Crestron electronic 3.5, 2.5, 1.5 service manual System

Page 27

Installation & Operation Manual

5 Hydronic piping (continued)

Figure 5-2Single Boiler - Recommended - Primary / Secondary Piping with a Hot Water Generator

HOT WATER

GENERATOR

WATER

GENERATOR

CIRCULATOR

FROM SYSTEM

SYSTEM RETURN

SENSOR

12"

MAX

RELIEF	BALL VALVE
RELIEF	(TYPICAL)
VALVE

AIR SEPERATOR

DRAIN PORT (TYPICAL)

SYSTEM SUPPLY

SENSOR

SYSTEM

CIRCULATOR

			TO SYSTEM
BOILER
DRAIN	PRESSURE		MAKE UP
	REDUCING VALVE	BACK FLOW	MAKE UP
		BACK FLOW	WATER
		PREVENTER	WATER
EXPANSION	PRESSURE	PREVENTER
EXPANSION	PRESSURE
TANK	GAUGE
Y-STRAINER
(RECOMMENDED)
FLOW CHECK
VALVE (TYPICAL)

BOILER PUMP

NOTICE

NOTICE

System flow should always remain higher than the required flow for the boiler(s) when the boiler(s) is in operation to prevent short cycling and high limit issues.

Please note that these illustrations are meant to show system piping concept only, the installer is responsible for all equipment and detailing required by local codes.

27

Image 27

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 pipingWhen using an existing vent system to install a new boiler Products to avoidAreas 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 General venting Direct 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 Circulator sizing Model20F 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 Connecting gas supply piping Gas connectionsModel Gas Inlet Size Propane Gas Natural gasCheck inlet gas supply GAS Piping Size ChartGas Pressure Gas valve replacementField wiring Installation must comply withLine 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 operationVerify HWG circulator mode Set HWG target temperature Configuration of the cascadeSet 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