Plumbing
The heater requires water flow and pressure to operate
properly. It must therefore be installed downstream of
the filter and pump. A typical installation is plumbed as
follows:
1.
The Pump outlet is plumbed to the inlet of the Filter.
2.
The outlet side of the Filter is then plumbed to the
inlet of the Heater.
3.
The outlet of the Heater is plumbed to the return line
to the pool or spa. The Pump, Filter and Heater are
plumbed in series.
Plumbing from the heater back to the pool must not
have any valves or restriction that could prevent flow
when the pump is operating. If it is necessary to install
a valve on the return to the pool then it is essential that
a flow switch is installed and interlocked with the
Heater supply.
The Heater must be located so that any water leaks will
not damage the structure of adjacent area. There is no
requirement for heat shunt connections to the Heater,
plumbing can be made in standard plastic 1½” pipe
from the supplied demountables
Use the pressure loss chart on page 5 to specify a
suitable pump.
Connection to the Heater can be made from either
the left or the right, it is supplied to be connected on
the left. To change, undo the demount connection on
the
right,
complete with blanking plates, and swap
with the connections on the
left.
Flow Rate
The Heaters are built with an internal fixed bypass
that ensures the correct flow through the heat
exchanger for a wide range of conditions.
The minimum permitted flow is: 80 litres/min
Pressure Switch
The Heater is protected by an adjustable water
pressure switch that has to close before the Heater
will operate. It is very important to verify that it turns
off when the water flow is interrupted.
It has an adjustment range equivalant to
±
1.5
metres. The switch is factory set for most conditions
but can be altered if required:
1.
With the pump on turn the knurled nut clockwise
until a click is heard.
2.
Turn the nut anti-clockwise a quarter of a turn.
3.
Turn the pump on and off to check the switch
operates correctly.
NG to LPG Conversion
The Heater can be converted to LPG on site. It
should be done before the Heater is piped to its
supply.
1.
With the Gas and Electrical supply off, undo
the three screws that hold the Venturi to the
Gas Valve. (
See Fig.6.0
)
2.
Allow the Gas valve to drop and gently hang
on its cables.
3.
Fit the Conversion Orifice into the Rubber
Seal that sits in the Gas Valve. (
See Fig.6.1
)
4.
Re-assemble the Gas Valve and Venturi.
5.
Affix the new Propane Serial Number Data
Label supplied over the existing.
LPG to NG Conversion
The method is as detailed above except the Orifice is
removed and the Venturi and Gas Valve reassembled
with just the Rubber Seal between them. A new Serial
Number Data Label should be obtained from the
manufacturer and affixed over the existing.
Gas Connection
The 22mm copper gas connection provided can be
positioned to exit the Heater from either the left or
the right. A minimum of 20mb. (NG), 37mb (LPG)
must be available at the Heater inlet, with the Heater
and other connected appliances firing. Check for gas
tightness (B.S. 6891: 1988) in pipework to boiler
using a manometer.(
See Fig. 6.2
) Gas soundness
within the Heater should be checked using sense of
smell and leak detection fluid. Check the maximum
rate and combustion are to specification,
(See Datatable Inside Cover.)
Condensing Pool Heater
12
14/11/06
Fig. 5.1
