Weil-McLain 550-141-850/0599 manual IIIg Water piping single-zone radiant or heat pump system

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• Installation • Start-Up • Parts • Maintenance

IIIg Water piping — single-zone radiant or heat pump system

Single-zone radiant heating or heat pump

piping

Radiant heating systems and heat pump systems usually require system supply water temperatures below 130 °F. But the boiler outlet water temperature will be at least 150 °F during most operating conditions. So the piping must include a method of reducing the supply water temperature to the system.

Figure 13 uses two balancing valves to manually adjust the supply water temperature. Follow the instructions below to adjust these valves. Install the supply temperature limit control (item 14) as shown to protect the system from overtemperature conditions. Note also that this piping requires a separate system circulator, as shown, because of the higher flow rates of radiant and heat pump systems.

Manual adjustment of the supply temperature is limited to single-zone systems because multi-zone systems will cause varying loads, making it unlikely an acceptable valve setting could be found. See Figure 14a or 14b for multi- zone systems.

Figure 13 Single-zone radiant heating or heat pump system

Load

You may also apply the suggested piping of either Figure 14a or 14b if you want automatic supply temperature regulation or outdoor reset temperature control.

For additional information and alternatives in piping for radiant heating systems, refer to Weil-McLain

AlumiPex Controls • Pumps • Wiring Design Guide.

Adjust balancing valves

Use valves 15 and 16 to mix boiler supply water with system return water, reducing supply water temperature to the system.

1.Subtract the design system supply temperature from 150 °F. Call this number the temperature difference.

2.Open valve 16 and close valve 15.

3.Start the boiler and system.

4.Let the system warm up for about 15 minutes.

5.Note the temperature at gauge 9 (system supply) and gauge 8 (boiler supply).

6.Slowly close valve 16 while opening valve 15 until gauge 9 reads lower than gauge 8 by at least the temperature difference found in step 1.

7.Example: For a design supply temperature of 100 °F, the temperature difference would be 150 °F minus 100 °F, or 50 °F. Set the valves until gauge 9 reads at least 50 °F lower than gauge 8.

12"

max

Cold water

fill

GV Boiler

Legend

1 Boiler isolation valves

2Automatic air vent (with diaphragm-type

expansion tank), or connect to tank fitting (closed-type expansion tank).

3Diaphragm- or bladder-type expansion tank, if

used (For closed-type expansion tank, pipe from top of air separator to tank fitting as in Figure 10.)

 

5

System circulator

 

7

Hose bibb purge valve

 

8

Boiler pressure/temperature gauge

 

9

System supply temperature gauge

 

10

Return temperature gauge

 

14

Supply temperature limit control — Set at a

 

 

temperature below the maximum allowed for

 

 

the system or as directed by the system

 

 

designer.

 

15

Balancing valve

85015a

16

Balancing valve

 

 

Part number 550-141-850/0699

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Contents Gold GV How it works Gold GV Water boiler Series Please read before proceeding Hazard definitions Installer UserWhen servicing boiler Boiler operationBoiler water Contents Contents Overview of this section Ia Prepare boiler location overviewIb Prepare boiler location codes & altitude Installations must follow these codesClearance options Ic Prepare boiler location clearancesLarge space Small spacePrecautions Residential garage installationFlooring and foundation FlooringId Prepare boiler location vent system Removing from existing ventGV special vent system Air contamination Ie Prepare boiler location contaminationIf Prepare boiler location air openings GV in small space less than alone Special considerationsIIb Prepare boiler vent starter tee & drain IIa Prepare boiler overviewScrew hole Base rail Insert Cpvc elbow IIc Prepare boiler orifice plate Plate installationNatural gas PropaneBottom side of boiler front section IId Prepare boiler high altitude kit When requiredWhite Hose Red Altitudes above 5,500 feet onlyIIe Prepare boiler place in position Rotate Perform hydrostatic pressure test IIf Prepare boiler pressure testPrepare boiler for test Fig Fill and pressure testPiping connections for hydrostatic test For heating system with See pages 27 30 IIIa Water piping overviewIIIb Water piping relief valve Install relief valveSupply & return connections IIIc Water piping boiler connectionsAir separator Expansion tankPiping closed Zoning with circulators IIId Water piping all systemsBaseboard system piping IIIe Water piping baseboard systemRadiator system piping IIIf Water piping radiator systemIIIg Water piping single-zone radiant or heat pump system Outdoor reset control IIIh Water piping multi-zone radiant systemMulti-zone radiant heating system piping Manual bypass valves for fixed temp operation only IIIi Water piping snow melt systemWater chiller systems IIIj Water piping water chiller systemsIV Venting and combustion air Connecting gas supply piping to boiler Gas pipingPropane Gas Feet Electrical installation must comply with VI Field wiringWiring connections ThermostatsField wiring Factory wiring VIIa Start-up overview Freeze protection when usedVIIb Start-up preparation Verify water chemistryVerify gas/air orifice plate VIIb Start-up preparationCheck for gas leaks Fill the system with waterVIId Start-up to operate boiler VIIc Start-up read SectionPerform final checks before starting boiler Start the boilerVIIe Start-up if boiler doesn’t start VIId Start-up operate boilerConnect and adjust manometer VIIf Start-up altitude over 5,500 feet onlyCheck Gas Control Set Point At Least Inches Check-out procedure checklist VIIIa Check-out procedure overviewVIIIb Check-out procedure checklist IXa Operation overview Shows the ladder wiring diagram for the GV series 3 boilerSteps IXb Operation sequenceLadder diagram legend IXb Operation wiring diagramsGCM IXc Operation lighting instructions For Your Safety Read Before OperatingWhite-Rodgers gas valve model 36E Xa Service and maintenance overview Service technician Xb Service and maintenance scheduleAnnual start-up only by qualified service technician Xc Service & maintenance annual start-upStart-up Annual start-up check/test Xc Service & maint. annual start-upcontExpansion tank GaugesIgniter Annual start-up owner review Boiler relief valveReview with owner Condensate drain line Check valve assembly To remove the blower assembly Igniter XIa Troubleshooting overview XIb Troubleshooting procedures Before troubleshootingCheck the following Checking the air pressure switch XIc Troubleshooting air pressure switchBlower Housing XId Troubleshooting servicing tipsIgniter Gas ValveControl Module XIe Troubleshooting control modulePower Symptom Common Causes Possible Corrections XIf Troubleshooting common problemsSymptom Common Causes Possible Corrections Chart 1 Troubleshooting Power light status XIg Troubleshooting GCM lightsChart 2 Tstat Circ & Power lights flashing Chart 3 Limit & Power lights flashing Chart 4 Pres Switch & Power lights flashing Chart 5 Flame & Power lights flashing Chart 6 Tstat Circ light flashing and Power light on steady Chart 7 Limit light flashing and Power light on steady Is thermostat circuit closed continuity across wires? XIIa Replacement parts overview Water trim bag assembly #1 XIIb Replacement parts accessory bagDescription Model Weil-McLain Number Part number XIIc Replacement parts section assembly85041 422-200-228 XIId Replacement parts jacket assembly85042 382-200-340 XIIe Replacement parts Blower assemblyVent starter tee not included Description Weil-McLain Number Part number XIIf Replacement parts trim assembly85048 XIIg Replacement parts interior panel Interior panel Number Xiii Dimensions and ratingsDOE Gold GV Water boiler Series
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