Sterling QVEF User Manual download pdf (Page 8)

Figure 4 - Pipe Installation, Standard Controls

Never use an open ﬂ ame 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*

GasType Natural Gas Propane (LP) Gas

Manifold 3.5 in. W.C. 10.0 in. W.C.

Pressure (0.9 kPa) (2.5 kPa)

14.0 in. W.C. Max. 14.0 in. W.C. Max.

Supply Inlet (3.5 kPa) (3.5 kPa)

Pressure

5.0 in. W.C. Min. 11.0 in W.C. 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 in. W.C. Min. 11.5 in. W.C. 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

(refer to Table 4). A field LP tank regulator must

be used to limit the supply pressure to maximum

of 14 in. W.C. (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. Standard gas duct furnaces, 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 in. N.P.T. 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 QVEF User Manual Page 8

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