Crestron electronic 2.5, 3.5, 1.5 service manual Check inlet gas supply, GAS Piping Size Chart

Page 33

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Installation & Operation Manual

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6 Gas connections (continued)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 6B Natural Gas Pipe Size Chart

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

TABLE - 6B

 

 

 

 

 

 

 

 

 

 

 

 

 

GAS PIPING SIZE CHART

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Nominal

 

 

 

 

Length of Pipe in Straight Feet

 

 

 

 

 

 

Maximum

Iron Pipe

 

 

 

 

 

 

 

 

 

 

Capacity of Pipe

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Size

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

in Thousands

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

of Btu/hr for

Inches

10

20

30

40

50

60

70

80

90

 

100

125

150

175

200

 

gas pressures of

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14 Inches Water

1½

2,150

1,500

N/A

N/A

N/A

N/A

N/A

N/A

N/A

 

N/A

N/A

N/A

N/A

N/A

 

Column (0.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PSIG) or less and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

4,100

2,820

2,260

1,950

1,720

1,560

N/A

N/A

N/A

 

N/A

N/A

N/A

N/A

N/A

a pressure drop

 

of 0.5 Inch Water

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2½

6,460

4,460

3,610

3,100

2,720

2,460

2,310

2,100

2,000

 

1,900

1,700

1,540

N/A

N/A

Column (Based

 

on NAT GAS,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1025 Btu/hr per

3

11,200

7,900

6,400

5,400

4,870

4,410

4,000

3,800

3,540

 

3,300

3,000

2,720

2,500

2,340

 

Cubic Foot of

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Gas and 0.60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

23,500

16,100

13,100

11,100

10,000

9,000

8,300

7,690

7,380

 

6,870

6,150

5,640

5,130

4,720

Specific Gravity)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Check inlet gas supply

￿WARNING DO NOT adjust or attempt to measure gas valve outlet pressure. Attempting to alter

or measure the gas valve outlet pressure could result in damage to the valve, causing potential severe personal injury, death, or substantial property damage.

The gas piping must be sized for the proper flow and length of pipe, to avoid excessive pressure drop. Both the gas meter and the gas regulator must be properly sized for the total gas load.

If you experience a pressure drop greater than 1 inch w.c. (249 Pa), the meter, regulator, or gas line is undersized or in need of service. Perform the steps below when checking inlet gas supply:

1.Turn the main power switch to the “OFF” position.

2.Shut off gas supply at the manual gas valve in the gas piping to the appliance.

3.Remove the 1/8" pipe plug on the flange to the factory supplied gas shutoff valve and install a suitable 1/8" fitting (field supplied) for the manometer tubing. Place the tubing of the manometer over the tap once the 1/8" fitting is installed as shown in FIG. 6-4.

4.Slowly turn on the gas supply at the factory installed manual gas valve.

5.Turn the power switch to the “ON” position.

6.Adjust the temperature set point on the control panel of the SMART TOUCH control module to call for heat or utilize Service Mode, see page 44 of this manual.

7.Observe the gas supply pressure as the burner fires at 100% of rated input. Percent of burner input will be displayed on the Modulation Screen.

8.Ensure inlet pressure is within specified range. Minimum and maximum gas supply pressures are specified in this section of the manual.

9.If gas supply pressure is within normal range and no adjustments are needed, proceed on to Step 11.

10.If the gas pressure is out of range, contact the gas utility, gas supplier, qualified installer or service agency to determine the necessary steps to provide proper gas pressure to the control.

11.Turn the power switch to the “OFF” position.

12.Shut off the gas supply at the manual gas valve in the gas piping to the appliance.

13.Remove the manometer from the pressure tap on top of the gas valve. Remove the 1/8" (3 mm) field supplied fitting and reinstall the pipe plug removed in Step 3.

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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 RatingsDetermine boiler location Installation must comply withBefore locating the boiler, check Provide clearancesFlooring and foundation Provide air openings to roomVent and air piping Prevent combustion air contaminationWhen 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 Vent/air termination vertical Vertical direct ventingDetermine location Prepare roof penetrations4Alternate 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 Outdoor temperature sensor EnableLouver proving switch Low voltage connectionsAlarm contacts Auxiliary switch 1Wiring of the cascade System supply sensorField WiringCondensate drain Condensate disposalStart-up Freeze protection when usedCheck/control water chemistry Fill and test water systemCheck thermostat circuits Check for gas leaksInspect condensate system Inspect/check condensate lines and fittingsStart the boiler Final checks before starting the boilerIf boiler does not start correctly Check system and boilerFor 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 Service technician Maintenance Maintenance and annual startupOwner maintenance See the Crest User’s Information Manual for InstructionsMaintenance Check water system Flue vent system and air pipingCheck expansion tank Check boiler relief valveCheck all boiler wiring Check ignition ground wiringCheck control settings Check flame signalReview with owner Cleaning boiler heat exchangerHandling ceramic fiber materials Niosh stated First AidIntegrated Control Diagrams2Wiring Diagram
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