Miller CMF2 80 PG Instruction Manual

CMF2 80-PG CONVERTIBLE (65, 75, & 85 KBTU/H INPUTS)CMF2 80-PO CONVERTIBLE (65, 75, & 85 KBTU/H INPUTS)Counterfl ow Gas or Oil Heating Appliance

10materials, fi xtures, are to be suitable for the expected ambient temperatures to which they will be subjected.• The negative pressure in the closet

11Figure 4. MA-200 Base PanFRONTCombustion AirKnock-outs(7-1/4” X 2-1/4”)Feeder Duct OpeningFlueLocation24 1/88 3/812 1/812 1/89 1/818 1/4MA-200 Base

12the top of the base pan and seal that fl ange with metal tape. NOTE: If using a “V” or “U”-box crossover system, use manufacturers instructions for i

13Combustion Air Duct/Pipe InstallationThe CMF2 furnace must draw the combustion air from outside (except for special installations) and requires usin

14Figure 11. Vent Pipe InstallationVENT PIPEFLUE PIPEOF FURNACETURN TO LOCK-TIGHTEN SCREWRA-S4RA-S3RA-S2.54/123/122-1/2/12NoneFlatNOTES:SRJ1 & SRJ

15FUEL CONNECTIONS• All gas piping must be installed in compliance with local codes and utility regulations. In the absence of local codes the gas li

16joint or union using a small paintbrush. If any bubbling is observed, the connection is not sealed adequately and must be retightened. Repeat the ti

17Oil piping - PO Series OnlyThe following procedures are recommended as good practice. However, requirements of local codes and ordinances, H.U.D. Ma

18• Electrical connections must be in compliance with all applicable local codes and ordinances, and with the current revision of the National Electri

19Thermostat Connections• Thermostat connections shall be in accordance with the instructions supplied with the thermostat and the indoor equipment.

2TABLE OF CONTENTSImportant Safety Information ...3Requirements & Codes ...

20Pre-Start Check List Verify the polarity of the connections are correct, the line voltage power leads are securely connected and the furnace is pro

21Checking the Input of the FurnaceRefer to the furnace rating plate to determine the fi ring rate of the furnace. Using Table 4 (page 19), determine t

22 WARNING:Do not attempt to drill the gas orifi ces. Use only factory supplied orifi ces. Improperly drilled orifi ces may cause fi re, explosion, carbo

23burner motor (orange) control terminal by splicing or adding tab adapters. Seal and isolate any bare wires. See Figure 16.Firing Rate ConversionThe

24• If control locks out 3 times, the control enters restricted lockout. To reset: Honeywell R7184: hold down the reset button for 45 seconds until t

2524 volts supplied to gas valve during ignition but no main gas fl ow.• Gas valve may be defective. Replace if necessary.• Gas piping may be plugged

267. If the burner stays running, the system is operational.8. If the (LED indicator for R7184 control; green LED for 7505 control) is off, check th

27UNIT MAINTENANCE WARNING:Shut off all electrical power to the unit before performing any maintenance or service on the system. Failure to comply may

28FIGURES & TABLESFigure 17. CMF2 Physical Dimensions57241418218235821413581692125"114115811584"318614

29WIRING DIAGRAMFigure 18. Wiring Diagram for CMF2 Gas & Oil FurnacesFANSWITCHFAN ON/OFFSWITCH321DOOR SWITCHBURNER RECEPTACLENL1AIRLIMITDECK LIMIT

3IMPORTANT SAFETY INFORMATIONINSTALLER: Please read all instructions before servicing this equipment. Pay attention to all safety warnings and any oth

30Figure 19. Furnace ComponentsLOCATION OF FURNACE COMPONENTSBlowerAssemblyBlowerMotorCapacitorGas ValveCirculating AirBlowerOilPumpDoorSwitchControlP

31

INSTALLATION / PERFORMANCE CHECK LISTINSTALLER NAME:CITY: STATE:INSTALLATION ADDRESS:CITY: STATE:UNIT MODEL #UNIT SERIAL #Minimum clearances per Table

4• The Commonwealth of Massachusetts requires compliance with regulation 248 CMR 4.00 and 5.00 for installation of through – the – wall vented gas app

5The information listed below is for reference purposes only and does not necessarily have jurisdiction over local or state codes. Always consult with

6General Information WARNING:This furnace must be installed by a qualifi ed installing agency and in accordance with applicable local codes and ordinan

7is a manually reset switch. DO NOT install jumper wires across these switches to defeat their function or reset a switch without identifying and corr

8damper. All fl ue pipe joints should be fastened with sheet metal screws for rigidity.The chimney height, required draft, and number of appliances ser

9CIRCULATING AIR REQUIREMENTS WARNING:All supply ducts must be secured to the furnace with sheet metal screws and adequately sealed. When supply air i