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PG80MSU: Installation, Start-up, Operating and Service and Maintenance Instructions

Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.

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of gas valve outlet pressure, insufficient or poor quality combustion air,

incorrect size or damaged orifice(s), improper gas, or a restricted heat

exchanger. Action must be taken to correct the problem. 
If it becomes necessary to clean the heat exchangers because of dust or

corrosion, proceed as follows:

1. Turn OFF gas and electrical power to furnace.
2. Remove outer access door.
3. Disconnect vent connector from furnace vent elbow.
4. Disconnect wires to the following components. Mark wires to aid in

reconnection  of  (be  careful  when  disconnecting  wires  from

switches because damage may occur):

a. Inducer motor

b. Transducer

c. Limit over-temperature switch

d. Gas valve

e. Hot surface igniter

f. Flame-sensing electrode

g. Burner thermal switch

h. DSS Draft Safeguard

5. Remove screws that fasten the inducer cover assembly to the cell

panel. Be careful not to damage the collector box. Inducer assembly

and elbow need not be removed from collector box.

6. Disconnect gas supply line from gas valve.
7. Remove screws that attach the burner assembly to the cell panel.

The gas valve and burners tube need not be removed from burner

box. 

NOTE: 

Be  very  careful  when  removing  burner  assembly  to  avoid

breaking igniter.

8. Remove insulation assembly from burner tube inlets.

NOTE: 

Proper  use  of  Personal  Protective  Equipment  (PPE)  must  be

followed,  including  safety  glasses,  gloves,  and  dust  mask  when

removing and reinstalling the heat exchanger insulation assembly.

9. Using field-provided large caliber rifle cleaning brush, 36-in. (914

mm) long  steel  spring  cable,  a  variable  speed,  reversible  electric

drill, and vacuum cleaner, clean cells as follows:

NOTE: 

The materials needed in item NO TAG can usually be purchased

at local hardware stores. 

a. Remove metal screw fitting from wire brush to allow insertion 

into cable.

b. Insert the twisted wire end of brush into end of spring cable, and 

crimp tight with crimping tool or crimp by striking with 

ball-peen hammer. TIGHTNESS IS VERY IMPORTANT.

A180230

Fig. 38 – Igniter Position

(1.) Attach variable-speed, reversible drill to the end of

 

spring 

cable (end opposite brush).

 

(2.) Insert brush end of cable into the outlet opening of cell

 

and 

slowly rotate with drill. DO NOT force cable.

 

Gradually 

insert cable into upper pass of cell, see

 

Fig. 39

.

(3.) Work cable in and out of cell 3 or 4 times to obtain

 

sufficient 

cleaning. DO NOT pull cable with great

 

force. Reverse drill 

and gradually work cable out.

(4.) Insert brush end of cable in burner inlet opening of

 

cell, and 

proceed to clean two lower passes of cell in

 

same manner as 

upper pass.

(5.) Repeat foregoing procedures until each cell in furnace

 

has 

been cleaned.

(6.) Using vacuum cleaner, remove residue from each cell.

(7.) Using vacuum cleaner with soft brush attachment,

 

clean 

burner assembly.

(8.) Clean flame sensor with fine steel wool.

(9.) Reinstall the insulation assembly. 

NOTE: 

If  insulation  assembly  is  damaged,  do  not  attempt  to  repair,

must be replaced with insulation kit.

NOTE: 

Proper  use  of  Personal  Protective  Equipment  (PPE)  must  be

followed,  including  safety  glasses,  gloves,  and  dust  mask  when

removing and reinstalling the heat exchanger insulation assembly.

(10.)Reinstall burner assembly. 

10. Remove old sealant from cell panel and collector box flange.
11. Spray  releasing  agent  on  the  heat  exchanger  cell  panel  where

inducer cover assembly contacts cell panel.

 

NOTE: 

A releasing agent such as cooking spray or equivalent (must not

contain  corn  or  canola  oil,  aromatic  or  halogenated  hydrocarbons  or

inadequate  seal  may  occur)  and  RTV  sealant  (G.E.  162,  6702,  or

Dow-Corning 738) are needed before starting installation. 

NOTE: 

DO NOT substitute any other type of RTV sealant. 

12. Apply new sealant to flange of collector box and attach to cell panel

using existing screws, making sure all screws are secure.

13. Reconnect  wires  to  the  following  components.  (Use  connection

diagram on wiring label, if wires were not marked for reconnection

locations.): 

a. Burner thermal switch

b. Inducer motor

c. Transducer

d. Limit over-temperature switch 

e. Gas valve

f. Hot surface igniter

g. Flame-sensing electrode

h. DSS Draft Safeguard

14. Reinstall  vent  connector  on  furnace  vent  elbow.  Securely  fasten

vent  connector  to  vent  elbow  with  two  (2)  field-supplied,

corrosion-resistant, sheet metal screws located 180° apart.

15. Replace blower access door only, if it was removed.
16. Set  thermostat  above  room  temperature  and  check  furnace  for

proper operation.

17. Verify  blower  airflow  and  speed  changes  between  heating  and

cooling.

18. Check for gas leaks.
19. Replace outer access door.

Summary of Contents for PG80MSU

Page 1: ...NFORMATION GUIDE 40 MODEL NOMENCLATURE 40 To learn more about this appliance and installation via a mobile device go to https www payne com NFC or use the QR code below To access airflow tables or tro...

Page 2: ...se carbon monoxide poisoning explosion fire electrical shock or other conditions which may cause personal injury or property damage Consult a qualified service agency local gas supplier or your distri...

Page 3: ...ply ducts carry air circulated by the furnace to areas outside the space containing the furnace the return air shall also be handled by duct s sealed to the furnace casing and terminating outside the...

Page 4: ...db Failure to follow these return air temperature limits may affect reliability of heat exchangers motors and controls see Fig 4 For accessory installation details refer to the applicable instruction...

Page 5: ...city firmly touch a clean unpainted metal surface of the furnace again before touching control or wires 5 Use this procedure for installed and uninstalled ungrounded furnaces 6 Before removing a new c...

Page 6: ...ut rating for all gas appliances installed in the space Spaces having less than 50 cubic feet per 1 000 BTUh require the OUTDOOR COMBUSTION AIR METHOD Spaces having at least 50 cubic feet per 1 000 BT...

Page 7: ...ss volume than 50 cubic feet per 1 000 BTUh of the maximum input ratings for all gas appliances installed in the space and 2 The air infiltration rate is not known to be less than 0 40 air changes per...

Page 8: ...ings with unusually tight construction additional air MUST be provided using the methods described in the Outdoor Combustion Air Method section Unusually tight construction is defined as construction...

Page 9: ...own in Fig 13 NOTE It is required that the perforated supply air duct flanges be completely folded over or removed from furnace when installing the furnace on a factory supplied cased coil or coil box...

Page 10: ...Protection Provide a minimum 17 3 4 in x 22 in 451 mm x 559 mm piece of sheet metal for flame roll out protection in front of burner area for furnaces closer than 12 inches 305 mm above the combustibl...

Page 11: ...n a 1 in 25 mm clearance from combustible materials to supply air ductwork for a distance of 36 in 914 mm horizontally from the furnace See NFPA 90B or local code for further requirements Ductwork Aco...

Page 12: ...GC Installations must be made in accordance with all authorities having jurisdiction If possible the gas supply line should be a separate line running directly from meter to furnace NOTE In the state...

Page 13: ...and downstream of manual equipment shutoff valve A02035 Fig 22 Typical Gas Pipe Arrangement Piping should be pressure and leak tested in accordance with NFGC in the United States local and national pl...

Page 14: ...in Step 1 5 Route J Box wires within furnace away from sharp edges rotating parts and hot surfaces WARNING ELECTRICAL SHOCK AND FIRE HAZARD Failure to follow this warning could result in personal inju...

Page 15: ...ket BX Cable Installation in Furnace J Box 1 Remove cover from J Box 2 Route BX cable into 7 8 inch diameter hole in J Box 3 Secure BX cable to J Box bracket with connectors approved for the type of c...

Page 16: ...sted or draft hood equipped appliances in accordance with the NFGC the local building codes and furnace and vent manufacturers instructions The following information and warning must be considered in...

Page 17: ...in operation Seal any unused openings in venting system Inspect the venting system for proper size and horizontal pitch as required in the current edition of National Fuel Gas Code ANSI Z223 1 NFPA 5...

Page 18: ...condensation and corrosion in the venting system Do not use vent dampers on appliances common vented with this furnace Additional Venting Requirements A 4 101 mm round vent elbow is supplied with the...

Page 19: ...t connector is required refer to Note 1 above 3 Side outlet vent for upflow and downflow installations must use Type B vent immediately after exiting the furnace except when factory authorized Downflo...

Page 20: ...0 935 875 815 750 690 620 570 520 470 6 1050 995 935 880 820 755 700 645 595 550 7 1130 1075 1020 970 915 855 800 745 690 645 8 1200 1150 1100 1050 1000 945 890 840 785 735 9 1285 1240 1190 1145 1095...

Page 21: ...315 175 3 1035 935 830 745 640 550 460 365 235 140 4 1095 1000 900 815 725 630 545 455 360 240 5 1205 1125 1035 945 870 780 695 620 540 455 6 1290 1210 1125 1040 965 890 805 725 645 570 7 1385 1310 1...

Page 22: ...ct Super Plug available from distributor replacement component for the control board to copy the correct model program onto the new board Further details and instructions for these programming methods...

Page 23: ...Service and Maintenance Instructions Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 23 A221015 Fig 34 3 Digit Display Flow Char...

Page 24: ...to the gas valve if a flame rollout or overheating condition occurs in the gas control area DO NOT bypass the switches Correct inadequate combustion air supply problem before resetting the switches CA...

Page 25: ...e unit rating plate For installation above 2 000 ft 610 M multiply the input on the rating plate by the derate multiplier in Table 14 for the correct input rate A180238 Fig 37 Orifice Hole WARNING FIR...

Page 26: ...door switch f Set thermostat to call for heat g Remove regulator seal cap and turn regulator adjusting screw counterclockwise out to decrease input rate of clockwise in to increase input rate h Instal...

Page 27: ...2 6 2 7 2 8 2 9 850 2 4 2 5 2 6 2 7 to 875 2 3 2 4 2 5 2 5 900 2 2 2 3 2 3 2 4 5000 925 2 1 2 1 2 2 2 3 1524 950 2 0 2 0 2 1 2 2 975 1 9 1 9 2 0 2 0 1000 1 8 1 8 1 9 1 9 U S A Only 725 3 2 3 3 3 4 3...

Page 28: ...U S A Only 725 2 9 3 0 3 1 3 1 750 2 7 2 8 2 9 3 0 5001 775 2 5 2 6 2 7 2 8 1524 800 2 4 2 4 2 5 2 6 825 2 2 2 3 2 4 2 5 to 850 2 1 2 2 2 2 2 3 875 2 0 2 0 2 1 2 2 5400 900 1 9 1 9 2 0 2 1 1646 925 1...

Page 29: ...failure If limit control does not function during this test cause must be determined and corrected a Run furnace for at least 5 minutes b Gradually block off return air with a piece of cardboard or sh...

Page 30: ...es proceed with the following NOTE NO thermostat signal may be present at control and all blower OFF delays must be completed a Leave 115 V power to furnace turned on b Remove outer access door c Remo...

Page 31: ...d dirt and grease from blower wheel and motor annually The inducer and blower motors are pre lubricated and require no additional lubrication These motors can be identified by the absence of oil ports...

Page 32: ...eel wool 0000 grade Do not use sand paper or emery cloth To reinstall igniter and flame sensor 1 Install the Hot Surface Igniter HSI and bracket with igniter gasket into burner assembly 2 Install flam...

Page 33: ...end of spring cable end opposite brush 2 Insert brush end of cable into the outlet opening of cell and slowly rotate with drill DO NOT force cable Gradually insert cable into upper pass of cell see Fi...

Page 34: ...iod the control CPU will open the gas valve relay GVR de energizing the gas valve solenoid GV The control CPU will repeat the ignition sequence for up to three more Trials for Ignition before going to...

Page 35: ...er motor BLWM operation 4 Heat pump When installed with a heat pump the furnace control automatically changes the timing sequence to avoid long blower off times during demand defrost cycles Whenever W...

Page 36: ...lation Start up Operating and Service and Maintenance Instructions Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 36 TROUBLESHO...

Page 37: ...U Installation Start up Operating and Service and Maintenance Instructions Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 37 A2...

Page 38: ...Start up Operating and Service and Maintenance Instructions Manufacturer reserves the right to change at any time specifications and designs without notice and without obligations 38 A221105 Fig 40 T...

Page 39: ...re only furnace is running Firing rate heat content btu cu ft X size of the dial cu ft rev X of rev per 60 sec rev sec X 3600 sec hr Example 1050 btu cu ft X 0 5 cu f t rev X 2 revs 60sec X 3600 sec h...

Page 40: ...ll Cell panel Inducer Group Housing assembly Transducer Inducer motor Inducer wheel TO OBTAIN INFORMATION ON PARTS Consult your installing dealer or a licensed Heating and Air Conditioning company of...

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