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INSTALLATION MANUAL
MANUFACTURED HOUSING OR MODULAR
HOME GAS FURNACE
MODELS:
MG9S*MP - 33" Models -
(95.5% AFUE Single Stage Multi-position)
SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
ELECTRICAL POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
VENTING CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Duct Attachment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Attachment to Structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Combustible Floor Base Accessory . . . . . . . . . . . . . . . . . . . . . . . 6
Mobile Home Filter Frame Accessories . . . . . . . . . . . . . . . . . . . . 6
Blend Air Bracket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Blend Air Installation (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Vertical Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Coil Flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
PC Series Upflow Coil Installation . . . . . . . . . . . . . . . . . . . . . . . . 8
Combustible Floor Base Accessory . . . . . . . . . . . . . . . . . . . . . . . 8
Downflow Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Dimensions (Upflow configuration shown) . . . . . . . . . . . . . . . . . 9
Side Return Cutout Markings . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Upflow/Downflow Gas Piping . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Electrical Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Line Wiring Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Single Stage Heat Thermostat Connections . . . . . . . . . . . . . . . 12
Accessory Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Unit Clearances to Combustibles . . . . . . . . . . . . . . . . . . . . . . . . 4
Coil Projection Dimensions - PC Series Coils . . . . . . . . . . . . . . . 8
Cabinet and Duct Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Recommended Filter Sizes (High Velocity 600 FPM) . . . . . . . . . 9
Nominal Manifold Pressure - High Fire . . . . . . . . . . . . . . . . . . . 11
Ratings & Physical / Electrical Data . . . . . . . . . . . . . . . . . . . . . 12
Maximum Equivalent Pipe Length . . . . . . . . . . . . . . . . . . . . . . . 17
Elbow Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Equivalent Length of Fittings . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
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 downflow
applications and may be converted for upflow applications.
Shipped in Downflow Configuration
LIST OF SECTIONS
LIST OF FIGURES
LIST OF TABLES
COMBUSTION AIR and VENT SYSTEM . . . . . . . . . . . . . . . . . 17
START-UP AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . 23
SAFETY CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
NORMAL OPERATION AND DIAGNOSTICS . . . . . . . . . . . . . 29
REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . 31
REPLACEMENT PART CONTACT INFORMATION . . . . . . . . 31
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Typical. Condensate drain, vertical installation . . . . . . . . . . . . . 13
Typical. Combustion Pipe Drain Tee . . . . . . . . . . . . . . . . . . . . . 14
Upflow Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Downflow Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Home Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Termination Configuration - 2 Pipe . . . . . . . . . . . . . . . . . . . . . . 20
Termination Configuration - 2 Pipe Basement . . . . . . . . . . . . . 20
and Vent Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
and Vent Termination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Direct Vent Air Intake Connection and Vent Connection . . . . . . 21
Outside and Ambient Combustion Air . . . . . . . . . . . . . . . . . . . . 22
Attic and Crawl Space Combustion Air Termination . . . . . . . . . 23
Gas Valve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Reading Gas Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Furnace Control Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Furnace Control Event Schedule . . . . . . . . . . . . . . . . . . . . . . . 31
Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Size at Furnace (All Models) . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Estimated Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Unconfined Space Minimum Area in Square Inch . . . . . . . . . . . 21
Free Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Gas Rate (CU FT/HR) at Full Input . . . . . . . . . . . . . . . . . . . . . . 25
Inlet Gas Pressure Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Nominal Manifold Pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
These furnaces are designed for residential installation in a basement,
closet, alcove, attic, recreation room or garage applications. All units
are factory assembled, wired and tested to assure safe dependable and
economical installation and operation.
These units are Category IV listed and may not be common vented with
another gas appliance as allowed by the National Fuel Gas Code.
EFFICIENCY
RATING
CERTIFIED
ISO 9001
Certified Quality
Management System
420705-UIM-C-0310
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Related Manuals for Johnson Controls MG9S*MP
Summary of Contents for Johnson Controls MG9S*MP
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Page 1: Table Of Contents
INSTALLATION MANUAL MANUFACTURED HOUSING OR MODULAR HOME GAS FURNACE MODELS: EFFICIENCY RATING CERTIFIED MG9S*MP - 33” Models – Shipped in Downflow Configuration ISO 9001 Certified Quality (95.5% AFUE Single Stage Multi-position) Management System LIST OF SECTIONS SAFETY ......... . . 2 COMBUSTION AIR and VENT SYSTEM . -
Page 2: Safety
• Proper vent installation; • Provide clearances from combustible materials as listed under • Furnace operating under thermostatic control; Clearances to Combustibles in Table 1. Johnson Controls Unitary Products... -
Page 3: Combustion Air Quality
• Chlorine based swimming pool chemicals modular home construction practices. These instructions are required • Water softening chemicals as a minimum for a safe installation. • De-icing salts or chemicals Johnson Controls Unitary Products... -
Page 4: Unit Clearances To Combustibles
* - 24" clearance in front and 18" on side recommended for service access. when the appliance is not using outdoor combustion air). All furnaces approved for alcove installation. Where it will not interfere with proper air circulation in the confined space. Johnson Controls Unitary Products... -
Page 5: Ductwork
Drain exchanger OVERHEATING CONDITION. This condition can result in premature heat exchanger failure, which can result in personal injury, property damage, or death. SUPPLY AIR DUCT FIGURE 2: Attachment to Structure Johnson Controls Unitary Products... -
Page 6: Combustible Floor Base Accessory
The internal bottom panel must be removed for this application. Attic installations must meet all minimum clearances to combustibles and have floor support with required service accessibility. Johnson Controls Unitary Products... -
Page 7: Blend Air Bracket
Blend Air Damper Factory Flange Blend Air Bracket (3500-5241) Location(Used for mounted to wall next to furnace upflow installations) Alternate Flange Location FIGURE 6: Blend Air Installation (Optional) (Used for downflow installations) FIGURE 8: Coil Flange Johnson Controls Unitary Products... -
Page 8: Pc Series Upflow Coil Installation
The coil assembly must be located in the duct such that a minimum dis- tance is maintained between the top of the coil and the top of the duct. FIGURE 11: Downflow Venting Refer to Table 6. Johnson Controls Unitary Products... -
Page 9: Filters
2. Do not exceed 1800 CFM using a single side return and a 16x25 filter. For CFM greater than 1800, you may use two side returns or one side and the bottom or one side return with a transition to allow use of a 20x25 filter. Johnson Controls Unitary Products... -
Page 10: Gas Piping
Refer to connected to which terminals Figure 12. Remove the screws that attach the gas manifold to the burner sup- port box. Remove and discard natural gas orifices. Johnson Controls Unitary Products... -
Page 11: Electrical Power
Field wiring to the unit must be grounded. Electric wires that are field installed shall conform to the temperature limitation for 63°F (35°C) rise wire when installed in accordance with instructions. Refer to Table 6 in these instructions for specific furnace electrical data. Johnson Controls Unitary Products... -
Page 12: Electrical Wiring
Route the furnace leads into the box using a protective bushing where the wires pass through the furnace FIGURE 18: Single Stage Heat Thermostat Connections panel. After making the wiring connections replace the wiring box cover and screws. Refer to Figure 16. Johnson Controls Unitary Products... -
Page 13: Condensate Piping And Furnace Venting Configuration
A loop has been added to the pressure switch vacuum hose. How- No hose clamps are needed for connecting to the condensate pan. ever, ensure that all pressure switch hoses are routed such that they prevent any condensate from entering the pressure switch. Johnson Controls Unitary Products... -
Page 14: Typical. Combustion Pipe Drain Tee
Tee with Drain Trap Trap Liquid anti-freeze will cause damage to internal plastic parts of this furnace. DO NOT attempt to winterize the furnace using liquid Connect to Drain anti-freeze. FIGURE 21: Typical. Combustion Pipe Drain Tee Johnson Controls Unitary Products... -
Page 15: Upflow Configuration
420705-UIM-C-0310 FIGURE 22: Upflow Configuration Johnson Controls Unitary Products... -
Page 16: Downflow Configuration
420705-UIM-C-0310 FIGURE 23: Downflow Configuration Johnson Controls Unitary Products... -
Page 17: Maximum Equivalent Pipe Length
3" Standard 3-1/16" have 65 equivalent feet of pipe, AND the combustion air intake can have another 65 equivalent feet of pipe. 2" Sweep 3-1/4" 3" Sweep 4-1/16" Dimensions are those required in Standard ASTM D-3311. Johnson Controls Unitary Products... -
Page 18: Equivalent Length Of Fittings
Seal around the openings where the combustion air and / or vent piping pass through the roof or sidewalls. COMBUSTION AIR / VENTING The vent must be installed with the minimum required clearances, and must comply with local codes and requirements. Johnson Controls Unitary Products... -
Page 19: Home Layout
20 inches (51 cm). It is recommended that a retaining type collar be used that is attached to the build- ing surface to prevent movement of the vent pipe. Johnson Controls Unitary Products... -
Page 20: Termination Configuration - 2 Pipe
Refer to Figure 20. combustion air intake and bottom of vent Maintain 12” minimumclearance above highest anticipated snow level or grade, whichever is higher FIGURE 27: Termination Configuration - 2 Pipe Basement Johnson Controls Unitary Products... -
Page 21: Direct Vent Air Intake Connection And Vent Connection
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 22: Outside And Ambient Combustion Air
1 square in per 3000 Btu per hour (6.45 cm3 per 0.879 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 23: Start-Up And Adjustments
The furnace must be isolated from the gas supply piping system by All electrical connections made in the field and in the factory should be checked for proper tightness. closing the equipment shutoff valve during any pressure testing of the gas supply system. Johnson Controls Unitary Products... - Page 24 If orifice hole appears damaged or it is suspected to have been redrilled, check orifice hole with a numbered drill bit of correct size. Never redrill an orifice. A burr-free and squarely aligned orifice hole is essential for proper flame characteristics. Johnson Controls Unitary Products...
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Page 25: Gas Rate (Cu Ft/Hr) At Full Input
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 26: Gas Valve
FIGURE 34: Reading Gas Pressure NOTICE The regulated outlet pressure has been calibrated at the factory. Additional pressure adjustment should not be necessary. If adjust- ment is necessary, set to the following specifications. After adjust- ment, check for gas leakage. Johnson Controls Unitary Products... -
Page 27: Furnace Control Board
Figure 35. TWIN PARK PARK Blower Off Delay Timer Adjustment Jumper HI COOL (in seconds) HEAT EAC-H XFMR FIGURE 35: Furnace Control Board Johnson Controls Unitary Products... -
Page 28: Blower Performance Cfm - Any Position (Without Filter)
1341 1254 1180 1299 1261 1229 1177 1111 1053 NOTES: 1. Airflow expressed in standard cubic feet per minute (CFM). 2. Return air is through side opposite motor (left side). 3. Motor voltage at 115 V. Johnson Controls Unitary Products... -
Page 29: Safety Controls
To obtain a constant air circulation at lower flow rate, response. Then use the troubleshooting section in this manual to change the high-speed wire to another low speed wire. check the system’s operation. Johnson Controls Unitary Products... -
Page 30: Furnace Control Diagnostics
Low gas pressure, faulty gas valve, dirty or faulty flame sensor, faulty hot surface ignitor or burner problem may cause this. The furnace will lock out for one hour and then restart. Johnson Controls Unitary Products... -
Page 31: 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 32: Wiring Diagram
SECTION XII: WIRING DIAGRAM FIGURE 37: Wiring Diagram Subject to change without notice. Published in U.S.A. 420705-UIM-C-0310 Copyright © 2010 by Johnson Controls, Inc. All rights reserved. Supersedes: 420705-UIM-A-1209 Johnson Controls Unitary Products P.O. Box 19014 Wichita, KS 67204-9014...