Installation

Continued

CHECKING GAS CONNECTIONS

WARNING: Test all gas piping and connections, internal and external to unit, for leaks after installing or servicing. Correct all leaks at once.

WARNING: Never use an open flame to check for a leak. Apply a noncorrosive leak detec- tion fluid to all joints. Bubbles forming show a leak. Correct all leaks at once.

CAUTION: Make sure exter- nal regulator has been installed between propane/LP supply and heater. See guidelines un- der Connecting to Gas Supply, page 14.

Pressure Testing Gas Supply

Piping System

Test Pressures In Excess Of 1/2 PSIG

(3.5 kPa)

1. Disconnect appliance with its appliance main gas valve (control valve) and equipment shutoff valve from gas supply piping system. Pressures in excess of 1/2 psig will damage heater regulator.

Test Pressures Equal To or Less Than 1/2

PSIG (3.5 kPa)

1. Close equipment shutoff valve (see Figure 17).

2. Pressurize supply piping system by either opening propane/LP supply tank valve for propane/LP gas or opening main gas valve located on or near gas meter for natural gas or using compressed air.

3. Check all joints from gas meter to equipment shutoff valve for natural gas or propane/LP supply to equipment shutoff valve for pro- pane/LP (see Figure 18 or 19, page 17). Apply noncorrosive leak detection fluid to all joints. Bubbles forming show a leak.

4. Correct all leaks at once.

Pressure Testing Heater Gas

Connections

1. Open equipment shutoff valve (see Figure 17).

2. Open main gas valve located on or near gas meter for natural gas or open propane/LP supply tank valve.

3. Make sure control knob of heater is in the OFF position.

4. Check all joints from equipment shutoff valve to thermostat gas valve (Thermostat-Con- trolled Models) or to gas control (Remote- Ready Models) (see Figure 18 or 19, page 17). Apply noncorrosive leak detection fluid to all joints. Bubbles forming show a leak.

5. Correct all leaks at once.

6. Light heater (see Operating Heater, page 20 or 22, depending on your model). Check all other internal joints for leaks.

7. Turn off heater (see To Turn Off Gas to Appli- ance, page 21 for Thermostat-Controlled mod- els or page 23 for Remote-Ready Models).

2. Cap off open end of gas pipe where equipment shutoff valve was connected.

3. Pressurize supply piping system by either opening propane/LP supply tank valve for propane/LP gas or opening main gas valve located on or near gas meter for natural gas or using compressed air.

Equipment

Shutoff

Valve

Open

4. Check all joints of gas supply piping system. Apply noncorrosive leak detection fluid to all joints. Bubbles forming show a leak.

5. Correct all leaks at once.

6. Reconnect heater and equipment shutoff valve to gas supply. Check reconnected fittings for leaks.

Closed

Figure 17 - Equipment Shutoff Valve

16

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Desa VUL18, VUL24, VUL30, P)T, P)R, HRB3624 Checking GAS Connections, Test Pressures Equal To or Less Than 1/2 Psig 3.5 kPa

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