9
a) Calorex ‘Pro-Pac’ range heat pumps have water inlet/outlet
connections as follows:
f) When the pipework installation is complete the system
should be run and tested for leaks. If everything is then
working normally the water circulating system is ready to
use.
g) Water circuit to and from unit to be capable of maintaining
within specified limits the rate of flow required by heat
pump (see data sheet).
h) All pipework must be adequately supported with allowance
for expansion/contraction especially with plastic pipework.
i) It is recommended that when installing water system the
last connections to be made in the system should be
breakable couplings to avoid any stresses on to the unit
connections.
Model
Water in/out connection size
Pro-Pac 30
1½" BSPM
Pro-Pac 45
1½" BSPM
Pro-Pac 70
1½" BSPM
Pro-Pac 90
1½" BSPM
Pro-Pac 140
2" BSPM
b) If an existing heater is retained, the Calorex heat pump
should be connected in parallel with it.
c) Suitable breakable couplings, isolating valves and flow
meters should be installed local to the heat pump.
d) Drain valve or plug should be fitted to lower pipe to facilitate
drain down in winter period.
e) The condensate drain at the base of the unit collects
condensation from the evaporator fins. This should be run
away to waste via 1½" domestic waste piping. It is therefore
necessary to ensure that the Calorex heat pump is placed
on a level plinth so that the condensate can run away with
adequate fall to waste i.e. ½" per foot minimum. A U trap
should also be incorporated into the pipework
3. Plumbing
Important note
Maximum pressure of water in heat pump circuit should not exceed 10 bar.
Table 2
4 Typical installation diagram
CALOREX HEAT PUMP
HOT WATER
SUPPLY
HOT WATER
RETURN PUMP
AIR VENT
DRAIN VALVE
STORAGE TANK
CLOSED TYPE
MAKE UP COLD
WATER
Installation cont.
