Desa Tech CGN20TA Checking GAS Connections, Pressure Testing GAS Supply Piping System

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OWNER’S MANUAL

CHECKING GAS CONNECTIONS

WARNING: Test all gas pip- ing and connections for leaks after installation or servicing. Correct all leaks at once.

WARNING: Never use an open flame to check for a leak. Apply a mixture of liquid soap and water to all joints. Bubbles forming show a leak. Correct all leaks at once.

PRESSURE TESTING GAS SUPPLY PIPING SYSTEM

Test Pressures In Excess Of 1/2

PSIG

1.Disconnect heater and its individual manual shutoff valve from gas supply piping system. Pressures in excess of 1/2 psig will damage heater regulator.

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

3.Pressurize supply piping system by ei- ther using compressed air or

opening main gas valve located on or near gas meter.

4.Check all joints of gas supply piping system. Apply mixture of liquid soap and water to gas joints. Bubbles form- ing show a leak.

5.Correct all leaks at once.

Test Pressures Equal To or Less Than 1/2 PSIG

1.Close manual shutoff valve (see Fig- ure 14).

2.Pressurize supply piping system by ei- ther using compressed air or opening main gas valve located on or near gas meter.

3.Check all joints from gas meter to manual shutoff valve (see Figure 15). Apply mixture of liquid soap and wa- ter to gas joints. Bubbles forming show a leak.

4.Correct all leaks at once.

Manual

Open

Shutoff

 

Valve

 

Closed

Figure 14 - Manual Shutoff Valve

Gas Meter

PRESSURE TESTING

HEATER GAS

CONNECTIONS

1.Open manual shutoff valve (see Fig- ure 14).

2.Open main gas valve located on or near gas meter.

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

4.Check all joints from manual shutoff valve to thermostat gas valve (see Fig- ure 15). Apply mixture of liquid soap and water to gas joints. Bubbles form- ing show a leak.

5.Correct all leaks at once.

6.Light heater (see Operating Heater, pages 12 and 13). Check the rest of the internal joints for leaks.

7.Turn off heater (see To Turn Off Gas to Appliance, page 12).

8.Replace front panel.

Thermostat Gas Valve

Manual

Shutoff

Valve

Figure 15 - Checking Gas Joints

104190

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Contents What to do if YOU Smell GAS Blue Flame VENT-FREE Natural GAS HeaterCGN20TA Safety InformationUnpacking Product FeaturesProduct Identification Local CodesConfined and Unconfined Space Fresh AIR for Combustion and VentilationProviding Adequate Ventilation Unusually Tight ConstructionDetermining if You Have a Confined or Unconfined Space Determining FRESH-AIR Flow for Heater LocationVentilation Air From Outdoors Ventilation AIRVentilation Air From Inside Building Locating Heater InstallationInstallation Items Check GAS TypeThermostat Sensing Bulb Installing Heater to WallPlacing Heater On Mounting Bracket Installing Bottom Mounting ScrewsAttaching Mounting Bracket To Wall Typical Inlet Pipe Diameters Connecting to GAS SupplyTest Pressures In Excess Of 1/2 Pressure Testing GAS Supply Piping SystemPressure Testing Heater GAS Connections Checking GAS ConnectionsTo Turn OFF GAS To Appliance For Your Safety Read Before LightingOperating Heater Lighting InstructionsPilot Flame Pattern Manual Lighting ProcedureInspecting Burner Thermostat Control OperationObserved Problem Possible Cause Remedy TroubleshootingMaintenance, Gas leak. See Warning statement at Service Hints Cleaning and Maintenance SpecificationsService Publications Replacement Parts Technical ServiceFBD Parts CentralsManual Shutoff AccessoriesFAN Kits GA3100A and GA3200TA CGN20TA Illustrated Parts BreakdownKEY Part Number Description QTY Parts ListCGN20TA 104190 Warranty Information