Lennox International Inc Gas Units, G61MP Series Units Gas Pressure Adjustment

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12−

If the appliance will not operate, follow the instructions

 

urning Off Gas to Unit" and call your service techni-

 

cian or gas supplier.

 

Turning Off Gas to Unit

 

1 −

Set the thermostat to the lowest setting.

2 −

Turn off all electrical power to the unit if service is to be

 

performed.

 

3 −

Remove the upper access panel.

4 −

White Rodgers 36E Gas Valve − Move gas valve

 

switch to OFF.

 

 

Honeywell VR8205 Gas Valve − Move switch on gas

 

valve clockwise

to OFF. Do not force.

5 −

Replace the upper access panel.

Gas Pressure Adjustment

Gas Flow (Approximate)

1 − Operate unit at least 15 minutes before checking gas flow. Determine the time in seconds for one revolu- tions of gas through the meter. A portable LP gas me- ter (17Y44) is available for LP applications.

2 − Compare the number of seconds and the gas meter size in table 12 to determine the gas flow rate. Multiply the gas flow rate by the heating value to determine the unit input rate. If manifold pressure is correct and the unit input rate is incorrect, check gas orifices for proper size and restriction.

3 − Remove temporary gas meter if installed.

NOTE − To obtain accurate reading, shut off all other gas appliances connected to meter.

Supply Pressure Measurement

A threaded plug on the inlet side of the gas valve provides access to the supply pressure tap. Remove the threaded plug, install a field−provided barbed fitting and connect a manometer to measure supply pressure. Replace the threaded plug after measurements have been taken.

Manifold Pressure Measurement

To correctly measure manifold pressure, the differential pressure between the positive gas manifold and the nega- tive burner box must be considered. Use pressure test adapter kit (available as Lennox part 10L34) to assist in measurement.

1 − Remove the threaded plug from the outlet side of the gas valve and install a field−provided barbed fitting. Connect test gauge

measure manifold pressure.

2 − Tee into the gas valve regulator vent hose and connect test gauge

TABLE 12

Gas Flow Rate (Ft.3/Hr.)

Seconds for 1

Gas Meter Size

Revolution

1/2 cu ft Dial

1 cu ft Dial

 

 

 

10

180

360

 

 

 

12

150

300

 

 

 

14

129

257

 

 

 

16

113

225

 

 

 

18

100

200

 

 

 

20

90

180

 

 

 

22

82

164

 

 

 

24

75

150

 

 

 

26

69

138

 

 

 

28

64

129

 

 

 

30

60

120

 

 

 

32

56

113

 

 

 

34

53

106

 

 

 

36

50

100

 

 

 

38

47

95

 

 

 

40

45

90

 

 

 

42

43

86

 

 

 

44

41

82

 

 

 

46

39

78

 

 

 

48

38

75

 

 

 

50

36

72

 

 

 

52

35

69

 

 

 

54

33

67

 

 

 

56

32

64

 

 

 

58

31

62

 

 

 

60

30

60

3 − Start unit on low heat (68% rate) and allow 5 minutes for unit to reach steady state.

4 − While waiting for the unit to stabilize, notice the flame. Flame should be stable and should not lift from burner. Natural gas should burn blue.

5 − After allowing unit to stabilize for 5 minutes, record manifold pressure and compare to value given in table 13.

6 − Repeat steps 3, 4 and 5 on high heat.

NOTE − Shut unit off and remove manometer as soon as an accurate reading has been obtained. Take care to remove barbed fitting and replace threaded plug.

CAUTION

Do not attempt to make adjustments to the gas valve.

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Contents Installation Instructions Table of ContentsFront View Side View G61MP Unit Dimensions − inches mmTOP View Glass Assembly G61MP Parts ArrangementTOP CAP Sight BlowerSafety Information Direct Vent Installation NON−DIRECT VentInstallation G61MP Gas FurnaceUse of Furnace as Construction Heater General Combustion, Dilution & Ventilation AirEquipment in Confined Space − ALL AIR from Inside Equipment in Confined Space − ALL AIR from Outside Installation − Setting EquipmentEquipment operation Setting Equipment Front ViewSide View END ViewUpflow Applications Refer to Engineering Handbook for additional informationFront View Furnace FrontSetting an Upflow Unit Leveling BoltFurnace Locations Bottom Leveling Bolt NON−COMBUSTIBLE Floor Opening SizeAdditive Base Floor Opening Size Side ViewINTAKE/EXHAUST Connection Support Frame Drain PAN Blower Access PanelTypical Horizontal Ceiling Application Intake Pipe Exhaust Pipe GAS ConnectorMIN Raised Platform Condensate Line Service Platform Pipe & Fittings Specifications Piping and Fittings SpecificationsFilters Duct SystemOutdoor Termination Kits and Corresponding Equivalencies Model DIAVent Piping Guidelines Minimum Vent Pipe Lengths Maximum Vent Pipe LengthsJoint Cementing Procedure Plastic strapping or a large wire tie Venting PracticesMAX Plug TrapTypical Exhaust Pipe Connections Transition Direct Vent applications where combustion air is takenFrom indoors and flue gases are discharged outdoors Sweep ELL Intake Debris Screen Page Inside Corner Detail Inches 305mm or 12 in mmUS Installations1 Canadian Installations2 Exhaust Pipe Termination Size Reduction G61MPDirect Vent Roof Termination KIT TOP View Wall Ring KIT with Straight IntakeFront View Using Existing Chimney ANGLE−CUT in Direction G61MP Direct Vent ApplicationSide View NON−DIRECT Vent Wall Ring Termination G61MP NON−DIRECT Vent Application Using Existing ChimneyCondensate Piping Condensate Assembly Coupling CLEAN−OUT Access−RINGS CAP HI/LO Screws Vent Nipple TEEGas Piping Furnace Isolate GAS ValveHorizontal Applications Possible Gas Piping Configerations GAS Pipe Capacity − FT3/HR kL/HRPrecautions and Procedures Interior MAKE−UP BOX InstallationElectrical Electrostatic Discharge ESDTypical G61MP Field Wiring Diagram Heat / 2 Cool Cut Intact OFF Cut IntactTWO−STAGE Integrated Control Board = Error Code Recall H= 24V Humidifier Output L= do not USEDIP Switches Function Integrated Control Board DIP Switch Settings and Jumpers Typical G61MP Wiring Diagram Unit Start−Up For Your Safety Read Before OperatingIntegrated Control Board White Rodgers 36E Series GAS Valve Honeywell VR8205 Series GAS ValveIf the appliance will not operate, follow the instructions Gas Pressure AdjustmentUrning Off Gas to Unit and call your service techni High Altitude Information Order TWO EachOther Unit Adjustments Carbon Monoxide Poisoning HazardPage Blower Performance Data 270In. w.g High Low Cfm Watts 2840 1450 In. w.g High Low Cfm Watts 2720 1385 In. w.g High Low Cfm Watts 2730 1465 Heating Sequence of Operation Service Electrical SHOCK, Fire Or Explosion HazardPage Planned Service + Y Ignition Control Board Diagnostic CodesFlash Code Status / Error Description Troubleshooting Heating Sequence of Operation On NextHeating Sequence of Operation Thermostat Calls for Heat Status LED − HeartbeatU1.40 microamps Or Heat Demand is SATISFIED. a Five Troubleshooting Cooling Sequence of Operation Cooling Sequence of OperationContinuous LOW Speed FAN Sequence of Operation Troubleshooting Continuous Fan Sequence of OperationRepair Parts List Heat Anticipator Setting? Thermostat Level? Vent Pipe Sizing WorksheetG61MP Start−Up & Performance Check List − LP/Propane High Fire Manifold PressureRequirements for Commonwealth of Massachusetts LY BELOW. Keep Clear of ALL OBSTRUC- Tions
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G61MP Series Units, Gas Units specifications

Lennox International Inc. has established itself as a leader in the heating and cooling industry, and its G61MP Series Gas Units stand as a testament to the company's commitment to innovation and energy efficiency. These gas units are specifically designed for residential applications and are recognized for their reliability, performance, and advanced technology.

One of the main features of the G61MP Series is its variable speed motor, which offers significantly enhanced comfort over traditional single-stage gas units. This technology allows for precise temperature control and improved humidity management. By adjusting its speed according to the heating demand, the unit minimizes temperature fluctuations, leading to a more consistent indoor climate.

Another notable characteristic of the G61MP Series is its ECM blower motor, which operates quietly and efficiently. This motor not only reduces energy consumption but also enhances the overall comfort of the home by providing a steady flow of warm air without the disruptive noise often associated with traditional gas units.

The G61MP Series units are designed with a focus on energy efficiency, boasting an impressive Annual Fuel Utilization Efficiency (AFUE) rating. This rating indicates that these units convert a significant portion of the fuel they consume into usable heat, resulting in lower energy bills for homeowners. The units are equipped with a modulating gas valve that further optimizes fuel usage by adjusting the gas flow according to the heating needs of the home.

Safety is a paramount consideration in the design of the G61MP Series. These units are built with advanced safety features, including a self-diagnostic control system that continuously monitors the unit’s performance. This system alerts homeowners to any potential issues, allowing for proactive maintenance and ensuring the longevity of the equipment.

The G61MP Series is also designed for ease of installation and servicing. Its compact design allows for flexible placement in various home environments, while the user-friendly access panels simplify routine maintenance tasks.

In conclusion, Lennox International Inc.'s G61MP Series Gas Units deliver a combination of advanced technology, energy efficiency, and reliability, making them an excellent choice for homeowners looking to enhance their heating systems. With features designed to maximize comfort, minimize energy costs, and ensure safety, these units represent a significant advancement in residential heating solutions.