58MCA
4-Way Multipoise Fixed-Capacity
Direct-Vent Condensing Gas Furnace
Installation, Start-Up, and Operating Instructions
For Sizes 040-140, Series 170
NOTE: Read the entire instruction manual before starting the
installation.
This symbol → indicates a change since the last issue.
Index Page
DIMENSIONAL DRAWING........................................................2
SAFETY CONSIDERATIONS.....................................................3
Clearances to Combustibles......................................................4
ELECTROSTATIC DISCHARGE (ESD) PRECAUTIONS........5
INTRODUCTION..........................................................................5
APPLICATIONS ......................................................................6-12
General ......................................................................................6
Upflow Applications..............................................................6-7
Downflow Applications.........................................................7-9
Horizontal Left (Supply-Air Discharge) Applications.......9-10
Horizontal Right (Supply-Air Discharge) Applications...10-12
LOCATION ............................................................................12-13
General ....................................................................................12
Furnace Location Relative to Cooling Equipment ................13
Hazardous Locations...............................................................13
INSTALLATION....................................................................13-14
Leveling Legs (If Desired)................................................13-14
Installation In Upflow and Downflow Applications .............14
Installation In Horizontal Applications..................................14
AIR DUCTS............................................................................14-19
General ....................................................................................14
Ductwork Acoustical Treatment.............................................16
Supply Air Connections ....................................................16-17
Return Air Connections..........................................................17
Filter Arrangement..................................................................17
Bottom Closure Panel.............................................................18
Gas Piping..........................................................................18-19
ELECTRICAL CONNECTIONS...........................................19-20
115-v Wiring......................................................................19-20
24-v Wiring.............................................................................20
Accessories..............................................................................20
DIRECT VENTING ...............................................................20-30
Removal of Existing Furnaces from
Common Vent Systems.....................................................23
Combustion-Air and Vent Piping .....................................23-29
Concentric Vent and Combustion-Air Termination
Kit Installation..............................................................29-30
Multiventing and Vent Termination.......................................30
CONDENSATE DRAIN ........................................................30-34
General...............................................................................30-32
Application..............................................................................32
Condensate Drain Protection.............................................32-34
SEQUENCE OF OPERATION..............................................34-36
Heating Mode..........................................................................34
Cooling Mode....................................................................34-35
Continuous Blower Mode.......................................................35
Heat Pump Mode....................................................................35
Component Test.................................................................35-36
START-UP PROCEDURES ..................................................36-44
General ....................................................................................36
Prime Condensate Trap With Water......................................36
Purge Gas Lines......................................................................36
Adjustments .......................................................................36-44
Set Gas Input Rate ............................................................36-44
Set Temperature Rise..............................................................44
Blower Off Delay (Heat Mode).............................................44
Set Thermostat Heat Anticipator............................................44
CHECK SAFETY CONTROLS..................................................44
Check Primary Limit Control.................................................44
Check Pressure Switch ...........................................................44
CHECKLIST ................................................................................45
A93040
ama
CERTIFIED
As an ENERGY STAR®
Partner, Carrier Corpora-
tion has determined that
this product meets the EN-
ERGY STAR® guidelines
for energy efficiency.
REGISTERED QUALITY SYSTEM
Fig. 1—Multipoise Orientations
A93041
UPFLOW
DOWNFLOW
HORIZONTAL
LEFT
AIRFLOW
AIRFLOW
AIRFLOW
AIRFLOW
HORIZONTAL
RIGHT
Visit www.carrier.com
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 6a 8a
PC 101 Catalog No. 535-80091 Printed in U.S.A. Form 58MCA-10SI Pg 1 12-02 Replaces: 58MCA-9SI
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