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  4. Gas-Fired Furnace
  5. User's Information Manual

GAMA Gas-Fired Furnace User's Information Manual

Summary of Gas-Fired Furnace

  • Page 1

    Installation and servicing instructions and user's information manual **installer — affix this instruction packet adjacent to the furnace. **homeowner — retain these instructions for future reference. Instructions d'entretien et installation et manuel de l'usager **installateur -- placez la pochette...

  • Page 2

    Owner record furnace model # serial # installation date installed by: dealer address telephone # license # contact person other equipment installed: equipment type model # serial # installation date equipment type model # serial # installation date equipment type model # serial # installation date w...

  • Page 3: User'S Information Manual

    User's information manual gas-fired furnace read all instructions in this manual and retain this and all additional instructions for future reference. Congratulations... ...You have one of the most modern gas furnaces made. Your unit has been carefully selected to keep you warm and comfortable durin...

  • Page 4

    For your safety - read before operating here are a few "do's and don'ts" • do become familiar with the user's instruction manual and installation instructions. • do check to see that your home has adequate insulation, weatherstripping, caulking, and storm windows. Elimination of infiltration of outs...

  • Page 5

    11. Set the thermostat to the desired setting. 12. If the furnace will not operate, follow the instructions in "to turn off gas to furnace" and call your service technician or gas supplier. To turn off gas to furnace 1. Set the thermostat to the lowest setting. 2. Turn off all electric power to the ...

  • Page 6

    Maintenance of your furnace always shut off all power to the unit before attempting any of the following maintenance procedures. Failure to do so may result in personal injury. There are routine maintenance steps you should take to keep your furnace operating efficiently. This maintenance will assur...

  • Page 7

    In all direct vent (two pipe) instances, the vent outlet shall be installed so as to be in the same atmospheric pressure zone as the combustion air intake. 2. This furnace is not designed for use with a vent damper. Use of such a device will not improve the efficiency of this furnace and can cause a...

  • Page 8

    Figure 3 do not attempt to adjust flame! Your service representative will perform this adjustment correctly. Condensate collection and disposal system if the furnace has a condensate drain, it is incorporated within the furnace and is selfpriming. The condensate system must not be exposed to tempera...

  • Page 9

    Affix label here installation instructions upflow or left horizontal two stage heat variable speed gas-fired condensing warm air furnace issue 0442 table of contents safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 furnace specifications . . . . . . . . ...

  • Page 10: Safety

    Safety the following is a list of safety precautions and their locations in this manual. These safety rules and precautions must be followed when installing this furnace. 1. Use only with type of gas approved for this furnace. Refer to the furnace rating plate. 2. Install this furnace only in a loca...

  • Page 11

    Furnace specifications model unit dimensions duct supply opening duct return opening air inlet & vent connection dia.* max. Over current protection max. Unit amps electrical supply min. Wire size(awg) temperature rise range net weight lbs length width height a b c d e f g h ev050u3 29 1/2 13 1/2 47 ...

  • Page 12

    Blower motor specifications and airflow adjusting data adjusting airflow model motor hp blower wheel heat setting cool settings adjust heat cool cfm @ .50 static heating cfm adjustment setting "a" setting "b" setting "c" setting "d" ev050u3 1/2 10 x 6 norm a norm 1200 1000 800 600 low fire 600 ( + )...

  • Page 13

    Furnace wiring specifications 20558801 issue 0442 page 5 of 32.

  • Page 14

    The furnace cabinet must have an uninterrupted or unbroken electrical ground to minimize personal injury if an electrical fault should occur. The unit must also be electrically grounded in accordance with local codes, or in the absence of local codes, with the latest edition of the (u.S.) national e...

  • Page 15

    Failure to comply with all of the clearances will create a fire hazard. Installation positions the furnace should not be connected to an operational chimney. The furnace should also be located as near to the center of the air distribution system as possible, and should be installed level. This furna...

  • Page 16

    Air for combustion and ventilation contaminated combustion air: if the furnace is to be installed in a structure defined as having contaminated combustion air, the furnace must use the direct vent (two pipe) configuration using non- contaminated outside air for combustion. Allowing exposure to subst...

  • Page 17

    If ventilation and/or combustion air must be supplied to the "confined space" from inside the building structure, two permanent openings to an additional room of sufficient volume as to combine the volumes of the spaces to meet the criteria for an "unconfined space" must be created. Each opening mus...

  • Page 18

    Figure 4 confined space / outdoor air from attic figure 5 confined space / outdoor air from attic & crawl space for an attic installation it is important to keep insulation 12" or more away from any furnace openings. Some types of insulating materials may be combustible. When horizontal ducts are us...

  • Page 19

    Ducting the proper sizing of warm air ducts is necessary to insure satisfactory heating operation. Ductwork should be in accordance with the latest editions of (u.S.) nfpa-90a (air conditioning systems) and nfpa-90b (warm air heating and air conditioning systems) or canadian equivalent. Ductwork rec...

  • Page 20

    When installing the furnace with cooling equipment for year round operation, the following recommendations must be followed for series or parallel air flow: 1. In series flow applications, the coil is mounted after the furnace in an enclosure in the supply air stream. The furnace blower is used for ...

  • Page 21

    Figure 8 20558801 issue 0442 page 13 of 32 vent termination clearances.

  • Page 22

    Horizontal (side wall) vent termination: to prevent blockage of the combustion air and exhaust vent by snow, vent termination must be made 12" (in.) above the anticipated maximum snow accumulation level (see figure 10). A minimum of 4' (ft.) clearance must be provided from electric meters, gas meter...

  • Page 23

    The vertical vent system can be installed through an existing chimney provided that: a. No other appliance is vented into the chimney. B. The vent system does not terminate within the chimney and the termination clearances shown in figure 14 are maintained. C. Both the air intake and exhaust vent ru...

  • Page 24

    Table 4 allowable max vent lengths for 3" diameter venting application * allowable max vent lengths of 3" dia. Pvc, abs or cpvc sch 40 pipe elbows allowed 1 2 3 4 5 models 50 / 75 with direct exhaust (1 pipe) system 80 76 73 70 65 models 50 / 75 with direct vent (2 pipe) system 80 76 73 70 65 models...

  • Page 25

    Installation of air inlet connector: the air inlet connector must be installed on the top panel of the furnace (see figure 19). The connector and mounting screws are shipped in the vestibule of the furnace. The air inlet connector is placed over the hole pattern in the top panel and the lip on the b...

  • Page 26

    Figure 21 upflow trap figure 22 horizontal trap figure 23 horizontal left condensate tubing condensate disposal drain: this furnace must use the condensate trap supplied with the unit (see figures 17 and 18) for proper drain installation. The drain must terminate at a floor drain, sewer system, or d...

  • Page 27

    Electrical connections when installed, the furnace must be electrically grounded in accordance with local codes or, in the absence of local codes, with the (u.S.) national electrical codes, ansi/nfpa 70 or csa standard c22.1; part 1 canadian electrical code. For proper installation refer to furnace ...

  • Page 28

    Fire or explosion hazard failure to follow the safety warnings exactly could result in serious injury, death or property damage. Never test for gas leaks with an open flame. Use a commercially available soap solution made specifically for the detection of leaks to check all connections. A fire or ex...

  • Page 29

    Control board & variable speed motor features humidifier connections: terminals are provided on the blower control board for connections to a 120-volt optional humidifier. The "hum" terminal is energized whenever the thermostat calls for heat. Refer to furnace wiring diagram for specific connection ...

  • Page 30

    Unit sequence of operation here's how your heating system works: standby mode when the control is in standby mode, it continually monitors thermostat input, rollout switch, and flame sense. Call for heat on a call for 1 st stage heat (w1) from the room thermostat, the ignition control performs a 1-s...

  • Page 31

    Startup and operational checkout do not use this furnace as a construction heater. Use of this furnace as a construction heater exposes the furnace to abnormal conditions, contaminated combustion air and the lack of air filters. Failure to follow this warning can lead to premature furnace failure an...

  • Page 32

    Example: 3.50"w.C. Gas valve outlet pressure tap reading -.15"w.C. Burner box inlet pressure (hose not connected) 3.65"w.C. Actual manifold pressure instead of the desired 3.5"w.C. Figure 29 checking direct vent manifold pressure with burner box reference manifold pressure adjustment: the burner box...

  • Page 33

    4. Calculate the furnace input using the following formula: btuh = cubic ft/hr x btu/cubic foot the local gas supplier should be able to provide the heating value of the gas, in btu/cubic foot. If a specific value is not available, use 1000 btu/cubic foot for natural gas or 2500 btu/cubic foot for p...

  • Page 34

    Hand drilling of orifices is never acceptable since it could lead to delayed ignition, overfiring, improper combustion, flashback and flame rollout. All these conditions could lead to a fire hazard and bodily harm, or loss of life. Blower adjustment checkout: this furnace is equipped with a variable...

  • Page 35

    The homeowner how to operate the furnace system before leaving the job site. If the pressure switch activates to shut the furnace down, the vent and drain systems must be checked and cleared. Failure to do so may result in serious bodily harm or nuisance furnace shutdown and/or a hazardous condition...

  • Page 36

    Sequence of operation direct ignition system control 20558801 issue 0442 page 28 of 32.

  • Page 37

    Servicing the furnace electrical shock, fire or explosion hazard failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage. Improper servicing could result in dangerous operation, serious injury, death or property damage. • before servici...

  • Page 38

    4. Remove the burner access panel by removing the seven (7) no. 10 sheet metal screws that secure the panel to the cabinet. Be careful not to damage the rubber seal strips that are attached to the cabinet (behind the access panel). 5. Remove the no. 10 sheet metal screws that secure the manifold sea...

  • Page 39

    Control system diagnostics troubleshooting make the following visual checks before toubleshooting: 1. Check to see that the power to the furnace and the integrated ignition/blower control board is on. 2. The manual shutoff valves in the gas line to the furnace must be open 3. Make sure all wiring co...

  • Page 40

    Wiring diagram 20558801 issue 0442 page 32 of 32.