Sterling QVSF User Manual download pdf (Page 8)

Figure 4 - Pipe Installation, Standard Controls

Never use an open flame to

detect gas leaks. Explosive conditions may exist

which would result in personal injury or death.

The appliance and its individual shutoff valve must

be disconnected from the gas supply piping system

during any pressure testing of that system at test

pressures in excess of 1/2 psig (3.5 kPa).

The appliance must be isolated from the gas supply

piping system by closing its individual manual shutoff

valve during any pressure testing of the gas supply

piping system at test pressures equal to or less than

1/2 psig (3.5 kPa).

Table 4 - Gas Piping Requirements

SINGLE STAGE GAS PIPING REQUIREMENTS*

Gas Type Natural Gas Propane (LP) Gas

Manifold 3.5 inch WC 10.0 inch WC

Pressure (0.9 kPa) (2.5 kPa)

14.0 inch WC Max 14.0 inch WC Max

Supply Inlet (3.5 kPa) (3.5 kPa)

Pressure

5.0 inch WC Min 11.0 inch WC Min

(1.2 kPa) (2.7 kPa)

*For single stage application only at normal altitudes.

TWO STAGE GAS PIPING REQUIREMENTS**

Gas Type Natural Gas Propane (LP) Gas

Supply Inlet 6.5 inch WC Min 11.5 inch WC Min

Pressure (1.6 kPa) (2.9 kPa)

**For two stage applications only at normal altitudes.

PIPE INSTALLATION

1. Install the gas piping in accordance with applicable

local codes.

2. Check gas supply pressure. Each unit heater must

be connected to a manifold pressure and a gas

supply capable of supplying its full rated capacity

(see tabe 4). A field LP tank regulator must be

used to limit the supply pressure to maximum of

14 inch WC (3.5 kPa). All piping should be sized in

accordance with the latest edition of ANSI Standard

Z223.1, National Fuel Gas Code; in Canada,

according to CSA B149. See Tables 1 and 3 for

correct gas supply piping size. If gas pressure is

excessive on natural gas applications, install a

pressure regulating valve in the line upstream from

the main shutoff valve.

3. Adequately support the piping to prevent strain on

the gas manifold and controls.

4. To prevent the mixing of moisture with gas, run

the take-off piping from the top, or side, of the

main.

5. Separated combustion unit heaters optional two-

stage units, and hydraulic modulating units are

supplied with a combination valve which includes:

(a) Manual “A” valve (b) Manual “B” valve

regulator

Pipe directly in to combination valve (see Figure 4).

6. A 1/8 inch NPT plugged tapping, accessible for test

gauge connection, must be installed immediately

upstream of the gas supply connection to the

appliance.

7. Provide a drip leg in the gas piping near the gas

unit heater. A ground joint union and a manual gas

shutoff valve should be installed ahead of the unit

heater controls to permit servicing. The manual

main shutoff valve must be located external to the

jacket. See Figure 4.

8. Make certain that all connections have been

adequately doped and tightened.

Do not overtighten the inlet gas

piping into the valve. This may cause stresses

that would crack the valve!

NOTICE: Use pipe joint sealant resistant to the

action of liquefied petroleum gases regardless of

gas conducted.

Check all pipe joints for leakage

using a soap solution or other approved method.

Never use an open flame or severe personal

injury or death may occur.

D3631C

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Sterling QVSF User Manual Page 8

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