Weil-McLain Electric Water Heater instruction manual Zoning with zone valves

Page 4

PLUS Line Instruction Manual Supplement

PLUS & PLUS WATER HEATERS WITH GAS-FIRED WATER BOILERS

1 Install system water piping (space heating) (continued)

Zoning with zone valves

Figure 2 Zone valve zoning plus optional

1.

Connect boiler to system as shown in Figure 2

water heater piping

 

 

when zone valve zoning. The primary/secondary

 

 

piping shown ensures the boiler loop will have

 

 

sufficient flow. It also avoids applying the high head

 

 

of the boiler circulator to the zone valves.

 

2.

When using a closed-type expansion tank, connect

 

 

the expansion tank and make-up water piping as

 

 

shown in Figure 1, page 3.

 

3.

Connect water heater (domestic hot water) piping

 

 

to indirect storage water heater as shown.

 

 

 

The

PhDControl Module turns off

 

 

 

 

space heating during water heater heating. The boiler circulator will turn off, preventing hot water from circulating to the system. The flow/check valve shown on the boiler outlet piping prevents gravity circulation in the boiler loop during water heater heating.

4.Controlling the system circulator

a.To cycle the system circulator from the Ultra PhD control module, add a circulator relay wired to the boiler circulator terminals as shown on page 8.

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 Ultra-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 2

1Ultra boiler

2Indirect water heater (water heater), if used

3Boiler relief valve (see boiler manual for piping details)

4Relief valve discharge piping (see boiler manual for details)

5Water heater circulator (see page 7 for suggested sizing)

6Isolation valves

7System circulator

8Diaphragm (or bladder) type expansion tank (see page 3 for piping of closed-type expansion tank, if used)

9Air separator [with automatic air vent only on systems using diaphragm (or bladder) type expansion tank]

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

11Purge/drain valves

12Boiler circulator

13Zone valves, typical

20Make-up water supply

21Primary/secondary connection

4

Part number IWHA016A/1103

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Contents Plus Line Contents Hazard definitionsInstall system water piping space heating System water piping methodsBoiler circulator Sizing space heat system pipingZoning with zone valves Connect boiler to system as shown in FigureZoning with circulators Circulator zoning plus optionalCombined space heating/water heating applications Install boiler-to-water heater pipingDedicated water-heating only applications Tables 1 First hour ratings in Tables 1 and 2 are based onField wiring Installation must comply withWiring boiler circulator Wiring Plus circulatorWiring a system circulator Routing line voltage wiringOutdoor temperature sensor Low voltage connections FigLow voltage field wiring connections Start-up Verify operation Plus water heater Operating informationReplace boiler jacket front door Lower room thermostat to stop call for heat

Electric Water Heater specifications

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