Installation manual

14 ©ESP Ltd. Sept 2008
Table 1 - Sizing of copper discharge pipe (D2) for common T&P relief
valve sizes
4.12 HOW TO CONNECT TO THE HEAT PUMP
As the heat pump is an integral part of the unit, please contact the manufac-
turer for additional information where required.
PLEASE NOTE that only manufacturer approved engineers should carry out
any work on the heat pump. Call the manufacturer for the name of an ap-
proved engineer in your area.
THE FOLLOWING IS FOR REFRIGERANT ENGINEER ONLY:
1) Vacuum and filling Refrigerants.
The unit is supplied pre-gassed. Should a refrigerant fill be required at any
point, please note the following:
When you have finished the connection between the heat pump and the hot
water unit, you must create a vacuum in the hot water unit. See below pic-
tures 6 & 7 below:
A. Unscrew the screw cap of the high pressure valve on the heat pump, and
connect the multiplex manometer to the check valve.
B. Connect the vacuum pump to the multiplex manometer, then open them to
create a vacuum in the hot water unit, making sure the absolute pressure is
less than 70Pa, and lasts for 60 minutes.
C. When you have finished the vacuum test, open the check valve to let the
refrigerant go into the ASHP part of the unit.
4 . Installation 4 . Installation
Hot water air source heat pump Hot water air source heat pump