Lochinvar GAS HEATER FOR COMMERICAL POOL APPLICATIONS User Manual download pdf (Page 27)

2. Isolate the pool heater from the gas supply piping system

by closing a manual shutoff valve during any piping

system pressure testing that is equal to or less than 1/2

PSIG (3.5kPa).

3. Test all gas connections for gas leaks before placing the

pool heater in operation.

Gas Piping

To safely operate this pool heater, you must properly size the

gas supply piping. See Tables- J and K for piping and fitting

requirements. Gas pipe size may be larger than pool heater

connection.

On models 500,000 - 750,000 Btu/hr the gas connection to the

pool heaters are 1 1/4" NPT and on models 990,000 -

2,070,000 Btu/hr the gas connections to the pool heaters are

2" NPT.

IMPORTANT: Do not block access to the

electrical cover plate when installing the

sediment trap. The sediment trap must be a

minimum of 12 inches from the pool heater.

Optional gas controls may require routing of bleeds and vents

to the atmosphere, outside the building when required by local

codes.

Note: All secondary regulators MUST BE of the lock-up type

and spaced a minimum of 6' from the appliance.

Connecting Gas Piping to the Pool

Heater

All gas connections must be made with pipe joint compound

resistant to the action of liquefied petroleum (L.P.) and natural

gases. All piping must comply with local codes and

ordinances. Piping installations must comply with approved

standards and practices.

1. Make sure the gas line is a separate line direct from the

meter unless the existing gas line is of sufficient capacity.

Verify pipe size with your gas supplier.

2. Use new, properly threaded black iron pipe free from chips.

If you use tubing, make sure the ends are cut square,

deburred and clean. Make all tubing bends smooth and

without deformation. Avoid flexible gas connections.

Internal diameter of flexible lines may not provide the pool

heater with the proper volume of gas.

3. For ease of service, install a union.

4. Install a manual main gas shutoff valve at the pool heater’s

gas inlet, outside of the pool heater in accordance with the

National Fuel Gas Code, ANSI Z223.1, this must be

installed within 6 feet of the pool heater.

Figure 28 – Gas Line Connection

5. Run pipe or tubing to the pool heater’s gas inlet. If you use

tubing, obtain a tube to pipe coupling to connect the tubing

to the pool heater’s gas inlet.

6. Install a sediment trap in the supply line to the pool

heater’s gas inlet (see Figure 28).

7. Apply a moderate amount of good quality pipe compound

(do not use Teflon tape) to pipe only, leaving two end

threads bare.

8. Remove the seal over the gas inlet to the pool heater.

9. Connect the gas pipe to the inlet of the pool heater. Use a

wrench to support the gas manifold on the pool heater.

10. For L.P. gas, consult your L.P. gas supplier for expert

installation.

11. Ensure that all air is completely bled from the gas line

before starting the ignition sequence. Start up without

properly bleeding air from the gas line may require

multiple reset functions of the ignition control module to

achieve proper ignition.

 WARNING: Do not have any open flame in

proximity to the gas line when bleeding air from

the gas line. Gas may be present.

Gas Train and Controls

Note: The gas train and controls assembly provided on this

pool heater have been tested under the applicable American

National Standard to meet minimum safety and performance

criteria such as safe lighting, combustion and safety shutdown

operation.

Installation and Service Manual

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