Estia HWS-1501CSHM3-E Manuel D'installation page 5

AIR TO WATER HEAT PUMP SYSTEM
EN
4.0
6
3.5 A drain cock must be fitted below the water cylinder in the inlet pipework. It must
be sited between the water cylinder and the Check Valve.
3.6 A sanitary circuit expansion vessel may be fitted to the cold water supply as
shown in Diagram 2 to prevent wastage of expanded water. The following sizes
are recommended:
150 litre 12 litre vessel
210 litre 18 litre vessel
300 litre 24 litre vessel
3.7 A re-circulation circuit can be installed on the sanitary water circuit. A connection
is provided for the re-circulation circuit return pipe (threaded G3/4 female).
3.8 The primary heating circuit MUST be connected via the Hydro Unit. Refer to the
Installation Instructions supplied with the Hydro Unit for full details.
Diagram 2
8
9
6
7
ELECTRICAL REQUIREMENTS
4.1 The unit is supplied with a factory fitted cylinder heater complete with thermal
sensor and over-temperature cut-out. The cylinder heater is rated 2.75kW at
230V~.
4.2 The cylinder heater is located behind the white terminal cover on the front of the
unit. The cover is secured by 2 screws on each side of the cover and a threaded
domed nut on the front of the cover. ISOLATE THE ELECTRICAL SUPPLY
BEFORE REMOVING THE COVER.
4.3 The cylinder heater MUST be earthed.
4.4 All electrical wiring should be carried out by a competent electrician and be in
accordance with the latest national Wiring Regulations. The circuit must be
protected by a suitable fuse and double pole isolating switch with a contact
separation of at least 3mm in both poles.
4.5 The cylinder heater should be wired in accordance with Diagram 3 and the Air to
Water Heat Pump Installation Manual. The supply cable must be via the Heat
Pump Controls Housing, direct connection to the mains electrical supply will
invalidate the guarantee and may result in a dangerous installation. The supply
cable must be routed through the right hand cable gland provided and the outer
sheath of the cable firmly secured by tightening the screw on the cable gland.
The recommended cable type is 2.5mm
4.6 The thermal sensor should be connected to the Heat Pump Controls Housing in
accordance with Diagram 3 and the Air to Water Heat Pump Installation Manual.
INSTALLATION AND SERVICE MANUAL
4
3
1
5
2 3 core heat resistant sheathed.
1 COLD WATER INLET
2 ISOLATING VALVE
3 SAFETY GROUP NF7 BAR
1
4 SANITARY WATER
EXPANSION VESSEL
5 DISCHARGE PIPE
2
6 PRIMARY CIRCUIT RETURN
7 PRIMARY CIRCUIT FLOW
8 HOT WATER OUTLET
9 SANITARY WATER
RE-CIRCULATION
CONNECTION