Section 4 - Installation
INSTALLATION
48 Installation and Maintenance
4.3.7.1 Installer Connections Key
1. Outdoor Unit 1
An earth shielded cable must be used for these connections..
T1 and T2 must be connected to the corresponding connections
in the outdoor unit. E1 must be used as the earth screen.
These connections can be combined with those of (4) Outdoor
Unit 2 in a Sheilded CAT5 cable.
2. Outdoor Unit 2
These 2 connections (XHB/XHA) must be connected to the
corresponding connections (XHB/XHA) in the Outdoor Unit. They
can be run in the same earth shielded cable as those of (3) Outdoor
Unit 1.
3. Zone 1 Thermostat:
The programmable thermostat for either the single space heating
circuit or space heating Zone 1 is to be wired into the ‘Zone 1 ON/
OFF Thermostat’ connection.
4. Zone 2 Thermostat:
For Two Zone space heating systems, the programmable thermostat
for Zone 2 is to be wired into the ‘Zone 2 ON/OFF Thermostat’
connection.
5. DHW Thermistor
When using a HP290 Pre-Plumbed cylinder, the Domestic Hot
Water Thermistor will be pre-installed as part of the package.
If using a Non-Pre-Plumbed cylinder, the DHW thermistor will
need to be inserted into the sensor pocket and secured to avoid
it being disturbed.
It is recommended to install insulation to
If using a third party DHW cylinder, refer to the manufacturer’s
installation guidelines for thermistor installation requirements.
Use the cables provided which can be extended if necessary.
6. CH Zone 2 Thermistor
This connection is not required for single zone systems, or if
multiple zones are to be managed separately from the HP290
Control system.
When using a 2 Zone HP290 Pre-Plumbed cylinder, the CH
Zone 2 Thermistor will be pre-installed as part of the package.
For installations without the HP290 pre-plumbed cylinder, a two
zone kit is required (Product code: 241520). For installations
with the HP290 Control Box, see section 4.3.5. For HP290
Controller installations, see Appendix 1.3.
7. MODBUS:
Connect MODBUS device here.
8. Mains supply
230 Vac mains power for the Indoor Control Box and the 3
kW immersion heater (if used). This cable should be routed
through the upper gland located to the right of the immersion
4.3.8 Electrical Safety Test
ᘐ WARNING: As a minimum, the below electrical safety
tests should be performed. Failure to do so, may result in
damage to the product and/or personal injury.
Upon completion of the electrical connections, electrical safety
tests are to be done to verify the integrity of the circuit.
heater contactor.
The electrical supply is to be taken from an Residual Current
Device protected circuit and must be compliant with the local
installation rules in force.
9. Immersion Heater
Output connection for a 230Vac immersion heater (as per
Section
4.2.5 Immersion Heater Wiring on page 43).
10. Programmable Room Thermostat 240v Power
Supply
If a Programmable Room Thermostat RF transceiver/
receiver is to be used then its power supply (240v) can
come from this connection.
11. Backup Boiler
If using a boiler backup application then a permanent live
from the boiler supply must be wired into the "L" connection
and the switched live to the boiler must be wired into the "sL"
connection.
12. Overheat Stat
When using a HP290 Pre-Plumbed cylinder, the DHW
Overheat Thermostat will be pre-installed as part of the
package. If using a Non-Pre-Plumbed Cylinder, the DHW
Overheat Thermostat will need to be installed in the sensor
pocket and secured to avoid it being disturbed.
If using a third party DHW cylinder then refer to the
manufacturer’s installation guidelines for overheat thermistor
installation requirements.
13. 3-Way Diverter Valve
When using a HP290 Pre-Plumbed cylinder, the 3-way
diverter valve will be pre-installed as part of the package. If
using a Non-Pre-Plumbed cylinder the 3-way diverter valve
will need to be installed and connected to the control box via
the ‘3-Way Diverter Valve’ connection and must spring return
to the CH position.
14. CH 1 Pump or Valve
ᘐ WARNING: Always comply with the boiler
manufacturers instructions.
The pump for either the single space heating circuit or space
heating Zone 1 is to be wired into the ‘CH1 Pump or Valve’
connection.
15. CH 2 Pump or Valve
For Two Zone space heating systems, the second zone
pump/valve is to be wired into the ‘CH2 Pump or Valve’
connection.
These tests are to be done by a competent electrician in
accordance with IET guidelines:
- Earth Continuity.
- Polarity.
- Resistance to Earth.
- Short Circuit.
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