Crestron electronic 2, 3.5 Gas connections, Connecting gas supply piping, Model Gas Inlet Size

Page 31

6 Gas connections

Connecting gas supply piping

	NOTICE	For dual fuel models, reference the Crest
	NOTICE	Dual Fuel Supplemental Manual.
		Dual Fuel Supplemental Manual.

1.Refer to FIG. 6-1 to pipe gas to the boiler.

a.Install ground joint union for servicing, when required.

b.In Canada – When using manual main shutoff valves, it must be identified by the installer.

Figure 6-1Gas Supply Piping

GAS SUPPLY

UNION

(FACTORY SUPPLIED)

MANUAL SHUTOFF

VALVE (FACTORY SUPPLIED)

SEDIMENT TRAP / DRIP LEG CLEAN OUT (FACTORY SUPPLIED)

2.Support piping with hangers, not by the boiler or its accessories.

The gas valve and blower will not support WARNING the weight of the piping. Do not attempt

to support the weight of the piping with the boiler or its accessories. Failure to comply could result in severe personal injury, death, or substantial property damage.

Installation & Operation Manual

3.Purge all air from the gas supply piping.

4.Before placing the boiler in operation, check the boiler and its gas connection for leaks.

a.The appliance must be disconnected from the gas supply piping system during any pressure testing of that system at a test pressure in excess of 1/2 PSIG (3.5 kPa).

b.The appliance must be isolated from the gas supply piping system by closing a 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).

c.The appliance and its gas connection must be leak tested before placing it in operation.

WARNING Do not check for gas leaks with an open flame – use the bubble test. Failure to

use the bubble test or check for gas leaks can cause severe personal injury, death, or substantial property damage.

5.Use pipe sealing compound compatible with propane gases. Apply sparingly only to male threads of the pipe joints so that pipe dope does not block gas flow.

WARNING Failure to apply pipe sealing compound as detailed in this manual can result in severe

personal injury, death, or substantial property damage.

Table 6A Gas Inlet Size

Model	Gas Inlet Size

FB1500	1 1/2"

FB2000	1 1/2"

FB2500	2"

FB3000	2"

FB3500	2"

31

Image 31

Contents Save this manual for future reference Contents Please read before proceeding When servicing boilerBlowers Crest How it worksCrest How it works Models 1.5 2.0 2.5 3.0 Crest Ahri Rating RatingsProvide clearances Installation must comply withDetermine boiler location Before locating the boiler, checkPrevent combustion air contamination Provide air openings to roomFlooring and foundation Vent and air pipingProducts to avoid When using an existing vent system to install a new boilerAreas likely to have contaminants When removing a boiler from existing common vent system Remove boiler from wood pallet 7Combustion Air from Outside Single Opening Minimum Recommended Combustion AIR Supply to Equipment Room Direct venting General ventingOptional room air Air inlet pipe materials Install vent and combustion air pipingAir intake/vent connections Approved Stainless Steel Vent Manufacturers Make ModelRemoving from existing vent Common venting Prepare roof penetrations Vertical direct ventingVent/air termination vertical Determine location4Alternate Vertical Terminations with Multiple Boilers Multiple vent/air terminationsVent/air termination sidewall Sidewall direct venting2Clearance to Doors and Windows Prepare wall penetrations4Multiple Vent Terminations must also comply with Figure Room airHydronic piping Model Circulator sizing20F 40F 60F Near boiler piping components System Multiple Boilers Common Header Primary / Secondary Flow For all equipment and detailing required by local codes Hydronic piping Gas connections Connecting gas supply pipingModel Gas Inlet Size Propane Gas Natural gasCheck inlet gas supply GAS Piping Size ChartGas Pressure Gas valve replacementInstallation must comply with Field wiringLine voltage connections Low voltage connections EnableOutdoor temperature sensor Louver proving switchSystem supply sensor Auxiliary switch 1Alarm contacts Wiring of the cascadeField WiringCondensate drain Condensate disposalFill and test water system Freeze protection when usedStart-up Check/control water chemistryInspect/check condensate lines and fittings Check for gas leaksCheck thermostat circuits Inspect condensate systemCheck system and boiler Final checks before starting the boilerStart the boiler If boiler does not start correctlyFor Your Safety Read Before Operating Gas Natural Gas Propane Valve Set space heating operationConfiguration of the cascade Verify HWG circulator mode Set HWG target temperatureSet clock General Operating informationProtection features Outdoor reset operation, if used Boiler temperature regulationCascade Sequence of operation Home Screen Crest control module2Main Menu Screen See the Crest User’s Information Manual for Instructions Maintenance Maintenance and annual startupService technician Owner maintenanceMaintenance Check boiler relief valve Flue vent system and air pipingCheck water system Check expansion tankCheck flame signal Check ignition ground wiringCheck all boiler wiring Check control settingsNiosh stated First Aid Cleaning boiler heat exchangerReview with owner Handling ceramic fiber materialsIntegrated Control Diagrams2Wiring Diagram