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Installation and Operation Manual
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Legacy™ Model LRZM Pool/Spa Heater
section 7. Commissioning
7.1
Heater start-up
1. When the heater has lit, remove the service door
and check all gas connections for soundness with
leak detection fluid.
2. Check the manifold (burner) pressure setting and
adjust as necessary (see Table 1).
3. Start the adjustment procedure with the heater
cold, on full load, and with the temperature
control set at maximum. This will ensure, as far
as possible, that thermostatic shutdown does not
interfere while the pressure is being checked and
adjusted.
4. Remove the blanking screw in the manifold
(burner) setting pressure test nipple (see Figure
17) and securely connect a suitable gas pressure
gauge.
5. Light the heater and allow it to operate for about
15 minutes to stabilize the burners.
6. Check the pressure and adjust it for the appro-
priate heater size. Refer to Table 2. The burner
pressure setting adjuster is found on the gas
control (valve).
7. Remove the dust cover over the adjuster and,
using a screwdriver, turn the screw beneath
clockwise to increase or anti-clockwise to
decrease the pressure. Replace the dust cover
when finished.
8. Turn off the burner, disconnect the gas pressure
gauge, and replace the blanking screw in the
burner setting pressure test nipple.
9
Relight and check for gas soundness.
10. For heaters installed with a draft hood, perform
a spillage test in accordance with BS.5440:1 to
check for spillage of combustion products from
the heater draft diverter.
11. Check that the main burner responds correctly to
manual ON/OFF operations of any controls fitted
in the gas control circuit.
12. Check the operation of the flame failure safety
device using the following steps:
a. Extinguish the main burner and pilot burner
by turning off the main gas inlet cock.
b. Check that the flame failure device is heard
to close within one (1) minute.
c. Wait three (3) minutes, then turn on the gas
and re-light the pilot.
13. With the pump running, check for water leaks in
the heat exchanger or water piping.
14 Adjust the water pressure switch according to the
procedure in Section 11.5.
15. Perform a temperature rise test acording to the
procedure in Section 11.6.
16. Refit the service door and return all controls to
the required settings.
section 8. operating instructions
8.1
normal operation
WarninG
Improper installation or maintenance can cause
nausea or asphyxiation from carbon monoxide in
flue gases which could result in severe injury, or
death. For indoor installations, as an additional
measure of safety, Zodiac strongly recommends
installation of suitable Carbon Monoxide detectors
in the vicinity of this appliance and in any adjacent
occupied spaces.
The Legacy model LRZ millivolt heaters are
capable of automatic operation based on a call for
heat at a preset temperature. The heater has an inter-
nal safety system which allows operation in a variety
of conditions and prevents operation when certain
adverse conditions are encountered.
When the heater's pilot is lit and the pilot
generator is providing a millivolt signal to the safety
circuit, water is flowing through the heater, and the
temperature of the water entering the heater is below
Pressure Test Nipple
with Blanking Screw
Inlet Gas Pressure
Test Point
Burner Pressure
Adjustment
Figure 17. lighting the pilot
Summary of Contents for Legacy LRZ
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