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SD092750 ISSUE 34
3. Plumbing
a) The Calorex Variheat Heat Pump must be
connected after the filter in the return pipe to the
pool. If an existing heater is being retained, then
the Calorex unit should be connected between
the filter and the other heater, see figure 6.
b) Calorex heat pumps have water inlet/oulet
connections as follows:
Models 550,800,1200 1½” BSP parallel, female.
Models 1400, 1800 & 4000 1½” BSP parallel,
male.
c) Suitable breakable couplings should be
installed local to heat pump.
d) If heat pump installed at lower level than pool
water then isolation valves should be fitted.
e) Drain valve or plug should be fitted to lower to
facilitate completedrain down in winter period.
f) Connections on all models from 550 to 1200 are
by parallel male fittings sealed by 'O' ring or
silicone mastic these should be
hand tightened
only
, otherwise damage may result to the
threads.
Note:
Do not route pipes across service panels or
Air In/Outlet
g) The heat exchanger in the Heat Pump will, on
small pools, take the full flow rate of the
recirculating system (see Figure 6). On larger
pools a by-pass or separate auxiliary pump
may be necessary. (bypass 1½ hp or larger
water pumps) see Figures 7 and 8.
h) The condensate drain at the base of the unit
collects the condensation from the evaporator
fins. It is therefore necessary to ensure
that the Calorex is placed on a level plinth so
that the condensate water can run away and not
overflow the edges of the drip-tray inside the
machine.
Models 550,800,1200
drain connection to waste via 22mm push fit
domestic waste system.
Models 1400, 1800 and 4000
drain connection to waste via ¾2 & 1½” BSPM
stubs respectively.
N.B Hose must be a watertight fit.
i) When the pipework installation is complete the
pool pump should be switched on and the
system tested for leaks. Also check the filter
gauge to see that there is not an excessive
increase in back pressure. If everything is then
working normally the water circulating system is
ready to use.
j) 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).
k) 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 the breakable connections to avoid any
stresses on to the unit connections.
m)To ensure efficient operation of the Heat Pump, an
adequate constant flow of water is required through
the condenser.
This is normally achieved by ensuring that the filter
pump is always operating at the same time as the
Heat Pump but this requires consumption of electricity
which would not normally be used during the filter ‘off
cycle’ period.
To reduce energy consumption the installation of a two
speed or small auxillary water pump (by-passing the
filter) should be considered. This method should only
be used on heavily used pools (4 hours turnover or
less to reduce the risk of overheating due to main
pump heat input.
The circuit can be incorporated in the initial installation
or added to an existing standard circuit.
IMPORTANT
1) The Calorex unit must never be connected in such a
way that the Heat Pump can be switched on without
adequate water flow through the condenser.
Integral interlock terminals provided on all models
(see figure 9).
2) All Pool Purifying Devices and Chemical Injection
Systems to be fitted down stream of heat pump with a
non return valve to prevent concentrated chemicals
back feeding into the heat exchanger. The practice of
dosing chemicals direct into Skimmer Basket, which
results in concentrated corrosive liquids passing over
vulnerable metal components must not be allowed.
3) Water quality must be maintained not only related to
solids, etc, but also pH between 7,4 ±0,4 and, if pool
water is saline at maximum concentration of 6% wt/wt.
4) Maximum pressure of water in heat pump circuit id
3kg/cm².
(140psi) 1400, 1800,4000 models.
