23
ixi gas pool and spa heater
Installation Manual
22
ixi gas pool and spa heater
Installation Manual
6.4
Check Valve Installation
When any equipment is located below the surface of
the pool or spa, back-siphoning can occur, which can
draw water backwards through the circulation system.
This can be particularly concerning if chemically
treated water is allowed to flow back into equipment
such as heaters, filters and pumps. Make sure any
chemical feeder or chlorination system outlet lines are
downstream of the heater. Install a positive seal
noncorrosive check valve between the sanitation
equipment and the heater. Always install a check valve
if there is sanitation equipment installed in the system.
Do not
install any shutoff valve in the piping between
the heater outlet and the pool.
WARNING
A check valve can interfere with the proper operation of
certain Suction Vacuum Release System (SVRS) products.
To avoid possible entrapment hazard, serious injury,
or death, make sure to review the operation/owners
manual of your particular SVRS product before installing
the check valve.
6.5
Pressure Relief Valve (PRV) Installation
A pressure relief valve (PRV) is recommended in all
installations, and is mandatory in any installation in
which the water flow can be shut off between the
heater outlet and the pool/spa.
A pressure relief valve is not supplied with the IXI
heater. However, it is recommended that a pressure
relief valve be installed and may be required by local
or national codes. Be sure to check any applicable
installation codes in your area to determine whether
a pressure relief valve is required. If one is required,
it must meet the requirements below and must be
provided and installed by the installer
The maximum working pressure of this heater is
345 kPa (50 psi). Be sure to take into consideration
the maximum allowable pressure of the other
components in the system when installing a PRV.
Any pressure relief valve installed must comply with
provisions of the standard.
Installation procedure will differ depending on which
header type is installed on your heater. See
Figure 14.
• The PRV must be compliant to AS1357.1 or ASME
certifi ed.
• Relief pressure must be at 3.45 bars (50 PSI)
• Minimum rating of 7.77 Kilowatts or 125.8 kg/hr
steam rating.
• Install the PRV so that it is vertical. See
Figure 12.
• Install a drain pipe from the pressure relief valve
outlet to a safe area. This is a precaution to prevent
the possibility of personal injury or property
damage in the event scalding water is discharged
from the pressure relief valve.
• Install the discharge pipe so that there is no
trapped or standing water in the piping. Discharge
piping must be facing down, terminating with
a threadless nipple, no more than 6” and no less
than twice the diameter of the discharge pipe
from the fl oor.
Discharge piping must be open with no
reducers or shut-off valves or other restrictions.
NOTE:
To ensure the continued proper operation of the
pressure relief valve, the valve should be tested once
a year. To test, lift the lever with the circulation system
running to ensure that water will pass through. When the
lever is down, there should be no leaks from the outlet.
Header Type “A”
Header Type “B”
Figure 14.
Header Type
6.5.1
Header Type “A” (PRV) Installation
• Locate the water outlet port on the inlet/outlet
header side of the heater. This is the bottom port
which returns water to the pool and/or spa. See
Figure 16.
NOTE:
PVC and or brass fi ttings must be installed
immediately after the outlet with no valves or other
components in between. The pressure relief valve must
be installed at the outlet port. Do not install at the
header inlet port.
CAUTION
In order to prevent damage, do not tighten with a
wrench. Hand tighten only and use caution not to over-
tighten. Overtightening may crack the header.
Use Tefl on
®
tape
only
on threads mating brass
components to the plastic reducer fi tting. Do not use
any pipe compound or pipe dope on the threads or
any part(s) that come(s) into contact with plastic. These
compounds can damage plastic components over time.
• Using PVC or CPVC plastic pipe and fi ttings, install
a 50 mm (2”) tee. See
Figure 15.
• Install an elbow and a reducer fi tting. Make sure
the internal pipe thread on the reducer fi tting
matches the thread on the pressure relief valve.
