Installation manual

15 ©ESP Ltd. Sept 2008
D. When you need to add the refrigerant, please do so as follows:
2) Controller system test
Switch on the power to the unit, check the display of the wire controller-it
will display the water temperature when the unit is on standby mode. If
the wire controller display is showing an incorrect reading or an error
code, please refer to Section 6.9.
3) Debug the cooling system
a) On completing wiring of the unit, please release a little refrigerant from
the low pressure side, or use the vacuum pump to create the vacuum in
the system, until the pressure is below 70Pa.
b) Once the unit is in vacuum, please open the high pressure valve and the
low pressure valve until the pressure is balanced, then check the joints
for leaks.
c) Ducting—Please ENSURE that ducting is safely and appropriately fitted.
IMPORTANT Do not allow any impurities to enter the refrigerant system
4) Insulation treatment
As per the below picture, you must insulate all connecting pipes and you
must use good quality, non flammable, PVC insulating material, of 15mm-
20mm thickness.
(a) To keep the pipes in a tidy state, you may wrap the pipes together after
being separately insulated.
(b) Under no circumstances should you let electric wires come in to con-
tact with the plumbing.
NOTE: With the 400 Series, the ASHP and the cylinder are one unit and
the above should be interpreted accordingly.
4 . Installation 4 . Installation
4.13 INDIRECT THERMAL CUT-OUT AND 2-PORT MOTORISED
VALVE
To comply with Building Regulations and to prevent the unit from overheat-
ing a 2-port motorised valve MUST be fitted to the primary flow to the indi-
rect coil—See Figure 11 below Please note that this diagram may vary from
model to model, but the principle does not.
4.14 WIRING
All electrical wiring MUST be carried out by a competent electrician and be
in accordance with the latest I.E.E. Wiring Regulations. The wiring block
diagram is set out below in Picture 14.
Hot water air source heat pump Hot water air source heat pump