Bard WG421 User manual

WARNING
READ ALL INSTRUCTIONS CAREFULLY BEFORE
BEGINNING THE INSTALLATION.
THE INSTALLATION MUST COMPLY WITH THESE
INSTRUCTIONS AND THE REQUIREMENTS OF ALL
GOVERNING CODES AND ORDINANCES FOR THE
INSTALLATION LOCATION.
IT IS THE RESPONSIBILITY OF INSTALLER TO KNOW
AND UNDERSTAND ALL OF THESE REQUIREMENTS.
FAILURE TO DO SO COULD CREATE A HAZARD
RESULTING IN PROPERTY DAMAGE, BODILY INJURY,
OR DEATH.
INSTALLATION
INSTRUCTIONS
WG - SERIES
COMBINATION GAS/ELECTRIC
WALL-MOUNT
MODELS:
WG421 WG481 WG601
Manual No.: 2100-365B
Supersedes: 2100-365A
File: Volume III, Tab 20
Date: 08-25-00
Bard Manufacturing Company
Bryan, Ohio 43506
Since 1914...Moving ahead, just as
planned.

CONTENTS
Getting Other Information and Publications...................... 1
WG Series Model Nomenclature ...................................... 2
Ventilation Options ............................................................ 2
Air Conditioning Module Options ...................................... 3
1. Important ..................................................................... 3
2. Application .................................................................. 3
3. Duct Work................................................................... 3
4. High Altitude Applications .......................................... 6
5. Transportation Damage .............................................. 6
6. Installation................................................................... 6
7. Wall Mounting............................................................. 7
8. Mounting the Unit ....................................................... 7
9. Clearances ................................................................ 13
10. Vent Terminal and Combustion Inlet Hood ............... 13
11. Optional Vertical Venting .......................................... 13
12. Vent Resizing Instructions........................................ 13
13. Fresh Air Intake ........................................................ 14
14. Condensate Drain ..................................................... 14
15. Wiring – Main Power ................................................ 14
16. Wiring – Low Voltage Wiring .................................... 16
17. Thermostats .............................................................. 16
18. Gas Supply & Piping ................................................ 19
19. Manifold Pressure Adjustment ................................. 20
20. Checking Gas Input Rate ......................................... 20
21. Standard Orifice Sizing & High Altitude Derate ....... 21
22. Conversion of Gas Input BTUH From High
to Low Rating ............................................................ 24
23. Measuring Air Temperature Rise .............................. 24
24. Filters ........................................................................ 25
25. Compressor Control Module..................................... 25
26. Lighting & Shutdown Instructions............................. 26
27. Service Agency Procedures ..................................... 27
28. Maintaining Unit in Good Working Order.................. 27
29. Replacement Parts ................................................... 28
30. Sequence of Operation – Heating ............................ 29
31. Sequence of Operation – Cooling............................. 29
32. Indoor Blower Operation ........................................... 30
33. Pressure Service Ports............................................. 36
34. RefrigerantCharge .................................................... 36
35. Fan Blade Setting Dimensions................................. 37
36. Low NOx Burner Assembly "N" Suffix Models
Only – U.S. Installations Only.................................. 37
Wiring Diagrams .......................................................38 - 49
Page Page
i.

CONTENTS
FIGURES
Figure 1 Unit Dimensions ............................................5
Figure 2 Vent Terminal & Combustion
Air Intake........................................................ 8
Figure 3 Internal Filter Access Through Upper
Service Door .................................................. 8
Figure 4 Mounting Instructions .................................... 9
Figure 5 Combustible Clearance ...............................10
Figure 6 Wall Mounting Instructions.......................... 11
Figure 7 Wall Mounting Instructions.......................... 11
Figure 8 Common Wall Mounting Installations .........12
Figure 9 Fresh Air Damper ........................................14
Figure 10 Installation of Flexible Conduit ....................16
Figure 11 Low Voltage Wiring...................................... 17
Figure 12 Gas Pipe Connection .................................. 18
Figure 13 Proper Piping Practice ................................ 19
Figure 14 Lighting & Shutdown Instruction Label .......26
Figure 15 Top View of Gas Control.............................. 27
Figure 16 Sequence of Operation – Electronic
Blower Control ............................................. 29
Figure 17 Furnace Control Board & Blower Control....30
Figure 18 460V Blower Motor Wiring Options............. 31
Figure 19 Fan Blade .................................................... 37
Figure 20 Low NOx Insert ............................................ 37
TABLES
Table 1 Specifications ................................................. 4
Table 2 Minimum Installation Clearances ................. 13
Table 3 Thermostat Wire Size................................... 16
Table 4 Wall Thermostat & Subbase Combinations. 16
Table 5 Length of Standard Pipe Threads................. 19
Table 6 Gas Pipe Sizes – Natural Gas..................... 19
Table 7 High Altitude Derate Charts – U.S.
Installations Only .......................................... 22
Table 8 High Altitude Derate Charts – Canadian
Installations Only .......................................... 23
Table 9 WG421 Indoor Blower Performance............. 32
Table 10 WG482 Indoor Blower Performance............. 33
Table 11 WG601 Indoor Blower Performance............. 34
Table 12 Integrated Furnace & Blower Control
Operation ...................................................... 35
Table 13 Cooling Pressure Table................................. 36
Table 14 Refrigerant Charge ........................................ 36
Table 15 Fan Blade Dimension ................................... 37
Page Page
ii.

Manual 2100-365
Page 1
Getting Other Information and Publications
For more information, contact these
publishers:
ACCA Air Conditioning Contractors of America
1712 New Hampshire Avenue, NW
Washington, DC 20009
Telephone: [phone]
ANSI American National Standards Institute
11 West Street, 13th Floor
New York, NY 10036
Telephone: [phone]
Fax: [phone]
ASHRAE American Society of Heating Refrigerating,
and Air Conditioning Engineers, Inc.
1791 Tullie Circle, NE.
Atlanta, GA 30329-2305
Telephone: [phone]
Fax: [phone]
NFPA National Fire Protection Association
Batterymarch Park
P.O. Box 9101
Quincy, MA 02269-9901
Telephone: [phone]
Fax: [phone]
CSA Canadian Standards Association
178 Rexdale Boulevard
Rexdale, Ontario
Canada. M9W 1R3
Telephone: [phone]
COPYRIGHT AUGUST, 2000
BARD MANUFACTURING COMPANY
BRYAN, OHIO 43506 USA
Manufactured under the following U.S. patent numbers:
5,485,878; 5,002,116; 4,924,934; 4,875,520; 4,4825,936; 4,432,409
These publications can help you install the furnace.
You can usually find these at your local library or
purchase them directly from the publisher. Be sure to
consult current edition of each standard.
National Fuel Gas Code.......ANSI Z223.1 / NFPA 54
National Electrical Code.................. ANSI / NFPA 70
Standard for the Installation ......... ANSI / NFPA 90A
of Air Conditioning and
Ventilating Systems
Standard for Warm Air ..................ANSI / NFPA 90B
Heating and Air Conditioning
Systems
Standard for Chimneys, .............................. NFPA 211
Fireplaces, Vents, and Solid
Fuel Burning Appliances
Load Calculation for ......................... ACCA Manual J
Residential Winter and
Summer Air Conditioning
Duct Design for Residential ............ACCA Manual D
Winter and Winter Air Conditioning
and Equipment Selection
Canadian Electrical Code ..........................CSA C22.1

Manual 2100-365
Page 2
WG 42 1 – A X C X X X X X X
WALL MOUNT GAS/ELECTRIC GENERAL
MODEL NUMBER NOMENCLATURE
sledoM106GW,184GW,124GW
noitpircseD dellatsnIyrotcaF .oNedoC dellatsnIyrotcaF .oNtraP
repmaDriAhserFcirtemoraBX5-DAFGW
etalPffO-knalBB5-POBGW
repmaDriAhserFdezirotoMM5-DAFMGW
nruteRgnirpS-rotalitneVlaicremmoCV5-SVRCGW
nruteRrewoP-rotalitneVlaicremmoCP5-PVRCGW
gnitaludoMylluF-rezimonocE jE5-MFIEGW
tloV032-rotalitneVyrevoceRygrenER5A-VREGW
tloV064-rotalitneVyrevoceRygrenER5C-VREGW
VENTILATION OPTIONS
1Low ambient control is required with economizer for low temperature compressor operation
MODEL
Wall Mount Gas/Electric CONTROL OPTIONS
(See Table page 3)
FEATURE
(-) =Standard
D =Dehumidification
C = Canadian Approval
VOLTAGE
A= 230/208-60-1
B= 230/208-60-3
C= 460-60-3 HEATING CAPACITY
A= 50,000
B= 75,000
C= 100,000
D= 125,000
VENT
(See Table
below)
COOLING CAPACITY
24 =2 ton
30= 2-1/2 ton
36= 3 ton
42= 3-1/2 ton
48= 4 ton
60= 5 ton
REVISION
1
EMISSIONS
X= Standard
N= NOx Certified
FILTER
X= 2” Pleated (Standard)
P= 1” Washable
COLOR
X= Beige
(Standard)
4 = Gray OUTLET
X= Front (Standard)
T=Top
COIL OPTIONS
X= Standard
1 = Phenolic coated evaporator
2 = Phenolic coated condenser
3 = Phenolic coated both coils

Manual 2100-365
Page 3
1. IMPORTANT
The equipment covered in this manual is to be
installed by trained, experienced service and
installation technicians. All duct work or portions
thereof not in the conditioned space should be
properly insulated in order to both conserve energy
and prevent condensation or moisture damage.
2. APPLICATION
This is a fan-assisted forced air gas furnace with
electric air conditioning for outdoor installation. A
fan-assisted furnace is equipped with an integral
mechanical means to draw products of combustion
through the combustion chamber and heat exchanger.
The furnace installation must conform with local
building codes and ordinances or, in their absence,
with the National Fuel Gas Code ANSI Z223.1 or
CAN/CGA-B149.1, latest edition, and the National
Electrical Code ANSI/NFPA-7 or CSA C22.1, latest
edition. It is the personal responsibility and
obligation of the purchaser to contact a qualified
installer to assure that installation is adequate and is
in conformance with governing codes and
ordinances.
3. DUCT WORK
The unit is designed for use with or without duct
work. See Warning on Page 6. Flanges are provided
for attaching the supply and return ducts. These
instructions explain the recommended method to
install the air cooled self-contained electric air
conditioning and gas heating unit and the electrical
wiring connections and gas piping to the unit. The
refrigerant system is completely assembled and
charged. All internal wiring is complete.
These instructions and any instructions packaged with
any separate equipment required to make up the entire
heating/cooling system should be carefully read
before beginning the installation. Note particularly
“Starting Procedure” and any tags and/or labels
attached to the equipment.
All duct work, supply and return, must be properly
sized for the design air flow requirement of the
equipment. Air Conditioning Contractors of America
(ACCA) is an excellent guide to proper sizing.
Refer to Table 9 for maximum static pressure
available for duct design.
AIR CONDITIONING MODULE OPTIONS
STD = Standard equipment.
1 CCM Compressor control module has adjustable 30 second to 5 minute delay-on-break
timer. On initial power up, or any time the power is interrupted, the delay-on-make
will be 2 minutes plus 10% of the delay-on-break setting. There is no delay-on-
make during routine operation of the unit. The module also provides the lockout
feature (with 1 retry) for high and/or low pressure controls, and a 2 minute timed
bypass for low pressure control.
2 HPC High pressure control is auto reset. Always used with compressor control module
(CCM) which is included. See note
1.
3 LPC Low pressure control is auto reset. Always used with compressor control module
(CCM) which is included. See note
1.
4 LAC Low ambient control permits cooling operation down to 0°F.
MCC jCPH kCPL lCAL m
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DTSDTS aG61-AMC
DTSDTS aa H81-AMC
DTSDTS aI6-AMC

Manual 2100-365 Page 4
*75 degree C Copper wire size
** Maximum time delay fuse or HACR Type circuit breaker
TABLE 1
SPECIFICATIONS
SNOITACIFICEPS
ledoMA-124GWB-124GWC-124GWA-184GWB-184GWC-184GWA-106GWB-106GWC-106GW
ZH06gnitaRlacirtcelE 1-06-802/0323-06-802/0323-06-0641-06-802/0323-06-802/0323-06-0641-06-802/0323-06-02/0323-06-064
egnaRegatloVgnitarepO352-791352-781605-414352-791352-781605-414352-791352-781605-414
yticapmAtiucriCmuminiM033211433221441351
*/eziSeriWdleiF884188418821
eziSeriWdnuorG010141010141010121
**.xaMesuFyaleD545351055351065402
rosserpmoC
epyTrosserpmoC.pceR.pceR.pceRllorcSllorcSllorcSllorcSllorcSllorcS
stloV802/032802/032802/032064802/032802/032802/032802/032064
spmAdaoLdetaR91/5.7131/216 5.12/1231/5.212.603/725.91/719
tnerruCnoitceleStiucriChcnarB9131622314.6035.919
spmArotoRkcoL201/20119/1924131/13118/1964961/961731/73126
rosserpmoCdnarotoMnaF
DPS/MPR/PHrotoMnaF2-058-3/12-058-3/11-058-3/12-058-3/12-058-3/11-058-3/12-058-3/12-058-3/11-058-3/1
spmArotoMnaF5.25.23.15.25.23.15.25.23.1
MFC/AIDnaF0072-"420072-"420072-"420072-"420072-"420072-"420072-"420072-"420072-"42
rotaropavEdnarotoM
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spmArotoMrewolB9.29.25.19.29.25.19.29.25.1
.P.S.E&gniooCMFC53.-003153.-003153.-003183.-055183.-055183.-055103.-056103.-056103.-0561
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.).zo22-R(egrahC 101101101611611611341341341

Manual 2100-365 Page 5
MIS-1352
FIGURE 1
UNIT DIMENSIONS

Manual 2100-365
Page 6
See Figure 5 and clearance information in Section 9
and Table 2 for additional information.
Design the duct work according to methods given by
the Air Conditioning Contractors of America
(ACCA). When duct runs through unheated spaces,
it should be insulated with a minimum of one inch of
insulation. Use insulation with a vapor barrier on the
outside of the insulation. Flexible joints should be
used to connect the duct work to the equipment in
order to keep the noise transmission to a minimum.
A one inch clearance to combustible material for the
first three feet of duct attached to the outlet air frame
is required. See Wall Mounting Instructions and
Figures 4 and 5 for further details.
Ducts through the walls must be insulated and all
joints taped or sealed to prevent air or moisture
entering the wall cavity.
Some installations may not require any return air
duct. A metallic return air grille is required with
installations not requiring a return air duct. The
spacing between louvers on the grille shall not be
larger than 5/8 inch.
Any grille that meets with the 5/8 inch louver criteria
may be used. It is recommended that Bard Return
Air Grille RG5 or Return Filter Grille RFG5 be
installed when no return duct is used. Contact
distributor or factory for ordering information. If
using a return air filter grille, filters must be of
sufficient size to allow a maximum velocity of 400
fpm.
NOTE: If no return air duct is used, applicable
installation codes may limit this cabinet to
installation only in a single story structure.
4. HIGH ALTITUDE APPLICATIONS
Ratings of gas utilization equipment are based on sea
level operation and need not be changed for
operation at elevations up to 2,000 feet. For
operation at elevations above 2,000 feet and in the
absence of specific recommendations from the local
authority having jurisdiction, equipment ratings shall
be reduced as specified in Section 18.
5. TRANSPORTATIONDAMAGE
All units are packed securely in shipping container.
All units should be carefully inspected upon arrival
for damage. In the event of damage, the consignee
should:
1. Note on delivery receipt of any damage to
container.
2. Notify carrier promptly, and request an inspection.
3. In case of concealed damage, the carrier must be
notified as soon as possible within 15 days after
delivery.
4. Claims for any damage, apparent or concealed,
should be filed with the carrier, using the
following supporting documents:
A. Original Bill of Lading, certified copy, or
indemnity bond.
B. Original paid freight bill of indemnity in lieu
thereof.
C. Original invoice or certified copy thereof
showing trade and other discounts or
deductions.
D. Copy of the inspection report issued by
carrier’s representative at the time damage is
reported to carrier.
6. INSTALLATION
Size of unit for proposed installation should be based
on heat loss/heat gain calculations made according to
methods of Air Conditioning Contractors of America
(ACCA). The air duct should be installed in
accordance with the Standards of the National Fire
Protection Association for the Installation of Air
Conditioning and Ventilating Systems of Other Than
Residence Type, NFPA No. 90A, and Residence
Type Warm Air Heating and Air Conditioning
Systems, NFPA No. 90B. Where local regulations
are at a variance with instructions, installer should
adhere to local codes.
WARNING
In all cases, there must be a metal duct
connection made to the supply air flange, and a
one inch clearance to combustibles must be
maintained to this duct connection.
For free blow applications, a metal sleeve
must be used in the wall opening itself, again
maintaining a one inch clearance to
combustibles.
Failure to use the sheet metal can cause fire
resulting in property damage, injury, or death.

Manual 2100-365
Page 7
7. WALL MOUNTING INFORMATION
1. Two holes for the supply and return air
openings must be cut through the wall as
detailed in Figure 4.
2. On wood-frame walls, the wall construction
must be strong and rigid enough to carry the
weight of the unit without transmitting any unit
vibration.
3. Concrete block walls must be thoroughly
inspected to insure that they are capable of
carrying the weight of the installed unit.
8. MOUNTING THE UNIT
1. These units are secured by wall mounting
brackets which secure the unit to the outside
wall surface at both sides. A bottom mounting
bracket is provided for ease of installation but
is not required.
2. The unit itself is suitable for 0 inch clearance,
but the supply air duct flange and the first 3
feet of supply air duct require a minimum of
one inch clearance to combustible material. If
a combustible wall, use a minimum or 12” x
32” dimensions for sizing. See Figures 6 and 7
for details.
3. Locate and mark lag bolt locations and bottom
mounting bracket location.
4. Mount bottom mounting bracket.
5. Hook top rain flashing under back bend of top.
Top rain flashing is shipped secured to the right
side of the back.
6. Position unit in opening and secure with 5/16
lag bolts; use 7/8 inch diameter flat washers on
the lag bolts.
7. Secure rain flashing to wall and caulk across
entire length of top. See Figure 4.
8. On side by side installations, maintain a
minimum of 20 inches clearance on right side
to allow access to control panel and burner
compartment, and to allow proper airflow to the
outdoor coil. Additional clearance may be
required to meet local or national codes.
WARNING
Failure to provide the one inch clearance
between the supply duct and a combustible
surface for the first three feet of duct can result
in fire causing damage, injury or death.
CAUTION
If the bottom bracket is used, be certain the
bracket is secured to the outside wall surface
in a way sufficient to support the entire weight
of the unit during installation until side
mounting brackets are secured.

Manual 2100-365
Page 8
FIGURE 2
VENT TERMINAL AND COMBUSTION AIR INTAKE
MIS-1469
MIS-1449
FIGURE 3
INTERNAL FILTER ACCESS THROUGH UPPER SERVICE DOOR

Manual 2100-365 Page 9
FIGURE 4
MOUNTING INSTRUCTIONS
MIS-1472

Manual 2100-365
Page 10
WARNING
A minimum of one (1) inch clearance must be maintained
between the supply air duct and combustible materials. This is
required for the first three (3) feet of ducting.
It is important to insure that the one (1) inch minimum spacing is
maintained at all points.
Failure to do this could result in overheating the combustible
material and may result in a fire causing damage, injury or death.
FIGURE 5
COMBUSTIBLE CLEARANCE
MIS-1473

Manual 2100-365
Page 11
FIGURE 6
WALL MOUNTING INSTRUCTIONS
FIGURE 7
WALL MOUNTING INSTRUCTIONS
MIS-1475
MIS-1476

Manual 2100-365
Page 12
FIGURE 8
COMMON WALL MOUNTING INSTALLATIONS
MIS-1474

Manual 2100-365
Page 13
12. VENT RESIZING INSTRUCTIONS
When an existing furnace is removed from a venting
system servicing other appliances, the venting system
is likely to be too large to properly vent the
remaining attached appliances.
The following steps shall be followed with each of
the appliances remaining connected to the common
venting system, placed in operation one at a time
while the other appliances remaining connected to
the common venting system are not in operation.
1. Seal any unused openings in the venting system;
2. Inspect the venting system for proper size and
horizontal pitch, as required in the National Fuel
Gas code, ANSI Z223.1 or the CAN/CGA B149
Installation Codes and these instructions.
Determine that there is no blockage or restriction,
leakage, corrosion and other deficiencies which
could cause an unsafe condition;
3. In so far as is practical, close all building doors
and windows and all doors between the space in
which the appliance(s) connected to the venting
system are located and other spaces of the
building. Turn on clothes dryers and any
appliances not connected to the venting system.
Turn on any exhaust fans, such as range hoods and
bathroom exhausts, so they will operate at
maximum speed. Do not operate a summer
exhaust fan. Close fireplace dampers;
4. Follow the lighting instructions. Place the
appliance being inspected in operation. Adjust
thermostat so appliance shall operate continuously;
5. Test for draft hood equipped appliance spillage at
the draft hood relief opening after 5 minutes of
main burner operation. Use the flame of a match
or candle;
6. After it has been determined that each appliance
connected to the venting system properly vents
when tested as outlined above, return doors,
windows, exhaust fans, fireplace dampers and any
other gas-burning appliances to their previous
conditions of use;
7. If improper venting is observed during any of the
above tests, the venting system must be corrected.
9. CLEARANCES
Minimum clearances, as specified in Table 2, must be
maintained from adjacent structures to provide
adequate fire protection, adequate combustion air,
and room for service personnel.
While minimum clearances are acceptable for safety
reasons, they may not allow adequate air circulation
around the unit for proper operation in the cooling
mode. Whenever possible, it is desirable to allow
additional clearance, especially around the condenser
inlet and discharge openings. DO NOT install the
unit in a location that will permit discharged air from
the condenser to recirculate to the condenser inlet.
10. VENT TERMINAL AND COMBUSTION
AIR INLET HOOD
The vent terminal is shipped in the burner
compartment. Remove the two shipping screws and
separate the two-piece assembly. Install the vent
terminal by using the four screws provided. Make
sure gasket is in place. See Figure 2. The
combustion air intake hood is factory installed.
11. OPTIONAL VERTICAL VENTING
With the optional vertical venting kit this unit may be
vented vertically through a roof or overhang. The kit
includes a stainless steel transition drain tee, silicone
sealant, and drain tubing.
TABLE 2
MINIMUM INSTALLATION CLEARANCES
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WARNING
Clearances from combustible materials must
be maintained as specified. Failure to maintain
clearances could cause fire resulting in
property damage, injury, or death.
CAUTION
Vent terminal must be installed as shown in
Figure 2 for proper operation of the heating
system.

Manual 2100-365
Page 14
13. FRESH AIR INTAKE
All units are built with fresh air inlet slots punched in
the service panel.
If the unit is equipped with a fresh air damper
assembly, the assembly is shipped already attached to
the unit. The damper blade is locked in the closed
position. To allow the damper to operate, the
maximum and minimum blade position stops must be
installed. See Figure 9.
All capacity, efficiency and cost of operation
information as required for Department of Energy
“Energyguide” Fact Sheets is based upon the fresh air
blank-off plate in place and is recommended for
maximum energy efficiency.
The blank-off plate is available upon request from the
factory and is installed in place of the fresh air
damper shipped with each unit.
One of several other ventilation options may be
installed. Refer to model number and/or
supplemental installation instructions.
14. CONDENSATE DRAIN
A plastic drain hose extends from the drain pan at the
top of the unit down to the unit base. There are
openings in the unit base for the drain hose to pass
through. In the event the drain hose is connected to a
drain system of some type, it must be an open or
vented type system to assure proper drainage.
15. WIRING – MAIN POWER
FIGURE 9
FRESH AIR DAMPER
BLADE IS
LOCKED CLOSED
FOR SHIPPING
MIS-938
Refer to unit rating plate for wire sizing information
and maximum fuse or “HACR” type circuit breaker
size. Each outdoor unit is marked with a “Minimum
Circuit Ampacity”. This means that the field wiring
used must be sized to carry that amount of current.
All models are suitable only for connection with
copper wire. Each unit and/or wiring diagram will be
marked - “Use Copper Conductors Only”. These
instructions must be adhered to. Refer to the
National Electrical Code (NEC) for complete current
carrying capacity data on the various insulation
grades of wiring material. All wiring must conform
to NEC and all local codes.
The electrical data lists fuse and wire sizes (75° C
copper) for all models.
The unit rating plate lists a “Maximum Time Delay
Relay Fuse” or “HACR” type circuit breaker that is to
be used with the equipment. The correct size must be
used for proper circuit protection and also to assure
that there will be no nuisance tripping due to the
momentary high starting current of the compressor
motor.
The disconnect access door on this unit may be
locked to prevent unauthorized access to the
disconnect. To convert for the locking capability
bend the tab located in the bottom left hand corner of
the disconnect opening under the disconnect access
panel straight out. This tab will now line up with the
slot in the door. When shut a padlock may be placed
through the hole in the tab preventing entry.
See “Start Up” section for important information on
three phase scroll compressor start ups.
WARNING
For your personal safety, turn off electric power
at service entrance panel before making any
electrical connections. Failure to do so could
result in electric shock or fire.
WARNING
Failure to provide an electrical power supply
shut-off means could result in electric shock or
fire.

Manual 2100-365
Page 15
ELECTRICAL GROUNDING
When installed, the furnace must be electrically
grounded in accordance with local codes or in the
absence of local codes, with the National Electrical
Code, ANSI/NFPA 70, or Canadian Electrical Code,
CSA22.1, latest edition. Use a copper wire from
green ground wire on the furnace to a grounded
connection in the service panel or a properly driven
and electrically grounded ground rod. See Table 1
for proper ground wire size.
FIELD INSTALLED EQUIPMENT
Wiring to be done in the field between the furnace
and devices not attached to the furnace, or between
separate devises which are field installed and located,
shall conform with the temperature limitation for
Type T wire {63 degrees F rise (36 degrees C)} when
installed in accordance with the manufacturer’s
instructions.
INSTALLATION OF FLEXIBLE CONDUIT
THROUGH RETURN AIR OPENING
NOTE: To allow proper clearance between the
control panel and any vent options, 90°
conduit fittings must be used on the back of
the control panel.
INSTALLING CONDUIT
1. Remove conduit access panel if required to gain
access to area behind control panel.
2. Remove low voltage and high voltage knockouts
located in rear of control panel.
3. Run low voltage conduit through 7/8 bushing
located in conduit entrance plate and secure to low
voltage opening in rear of control panel.
4. Run high voltage conduit through 1-3/4 bushing
located in conduit entrance plate and secure to high
voltage opening in rear of control panel.
5. Replace conduit access panel if required to
complete installation.
6. Seal around conduit in conduit entrance plate.
FIGURE 10
INSTALLATION OF FLEXIBLE CONDUIT
WARNING
Failure to provide a proper electrical ground
could result in electric shock or fire.
MIS-1553

Manual 2100-365
Page 16
NOTE: The voltage should be measured at the field
power connection point in the unit and while
the unit is operating at full load (maximum
amperage operating condition).
PATEGNAR
042612--352
802781--022
17. THERMOSTATS
TABLE 4
WALL THERMOSTAT AND SUBBASE COMBINATIONS
tatsomrehTesabbuSserutaeFetanimoderP
200-3048 1113F78T 300-4048 0221A935Q ,taehegats1yrucreM;loocegats1 otua-no:naFlooc-ffo-taeh:metsyS
140-3048 9941C4308T --- ,taehegats1yrucreM;loocegats1 otua-no:naFlooc-ffo-taeh:metsyS
530-3048 08-59F1 --- egats2
taeh ,egats2 ooc l
elbammargorP cinortcelE
340-3048 002MC --- ,taehegats1loocegats1 otua-no:naFlooc-ffo-taeh:metsyS
noitcApanS
16. WIRING – LOW VOLTAGE WIRING
230/208 VOLT UNITS
All models are equipped with dual primary voltage
transformers. All equipment leaves the factory wired
on 240V tap. For 208V operation, reconnect from
240V to 208V tap. The acceptable operating voltage
range for the 240V and 208V taps are:
460 VOLT UNITS
All models are equipped with single primary voltage
transformers and no rewiring is required.
TABLE 3
THERMOSTAT WIRE SIZE
remrofsnarT AVALFeguaGeriW
mumixaM ecnatsiD teeFnI
553.2eguag02 eguag81 eguag61 eguag41 eguag21 5406 001 061 052

Manual 2100-365
Page 17
FIGURE 11
LOW VOLTAGE WIRING
MIS-1162