Mode menu.
Jumper the DHW terminals on the Heat Pump wiring terminals “5 & 6”, “DHW ON/OFF”.
Unlock the screen to access the “Parameter” Menu. Please apply the following changes to the parameters:
Function |
Setting |
H01 - AutoStart |
YES |
R01 – Hot Water Setpoint |
55°C |
R16 - Power-on Return Difference of Tank Water |
5°C |
R17 – Standby Temp Difference of Tank Water |
5°C |
R37 – Max Hot Water Setpoint |
70°C |
Table PX.1: Phnix Greentherm HP controller settings
NOTICE
If following a DHW daily timed schedule, please ensure that a minimum time window in line with the installed Heat Battery and Heat Pump capacities is chosen, and that potential defrost cycles during this window are accounted for.
4. Appendix
The purpose of this appendix is to enumerate the heat pump manufacturers, heat pump models and the test dates. Please note that all recommended settings, integration and compatibility relate to the product and firmware version at the time of testing. Please see table below for more information:
Manufacturer |
Heat Pump Name/Model |
Date of Test |
Phnix |
Greentherm Series R290, PASRW040-BP-PS-D |
06/12/22 |
Document Part Number: D0086-PX
Version Number: 1.6
Publication Date: 29.09.2025
Sunamp Ltd
1 Satellite Park
Macmerry
East Lothian
EH33 1RY
Scotland
Customer Service (Phone): +44 (0)1875 610 001
Customer Service (Email): customerservice@sunamp.com
www.sunamp.com