Pentair PowerMax Gas Connections, Gas Line Installations, externally to the heater

Installation (contd.) 16

GAS CONNECTIONS

Pipe Sized For Length Of Run In Equivalent Feet Table 7.

1/2 in.

3/4 in.

1 in.

1¼ in.

1½in.

2 in.

GAS LINE INSTALLATIONS

Model

Nat

LP

Nat

LP

Nat

LP

Nat

LP

Nat

LP

Nat

LP

Before installing the gas line, be sure to

150

10'

40'

50'

150'

150'

600'

-

-

-

-

-

-

check which gas the heater has been

195/200

-

20'

30'

80'

125'

250'

450'

600'

-

-

-

-

designed to burn. This is important

because different types of gas require

250

-

10'

20'

50'

70'

150'

250'

500'

600'

-

-

-

different gas pipe sizes. The rating plate

300

-

-

10'

30'

50'

100'

200'

350'

400'

600'

-

-

on the heater will indicate which gas the

350

-

-

10'

20'

30'

70'

125'

250'

250'

500'

500'

-

heater is designed to burn. Table 7,

400

-

-

-

10'

20'

60'

100'

150'

200'

450'

400'

-

shows which size pipe is required for the

REGULATED MANIFOLD PRESSURE TEST

distance from the gas meter to the heater. The table

1. Attach the manometer to the heater jacket.

is for natural gas at a specific gravity of .65 and

propane at specific gravity of 1.5.

2.

Shut off the main gas valve.

3.

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

When sizing gas lines, calculate three (3) additional

valve and screw in the fitting from the manometer kit.

feet of straight pipe for every elbow used.

4. Connect the manometer hose to the fitting.

When installing the gas line, avoid getting dirt,

5.

Fire the heater.

6.

The manometer must read 4 in. WC for natural gas,

grease or other foreign material in the pipe as this

11 in. WC for propane gas, while the heater is

may cause damage to the gas valve, which may

operating.

result in heater failure.

7.

For adjustment, remove the Regulator Adjustment

The gas meter should be checked to make sure that

Cap and using a screwdriver turn the screw clock-

wise to increase - counterclockwise to decrease gas

it will supply enough gas to the heater and any other

pressure.

Regulator Adjustment Cap

appliances that may be used on the same meter.

1/8" NPT Plug

(Inlet Press)

The gas line from the meter will usually be of a

Figure 16.

larger size than the gas valve supplied with the

ON

heater. Therefore a reduction of the connecting gas

OFF

pipe will be necessary. Make this reduction as close

1/8" NPT Plug

to the heater as possible.

(Manifold Press)

ADJUSTMENT CAP

REGULATOR

The heater and any other gas appliances must be

disconnected from the gas supply piping system

Figure 17.

during any pressure testing on that system, (greater

PILOT

that ½ PSIG).

HONEYWELL

1/2 P.S.I.

PRESS

PILOT

TAP

ADJ.

The heater and its gas connection must be leak

tested before placing the heater in operation. Do not

CAUTION

use flame to test the gas line. Use soapy water or

The use of Flexible Connectors (FLEX) is NOT

another nonflammable method.

recommended as they cause high gas pressure drops.

A manual main shut-off valve must be installed

MINIMAX PLUS GAS PRESSURE REQUIREMENTS*

externally to the heater.

WARNING

Do not install the gas line union inside the heater cabinet. This will void your warranty.

P/N 471048

	Natural	Propane
Maximum inlet gas pressure	10 in. WC	14 in. WC
Minimum inlet gas pressure	**5 in. WC	12 in. WC
Normal manifold pressure	4 in. WC	11 in. WC
** 6 WC for 400 model
*All Readings are taken with the heater fired. Any adjustments
made with heater off will give incorrect readings.
Table 8.
	Rev. G 1-22-04