Safety Considerations
IMPORTANT NOTE:
This unit is designed to meet the NOX
requirement of 14Ng/J maximum as required by the South
Coast Air Quality Management District and the San Joaquin
Valley Air Pollution Control District, both in the State of Cal-
ifornia,and is intended for installation in those districts only.
This unit has a Control System that compensates for certain
installation and environmental conditions. This unit must:
•
Be properly installed, operated, and maintained per
the instructions.
•
Be serviced only by properly trained service
technicians.
This unit is not approved for use with gasses other than
Natural Gas.
Units that are not installed, maintained, or operated properly
may result in “noisy” operation during the heating cycle. If
this unit is making unusual or objectionable noises during
the heating cycle, turn the heat off at the thermostat and
contact a qualified service organization right away.
Vent Pipe Connection ...........................................
12
Combustion Air Pipe Connection ........................
12
Alternate Vent & Intake Pipe Connections .......13
Pipe Termination ....................................................
14
Side Wall Vent Kit .................................................
16
Condensate Drain Lines & Drain Trap ..................
17
General Drain Information .................................
17
Field Supplied Drain .............................................
17
Upflow Model Installed Vertically ...................
17
Drain Exiting Right Side ......................................
18
Drain Exiting Left Side .........................................
18
Upflow Model Installed Horizontally w/ Right Side
Down ................................................................................
18
Upflow Model Installed Horizontally w/ Left Side
Down ..............................................................................
19
Upflow Model Installed Horizontally w/ Left
Side Down - Alternate ..........................................
19
Electrical Connections ..........................................
20
Wiring Harness .....................................................
20
115 Volt Line Connections ...................................
20
Junction Box Relocation .....................................
20
24 Volt Thermostat Wiring ..................................
21
Single-Stage Heating Thermostat Application .
21
Fossil Fuel Applications ......................................
21
Gas Supply and Piping..............................................
21
Gas Piping Connections .......................................
22
Circulating Air & Filters .........................................23
Duct work - Air Flow ...........................................23
Checking Duct Static ...........................................23
Bottom Return Air Opening [Upflow Models] ..
24
Filters - Read This Section Before Installing
The Return Air Duct work ...............................
24
Upright Installations ...........................................
25
Horizontal Installations .....................................
25
Drain Trap Priming ...............................................
25
Furnace Operation ...............................................
25
Gas Supply Pressure Measurement...................
25
Gas Manifold Pressure Measurement and Adjust
-
ment .........................................................................
26
Gas Input Rate Measurement (Natural Gas Only)
27
Temperature Rise ..................................................
27
Circulator Blower Speeds .................................
27
Blower Heat Off Delay Timings ..........................
28
Normal Sequence of Operation .............................
28
Power Up ................................................................
28
Heating Mode .........................................................
28
Cooling Mode ........................................................
28
Fan Only Mode .......................................................
29
Operational Checks .................................................
29
Safety Circuit Description .....................................
29
Integrated Control Module ...............................
29
Primary Limit ..........................................................
29
Auxiliary Limit ........................................................
29
Burner Temperature Switch ...............................
29
Pressure Switches ...............................................
29
Flame Sensor ........................................................
29
Troubleshooting ......................................................
29
Electrostatic Discharge (ESD) Precautions ...
29
Resetting From Lockout .....................................30
Maintenance ..............................................................30
Annual Inspection .................................................30
Filters .....................................................................30
Burner ....................................................................31
Induced Draft and Circulator Blowers ...........31
Condensate Trap and Drain System (Qualified
Servicer Only) .......................................................31
Flame Sensor (Qualified Servicer Only) ...........31
Flue Passages (Qualified Servicer Only) ..........31
Before Leaving an Installation ..............................31
Repair and Replacement Parts ..............................31
Diagnostic Chart .....................................................32
Airflow *MES96*** ..................................................34
Wiring Diagram *MES96*** ......................................35
Adhere to the following warnings and cautions when install
-
ing, adjusting, altering, servicing, or operating the furnace.
To ensure proper installation and operation, thoroughly read
this manual for specifics pertaining to the installation and
application of this product.
This furnace is manufactured for use with natural gas only.
Install this furnace only in a location and position as specified
in
LOCATION REQUIREMENTS & CONSIDERATIONS
section and INSTALLATION POSITIONS section
of this
manual.
Provide adequate combustion and ventilation air to the fur
-
nace as specified in
COMBUSTION & VENTILATION AIR
REQUIREMENTS section of this manual.
Combustion products must be discharged to the outdoors.
Connect this furnace to an approved vent system only, as
specified in
VENT/FLUE PIPE & COMBUSTION AIR PIPE
section of this manual.
