Johnson-controls CM8M/CMLM*MP User Manual

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368261-UIM-A-0508
EFFICIENCY
RATING
CERTIFIED
ISO 9001
Certified Quality
Management System
RESIDENTIAL GAS FURNACE
WITH PSC MOTOR
MODELS:
TM8M/TMLM*MP, YM8M/YMLM*MP,
CM8M/CMLM*MP, LM8M/LMLM*MP
(80% Modulating Multi-position / Low NOx)
INSTALLATION MANUAL
LIST OF SECTIONS
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ELECTRICAL POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
TWINNING AND STAGING . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
VENT SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
START-UP AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . 20
SAFETY CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
NORMAL OPERATION AND DIAGNOSTICS . . . . . . . . . . . . . 25
REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . 27
REPLACEMENT PART CONTACT INFORMATION . . . . . . . . 27
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
LIST OF FIGURES
Duct Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Vertical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Coil Flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Horizontal Right Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Horizontal Left Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
PC Series Upflow Coil Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Horizontal Left or Right application (Right Shown) . . . . . . . . . . . . . . 8
Combustible Floor Base Accessory . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Horizontal Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Typical Attic Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Typical Suspended Furnace / Crawl Space Installation . . . . . . . . . . . 9
Downflow Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Downflow Installation - Gas Valve Rotation . . . . . . . . . . . . . . . . . . . . 9
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Side Return Cutout Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Upflow/Downflow Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Horizontal Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Thermostat Chart - Single Stage Air Conditioner –
Variable Speed or PSC Modulating Furnace . . . . . . . . . . . . . . . . . .14
Thermostat Chart - Two Stage Air Conditioner –
Variable Speed or PSC Modulating Furnace . . . . . . . . . . . . . . . . . .15
Thermostat Chart - Two Stage Air Conditioner with Single Stage
Thermostat – Variable Speed or PSC Modulating Furnace . . . . . . . 16
Thermostat Chart - Single Stage Heat Pump –
Variable Speed or PSC Modulating Furnace . . . . . . . . . . . . . . . . . .17
Thermostat Chart - Single Stage Heat Pump –
Variable Speed or PSC Modulating Furnace . . . . . . . . . . . . . . . . . .18
Thermostat Chart - Two Stage Heat Pump –
Variable Speed or PSC Modulating Furnace . . . . . . . . . . . . . . . . . .19
Combustion Air Inducer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Combustion Airflow Path Through The Furnace
Casing to the Burner Compartment . . . . . . . . . . . . . . . . . . . . . . . . .20
Outside and Ambient Combustion Air . . . . . . . . . . . . . . . . . . . . . . . . 21
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Furnace Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
LIST OF TABLES
Unit Clearances to Combustibles . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Coil Projection Dimensions - PC Series Coils . . . . . . . . . . . . . . . . . . 6
Cabinet and Duct Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Recommended Filter Sizes (High Velocity 600 FPM) . . . . . . . . . . . . 8
High Altitude Orifices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Ratings & Physical / Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . 10
Estimated Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Unconfined Space Minimum Area in Square Inch . . . . . . . . . . . . . .19
Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Gas Rate (CU FT/HR) at Full Input . . . . . . . . . . . . . . . . . . . . . . . . . .22
Inlet Gas Pressure Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
Nominal Manifold Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Cooling Airflow - A/C Capacity in Tons . . . . . . . . . . . . . . . . . . . . . . . 24
These high efficiency, compact units employ induced combustion, reli-
able hot surface ignition and high heat transfer aluminized tubular heat
exchangers. The units are factory shipped for installation in upflow or
horizontal applications and may be converted for downflow applica-
tions.
These furnaces are designed for residential installation in a basement,
closet, alcove, attic, recreation room or garage and are also ideal for
commercial applications. All units are factory assembled, wired and
tested to assure safe dependable and economical installation and oper-
ation.
These units are Category I listed and may be common vented with
another gas appliance as allowed by the National Fuel Gas Code.
SECTION I: SAFETY
This is a safety alert symbol. When you see this symbol on
labels or in manuals, be alert to the potential for personal
injury.
Understand and pay particular attention to the signal words DANGER,
WARNING, or CAUTION.
DANGER indicates an imminently hazardous situation, which, if not
avoided, will result in death or serious injury
.
WARNING indicates a potentially hazardous situation, which, if not
avoided, could result in death or serious injury
.
CAUTION indicates a potentially hazardous situation, which, if not
avoided may result in minor or moderate injury.
It is also used to
alert against unsafe practices and hazards involving only property dam-
age.
Improper installation may create a condition where the operation of
the product could cause personal injury or property damage.
Improper installation, adjustment, alteration, service or mainte-
nance can cause injury or property damage. Failure to carefully
read and follow all instructions in this manual can result in fur-
nace malfunction, death, personal injury and/or property dam-
age. Only a qualified contractor, installer or service agency should
install this product.
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Summary of Contents

Page 1 - INSTALLATION MANUAL

368261-UIM-A-0508EFFICIENCYRATINGCERTIFIEDISO 9001Certified QualityManagement SystemRESIDENTIAL GAS FURNACE WITH PSC MOTORMODELS:TM8M/TMLM*MP, YM8M/Y

Page 2

368261-UIM-A-050810 Johnson Controls Unitary ProductsHIGH ALTITUDE NATURAL GAS ORIFICE CONVERSIONThe National Fuel Gas Code requires that gas applianc

Page 3

368261-UIM-A-0508Johnson Controls Unitary Products 11SUPPLY VOLTAGE CONNECTIONS1. Provide a power supply separate from all other circuits. Installover

Page 4 - SECTION II: DUCTWORK

368261-UIM-A-050812 Johnson Controls Unitary ProductsFor additional connection diagrams for all UPG equipment refer to “Low Voltage System Wiring” doc

Page 5 - Mounting Plate

368261-UIM-A-0508Johnson Controls Unitary Products 13 FIGURE 21: Thermostat Chart - Two Stage Air Conditioner – Variable Speed or PSC Modulating Furn

Page 6

368261-UIM-A-050814 Johnson Controls Unitary Products FIGURE 22: Thermostat Chart - Two Stage Air Conditioner with Single Stage Thermostat – Variabl

Page 7 - RIGHT SIDE VENT

368261-UIM-A-0508Johnson Controls Unitary Products 15 FIGURE 23: Thermostat Chart - Single Stage Heat Pump – Variable Speed or PSC Modulating Furnace

Page 8 - SECTION III: FILTERS

368261-UIM-A-050816 Johnson Controls Unitary Products FIGURE 24: Thermostat Chart - Single Stage Heat Pump – Variable Speed or PSC Modulating Furnace

Page 9 - SECTION IV: GAS PIPING

368261-UIM-A-0508Johnson Controls Unitary Products 17 FIGURE 25: Thermostat Chart - Two Stage Heat Pump – Variable Speed or PSC Modulating FurnaceORe

Page 10 - SECTION V: ELECTRICAL POWER

368261-UIM-A-050818 Johnson Controls Unitary ProductsACCESSORY CONNECTIONSThe furnace control will allow power-switching control of various acces-sori

Page 11

368261-UIM-A-0508Johnson Controls Unitary Products 19An unconfined space is not less than 50 cu.ft (1.42 m3) per 1,000 Btu/hr (0.2928 kW) input rating

Page 12 - 368261-UIM-A-0508

368261-UIM-A-05082 Johnson Controls Unitary ProductsSPECIFIC SAFETY RULES AND PRECAUTIONS1. Only Natural gas or Propane (LP) gas are approved for use

Page 13

368261-UIM-A-050820 Johnson Controls Unitary Products2. One permanent openings, commencing within 12 in (30.5 mm)ofthe top of the enclosure shall be p

Page 14

368261-UIM-A-0508Johnson Controls Unitary Products 216. Remove the burner assembly. It should be possible to swing theburner assembly out of the way w

Page 15

368261-UIM-A-050822 Johnson Controls Unitary ProductsTable 10: Gas Rate (CU FT/HR) at Full InputSeconds For 1 RevolutionSize of Test DialSeconds For 1

Page 16

368261-UIM-A-0508Johnson Controls Unitary Products 23ADJUSTMENT OF MANIFOLD GAS PRESSURE* The gas line pressure MUST BE• 7” W.C. (1.74 kPA) for Natura

Page 17

368261-UIM-A-050824 Johnson Controls Unitary ProductsADJUSTMENT OF FAN CONTROL SETTINGSCooling - The airflow delivered by the furnace during cooling o

Page 18 - SECTION VII: VENT SYSTEM

368261-UIM-A-0508Johnson Controls Unitary Products 25PRESSURE CONTROLSPressure Sensor - This furnace is equipped with a pressure sensor inthe burner c

Page 19

368261-UIM-A-050826 Johnson Controls Unitary ProductsThree Red Flashes - Stuck open pressure switch. This indicates thatthe pressure switch is open wh

Page 20 - ADJUSTMENTS

368261-UIM-A-0508Johnson Controls Unitary Products 27SECTION XI: REPLACEMENT PARTS LISTDESCRIPTIONMOTORMOTOR, DIRECT DRIVE BLOWERBLOWER, COMBUSTIONELE

Page 21

Subject to change without notice. Printed in U.S.A. 368261-UIM-A-0508Copyright © 2008 by Johnson Controls, Inc. All rights reserved. Supersedes: Nothi

Page 22

368261-UIM-A-0508Johnson Controls Unitary Products 3CODES AND STANDARDSFollow all national, local codes and standards in addition to this installa-tio

Page 23

368261-UIM-A-05084 Johnson Controls Unitary ProductsFURNACE LOCATION AND CLEARANCESThe furnace shall be located using the following guidelines:1. Wher

Page 24 - SECTION IX: SAFETY CONTROLS

368261-UIM-A-0508Johnson Controls Unitary Products 5DUCT FLANGESFour flanges are provided to attach ductwork to the furnace. Theseflanges are rotated

Page 25 - DIAGNOSTICS

368261-UIM-A-05086 Johnson Controls Unitary ProductsFor horizontal left hand applications no conversion is required to an MCcoil when used with a down

Page 26 - RETRIEVAL

368261-UIM-A-0508Johnson Controls Unitary Products 7BOTTOM RETURN AND ATTIC INSTALLATIONSBottom return applications normally pull return air through a

Page 27

368261-UIM-A-05088 Johnson Controls Unitary ProductsSECTION III: FILTERSFILTER INSTALLATIONAll applications require the use of a field installed filte

Page 28 - SECTION XII: WIRING DIAGRAM

368261-UIM-A-0508Johnson Controls Unitary Products 9HORIZONTAL APPLICATIONHorizontal FiltersAny branch duct (rectangular or round duct) attached to th

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