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23.Connect the white wire labeled PS to the pressure switch and the other white wire to its original location on the Fireman's switch.
24.Replace jacket/plugs grommets, and
25.Install the flue collector assembly. Be sure the bottom lips are inside the grooves on the front and rear tile covers and are not pinching any wires.
26.Reconnect yellow wires (Model LLG only) to redundant limit fuse on the flue collector.
27.Attach the flue collector holddown clamps to the clips located under the two center header bolts.
28.Replace the gap closures and tighten the screws securely.
29.
30.
31.
32.Replace the top assembly. Make sure the tabs are outside the heater jacket. Fasten the top assembly with the
33.Install plastic tie wraps on wiring.
34.Install heater door.
35.Reinstall the vent cap or drafthood, if one was removed.
2G-3. Check Valve Installation
Install a check valve if there is any chance of back- siphoning when the pump stops. Do not install any other valve in the piping between the heater outlet and the pool, unless it is being used as a diverter valve.
2G-4. Chlorinators, Ozone Generators,
and Sanitizing Chemicals
The Teledyne Laars Lite heater is manufactured with materials that are not compatible with high concentrations of ozone, chlorine, bromine, or other sanitizing chemicals. Heater damage caused by exces- sive chemicals or improper ozonation is not covered by the Teledyne Laars warranty. Be sure to adhere to the following:
•When ozone is injected upstream of the heater, install an offgas mixing chamber, or an ozone bypass system between the heater and the ozone
injector to prevent ozone and air from entering the heater.
•When chemical feeders are used, plumb the feeder downstream of the heater and install an inline check valve between the heater and the feeder (a minimum of 18" is required between the heater and the check valve).
•Never deposit chemicals directly in the pool skimmer.
2G-5. Pressure Relief Valve
A pressure relief valve is not furnished with the Laars Lite heater, except in Canada, however, it is recommended and may be required by local codes.
To install a pressure relief valve, remove the 3/4 inch (19 mm) brass plug on the in/out header with the valve (see Figure 16). The setting of the valve should be at or below the lowest working pressure of filter system components.
2G-6. Adjusting the Pressure Switch
Caution
The pressure switch should be adjusted to turn the heater off when the pump is off. Setting the switch to close at too low of a flow can damage the appliance. Adjust the switch to turn the heater off, not on.
The pressure switch is preset at the factory for activation at 2 psi (14 kPa). Adjust the pressure switch only if any part of the filter system piping is 3 feet (0.91 m) or more above the top of the heater jacket.
Do not adjust the pressure switch if the heater is installed more than 15 feet (4.57 m) below or 6 feet (1.83 m) above the pool surface. Consult your local Teledyne Laars representative for recommendations.
On some installations, the piping from the heater to the pool is very short. The back pressure could be too low to trigger the pressure switch. If this happens, it may be necessary to install a directional fitting or elbows where the return line enters the pool. This will increase back pressure enough for the heater to operate properly.
Make sure the pool filter is clean before making any pressure switch adjustment: A dirty filter will restrict the water flow and the pressure switch cannot be adjusted properly. To adjust the pressure switch:
1.Turn the control panel rotary switch to OFF (see Figure 17).
2.Turn filter pump on. If a
(NOTE: Heater should not be allowed to fire on low speed).
