Weil-McLain 105, 80, 230, 310, 155 manual Chilled water systems, Chilled water system plus optional

Page 18

3 GAS-FIRED WATER BOILER — Boiler Manual

Install water piping (continued)

Chilled water systems

Figure 10 Chilled water system plus optional

1. Install boiler so that chilled medium is piped in parallel with the heating

DHW piping

 

boiler. Use appropriate valves to prevent chilled medium from entering

 

boiler. See Figure 10 for typical installation of balancing valve and check

 

valve.

 

2. The space heating system may be zoned with circulators if a separate

 

circulator is supplied for the chilled water loop.

 

3. If boiler is connected to heating coils located in air handling units where

 

they can be exposed to refrigerated air, use flow control valves or other

 

automatic means to prevent gravity circulation during cooling cycle.

 

 

Follow these piping guidelines below to ensure chilled water

 

 

 

 

does not enter the boiler loop.

 

 

 

 

Chilled medium, if used, is piped in parallel with heating boiler

 

 

 

 

as shown in Figure 10. Use appropriate valves to prevent chilled

 

 

medium from entering boiler.

 

 

If boiler is connected to heating coils located in air handling

 

 

units where they can be exposed to refrigerated air, use flow

 

 

control valves or other automatic means to prevent gravity

 

 

circulation during cooling cycle.

 

NOTE 1: To ensure adequate flow rate through the boiler, use the following

 

pipe size on all boiler loop piping (connecting boiler to and from

 

the primary/secondary connection, item 21):

 

Ultra-80 or Ultra-105 – 1" or larger.

 

Ultra-155 or -230 – 1¼" or larger.

 

Ultra-310 – 1½" or larger.

 

 

Use at least the minimum piping size above and pipe the boiler

 

 

 

 

using only primary/secondary piping as shown. Failure to

 

 

 

 

follow these guidelines could result in system problems.

 

Legend

Figure 10

 

 

1

Ultra boiler

 

12

Boiler circulator

2

Indirect water heater (DHW), if used

13

Zone valves, typical

3

Boiler relief valve (see page 12 for piping details)

15

Closed-type expansion tank

4

Relief valve discharge piping (see page 12 for details)

16

Water chiller

5

DHW circulator (see page 14 for suggested sizing)

17

Check valve

6

Isolation valves

18

Strainer

7

System circulator

19

Balancing valve

9

Air separator (DO NOT use automatic air vents on systems fitted with closed-

20

Make-up water supply

 

type tanks)

21

Primary/secondary connection

 

 

 

10Flow/check valves (with weighted seats to prevent gravity circulation)

11Purge/drain valves

18

Part number 550-101-233/0903

Image 18
Contents Gas-fired water boiler HOW IT Works GAS-FIRED Water BOILER, with PhD Technology Contents Hazard definitionsBoiler operation When servicing boilerPlease read before proceeding Boiler waterBefore locating the boiler, check Installations must comply withPrepare boiler location Provide clearancesProvide air openings to room Residential garage installationFlooring and foundation Vent and air pipingWhen removing a boiler from existing common vent system Prevent combustion air contaminationSeal any unused openings in the common venting system Prepare boiler Remove boiler from cratePrepare for propane if operating on propane Ultra-80 Placing wall-mounted boilers Prepare for propane if operating on propane Ultra-155 toPlacing floor-mounted boilers Set boiler in place and check levelFill and pressure test Perform hydrostatic pressure testPrepare boiler for test Drain and remove fittingsAdditional controls, when required Install water pipingInstall relief valve General piping informationSystem water piping methods CirculatorsSizing space heat system piping Sizing DHW system piping Required boiler water flow rate, GPM, at 180FZoning with zone valves Connect boiler to system as shown in whenControlling the system circulator Zoning with circulators Setting boiler outlet water target temperature Radiant heating applicationsChilled water systems Chilled water system plus optionalInstall vent and combustion air piping Venting, combustion air & condensate linePrepare condensate fittings Connect condensate drain Condensate drain Ultra-80Connecting gas supply piping Gas pipingWall-mounted boilers Pipe sizing for natural gas Natural GasPropane Gas Natural gas supply pressure requirementsCheck/control water chemistry Freeze protection when usedStartup Fill and test water systemInspect/fill condensate system Check for gas leaks Final checks before starting boilerCheck thermostat circuits To start the boilerAdjust and test boiler controls Check system and boilerCheck flame & combustion Check-out/startup verification Check-out/startup verification Installation certificate Annual startup and general maintenance Service and maintenance schedulesAnnual startup Handling ceramic fiber materialsCheck all piping for leaks Check expansion tank Clean condensate trapCheck water system Check air openingsCheck control settings Check ignition ground wiringCheck all boiler wiring Check boiler relief valvePerform startup and checks Check flame signalCheck flue gas temperature Check burner flameCleaning boiler heat exchanger Maintenance generalGeneral maintenance Replace boiler jacket front door after startup or servicingMaintenance and annual startup Access exchanger Ultra-155, -230, -310 OnlyExchanger cleaning ALL models Replacement parts Jacket parts Replacement parts Heat exchanger and piping Ultra-80 Replacement parts Heat exchanger and piping Ultra-155 to Replacement parts Controls Dimensions Ratings DOE
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