Pentair 75 User Manual download pdf (Page 15)

Rev. E 5-16-01 P/N 471105

GAS CONNECTIONS

REGULATED MANIFOLD

PRESSURE TEST

1. Attach the manometer to the heater jacket.

2. Shut off the main gas valve.

3. Remove 1/8" NPT plug on the outlet side of the

valve and screw in the fitting from the manometer

kit.

4. Connect the manometer hose to the fitting.

5. Fire the heater.

6. The manometer must read 4" WC for natural gas,

11" WC for propane gas, while the heater is

operating.

7. For adjustment, remove the Regulator Adjustment

Cap and using a screwdriver turn the screw

clockwise to increase - counterclockwise to

decrease gas pressure; see Figure 13.

GAS LINE INSTALLATIONS

Before installing the gas line, be sure to check which gas

the heater has been designed to burn. This is important

because different types of gas require different gas pipe

sizes. The rating plate on the heater will indicate which

gas the heater is designed to burn. Table 3 shows which

size pipe is required for the distance from gas meter to the

heater. The table is for natural gas at a specific gravity of

.65 and propane at specific gravity of 1.5.

When sizing gas lines, calculate three (3) additional feet

of straight pipe for every elbow used.

When installing the gas line, avoid getting dirt, grease or

other foreign material in the pipe as this may cause damage

to the gas valve, which may result in heater failure.

The gas meter should be checked to make sure that it will

supply enough gas to the heater and any other heaters that

may be used on the same meter.

The gas line from the meter will usually be of a larger size

than the gas valve supplied with the heater. Therefore a

reduction of the connecting gas pipe will be necessary.

Make this reduction as close to the heater as possible.

The heater and any other gas appliances must be

disconnected from the gas supply piping system during

any pressure testing on that system, (greater that ½ PSIG).

The heater and its gas connection must be leak tested

before placing the heater in operation. Do not use flame

to test the gas line. Use soapy water or another nonflam-

mable method.

A manual main shutoff valve must be installed

external to the heater.

Installation (contd.)

Figure 13.

Maximum inlet gas pressure 10" WC 14" WC

Minimum inlet gas pressure 5" WC 12" WC

Normal manifold pressure 4" WC 11" WC

* All Readings are taken with heater fired. Any

adjustments made with heater off will give

incorrect readings.

PENTAIR POOL PRODUCTS GAS

PRESSURE SETTINGS*

Table 4.

Pipe Sized For Length Of Run In Equivalent Feet

Table 3.

1"3/4"1/2"

Model Nat LP Nat LP Nat LP

100 DSI 20' 50' 50' 150' 150' 600'

100 MV 20' 50' 50' 150' 150' 600'

75 20' 50' 50' 150' 150' 600'

Do not install the gas line union inside the heater

cabinet. This will void your warranty.

WARNING

CAUTION

Natural Propane

Maximum inlet gas pressure 10" WC 14" WC

Minimum inlet gas pressure 5" WC 12" WC

Normal high altitude 3" WC 7" WC

manifold pressure

Natural PropaneHigh Altitudes

(2500-7000 ft. Above Sea Level)

Normal Altitudes

(0-2500 ft. Above Sea Level)

The use of Flexible Connectors (FLEX) is NOT

recommended as they cause high gas pressure drops.

VENT

egulator A

djustm

ent C

Regulator Adjustment Cap

SIT valve

Robertshaw

valves

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 23 24

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