Nordyne CMF80-PO User Manual

Owners Manual/Installation Instructions
CMF80-PG Convertible (65, 75, and 90 KBTU/H Inputs),
CMF 100-PG (90 KBTU/H Input)
CMF80-PO Convertible (65, 75, and 90 KBTU/H Inputs),
CMF 100-PO (90 KBTU/H Input)
Counterflow Gas or Oil Heating Appliance
Read all instructions carefully before beginning the installation. Read all labels and tags
on the furnace carefully and follow all precautions outlined on those labels and tags.
FOR YOUR SAFETY
Do not store or use gasoline or other
flammable vapors and liquids in the
vicinity of this or any other appliance.
!
WARNING:
Improper installation, alteration, ser-
vice or maintenance can cause injury
or property damage. Refer to this
manual for assistance or consult a
qualified installer, service agency, or
the gas supplier for additional infor-
mation.
FOR YOUR SAFETY
WHAT TO DO IF YOU
SMELL GAS
• Do not try to light any appliance.
• Do not touch any electric switch; do not
use any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
• If you cannot reach your gas supplier, call
the fire department.
Rated CMF-PG CMF-PO CMF-PG CMF-PO
BTUH 80 CONV. 80 CONV. 100 100
Input 75,000 75,000 90,000 90,000
Output 56,000 60,000 68,000 72,000
GENERAL
CMF furnaces are high quality, direct vent
furnaces used for manufactured housing, rec-
reational vehicle, and residential
†
applications.
These furnaces are offered in either power gas
(designated by PG) or power oil (designated by
PO) models. The power gas models are de-
signed for operation with either natural or pro-
pane (LP) gas.
The CMF series is convertible from power oil to
power gas, and vice versa. Furthermore, the
firing rate of the CMF80 Convertible Series can
be changed using a certified NORDYNE
conversion kit field-installed by a qualified service
technician. Refer to the “Firing Rate Conversion”
section later in these instructions for more
information on the firing rate change.
These furnaces are certified to the UL307
standards (UL 307A for oil models; UL 307B for
gas models), and can be installed in a variety of
applications, as shown in Table 1. This furnace
is not to be used for temporary heating of
buildings or structures under construction.
!
WARNING:
This furnace must be installed by a quali-
fied installing agency and in accordance
with applicable local codes and ordi-
nances that govern this type of equip-
ment. Failure to properly install the fur-
nace, base assembly, and venting sys-
tem as described herein may damage the
equipment and/or the home, can create a
fire or asphyxiation hazard, violates U.S.
listing requirements, and will void the
warranty. This furnace is NOT approved
for installation with split system air con-
ditioning. Use a NORDYNE packaged air
conditioning system.

Nordyne CMF80-PO Specifications

General

Fuel Type	Oil
Voltage	115V
Blower Motor	Multi-speed
Thermostat Compatibility	Standard
Heating Capacity	80, 000 BTU
BTU	80, 000 BTU
Stages	Single Stage
Efficiency	80%

Summary

INSTALLATION REQUIREMENTS

Equipment Check

Instructions for inspecting the furnace unit upon arrival for any damages or shortages.

Requirements and Codes

Guidance on complying with all applicable codes, standards, and local regulations for installation.

Combustion Air and Ventilation Requirements

Details on providing adequate combustion air and ventilation as per relevant codes and standards.

Venting Requirements - Manufactured Housing

Venting Requirements - Residential Installations

Unit Location and Clearance Requirements

UNIT INSTALLATION

MA-200 Base Installation

Detailed steps for installing the furnace using the MA-200 base pan for manufactured homes.

FUEL CONNECTIONS

Gas Piping Requirements - PG Series

Guidelines for sizing and installing gas supply piping for PG series furnaces.

Oil Piping Installation - PO Series

Recommendations for oil piping installation following local codes and standards.

Fuel Line Hook-Up Procedures

One Line System

Recommended hook-up for oil supply lines when vertical lift is not more than eight feet.

Two Line System

Procedure for a two-line oil supply system when vertical lift exceeds eight feet.

ELECTRICAL WIRING

Line Voltage Requirements

Ensuring correct voltage, frequency, and phase of the supply source match unit specifications.

Line Voltage Connections

Step-by-step instructions for connecting the power supply wiring to the furnace control box.

Room Thermostat Requirements

Fan and Limit Settings

CMF PG Direct Ignition Gas Burner Operations

Safety Before Lighting or Operating

Crucial safety information to read before operating the gas furnace.

Actions for Gas Leak Detection

Immediate safety steps to take if a gas leak is detected.

PG Direct Ignition Burner Operating Instructions

Step-by-step guide for starting and operating the direct ignition gas burner.

Checking the Input of the Furnace

Gas Pressure Measurement and Adjustment

Natural Gas to LP Conversion

Adjusting the Burner

CMF PO Oil Burner Operations

Oil Burner Start-Up Procedure

Steps to follow for the initial start-up of the oil burner.

Air-Bleed Procedure - Single Pipe

Process for bleeding air from the oil pump in a single-pipe installation.

Oil Burner Shutdown Procedure

Steps to properly shut down the oil burner.

Flame Adjustment

Procedure for adjusting the air shutter for optimal CO2 and smoke levels.

Electrode Setting

Instructions for checking and adjusting electrode positioning for proper ignition.

Firing Rate Conversion

Information on converting the furnace's firing rate using certified kits.

Furnace Operating Sequence

Gas Furnace Operation Sequence

Detailed sequence of operations for the gas furnace during a heating call.

Oil Furnace Operation Sequence

Sequence of operations for the oil furnace using the Honeywell R7184 primary control.

Adjusting Heat Distribution

Furnace Service Guide - Direct Ignition

Burner Motor Start Issues

Troubleshooting steps when the burner motor fails to start despite a thermostat call for heat.

No Flame or Motor Issues

Troubleshooting steps when the burner motor runs but no flame is produced.

Ignitor Heating Problems

Diagnosing issues when the ignition control has power but the ignitor does not heat.

Furnace Service Guide - Common Issues

Main flame ignites but burner locks out.

Troubleshooting steps when the main flame ignites but the burner subsequently locks out.

24 volts supplied to gas valve during ignition but no main gas flow.

Diagnosing issues when 24V is supplied but no gas flows to the main burner.

Insufficient Heat Output

Troubleshooting steps when the burner operates but does not provide sufficient heat.

Burner Fails to Shut Off

Troubleshooting steps when the burner fails to shut off after the thermostat is satisfied.

Addressing Noisy Fire

Steps to address noisy fire conditions, often related to air adjustment.

Reducing High Gas Bills

Tips for reducing high gas bills, focusing on efficiency and insulation.

Blower Operation Issues

Troubleshooting steps when the circulation blower does not operate while the burner is running.

Control Module Status Indicators

Gas Furnace Status Indicators

Indicator light status and meanings for gas furnace control module lockouts.

Oil Furnace Status Indicators

Indicator light status and meanings for oil furnace primary control (lockout, recycle, cad cell).

Honeywell R7184 Primary Control Troubleshooting

Burner Start-Up Failure

Steps to diagnose why the burner does not start when a call for heat is initiated.

Burner Lockout with Flashing Indicator

Troubleshooting burner lockout with flashing indicator light, often related to primary control issues.

R7184 Control - Additional Troubleshooting

Unstarted Burner with Specific Flash Code

Diagnosing burner start issues indicated by specific flashing light patterns on the primary control.

Cad Cell Resistance Check

Procedure for checking cad cell resistance to ensure proper burner operation.