Crestron electronic 2.5, 3.5 Room air, 4Multiple Vent Terminations must also comply with Figure

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Installation & Operation Manual

4 Sidewall direct venting (continued)

2.Place wall penetrations to obtain minimum clearance of 12 inches (305 mm) between vent pipe and adjacent air inlet, as shown in FIG. 4-4 for U.S. installations. For Canadian installations, provide clearances required by CSA B149.1 Installation Code.

3.The air inlet of a Crest is part of a direct vent connection. It is not classified as a forced air intake with regard to spacing from adjacent boiler vents.

Figure 4-4Multiple Vent Terminations (must also comply with Figure 4-1)

	VENT
	AIR
	12"
36" MIN
48" MAX	36"
	12"
12" MIN

Figure 4-5Direct Vent Terminations

DIRECT VENT TERMINATIONS

Air Inlet	Vent Termination
Dryer Inlet	Straight

Figure 4-6Room Air (Direct Exhaust Terminations)

ROOM AIR (DIRECT EXHAUST TERMINATIONS)

Vent Termination

23° Elbow

45° Elbow

90° Elbow

Room air

The Crest boiler may be installed with a single pipe carrying the flue products to the outside while using combustion air from the equipment room.

Follow the requirements in the General Venting, Sidewall Direct Venting, and Vertical Direct Venting sections for vent material specifications, vent length requirements, and vent termination requirements.

Install the air inlet cover (shipped loose with the boiler) per FIG. 4-7. Combustion and ventilation air must be supplied to the equipment room per the requirements on pages 12 and 13 of this manual for proper operation of the Crest boiler when utilizing the single pipe method.

Figure 4-7Room Air Installation

AIR INLET COVER

90° Elbow

Mitered

23° Elbow

23

Image 23

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 pipingAreas likely to have contaminants When using an existing vent system to install a new boilerProducts to avoid 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 Optional room air General ventingDirect venting 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 20F 40F 60F Circulator sizingModel Near boiler piping components System Multiple Boilers Common Header Primary / Secondary Flow For all equipment and detailing required by local codes Hydronic piping Model Gas Inlet Size Connecting gas supply pipingGas connections Propane Gas Natural gasCheck inlet gas supply GAS Piping Size ChartGas Pressure Gas valve replacementLine voltage connections Field wiringInstallation must comply with 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 operationSet clock Verify HWG circulator mode Set HWG target temperatureConfiguration of the cascade 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