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INSTALLATION MANUAL
RESIDENTIAL GAS FURNACE MODELS
TM8T*MP, TMLT*MP - 80% AFUE
(Two Stage PSC Multi-position / Low NOx)
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
ELECTRICAL POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
TWINNING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Duct Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Vertical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Coil Flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Horizontal Right Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Horizontal Left Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
PC Series Upflow Coil Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Horizontal Left or Right application (Right Shown) . . . . . . . . . . . . . . 7
Combustible Floor Base Accessory . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Horizontal Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical Attic Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Typical Suspended Furnace / Crawl Space Installation . . . . . . . . . . . 8
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Side Return Cutout Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Unit Clearances to Combustibles . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Coil Projection Dimensions - PC Series Coils . . . . . . . . . . . . . . . . . . 6
Cabinet and Duct Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Recommended Filter Sizes (High Velocity 600 FPM) . . . . . . . . . . . . 9
Nominal Manifold Pressure - High Fire . . . . . . . . . . . . . . . . . . . . . . 11
Nominal Manifold Pressure - Low Fire . . . . . . . . . . . . . . . . . . . . . . . 11
Ratings & Physical / Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . 12
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.
LIST OF SECTIONS
VENT SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
START-UP AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SAFETY CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
REPLACEMENT PART CONTACT INFORMATION . . . . . . . . . . . . 27
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
LIST OF FIGURES
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Two Stage PSC Furnaces . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Two Stage PSC Furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Typical Twinned Furnace Application . . . . . . . . . . . . . . . . . . . . . . . . 15
Single Wire Twinning Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . 16
Combustion Air Inducer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Casing to the Burner Compartment . . . . . . . . . . . . . . . . . . . . . . . . . 17
Outside and Ambient Combustion Air . . . . . . . . . . . . . . . . . . . . . . . . 18
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Reading Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Furnace Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
LIST OF TABLES
Estimated Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Unconfined Space Minimum Area . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Gas Rate (CU FT/HR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Inlet Gas Pressure Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Nominal Manifold Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Blower Performance CFM - Any Position - CFM . . . . . . . . . . . . . . . 24
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.
521271-UIM-D-1211
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Summary of Contents for Johnson Controls TM8T*MP
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Page 1: Table Of Contents
INSTALLATION MANUAL RESIDENTIAL GAS FURNACE MODELS TM8T*MP, TMLT*MP – 80% AFUE (Two Stage PSC Multi-position / Low NOx) LIST OF SECTIONS SAFETY ..........1 VENT SYSTEM . - Page 2 11. The size of the unit should be based on an acceptable heat loss calculation for the structure. ACCA, Manual J or other approved tions in the manuals and on the labels attached to the unit and methods may be used. other safety precautions that may apply. Johnson Controls Unitary Products...
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Page 3: Safety
In some instances these instructions exceed certain local codes and ordinances, especially those who have not kept up with changing residential and non-HUD modular home construction practices. These instructions are required as a minimum for a safe installation. Johnson Controls Unitary Products... -
Page 4: Unit Clearances To Combustibles
1. Special floor base or air conditioning coil required for use on combustible floor. 2. Line contact only permitted between lines formed by the intersection of the rear panel and side panel (top in horizontal position) of the furnace jacket and building joists, studs or framing. Johnson Controls Unitary Products... -
Page 5: Ductwork
This access cover shall be attached in such a manner as to prevent leaks. Johnson Controls Unitary Products... -
Page 6: Vertical Applications
3-1/2 Mounting Plate PC24 4-1/2 PC30, PC32, PC35 4-1/2 PC42, PC43, PC36, PC37 5-1/2 PC48 6-1/2 PC60 Furnace Dimension “C” should be at least 2/3 of dimension “D”. See Figure 6. FIGURE 4: Horizontal Right Application Johnson Controls Unitary Products... -
Page 7: Horizontal Left Or Right Application (Right Shown)
18” (45.7 cm) 12” Openings is from the Recommended furnace 12” COMBUSTIBLE FLOOR 30” MIN. BASE ACCESSORY Work Area Return FIGURE 8: Combustible Floor Base Accessory Sediment Trap FIGURE 10: Typical Attic Installation Johnson Controls Unitary Products... -
Page 8: Typical Attic Installation
Maintain a 6” (15.2 cm) minimum clearance between the front of the furnace and the support rods or straps. Johnson Controls Unitary Products... -
Page 9: Filters
CFM greater than 1800, you may use two side returns or one side and the cut the opening larger than the dimensions shown in Figure 12. bottom or one return with a transition to allow use of a 20x25 filter. Johnson Controls Unitary Products... -
Page 10: Gas Piping
1/2 psig (3.5 kPa). Gas piping may be connected from either side of the furnace using any of the gas pipe entry on both sides of the furnace. Refer to Figure 12. Johnson Controls Unitary Products... -
Page 11: Electrical Power
63°F (35°C) rise wire when installed in accordance with instructions. Refer to Table 7 in these instructions for specific furnace electrical data. The residential supply must have a bonded neutral. Johnson Controls Unitary Products... -
Page 12: Ratings & Physical / Electrical Data
The transformer may provide power for an panel. After making the wiring connections replace the wiring box air conditioning unit contactor. cover and screws. Refer to Figure 16. Johnson Controls Unitary Products... -
Page 13: Thermostat Chart - Two Stage Ac With Two Stage Psc Furnaces
521271-UIM-D-1211 For additional connection diagrams for all Johnson Controls Unitary Products’ equipment refer to “Low Voltage System Wiring” document available on-line at www.upgnet.com in the Product Catalog Section. AC 15A Two Stage Air Conditioner - Two Stage PSC Furnace ID MODELS... -
Page 14: Thermostat Chart - Two Stage Hp With Two Stage Psc Furnace
265903 = 031-09168 340512 = 031-09178 Source is Fossil Fuel 449573 Thermostat Installer Setup 0210-External Fossil Fuel Kit- m ust be set to 1 FIGURE 18: Thermostat Chart - Two Stage HP with Two Stage PSC Furnace Johnson Controls Unitary Products... -
Page 15: Twinning
See typical application, Figure 20. furnace blower. To ensure stable communication, the common terminal of each control must be connected. Johnson Controls Unitary Products... -
Page 16: Vent System
1CK0603 or 1CK0604 must be used. Refer to the bustion air to enter the burner compartment. instructions with the kit to properly apply these masonry chimney kits. Johnson Controls Unitary Products... -
Page 17: Combustion Airflow Path Through The Furnace Casing To The Burner Compartment
A confined space is an area with less than 50 cu.ft (1.42 m ) per 1,000 Btu/hr (0.2928 kW) input rating for all of the appliances installed in that area. The following must be considered to obtain proper air for combus- tion and ventilation in confined spaces. Johnson Controls Unitary Products... -
Page 18: Outside And Ambient Combustion Air
1 square in per 3000 Btu per hour (7.3 cm per kW) of the total input rating of all equipment located in the enclosure. Not less than the sum of all vent connectors in the confined space. Johnson Controls Unitary Products... -
Page 19: Start-Up And Adjustments
With the burner assembly out of the way, simply slide the NOx screens out of the heat exchanger tubes and discard the screens. Replace all components in reverse order. Reconnect all wiring. Johnson Controls Unitary Products... - Page 20 Burner ignition may not be satisfactory on first startup due to resid- ual air in the gas line or until gas manifold pressure is adjusted. The ignition control will make 3 attempts to light before locking out. Johnson Controls Unitary Products...
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Page 21: Gas Rate (Cu Ft/Hr)
Size of Test Dial Seconds For Seconds For 1 Revolution 1 Revolution 1 Cu Ft 2 Cu Ft 5 Cu Ft 1 Cu Ft 2 Cu Ft 5 Cu Ft 1800 1636 1500 1385 1286 1200 1125 1059 1000 Johnson Controls Unitary Products... -
Page 22: Gas Valve
The cap for the pressure regulator must be removed entirely to gain port for leakage using an approved non-corrosive gas leak detec- access to the adjustment screw. Loosening or tightening the cap tion fluid, or other non-flammable leak detection methods. does not adjust the flow of gas. Johnson Controls Unitary Products... -
Page 23: Reading Gas Pressure
Carbon Monoxide, a fire hazard, personal injury, property damage, and/or death. CONTINUOUS FAN SPEED JUMPER BLOWER OFF DELAY JUMPER DIAGNOSTIC ERROR CODE RETRIEVAL BUTTON HUMIDIFIER TERMINAL ELECTRONIC AIR CLEANER TERMINA FIGURE 26: Furnace Control Board Johnson Controls Unitary Products... -
Page 24: Blower Performance Cfm - Any Position - Cfm
1162 1101 1042 NOTES: 1. Airflow expressed in standard cubic feet per minute (CFM). 2. Motor voltage at 115 V. 3. Airflow through motor side (right side) may be slightly less than the data shown above. Johnson Controls Unitary Products... -
Page 25: Safety Controls
Y2 terminals on the board, the blower will operate on LOW COOL Never adjust pressure switch to allow furnace operation. speed when Y1 is energized and on HI COOL speed when Y1 and Y2 are energized. Johnson Controls Unitary Products... -
Page 26: Furnace Control Diagnostics
Flash error code. See the description of “5 Red Flashes” and “11Red Flashes” below. If the main limit switch opens five times within a single call for heat, the control will indicate 4 Red Flashes and will enter a one-hour soft lock- out. Johnson Controls Unitary Products... -
Page 27: Replacement Parts List
3. Customer Service contact information. a. Click on the “Brand Links” button b. Click on the “Customer Service” button • You can contact us by mail. Just send a written request to: Johnson Controls Unitary Products Consumer Relations 5005 York Drive Norman, OK 73069... -
Page 28: Wiring Diagram
SECTION XI: WIRING DIAGRAM FIGURE 27: Wiring Diagram Subject to change without notice. Published in U.S.A. 521271-UIM-D-1211 Copyright © 2011 by Johnson Controls, Inc. All rights reserved. Supersedes: 521271-UIM-C-0910 Johnson Controls Unitary Products 5005 York Drive Norman, OK 73069...