UL BADF090, BADF120 Installation Instruction

INSTALLATION
INSTRUCTION

SINGLE PACKAGE

CONVERTIBLE SERIES

DUAL FUEL HEAT PUMPS

Supersedes: 511.17-N2W (293)

511.17-N2W (398)

MODELS BADF090 & 120

(9.0 EER)

208/230/460 VOLT

MODELS ONLY

SAFETY CONSIDERATIONS

Due to system pressure, moving parts and electrical components,
installation and servicing of air conditioning equipment can be hazardous.
Only qualified, trained, service personnel should install, repair, maintain
or service this equipment.

Observe all precautions in the literature, on labels and tags
accompanying the equipment whenever working on air conditioning
equipment. Be sure to follow all ot her safety precautio ns that apply.

Wear safety glasses and work gloves, and follow all safety
codes. Use a quenching cloth and have a fire extinguisher
available for al l br az in g operations.

GENERAL

Model BDF Dual Fuel Heat Pumps are single package units with gas
heat designed for ou tdoor instal lation on a roofto p or a slab.

The units are completely assembled on rigid, permanently
attached base ra ils. All piping, refr igerant charge , and electrical
wiring is factory installed an d tested. The units requ ire only
electric power an d duct co nnecti ons at the po int of i nstall ation.

The gas-fired heaters have aluminized steel tubular heat
exchangers and spark ignition with proven pilot.

INSPECTION

As soon as a unit is received, it should be inspected for possible
damage during transit. If damage is evident, the extent of the

FOR YOUR SAFETY

If you smell gas:

1. Open windows.

2. Don’t touch electrical switches; do not use
any phones in the area of the gas leak.

3. Extinguish any open flame.

4. Immediately call your gas supplier from another
loc atio n. Follow your gas supplier’s instructions.

5. If you cannot reach your gas supplier, call the fire
department.

Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any
other appliance

FOR YOUR SAFETY

.

035-15683

208/230/575 V OLT

MODELS ONLY

damage should be noted on the car rier’s freig ht bill. A sepa rate
request for inspec tion by the carr ier’s agent sho uld be made in
writing. Refer to Form 50.15-NM for additional information.

REFERENCE

Additional information on the design, installation, operation and
service of this eq uipment is availa ble in the followi ng reference form s:

530.18-N3.2V - Economizer Acce ssory

•

530.18-N3.8V - Motorized Outdoor Air Damp er Ac cy.

•

530.18-N3.9V - Manual Outdoor Air Damper 0-35%

•

530.18-N3.10V - Manual Outdoor Air Damper 0-100%

•

530.18-N8.4V - Gas Piping Accessory

•

530.18-N10.5V - Pr op an e C on vers io n Acc esso ry (U SA)

•

530.18-N10.6V - Hig h Alti tude Access ory (Na t. G as)

•

530.18-N10.7V - Hi gh Al titu de Accesso ry (Prop ane)

•

690.15-N28V - Low Ambien t Accesso ry

•

Renewal Parts:

Refer to t he Renewa l Parts Manu al for comple te listing of

•

replacemen t pa rt s on this equipment.

All forms referenced in this instru ction may be ordered from:

Publications Distribution Center
Unitary Products Grou p
P.O. Box 1592, York, Pa. 17405

APPROVALS

Design certified by U.L. as follows:

1. For use as a heat pump only unit or a heat pump unit with
a forced air furnace.

2. For outdoor installation only.

3. For installation on combustibl e material.

4. For use with na tu ra l ga s or propane gas.

Not suitable for use with conventional venting systems.

LIMITATIONS

CAUTION

THIS PRODUCT MUST BE INST ALLED IN STRICT COMPLIANCE
WITH THE ENCLOSED INSTALLA TION INSTRUCTIONS AND ANY
APPLICABLE LOCAL, STATE, AND NATIONAL CODES
INCLUDING, BUT NOT LIMITED TO, BUILDING, ELECTRICAL,
AND MECHANICAL CODES.

WARNING

INCORRECT INSTALLATION MAY CREATE A CONDITION
WHERE THE OPERATION OF THE PRODUCT COULD CAUSE
PERSONAL INJURY OR PROPERTY DAMAGE

Installer should pay particular attention to the words:
the installation easier. Cautions are given to prevent equipment damage. Warnings are given to alert installer that personal in­jury and/or equipment damage may result if installation procedure is not handled properly.

NOTE, CAUTION

and

WARNING

. Notes are intended to clarify or make

511.17-N2W

TABLE OF CONTENTS

Safety Cons iderations.................. ........................................ 1

General................................................................................1

Inspection.............................................................................1

Reference ............................................................................ 1

Approvals ..... .......................... .............................................. 1

Nomenclature.......................................................................2

INSTALLATION

Limitations............................................................................ 3

Location ...............................................................................3

Condensate Drainage Precaution ....................................... 3

Rigging and Handling .......................................................... 3

Clearances........................................................................... 3

Ductwork .............................................................................. 3

Condensate Drain................................................................ 4

Compressors........................................................................4

Filters ................................................................................... 4

Service Access..................................................................... 4

Thermostat.................. ........ ........ ........ ........ ........ ........ ........ .4

Power and Control Wiring.................................................... 4

Combustion Discharge........... .. .. .. .................. .. .. .................4

Gas Piping .................................. .. .. .................. .. .. .. .............4

Gas Connection.................. .. .. .. .................. .. .. .................. .. .5

L.P. Units, Tanks and Piping ................................................ 6

Ven t and Comb usti on Air Hood s............. .... .... .... .... .... .... .... .6

OPERATION

Cooling System.................................................................. 10

Heating System (Heat Pump)............................................10

Defrost Sequence of Operation ..........................................11

Heating System (Gas Heat)............................................... 12

Safety Controls ...................................... ............................ 12

Heat Anticipator Setpoints ................................................. 12

Pre-Start Check List........................................................... 12

START-UP

Operating Instructions........................................................ 14

Post-Start Check List.........................................................14

Manifold Gas Pre ssur e Adju stm ent.................... .... .... .... ...14

Pilot Checkout.................................................................... 14

Burner Instructions.............................................................14

Burner Air Shutt er Adju stment............ .... ...... ...... ...... ...... ...15

Checking Supply Air CF M............... .... .... .... .... .... .... .... .... ...15

Adjustment of Temperature Rise .................. .. .. .................16

Checking Gas Input ........................................................... 16

Secure Owner’s Approval.................................................. 16

MAINTENANCE & TROUBLESHOOTING

Normal Maintenance....... .. .. .. .................. .. .. .. .................. .. .17

Cleaning Flue Passages and Heating Elements...............17

Troubleshooting ................................................................. 18

Replacement Parts ............................................................ 19

TABLES

No. Description Page

1 Unit Applicatio n Da ta............ .... .... .... .... .... .. 3

2 Gas Heat Application Data.......................... 5

3 Pipe Sizing.................................................. 5

4 Physical Data.............................................. 9

5 Supply Air Blower Performance.................. 9

6 Accessory Static Resistances .................... 10

7 Blower Motor and Drive Data...................... 10

8 Electrical Data............................................. 10

9 Limit Control Setting ................................... 13

10 Blower Motor Pul ley Adju stm ent................ . 15

11 Gas Rate - Cubic Feet Per Hour ................ 16

FIGURES

No. Description Page

1 Center of Gravity......................................... 3

2 Recommended Drain Piping....................... 4

3 Typical Field Wiring..................................... 5

4 External Supply Connection ........ ............... 6

5 Bottom Supply Connection......................... 6

6 Ven t and Comb usti on Air Hood s......... .... .... 6

7 Dimensions and Clearances....................... 7

8 Defrost Initiat io n Times........... .. .. .. .. ............ 12

9 Ambient Modified Time/Temp. Control........ 12

10 Gas Valve Piping......................................... 13

11 Typical Gas Valve ....................................... 14

12 Proper Flame Adjustm ent.................. ...... ... 14

13 Typ ical F lam e Ap pear ance.................... .... . 15

14 Pressure Drop versus Supply Air CFM....... 15

B A D F - F 09 0N

PRODUCT CA TEGORY

B = Single Package Heat Pump

2 Unitary Products Group

(Air-Cooled)

PRODUCT GENERAT ION

A = 1st Generation

PRODUCT IDENTIFIER

DF = Dual Fuel Heat Pump

PRODUCT NOMENCLAT URE

0 50

VOLT AGE CODE

-T = 208/230-3-60

-W = 460-3-60

-X = 575-3-60

NOMINAL COOLING

CAPACITY

090 = 7-1/2 Ton
120 = 10 Ton

NOMINAL HEA T ING

INPUT CAPACITY

GAS

165 = 163 MBH
205 = 204 MBH
245 = 245 MBH

FACTORY

INSTALLED HEAT

N = Natural Gas

INSTALLATION

These units m us t be installed in ac co rd an ce w i th the following
national and lo cal safety codes:

1. National El ec tr ic al C o de AN SI/ NFPA No. 70.

2. National Fuel Gas Code Z223.1.

3. Gas-Fired C en tr al Fu rnace Standard ANSI Z2 1. 47 a.

4. Local gas util ity requirements.

5. Canadian Electrical Code C22.1

6. Canadian Insta ll at io n Cod es CAN1 -B1 49 .
Refer to Table 1 for Unit Application Data and to T able 2 for Gas

Heat Application Data.
If components are to be adde d to a unit to meet local codes ,

they are to be ins talled at the de aler ’s and/or the customer ’s
expense.

Size of unit fo r pr op os ed ins tall at io n sh ou ld be base d on hea t
loss/heat gain calculation made according to the methods of
the Air Conditio ning Contr acto rs of Amer ica ( ACCA).

This furnace is n ot to be used for temporary heating of b uildings
or structures under construction.

LOCATION

TABLE 1

Min. / Max.*

Utilization range “A” in accordance with ARI St anda rd 110.

*

Use the follow ing guidelines to selec t a suitable location for
these units.

1. Unit is designed for outdoor installation only.

2. Outdoor coil mu st ha ve an un li mit ed su pply of air. Elevate

WARNING:Excessive exposure of this furnace to

3. For ground level installation, use a level concrete slab with

4. Roof structure must be able to support the weight of the unit

- UNIT APPLICATION DATA

Model 090 MBH 120 MBH

Voltage

Variation

Wet Bulb Temperature (°F)

of Air on Indoor Coil,

Min. / Max.

Dry Bulb Temperature (°F)

of Air on Outdoor Coil,

Min. / Max.

the unit sufficiently to prevent any blockage of the air
entrances in areas where snow accumulations are
expected.

a minimum thic kness of 4 inches. The length and width
should be at le ast 6 in ches gre ater t han the unit bas e ra ils.
Do not tie slab to the building foundation.

and its accessories. Unit must be installed on a solid level
roof curb or appropriate angle iron frame.

CAUTION: If a unit is to be installed on a roof curb or

208 / 230V 187 / 253

460V 414 / 506
575V 518 / 630

57 / 72 57 / 72

45 / 120 45 / 120

contaminated combustion air may result in
equipment damage or personal injury. Typical
contaminates incl ude: perma nent w ave s olut ions ,
chlorinated waxes and cleaners, chlorine based
swimming pool chemicals, water softening
chemicals, carbon tetrachloride, Halogen type
refrigerants, cleaning solvents (e.g.
perchloroethylene), printing inks, paint removers,
varnishes, hydrochloric acid, cements and glues,
antistatic fabric softeners for clothes dryers,
masonry acid washing materials.

special fra me , gask eting mu st be applied to all
surfaces that come in contact with the unit
underside.

511.17-N2W

OUTDOOR COIL CONDENSATE DRAINAGE
PRECAUTION

Condensate will drain from the outdoor coil during the heating
and defrost c yc le s. Nor mal ly th is co nd en sate may be all ow ed
to drain directly onto the ground/roof. A gravel bed is
recommended to prevent mud splashi ng.

WARNING:The unit should n ot be in stalled i n an are a where

mud or ice could cause personal injury. Remember
that condensate will drip from the outdoor coil
during heat and defrost cycles and that this
condensate will freeze when the temp erature of the

°

outdoor air is below 32

F.

RIGGING AND HANDLING

Exercise care when moving the unit. Do not remove any
packaging unti l the unit is ne ar the place of installa tion. Rig the
unit by attaching chain or cable slings to the lifting holes
provided in the base rails. Spreaders, whose length exceeds
the largest dimension across the unit,

MUST

be used acr oss

the top of the unit.
BEFORE LIFTING A UNIT, MAKE SURE THAT ITS WEIGHT

IS DISTRIBUTED EQUALLY ON THE CABLES SO THAT IT
WILL LIFT EVENLY.

Units may also be moved or lifted with a forklift. Slotted
openings in the base rails are pr ovided for this purpose.

LENGTH OF FORKS MUST BE A MINIMUM OF 54".
Remove the nesting brackets from the four corners on top of

the unit. All screws that are removed when taking these
brackets off must be replaced on the unit.

CAUTION: An adhesive backed label is provided over the

outside of the combustion air inlet opening to
prevent moistur e from entering the unit w hich could
cause damage to electrical components. Allow this
closure label to remain in place until the
combustion air hood is to be installed (refer to
Figure 7).

Refer to Table 4 for unit weights and to Figure 1 for approximate
center of gravity.

CLEARANCES

DIM. 7-1/2 Ton 10 Ton

FIG. 1

- CENTER OF GRAVITY

A 32" 32-1/2"
B 44-3/4" 44"

All units re quire cert ain cleara nces for
proper operation and service. Installer must make provisions
for adequate combustion and ventilation air in accordance with
Section 5.3, Air for Combustion and Ventilation of the National
Fuel Gas Code, A NSI Z2 23.1 (i n U.S.A. ) or Sectio ns 7.2, 7.3
or 7.4 of Gas Installation Codes CAN/CGA-B149.1 and .2 (in
Canada) and/or applicable provisions of the local building
codes. Refer to Figure 10 for the clearances required for
combustible co nstructi on, ser vicing, and proper unit oper ation.

WARNING:Do not permit overhanging st ructures or shrubs to

obstruct outdoor air discharge outlet, combustion
air inlet or vent outlet.

DUCTWORK

Ductwork should be designed and sized ac cording to the metho ds
in Manual Q of th e Air Conditioning Contrac tors of America (ACCA).

5. Maintain level tolerance to 1/2" maximum across the entire
length or width of the unit.

Unitary Products Group 3

A closed return duct system shall be used. This shall not preclude
use of economizers or outdoor fresh air intake. The supply and

511.17-N2W

return air duct connections at the unit should be made with
flexible joints to minimize noise.

CAUTION: Make sure that a ll sc re ws a re replaced on the unit

to maintain an air-tight seal.

The supply and return air duct systems should be designed for the
CFM and static requirements of the job. They should NO T be sized
to match the dimensions of the duct connections on the unit.

CAUTION: When fastenin g ductwork to sid e duct flanges on

Refer to Fig ure 8 for i nformatio n concerni ng side and bo ttom
supply and return air duct openings.

unit, inse rt screws t hrough duc t flanges on ly. DO
NOT insert screws through casing.

Outdoor ductwork must be insulated and
waterproofed.

CONDENSATE DRAIN

Plumbing must conform to local codes. Use a sealing compound
on male pipe threads. Install a condensate drain line from the 3/4"
female connection on the unit to spill into an open drain.

NOTE: The condensate drain line MUST be tr apped to provi de

proper drainage. See Figure 3.

COMPRESSORS

The compressors are mounted on springs which have been
tightened down for shipment only. After the unit is installed, back
out the compressor bolts until the sleeve clears the top grommet.

FILTERS

2" filters are supplied with each unit. 1" replacement filters may be
used with no modification to the filter racks. Filters must always be
installed ahea d of the indoor coil and mu st be kept clean or repl aced
with same size and type. Dirty fi lters w ill redu ce the cap acity o f the
unit and will result in frosted coils or safet y shutdown. Minimum filt er
area and required sizes are shown in Table 4.

SERVICE ACCESS

Access to all serviceable components is provided by the
following removable panels:

•

Compressor compartment

•

Burner compartment (Two panels)

•

Blower compartment

•

Main control bo x

•

Filter compartment

Refer to Figure 8 for location of these access panels.

THERMOSTAT

The room thermostat should be located on an inside wall
approximatel y 5 6" ab ove the flo or wh ere it will not be subj ect
to drafts, sun exposure or heat from electrical fixtures or
appliances. Follow manufacturer’s instructions enclosed with
thermostat for general installation procedure. Color coded
insulated wires (#18 AWG) should be used to connect
thermostat to unit. Eight conductors are required.

POWER AND CONTROL WIRING

Field wiring to the unit must conform to provisions of the
National El ectrical Code , ANSI / NFPA (latest edit ion) and/or
local ordinances. The unit must be electrically grounded in
accordanc e with N.E.C. A NSI / NFPA (latest ed ition) or local
codes. Voltage tole rances which must be ma intained at the
compressor t erminals during s tarting and runnin g conditions
are indicated on the unit Rating Plate and Table 1.

The internal wiring harness furnished with this unit is an integral
part of a UL and C.G.A. design certified unit. Field alteration to
comply with electrical codes should not be required.

A disconnect switch should be field provided for the unit. The switch
must be separate from all other circuits. Refer to Figure 8 for installation
location. If any of the wire supplied with the unit must be replaced,
replacement wire must be of the type shown on the wiring diagram.

Electrical line must be si zed properly to carry the load. USE COPPER
CONDUCTORS ONLY. Each unit must be wired with a separate
branch circuit fed directly from the meter panel and properly fused.

CAUTION: When connecting electrical power and control wir-

ing to the unit, w aterproo f type connecto rs MUST
BE USED so that water or moisture cannot be
drawn into t he unit during nor mal operation. The
above waterproofing conditions will also apply
when installing a field-supplied disconnect switch.

Refer to Figur e 4 fo r ty pi ca l fi el d wir in g an d to the approp ri at e
unit wiring diagram for control circuit and power wiring
information. Refer to Table 8 for electrical data.

COMBUSTION DISCHARGE

The products of combustion are discharged horizontally
through a screened (hooded) opening on the upper gas heat
access pane l.

FIG. 2 -

4 Unitary Products Group

RECOMMENDED DRAIN PIPING

GAS PIPING

Proper sizing of gas p ipin g de pend s on the cub ic fee t pe r ho ur
of gas flow required, specific gravity of the gas and the length
of run. “National Fuel Gas Code” Z223.1 should be followed in
all cases unles s superseded by local codes or gas company
requirements. Re fe r t o Table 3.

The heating value of the gas may differ with locality. The value
should be checke d w it h th e lo ca l gas utility.

511.17-N2W

FIG. 3

- TYPICAL FIELD WIRING

TABLE 2

Capacity,

NOTE: Gas Heaters are shipped available for natural gas, but can be converted to L.P. with
Kit Model No. 1NP042 1 (US A) or 1NP 0 42 7 ( CA N.) . Al l f ur na ces m ee t t he l at est
California seasonal efficiency requirements.

1

Based on 1075 Btu/Ft3.

2

The air flow must be adjusted to obtain a temperature rise within the range shown.

- GAS HEA T APPLICATION DATA

Input

(Mbh)

163 130 7
204 163 7
245 198 10 T on 228 30 60

Output

Capacity,

(Mbh)

Available on

Models

1

⁄

T on 152 30 60

2

1

⁄

& 10 Ton 190 30 60

2

Gas Rate

(Ft.3/Hr.)

1

Temp. Rise °F

At Full Input

Min. Max.

2

NOTE: There may be a local gas utility requirement specifying

a minimum diameter for gas piping. All units require a
1/2 or 3/4 inch pipe connection at the gas valve.

GAS CONNECTION

The gas supply line can be routed through the knockouts
located on the front of the unit or through th e opening pr ovided
in the unit’s base. Refer to Figure 8 to locate these access
openings. Typical supp ly piping arrangements a re shown in
Figures 5 and 6. All pipe nipples, fittings and the gas cock are
field-supplied. A gas piping kit (1GP0402) is available for
bottom supply with external shutoff.

Two grommets are shipped in the blower compartment (in parts
bag taped to the blower housing) of every unit and should be
used in the knockout s when the gas piping pene trates the f ront
of the unit.

After the gas supply piping has been installed, the bottom
opening shou ld be sealed to prevent water f rom leaking into
the building.

Gas piping recommendations:

1. A drip leg and a ground joint union must be installed in the

gas piping.

TABLE 3

Length in Feet

Maximum capacity of pipe in cubic feet of gas per hour. (Based upon a pressure drop of 0.3
inch water column and 0.6 spe ci fic gr avit y gas) .

- PIPE SIZING CHART

1/2 in. 3/4 in. 1 in. 1-1/4 in.

10
20
30
40
50
60
70
80
90

100

132

92
73
63
56
50
46
43
40
38

Nominal Iron Pipe Size

278
190
152
130
115
105

96
90
84
79

520
350
285
245
215
195
180
170
160
150

1,050

730
590
500
440
400
370
350
320
305

2. When required by local codes, a manual shut-off valve may
have to be installed outside of the unit.

3. Use wrought iron or steel pipe for all gas lines. Pipe compound
should be applied sparingly to male threads only .

WARNING:Natural gas may cont ain some propane. Propane,

being an excellent solvent, will quickly dissolve
white lead or most standard commercial com­pounds. Therefore, a special pipe compound must
be applied when wrought iron or steel pipe is used.
Shellac base compounds such as Gaskolac or
Stalastic, and compounds such as Rectorse al #5,
Cyde’s or John Crane may be used.

4. All piping should be cl eaned of dir t and scale by hammeri ng
on the outside of the pipe and blowing out the loose dirt and
scale. Before initial start-up, be sure that all of the gas lines
external to the unit have been purged of air.

5. The gas supply should be a separate line and installed in
accordance with all safety codes as prescribed under
“Limitations”. After the gas connections have been
completed, o pen the main shut -off val ve ad mitting

gas pressu re

to the mains. Che ck all joint s for leaks wit h

normal

Unitary Products Group 5

511.17-N2W

FIG. 4

- EXTERNAL SUPPLY CONNECTION
EXTERNAL SHUT-OFF

FIG. 5

- BOTTOM SUPPLY CONNECTION
EXTERNAL SHUT-OFF

soap solution or other material suitable for the purpose .
NEVER USE A FLAME.

6. The furnace and its individual manual shut-off valve must
be disconnected from the gas supply piping system during
any pressure testing of that system at test pressures in
excess of 1/2 psig (3. 48kPa).

The furnace mu st be isolated from the gas supply piping
system by closing its individual manual shut-off valve during
any pressure t esting of th e gas supply piping syst em at te st
pressures equa l to or le ss tha n 1/ 2 ps ig (3.48kPa).

7. A 1/8 inch NPT plugged tapp ing, acces sible fo r test gage
connection, must be installed immediately upstream of the
gas supply connection to the furnace.

L.P. UNITS, TANKS AND PIPING

All gas heat units are shipped from the factory equipped for
natural gas use only. The unit may be converted in the field for
use with L.P. gas with accessory ki t m o de l n um b er 1NP0437 .

All L. P. gas equipmen t must confor m to the safe ty standa rds
of the Nationa l Fi re Protection Associatio n.

For satisfactory operation, L.P . gas pressure must be 10.5 inch
W.C at the unit under full load. Maintaining proper gas pressure
depends on three ma in f ac to rs :

Check all connections for leaks when piping is completed,
using a soap soluti on . NEVER USE A FLAME.

VENT AND COMBUSTION AIR HOODS

The vent and comb ustion air h oods (wi th screen s) are shi pped
attached to the blower housing in the blower compartment.
These hoods mu st be in st al le d to a ssure proper unit func ti on .
Both hoods must be fastened to the outs ide of the gas heat
access panel wi th the screws pr ovided in the b ag also atta ched
to the blower housing.

The screen for the comb ustion air intake ho od is secu red to the
inside of the a ccess panel open ing with thre e fasteners an d the
screws used for mo unting the hood t o the panel. The top flange
of this hood s li ps i n under the top of the access pane l o pe ning
when installing. Refer to Figure 7.

The vent hood is installed by inserting the top flange of the hood
into the slotted opening in the access panel, positioning the
vent screen between the hood flanges and the access panel,
and securing in pl ac e.

1. The vaporization rate which depends on (a) the
temperature of t he liquid and (b) the “wetted surface” area
of the container or containers.

2. The proper pres sure regulation. (Two-stage regu lation is
recommended from the standpoint of both cost and
efficiency.)

3. The pressure drop in the lines between regulators and
between the second stage regulator and the appliance.
Pipe size requi red wi ll depe nd on th e lengt h of th e pipe run
and the total load of all appliances.

Complete infor mation regarding tank sizi ng for vaporization,
recommended reg ulator se ttings, a nd pipe si zing is av ailable
from most regulator manufacturers and L.P. gas supplier s.

L.P. gas is an excellent solvent and special pipe compound
must be used when assembling piping for this gas as it will
quickly dissolve white lead or most standard commercial
compounds. She ll ac base co mpo unds s uch as Re ctor se al #5
are satisfactory for this type of gas.

6 Unitary Products Group

FIG. 6

- VENT AND COMBUSTION AIR HOODS

VENT AIR

FIELD-SUPPLIED
DISCONNECT SWITCH
LOCATION

(A)
CONTROL WIRING
ENTRY

BLOWER
ACCESS

OUTLET HOOD

COMPRESSOR
ACCESS
(See Detail "X")

511.17-N2W

33-7/8"

39-7/8"

47-7/8"

DOT PLUG FOR PRESSURE CHECK

FILTER ACCESS

3/4" PVC FEMALE
COND. DRAIN CONN.
(See Detail "Y" for location)

GAS/ELEC

UNITS

(090)

(120)

(150)

(B)
POWER WIRING
ENTRY

5-1/4"

UNIT BASE WITH RAILS
Shown separately to illustrate
bottom duct openings, power and
gas piping connectionlocations

(A)
CONTROL WIRING
ENTRY

(B)
POWER WIRING
ENTRY

9-5/8"

71"

BOTTOM SUPPLY
AND RETURN AIR
OPENINGS
(SEE NOTE)

24"

26-3/4"

7-1/4"

1-1/4"

52-1/2"

22"

9-3/4"

13-1/8"

7-3/4"

100-3/4"

6-3/8"

7-1/4"

7-1/4"

(C)
GAS SUPPLY
ENTRY

CONTROL BOX
ACCESS

17"

2"

(D)
GAS SUPPLY
ENTRY

52-1/2"

NOTE:
For curb mounted units,refer to the duct
hanger dimensions of the curb for the
proper size of the supply and return air
duct connections

GAS HEAT
ACCESS

CONDENSER
COIL

DOT PLUG FOR PRESSURE
CHECK

COMBUSTION
AIR
INLET HOOD

3-3/4"

FRONT
VIEW

RETURN AIR

SUPPLY AIR

OUTDOOR AIR
OUTDOOR AIR

(Economizer)

26-3/4"

7-1/4"

1-1/4"

52-1/2"

BLOWER
ACCESS

22"

9-3/4"

13-1/8"

7-3/4"

6-3/8"

7-1/4"

100-3/4"

CONTROL BOX
ACCESS

17"

2"

52-1/2"

FIELD-SUPPLIED
DISCONNECT SWITCH
LOCATION

33-7/8"

(090)

39-7/8"

(120)

47-7/8"

(150)

FILTER ACCESS

3/4" PVC FEMALE
COND. DRAIN CONN.
(See Detail "Y" for location)

(B)
POWER WIRING
ENTRY

GAS/ELEC

UNITS

UNIT BASE WITH RAILS
Shown separately to illustrate
bottom duct openings, power and
gas piping connectionlocations

DETAIL "X"

FIG. 7

- DIMENSIONS & CLEARANCES - 7-1/2 & 10 TON

(A)
CONTROL WIRING
ENTRY

9-5/8"

71"

BOTTOM SUPPLY
AND RETURN AIR
OPENINGS
(SEE NOTE)

5-1/4"

24"

(A)
CONTROL WIRING
ENTRY

(B)
POWER WIRING
ENTRY

(SIDE SUPPLY AND RET URN AI R DUCT O PENING S)

VENT AIR
OUTLET HOOD

7-1/4"

(C)
GAS SUPPLY
ENTRY

NOTE:
For curb mounted units,refer to the duct
hanger dimensions of the curb for the
proper size of the supply and return air
duct connections

COMPRESSOR
ACCESS
(See Detail "X")

GAS HEAT
ACCESS

(D)
GAS SUPPLY
ENTRY

CONDENSER
COIL

COMBUSTION
AIR
INLET HOOD

3-3/4"

FRONT
VIEW

DUCT COVERS - Units are shipped with
all air duct openings covered.
For

side duct applications;

1. Remove and discard the supply and return
air duct covers.

2. Connect ductwork to duct flanges on the rear
of the unit.
For

bottom duct applications;

1. Remove the side supply and return air duct
covers to gain access to the bottom supply
and return air duct covers.

2. Remove and discard the bottom duct covers.

3. Replace the side duct covers.

UTILITIES ENTRY DATA

HOLE

A

B2" KO
C 2" KO Gas Piping (Front)

D 1-11/16" KO Gas Piping (Bottom)*

Openings in the bott om of th e un i t can be loca te d by th e slic e in th e

*

insulation.

All dimensions are in inches. They are subject to change
without notice. Certified dimensions will be provided upon
request.

OPENING

SIZE

USED FOR

(DIA.)
3/4" KO
7/8" KO Bottom*

Control
Wiring

Side

Power Wiring
(Side or Bottom)*

Unitary Products Group 7

511.17-N2W

BAROM ETRIC RELIEF RAIN HOOD

E C O N O M IZ E R R A IN H O O D

(B) POW ER W IRING

3/4" CONDENSATE
DRAIN

27"

23-3/8" 2"

REAR VIEW L.H. END VIEW

DETAIL "Y"

3-3/4"

DIM
"A "

28

ECONOMIZER

31

MO TORIZED DAMPER

31

M ANUAL DAMPER 0-100%

24

M ANUAL DAMPER 0-35%

(UNIT WITH ECONOMIZER RAIN HOOD)

A

(M UST BE TRAPPED )

E N T R Y

71"

29-5/8"

7"

3-1/2"

4-1/2"

CLEARANCES

Front 24"
Back

Left Side (Filter Access)
Right Side (Cond. Coil) 24"

Below Unit
Above Unit

1

2

CORNER WEIGHTS

A

12" (Less Economizer)
36" (With Economizer/
Fresh Air Damper)

24" (Less Economizer)
54" (With Economizer)

20"

72" with 36" maximum
Horizontal Overhang
(For Outdoor Air Discharge)

B

FRO N T

1

Locate unit so that the vent air outlet hood is at least:

•

Three (3) feet above any forced air inlet located within 10

horizontal feet (excluding those integral to the unit).

•

Four (4) feet be low, 4 horizonta l feet f rom, o r 1 foot above a ny

door or gravity air inlet into the building.

•

Four (4) feet from electric meters, gas meters, regulators and

relief equipment.

2

Units may be installed on combustible floors made from wood

or class A, B or ro of c ov er in g m at erial.

3

Units must b e installe d outdoors . Overhanging s tructures o r
shrubs should not obstruct outdoor air discharge outlet.
NOTE: A 1" clearance must be provided between any
combustible material and the supply air ductwork for a distance
of 3 feet from the unit.
The products of combustion must not be allowed to
accumulate within a confined space and recirculate.

F

C

A

E

D

FRO N T

C

4 POINT LOADS

D

BDF

UNIT

TOTAL A B C D
090 1,237 247 310 378 302
120 1,612 322 416 492 382

BDF

UNIT

TOTAL A B C D E F
090 1,237 155 186 217 264 226 189
120 1,612 199 246 293 347 291 236

NOTE: These weights are with economizer and 24kW electric heat.

8 Unitary Products Group

4 - POINT LOADS (LBS)

6 - POINT LOADS (LBS)

B

6 POINT LOADS

TABLE 4

- PHYSICAL DATA

MODEL

SUPPL Y AI R

BLOWER

INDOOR

COIL

OUTDOOR

FAN

(Two Per Unit)

OUTDOOR

COIL

AIR

FIL T ER S

(SEE NOTE)

CHARGE

NOTE: Filter racks are adapted for 1" or 2" thick filters.

CENTRIFUGAL BLOWER (Dia. x Wd. in.) 12 x 12 15 X 12
FAN MOTOR HP (STANDARD) 2 3
ROWS DEEP 3 3
FINS PER INCH 15 13
FACE AREA (Sq. Ft.) 7.8 13.4
PROPELLER DIA. (in.) 24 ea. 24 ea.
FAN MOTOR HP 1/2 ea. 3/4 ea.
NOM. CFM TOTAL 2900 ea. 4400 ea.
ROWS DEEP 2 2
FINS PER INCH 13 15
FACE AREA (Sq. Ft.) 20.0 29.3
QUANTITY PER UNIT (12" X 24" X 2") 2 ­QUANTITY PER UNIT (16" X 24" X 2") 2 3
QUANTITY PER UNIT (18" X 24" X 2") - 2
TOT AL FACE AREA (sq. ft.) 9.3 14.0
REFRIGERANT 22

(lbs./oz.)

BDF

090 120

SYSTEM NO. 1 9/0 11/8
SYSTEM NO. 2 9/0 13/8

511.17-N2W

WEIGHTS (LBS)

130 Mbh 1 140
165 Mbh 1 160
165 Mbh 1515

10

200 Mbh 1535

BASIC
UNIT

7-1/2

Ton

Ton

ACCESSORIES
Economizer 77
Motorized Outdoor Air Damper 97
Roof Mounting Curb 155

TABLE 5

MODEL BDF090

- SUPPLY AIR BLOWER PERFORMANCE

- (SIDE DUCT APPLICATIONS)

BLOWER

SPEED,

RPM

2250 2550 3000 3400 3750

ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW

(7-1/2 & 10 TON)

CFM

975 0.83 1.16 1.08 0.66 1.27 1.18 0.37 1.45 1.35 0.08 1.65 1.54 - - ­1025 0.98 1.21 1.13 0.82 1.34 1.25 0.52 1.54 1.44 0.21 1.75 1.63 - - ­1070 1.12 1.32 1.23 0.95 1.46 1.36 0.67 1.68 1.57 0.37 1.89 1.76 0.07 2.11 1.97
1130 1.31 1.43 1.33 1.16 1.57 1.46 0.86 1.83 1.71 0.56 2.04 1.90 - - ­1175 1.51 1.51 1.41 1.36 1.67 1.56 1.07 1.92 1.79 0.75 2.18 2.03 - - ­1220 1.68 1.66 1.55 1.53 1.81 1.69 1.23 2.10 1.96 - - - - - -

MODEL BDF090

BLOWER

SPEED,

RPM

- (BOTTOM DUCT APPLICA TIONS)
CFM

2250 2550 3000 3400 3750

ESP BH P KW ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW

975 0.761.161.080.571.271.180.241.451.35-----­1025 0.91 1.21 1.13 0.73 1.34 1.25 0.39 1.54 1.44 0.04 1.75 1.63 - - ­1070 1.05 1.32 1.23 0.86 1.46 1.36 0.54 1.68 1.57 0.20 1.89 1.76 - - ­1 130 1.24 1.43 1.33 1.07 1.57 1.46 0.73 1.83 1.71 0.39 2.04 1.90 - - ­1 175 1.44 1.51 1.41 1.27 1.67 1.56 0.94 1.92 1.79 0.58 2.18 2.03 - - ­1220 1.61 1.66 1.55 1.44 1.81 1.69 1.10 2.10 1.96 ------

MODEL BDF120

BLOWER

SPEED,

RPM

- (SIDE DUCT APPLICATIONS)
CFM

3000 3500 4000 4500 5000

ESP BHP KW ESP BH P KW ESP BHP KW ESP BHP KW ESP BHP KW
860 1.05 1.40 1.31 0.85 1.58 1.48 0.62 1.80 1.68 0.32 2.05 1.91 - - ­915 1.23 1.55 1.45 1.05 1.76 1.64 0.80 1.98 1.85 0.51 2.23 2.08 0.22 2.48 2.31
950 1.42 1.68 1.57 1.24 1.91 1.78 1.00 2.14 2.00 0.70 2.43 2.27 0.40 2.72 2.54

1000 1.60 1.83 1.71 1.44 2.07 1.93 1.20 2.33 2.17 0.93 2.62 2.45 0.65 2.91 2.72
1050 1.80 1.98 1.84 1.65 2.25 2.10 1.42 2.55 2.37 1.14 2.86 2.67 0.85 3.17 2.96
1090 1.99 2.12 1.97 1.84 2.41 2.24 1.63 2.72 2.54 1.34 3.06 2.86 - - -

MODEL BDF120

BLOWER

SPEED,

RPM

- (BOTTOM DUCT APPLICAT IONS)
CFM

3000 3500 4000 4500 5000

ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW ESP BHP KW
860 0.92 1.40 1.31 0.67 1.58 1.48 0.39 1.80 1.68 0.02 2.05 1.91 - - ­915 1.10 1.55 1.45 0.87 1.76 1.64 0.57 1.98 1.85 0.21 2.23 2.08 - - ­950 1.29 1.68 1.57 1.06 1.91 1.78 0.77 2.14 2.00 0.40 2.43 2.27 0.04 2.72 2.54

1000 1.47 1.83 1.71 1.26 2.07 1.93 0.97 2.33 2.17 0.63 2.62 2.45 0.29 2.91 2.72
1050 1.67 1.98 1.84 1.47 2.25 2.10 1.19 2.55 2.37 0.84 2.86 2.67 0.49 3.17 2.96
1090 1.86 2.12 1.97 1.66 2.41 2.24 1.40 2.72 2.54 1.04 3.06 2.86 - - -

NOTES: Blower performance in cludes a wet indoor coil, 2" filters and the maximum number of heat ex changers.

Refer to Table 6 for the resistance of the unit accessories.
ESP = External St at ic Pr essu re availa bl e for the suppl y and re tu rn air du ct syt em . Al l in te rn al un it re sista nce s have bee n de ducted from the total stati c pr essu re of th e blo wer.

Unitary Products Group 9

511.17-N2W

TABLE 6

- ACCESSORY STATIC RESISTANCES*

EXTERNAL STATIC PRESSURE DROP -

DESCRIPTION

RESISTANCE, IWG

CFM

2250 3000 4000 5000

Economizer 0.02 0.02 0.03 0.05

*Deduct these resistance values from the available external static pressure shown in the respective Blower Performance Table.

TABLE 7

MODELS

- BLOWER MOTOR AND DRIVE DAT A

BLOWER

RANGE

(RPM)

HP

SERVICE

FACTOR

MOTOR*

FRAME

SIZE

EFFICIENCY

(%)

ADJUSTABLE

MOTOR PULLEY

PITCH

DIA.
(IN.)

BORE

(IN.)

FIXED

BLOWER PUL L EY

PITCH

DIA.
(IN.)

BORE

(IN.)

PITCH

LENGTH

(IN.)

BELTS

DESIG-

NAT ION

BDF090 975-1220 2 1.20 56 82.0 3.4 - 4.4 7/8 6.2 1 50.3 A49 1

BDF120 860-1090 3 1.20 56 82.0 3.4 - 4.4 7/8 7.0 1 57.3 A56 1

* All motors are 1750 RPM , ha ve solid base s and ar e inherently protected. T he se m ot or s can be s ele cte d to ope ra te into the ir ser vic e fa cto r be cau se th ey ar e loca te d in th e mo vi ng air,
upstream of any heating device.

QTY

TABLE 8

NOTES: 1. Dual numbers shown as “17.3/16 .7 " am ps ind icat es com pr esso r #1 / #2 re spe ctive ly.

Motor voltage (460-1-60). Unit includes 575/460V transformer.

*

- ELECTRICAL DATA

COMPRESSOR

MODEL

POWER
SUPPLY

208/230-3-60

BDF090

460-3-60
575-3-60

208/230-3-60

BDF120

460-3-60
575-3-60

2. Dual elemen t, time delay ty pe.

3. Dual wire sizes are based on conductors at 60°C/75°C respectively,

(#1 and #2)

RLA

EACH

14.1

7.1

5.8

17.3/16.7

9.6

8.3

1

LRA

EACH

130

64
52

150

73
59

OUTDOOR

FAN
MOTOR,
(#1 & #2)

FLA

EACH

2.3

1.3

1.3*

3.5

2.5

2.5*

SUPPLY

AIR

BLOWER

MOTOR,

FLA

2HP 3HP 2HP 3HP 2HP 3HP

7.5

3.4

2.7

10.6

-

4.8

-

3.9

-

-

-

-

TOTAL

UNIT

AMPACITY,

AMPS

43.8

22.0

18.4

55.9

-

31.4

-

27.6

-

2

MAX.

HACR

BREAKER

SIZE,

AMPS

50
25

-

70
40

-

MAX.
FUSE
SIZE

AMPS

-

-

-

50
25
20

70
40
35

SIZE,

6/8
10/10
12/12

-

-

-

MIN.

WIRE

AWG

3

-

-

-

4/6
8/8

10/8

10 Unitary Products Group

OPERATION

COOLING SYSTEM

The cooling section is a complete factory package utilizing an
air-cooled condenser. The system is factory-charged with
Refrigerant-22. The compressors are hermetically sealed and
internally sprung.

The compresso rs also have inherent (internal) prote ction. If
there is an abnormal temperature rise in a compressor, the
protector will op en to sh ut down the compressor.

511.17-N2W

HEATING MODE - AMBIENT TEMPERATURE ABOVE
BALANCE POINT: The unit will operate in the mechanical
heating mode wi th both compressors en ergized through the
heat relay fo r st ag e 1 he atin g ( W1 ). Terminal W2 will have n o
affect on the unit in this situation. The indoor blower motor will
be energized by the blower interlock relay K5 on the relay
board. Gas heat will no t be en ergi zed unl ess the re is a locko ut
condition or until the ambient temperature falls below the
balance point setting. One stage of mechanical heating is
provided.

PRELIMINARY OPERATION COOLING: Af te r i nsta llation h as
been completed, energize the crankcase heaters for at least
four hours be fo re op erat in g u ni t. Afte r th is i ni ti al warm- up , th e
compressors shou ld be gi ven thr ee fa lse st arts (ener gize d just
long enough to make a few revolutions) with 5-7 minutes delay
between each start before being put into full time service.

NOTE: Prior to each co oling season, th e crankcase heat ers

must be energi zed a t l ea st 10 ho urs be fo re sys te m is
put into operation.

COOLING SEQUENCE OF OPERATION:When the
thermostat calls for “first-stage” cooling, the low voltage control
circuit from “R” to “G” and “Y1" (wiring schematic) is completed
to energize c ompress or #1, out door fa n motor #1 and bl ower
motor simultaneously.

When the thermostat calls for “2nd-stage” cooling, the low
voltage contr ol circui t from “R ” to “ Y2" is co mpleted to ener gize
compressor #2 and outdoor fan motor #2.

After the thermostat is satisfied and opens, all components
likewise stop sim u lt aneously.

The reversing valve is energized thru the "Y1" circuit when the
subbase is in the cooling mode.

The suction line freezestat will cut the compressor out when
the suction line temperature drops below 26°F. T hi s i s a n
automatic reset de vice.

GENERAL: With the proper thermostat, continuous blower
operation is possible by closing the R to G circuit. This, of
course, alters the sequences for this component operation.

HEATING MODE - DEFROST: When t he unit is op erating in
the mechanical heating mode and one compressor goes into a
defrost cycle, the gas heat will not be energized. The gas heat
will be en ergized only wh en both systems are in the defrost
mode simultaneously. When one of the defrost cycles
terminates, the gas heat will be shut off.

HEATING MODE - AMBIENT TEMPERATURE BELOW
BALANCE POINT: When the ambient temperature drops
below the bala nce point setting, the controls will disabl e the
mechanical he at and enable t he gas heat. The g as heat will
cycle on first stage (W1) demand with second stage gas heat
available through terminal (W2). After a time delay, the indoor
blower motor will be energized through the blower interlock
relay K5 on the relay board. Two stages of gas heat are
available.

HEATING MODE - EMERGENCY HEAT AT THE ROOM
THERMOSTAT: If the indoor thermostat is set to Emergency
Heat, the unit controls will disable the mechanical heat and
energize the ga s heat anytime there is a call fo r first stage
heating (W1) in depe nd ent o f the amb ient tem pera tur e an d the
balance point. This Emergency Heat mode is enabled by
energizing terminal E. Second stage gas heat will be energized
by terminal W2.

COMPRESSOR LOCKOUT: Anytime a safety switch opens,
the controls will send a signal through the X terminal on TB1 to
the indoor the rmostat to indi cate a problem. Only the locked-o ut
compressor will be disabled in cooling, but both compressors
will be disa bled in heating. The gas heat will not be energized
by first stage heat (W1) independent of the ambient
temperature and the b alanc e poin t. Lo ckou t must be reset by
interrupting power at the disconnect switch.

HEATING SYSTEM

COOLING MODE: Normal heat pump cooling operation. The
reversing valves, compressors, and outdoor fan motors are
energized thr ough th e Y1 and Y2 termi nals. The in door b lower
motor is energized by terminal G. Two stages of mechanical
cooling are pr ov id ed .

Unitary Products Group 11

(HEAT PUMP)

GENERAL: Durin g the instal lation proce ss, the inst aller must
set the balance point thermostat which is located behind the
blower access panel in the blower compartment . The balance
point thermostat should be set 5 degrees higher than the
calculated ba lanc e po int . W hen t he un it leav es t he f ac tory, the
balance point thermostat will be set to 50°F (the highest
setting).

511.17-N2W

DEFROST SEQUENCE OF OPERATION

These heat pumps have a unique “ambient modified”
time-temperature defrost control that automatically adjusts to
changes in the outdoor temperature. The defrost control will
shorten the defrost initiation time periods above 35°F and will
extend the defrost initiation time periods below 35°F. Th e
control is factory set to defrost at 110 minutes (T3), but it can
be field adju sted to defros t at 80 minute s (T2) or 50 minutes
(T1) in areas wit h hi gh humidity.

The curve in Figure 9 shows how defrost initiation times are
automatically compensated for changes in outdoor temperature.

EXAMPLE: If the timer i s factor y set o n pin T-3 (110 minu tes
35°F outdoor) and the outdoor temperature climbs to 45°, the
time initiation cycle will decrease to every 100 minutes.

If the outdo or temper ature dr ops to 1 0°F where ice is less li kely
to form, the 110 minute interval will extend to every 150
minutes.

Two requirements must be met before a de frost cy cle can be
initiated.

1. The defrost time cycle must be complete.

2.

The liquid line temperature must be less than 28°F.

Defrost will ter minat e when the li quid line sensor reaches
or after 10 minutes.

The defrost time cycle will restart 10 minutes after the start of
the defrost cycle even though the liquid sensor terminated
defrost after 3 min ut es .

During trou bleshooting, the defrost time can be reduce d to 20
seconds by shorting out the SW1 test pegs on the module. The
pegs are 1/2" long, 3/16" apart and are mounted on a white
base. See Figure 10.

at

55°F

LOCKOUT CONTROL: Any one of four conditions will put the
system into a l ock-ou t condit ion duri ng the heati ng or cool ing
mode:

1.

The discharge line temperature reaches 255°F (215°F
reset) or,

2. The discharge pressure reaches 398 PSIG (310 PSIG
reset) or,

3.

The suction line fr e ez es ta t eq uals 26°F (38°F reset) or,

4. The low-pressure cut-out equals 7 PSIG (22 PSIG reset).

A lock-out will energize the emergency heat light on the
thermostat and t he re d LED light o n the unit relay boa rd. Th e
lockout circuit can only be reset by opening the main power
disconnect swi tch. T urning t he thermos tat switch to “OFF ” then
back to “ON”s

will not reset the sy st em .

NOTICE TO OWNER:
If a lockout oc curs, check for the followi ng problems before

calling a servic em a n :

1. Dirty filters.

2. Snow accumulat ion.

3. Leaf or debris blockage.

After eliminat ing the problem, attem pt to restart the syst e m as
follows:

turn the system switch on the thermostat to its “OFF” position

•

for 10 seconds.
turn it back to its original position.

•

If the unit doesn’t start, call a serviceman.
NOTE: Models with an anti-recycle accessory will have a

5-minute dela y be fore starting.

FIG. 8 -

FIG. 9

12 Unitary Products Group

DEFROST INITIATION TIMES

T3 - 110 MINUTE SETTING
(Factory Set Point)

SHORTING PEGS TO
OVERRIDE TIMER
FOR SERVICE

MOVABLE JUMPER
WIRE TO CHANGE
DEFROST TIMER

- AMBIENT MODIFIED TIME/TEMPERAT URE CONTROL

T2 - 80 MINUTE SETTING

T1 - 50 MINUTE SETTING

HEATING SYSTEM

(GAS HEAT)

The following seq uence describes the op eration of the gas heat
section.

CONTINUOUS BLOWER: With the room thermostat switch set
to “ON”, the supply air blower will operate continuously. The
normally clos ed contact “ K5-1" provid es 24 volt power to the
"M3" relay. The “M3-1” and "M3-2" pow er contacts cl ose and
the blower motor operates.

INTERMITTENT BLOWER: With the room thermostat system
switch set to the “AUTO” or “HEAT” position and the fan switch
set to “AUTO”, the supply ai r blower will op erate afte r the room
thermostat calls for heat and the time de lay relay closes.

The “TH1" cl oses, t he draf t motor c ontrol ”DMC" or "ETD"" is
energized. Th e powe r conta ct clos es which energi zes the line
voltage draf t motor. As the speed of th e draft motor reac hes
approximately 2500 RPM, the centrifugal switch contact
located on the end of the draft motor shaft closes to power the
ignition control “IC”.

After 15 seconds, the "I C" will star t the igni tor sparki ng and will
open the re dundant valve lo cated inside the main gas valve
“GV” to allow a flow of gas to only the carryover tube. See Figure
1 1. Only after the pilot flame has been ignited and the presence
of pilot flame de tected at the “IC” by a signa l sent bac k through
the flame sensor is sparking terminated and the main gas valve
opened.

Gas flows into each of the main burners and is ignited from the
carryover tube flame.

If “IC” fails t o detect a pilot f lame, it will co ntinue to try for a
maximum of 85 seconds to ignite the pilot tube. If the pilot flame
is not detected, then "IC" will soft lock out for 5 minutes. If the
pilot flame is not dete cted aft er 16 retr ies , th en " IC" w ill har d
lock out the first stage furnace operation until 24V power is
removed from the modul e ei th er at the un it or by reset ti ng the
room thermosta t.

At the same time power was supplied to the “DMC”, a parallel
circuit activates "BT" which closes "BT-1" after approximately
35 seconds and energizes "K5" which closes "K5-2" and starts
the blower by energizing "M3".

When "TH2" closes calling for second stage heating, it
energizes "W2" on th e gas valve "GV" directly.

When the heating cycle is complete, “TH-1" opens
de-energizing the ”DMR" an d “IC”, thus closing the redu ndant
and main gas valves. The blower motor continues to run
(approximately 15 seconds after the furnace is shut down) until
“TDR” opens de-e ne rg iz in g th e “K5 " an d ”M 3 " re la ys .

REDUNDANT
VALVE

GAS MAIN

MAIN VALVE

511.17-N2W

SAFETY CONTROLS

The control circuit includes the following safety controls:

1. Limit Control (LS). Th is control is locate d inside the heat
exchanger compartment and is set to open at the
temperature in dicated in Table 9. It reset s automatically.
The limit switch operates when a high temperature
condition, caused by inadequate supply air flow occurs,
thus shutting down the igni tion cont rol and closi ng the ma in
gas valve and energizing the blower.

2. Centrifugal Swi tch (CS). If the draft moto r should fail , the
centrifugal switch attached to the shaft of the motor
prevents the ignition control and gas valve from being
energized.

3. Redundant Gas Valve. This valve is an integral part of the
main gas valve and is loc ated up st ream of the mai n gas
valve. Should the main gas valve fail in the open position
the redundant va lv e se rv es as a ba ck up an d sh uts off the
flow of gas.

4. Flame Sensor Rod. This sensor rod is located on the far
side of the carryover tube. If the ignition control does not
receive a sig nal from the flame sensor indicati ng that the
pilot flame has ignited properly, the main gas valve will not
open. If the flame sensor fails to detect the pilot flame during
operation of t he main bur ners, a signal is sent to the ignition
control to close the main gas valve.

5. Rollout Switch. This switch is located in the burner
vestibule. In the event of a sustained main burner flame
rollout, it shuts off the ignition control and closes the main
gas valve.

6. This control is located inside the heat exchanger
compartment and is set to open at 180° F. It is a manual
reset switch. If Aux limit trips, then the primary limit has not
functioned correctly. Replace the primary limit.

TABLE 9

- LIMIT CONTROL SETTING

Units

(Tons)

7-1/2
7-1/2

10
10

Capacity, MBH

Input Output

163
204
204
245

130
163
163
198

Limit Control

Opens, °F

180
170
170
170

HEA T ANT ICIPATOR SETPOINT S

It is importa nt that the anticipator setpoint be correc t. Too high
of a setting will result in longer heat cycles and a greater
temperature swing in the conditioned space. Reducing the
value belo w the correc t setpoint will give sh orter “ON” cycles
and may resu lt in the lowering of the temperature wi thin the
conditioned space.

Gas Valve

Honeywell

VR8520

White-Rodgers

36C76

Anticipator Setpoint

1st Stage 2nd Stage

0.50 amp 0.24 amp

0.60 amp 0.10 amp

GAS
VALVE

FIG. 10

- GAS VALVE PIPING

Unitary Products Group 13

TO PILOT BURNER

TO PILOT BURNER

TO MAIN
BURNER

PRE-START CHECK LIST

Complete the following checks before starti ng the unit.

1. Check the type of gas being supplied. Be sure that it is the
same as listed on the unit nameplate.

2. Make sure that the vent and combustion air hoods have
been properly installed.

511.17-N2W

START-UP

OPERATING INSTRUCTIONS

CAUTION: This furnace is equi pped wit h an int ermittent pilot

and automatic re-ignition system. DO NOT attempt
to manually light the pilot.

1. Remove the cap o n the regulato r. It’s located next to the
push-on electrical terminals.

2. To decrease the gas pressure, turn the adjusting screw

counterclockwise.

TO LIGHT PILOT AND MAI N BURNERS:

1. Turn “off” electric power to unit.

2. Turn room thermostat to lowest setting.

3. Turn gas valve knob to “on” position.

4. Turn “on” electric power to unit.

5. Set room thermostat to desired temperature.
(If thermostat “set” temperature is above room temperature,
pilot burner ignition will occur and, after an interval to prove
pilot flame, mai n bu rn er s w il l ig ni te ).

TO SHUT DOWN:

1. Turn “off” electric power to unit.

2. Depress knob of gas valve while turning to “off” position.

POST-START CHECK LIST (GAS)

After the entire control circuit has been energized and the
heating section is operating, make the following checks:

1. Check for g as le aks i n the unit pipi ng as wel l as t he su pply
piping.

2. Check for correc t manifol d gas press ures. See “Che cking
Gas Input”.

3. Check the supply gas pressure. It must be within the limits
shown on rating nameplate. Supply pressure should be
checked with all gas appliances in the building at full fire.
At no time should the standby gas line pr essure exceed 13",
nor the operating pressure drop below 5.3" for natural gas
units. If gas pressure is outside these limits, contact the
local gas utility for corrective action.

MANIFOLD GAS PRESSURE ADJUSTMENT

Small adjustments to the high-fire gas flow may be made by
turning the pressure regulator adjusting screw on the automatic
gas valve. Refer to Figure 12.

Adjust as follows:

ON-OFF CONTROL

3. To increase the gas pressure, turn the adjusting screw

clockwise

.

NOTE: The correct manifold pressure for these furnaces is 3.5

±

0.3.

IWG

PILOT CHECKOUT

The pilot flame should envelope the end of the flame sensor.
Refer to Figure 13. To adjust pilot flame, (1) remove pilot
adjustment cover screw, (2) increase or decrease the
clearance for air to the desired le vel, (3) be sure to replac e
cover screw af ter a djus tme nt to pr even t pos sibl e ga s le akag e.

Put the sys tem into op eration and observe t hrough co mplete

BURNER ASSEMBLY BRACKET

FLAME SENSOR BULB

1/8" GAP BETWEEN CARRY-OVER
TUBE AND FLAME SENSOR BULB

CARRY-OVER TUBE

FIG. 12

cycle to be sure all controls function properly.

- PROPER FLAME ADJUSTMENT

BURNER INSTRUCTIONS

To check or ch ange burners, pilot or orifices, CLOSE MAIN
MANUAL SHUT -OFF V ALVE AND SHUT OFF ALL POWER TO
THE UNIT.

1. Remove th e t w o s cr ew s ho ld in g either end of the ma ni fold
to the burner supports.

2. Open the uni on fit ti ng in the g as su pp ly li ne ju st upst re am
of the unit gas valve and downstream from the main manual
shut-of f va lve.

HIGH FIRE ADJ.
(UNDER SCREW)

PILOT AD J.
(UNDER SCREW)

FIG. 11

14 Unitary Products Group

- TYPICAL GA S VALVE

3. Remove the gas piping patch plate.

4. Disconnect wiring to the gas valve and spark ignitor.
Remove the mani fo ld -burner gas valve assem bl y b y l if ti ng
up and pulling back.

Burners are now accessible for service.
Reverse th e abov e pr oced ure to r epla ce th e ass embly. Make

sure that burners are level and seat at the rear of the heat
exchanger.

BURNER AIR SHUTTER ADJUSTMENT

Adjust burner shutters so no ye llow flame is observ ed in the
heat exchanger tubes. Refer to Figure 14.

CHECKING SUPPLY AIR CFM

511.17-N2W

2. Insert at least 8" of 1/4 inch tubing into each of these holes
for sufficient p enetration into th e air fl ow on bo th sides o f
the evaporator (or indoor) coil.

NOTE: The tubes must be inserted and held in a position

perpendicular to the air flow so that velocity pres­sure will not affect the static pressure readi ngs.

3. Using an incl ined manomet er , determ ine the pressu re drop
across a dry indo or coil. Since th e moisture on an indoo r
coil may vary greatly, measuring the pressure drop across
a wet coil under field conditions would be inaccurate. To
assure a dry c oil, the c ompress ors sho uld be de activa ted
while the test is being run.

FIG. 13

- TYPICAL FLAME APPEARANCE

The RPM of the supply air blower will depend on the required CFM,
the unit accessories and the static resistances of both the supply
and the return air duct systems. With this information, the RPM for
the supply air blower can be determined from the blower
performance data in Table 5 .

Knowing the required blower RPM and the blower motor HP,
the setting ( tu rn s op en ) fo r th e su pp ly a ir mo to r pu ll ey c an b e
determined from Table 10.

Start the supply air blower motor. Adjust the resistances in both

TABLE 10 -

SUPPLY AIR B LOW ER MOTOR PULLEY
ADJUSTMENT

TURNS

OPEN*

5 975 860
4 1024 906
3 1073 952
2 1122 998
1 1171 1044
0 1220 1090

*Pulleys can be adjusted in half-turn increments.

the supply and th e return air duct sy stems to balanc e the air
distribution throughout the conditioned space. The job
specifications may require that this balancing be done by
someone other than the equipment installer.

BLOWER DRIVE RANGE (RPM)

7-1/2 TON 10 TON

4. Knowing the pressure drop across a dry coil, the actual
CFM through the un it can be de te rm i ne d f ro m th e c ur ve in
Figure 16.

WARNING:Failure to properly adjust the total system air quan-

tity can result i n extensive blower damage.

After readings have been obtained, remove the tubes and seal
up the drilled ho les in the side panels. 5/16" dot plugs (P/N
029-13880) are available through normal parts ordering
procedures.

T o check the supply air CFM after the initial balancing has been
completed:

1. Remove the dot pl ugs from the filter access and bl ower
access panels as shown in Figure 8.

Unitary Products Group 15

FIG. 14 -

PRESSURE DROP ACROSS A DRY INDOOR

COIL VS SUPPLY AIR CFM

511.17-N2W

ADJUSTMENT OF TEMPERATURE RISE

The temperatur e rise (o r temperature d ifference be tween the
return air and t he heated air fro m the furnace ) must lie wit hin
the range shown on the U.L. or CGA rating plate and the data
in Table 2.

After the temperature rise has been determined, the cfm can
be calculated as follows:

CFM =

Btuh Input x 0.8

o

F Temp. Rise

1.08 x

After about 20 minutes of operation, determine the furnace
temperature ris e. Take readings of both t he re turn air an d the
heated air in the ducts (about six feet from t he fu rnace) where
they will not be affected by radiant heat. Increase the blower
cfm to decrea se the temp erature r ise; decrea se the blow er cfm
to increase the rise. Refer to Table 8 for blower mot or and drive
data.

BELT DRIVE BLOWER
All units have belt drive single-speed blower motors. The

variable pi tch pulley on the blower motor can be adjusted t o
obtain the desired supply air CFM.

CHECKING GAS INPUT

NA T URAL GAS

1. Turn off all other gas appliances connected to the gas meter .

2. With the furnace turned on, measure the time needed for
one revolution of th e hand on the smalles t dial on the meter .
A typical gas meter usually has a 1/2 or a 1 cubic foot test
dial.

3. Using the number of seconds fo r each revolut ion and the
size of the test dial inc rement, find the c ubic feet of gas
consumed per hour from Table 11.

If the actual input is n ot within 5% o f the furnac e rating (with
allowance being made for the permissible range of the
regulator setting), replace the orifice spuds with spuds of the
proper size.

NOTE T o find the Btu input, multiply the number of cubic feet of

gas consumed per hour by the Btu content of the gas in
your particular locality (contact your gas company for this
information - it varies widely from city to city .)

TABLE 11

Example:

foot dial to make a revolution with just a 100,000 Btuh furnace running. Using this
information, interpolate for 19 seconds in the first column in the table above. Read
across to the column headed “1 Cubic Foot”, where you will see that 190 cubic
feet of gas per hour are consumed by the furnace at that rate. Multiply 190 x 1050
(the Btu rating of the gas obtained from the local gas company). The result is
199,500 Btuh, which is close to the 204,000 Btuh rating of the furnace.

- GAS RATE - CUBIC FEET PER HOUR

Seconds

for One

Rev.

10
12
14
16
18

20
22
24
26
28

30
32
34
36
38

40
42
44
46
48

50
52
54
56
58
60

By actual measurement, it takes 19 seconds for the hand on the 1-cubic

Size of Test Dial

1/2 cu. ft. 1 cu. ft.

180
150
129
113
100

90
82
75
69
64

60
56
53
50
47

45
43
41
39
37

36
35
34
32
31
30

360
300
257
225
200

180
164
150
138
129

120
113
106
100

95
90

86
82
78
75

72
69
67
64
62
60

SECURE OWNER’S APPROVAL:

When the system is functioning properly, secure the owner’s approval. Show him
the location of all disconnect sw itches and the thermostat. Teach him how to start and stop the unit and how to adjust tem­perature settings witnin the limitations of the system.

16 Unitary Products Group

MAINTENANCE

NORMAL MAINTENANCE

CAUTION: Prior to any of the following ma intenance proce-

dures, shut off all power to the unit to prevent
personal injury.

Periodic maintenance normally consists of changing or
cleaning filt ers and (unde r some condit ions) cl eaning the ma in
burners.

FIL TERS - Insp ect once a mo nth. Replac e disposabl e or clean
permanent type as necessary. DO NOT replace permanent
type with disposable.

MOTORS - Indoor fan and outdoor fan motors are permanently
lubricated and require no maintenance. Ventor motor is factory
lubricated for an estimated 10 year lif e.

OUTDOOR COIL - Dirt should not be allow ed to accumulate
on the outdoor coil surface or other parts in the air circuit.
Cleaning sho uld be as o ften as nece ssar y to kee p coi l cle an.
Use a brush, vacuum cleaner attachme nt, or other suitable
means. If wate r is used to clean co il , be sure power t o the unit
is shut off pri or to cleaning.

NOTE: Exercise c are when cl eaning the coil so that th e coil

fins are not damag ed.
Do not permit the outdoor air discharge to be ob-

structed by over ha nging structures of sh ru bs .

BURNER & PILOT - Periodically (at least annually at the
beginning of eac h heat ing se ason ) mak e a visu al che ck of the
pilot and main burner flame. If necessary, adjust main burner
primary air shut ters so that no yellow flame is obse rved as
explained under “BURNER AIR SHUTTER ADJUSTMENT” . If
it is not possible to adjust for the proper flame, the burners may
need cleaning.

511.17-N2W

CLEANING FLUE PASSAGES AND HEA TING
ELEMENTS

With proper c ombustion adjustme nt the hea ting eleme nt of a
gas fired furnace will seldom need cleaning. If the element
should become sooted, it can be clea ned as follows:

1. Remove the burner assembly as outlined in “BURNER
INSTRUCTIONS”.

2. Remove the roof over the gas heat section.

3. At the top front of the heat section, remove the screws
holding th e top of th e flue co llec tor box. Ca refull y remove
the top of the flue co llector b ox witho ut rippin g the adja cent
insulation.

4. On the in side of the flue c ollector box, re move the flue b affle
from the tube interiors.

5. Using a wire br ush o n a fl exib le wan d, brus h out the insi de
of each heat exchanger from the burner inlet and flue outlet
ends.

6. Brush out the insi de of th e flue c ollect or box a nd the flu e
baffles.

7. Run the wire brush down the vent tube from the flue
collector end.

8. If soot build-up is particularly bad, remove the vent motor
and clean the wheel and housing. Run the wire brush down
the flue extensions at the outlet of the vent housing.

9. After brushing is complete, blow all brushed areas with air
or nitrogen. V acuum as needed.

TO CLEAN BURNERS - Remove them from the furnace as
explained in “ Burner Instruc tions”. Clean b urners with ho t water
applied along to p of the burner .

COMBUSTION AIR DISCHARGE - Visually inspect discharge
outlet period ically to make sur e that the buildup of soot and di rt
is not excessive. If necessary, clean to maintain adequate
combustion air discharge.

10.Replace parts in the order they were removed in Steps
1 through 4.

1 1. When replacing the top of the flue collector box, be careful

so as not to tear the adjoining insulation.

12.Assure that all seams on the vent side of the combustion
system are air tight. Apply a high temperature (+500°F)
sealing compound where needed.

Unitary Products Group 17

511.17-N2W

TROUBLESHOOTING

WARNING:Troubleshooting of components necessarily re-

quires opening the electrical control box with the
power conne cted to the unit. Use ex treme care
when working with live circuits! Check the unit
nameplate for the correct line voltag e and set th e
volt meter to th e c orre ct ra nge b ef or e maki ng an y
connections w it h line terminals.

WARNING: Prio r to any of the f ollowing maintenanc e proce-

dures, shut off all electric power to the unit to
prevent personal injury.

CAUTION: Label all wires prior to disconnection when servic-

ing controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after
servicing.

NOTE T o find the Btu input, multiply the number of cubic feet of

gas consumed per hour by the Btu content of the gas in
your particular locality (contact your gas company for this
information - it varies widely from city to city .)

1. Draft motor operates and furnace lights but supply air
blower does not start after a shor t time delay with room
thermostat fan switch set to “AUTO”.

a. Set fan switch to “ON”. If blower motor runs, go to Step f.

If it does not, check to see if line voltage is being
supplied to th e contacts of the con tactor (M 3), and if the
contactor is pulled in. Check for loose wiring.

b. If (M3) is pulled in , touch the sup ply air blower motor

housing. If it is hot, the motor may be off on inherent
protection. D i sc on ne ct power to the unit and c he ck t he
blower motor capacitor. If it is defective, replace it with
one of equal capa citance and voltage.

c. If (M3) is pulled in and the blow er motor still does not

run, replace the blower motor.

d. If (M3) is not pulled in, check for 24 volts at the (M3) coil.

If 24 volts is prese nt , re pl ac e th e (M 3 ) co nt ac to r.

e. If 24 volts is not present at the (M3) coil, check for loose

24 volt wi ring back to the r elay board. Check control
wiring to th e roo m ther mosta t. If al l is fi ne, re plac e th e
relay board.

f. If the blower motor runs with the fan switch in the “ON”

position but does not run soon after the furnace has
ignited with the fan switch in the “AUTO” position, check
for loose 24 volt wiring between the relay board in the
main control box, the Mate-N-Lok connector in the
partition bet ween the evaporat or and g as heat sections
and the time delay (BT) or (ETD).

g. If all control wiring is fine, check for 24 volts at the relay

board. If 24 volts is pre se nt, re pl ac e th e re la y bo ard. If
24 volts is not present, replac e the (BT) or (ETD).

NOTE: The furnace ma y shu t its elf dow n on a hig h tempera -

ture condition during the procedure, but this will not
effect the test if it is done withi n 5 min utes of fu rnac e
shut-down.

2. The supply ai r blower oper ates but the draft moto r does not
when the room thermostat is set to call for heat and the fan
switch in the “ON” position.

a. The draft motor has inherent protection. If the motor shell

is hot to the touch, wait for the internal overload to reset.

b. If the motor shell is cold with the room thermostat calling

for heat, check for line voltage at the motor’s Mate-N­Lok connector attached to the evaporator partition. If
line voltage is present, replace the draft motor.

c. If line voltage i s not pres ent, check for line volt age at

the draft moto r relay (DMR) or (DMC) contacts in th e
main control box and check to see if the (DMR) or
(DMC) is pulled in.

d. If the (DMR) relay is pulled in, check for a loose line

voltage connec tion.

e. If the (DMR) or (DMC) relay is not pulled in, check for

24 volts at the (DMR) coil or 24 volts at the DMC-6
terminal. If 2 4 volts is present, replace the (DMR) or
(DMC) relay. If 24 volts is not present, check for a loose
24 volt conne ction back t o the relay bo ard and check
the connections from the room thermostat to the relay
board. If all connecti ons are cor rect, repl ace the rela y
board.

3. The draft m otor runs b ut th e fur nace do es no t lig ht an d the
sparker does not spa r k .

a. Check all 24 volt conn ections from the re lay board to

and in the gas heat section. Check low voltage connec­tions to the (BT) & (DMC) or (ETD) located in the c ontrol
box.

b. If the furnace is hot, it may be out on an over tempera-

ture condition, wait for limit reset.

c. With the draft motor running, check for 24 volts at

terminal 25V on the ignitor control (IC) wher e the red
lead from the draft motor attaches. If 24 volts is not
present, the ce ntrifugal s witch (CS) has no t closed or
has gone bad. Check the li ne voltage to the unit, if it is
correct replac e the draf t motor. If lin e volta ge is lo w call
the power company.

d. If 24 volts is present at the ignitor control, check all

control wiring at the i gnit or co ntro l and the high ten sion
wire to the i gnitor. Check that the gr een ground wire s
from the ignitor control, the gas valve and pilot burner
are all intac t and making good electrical connec tion.
Check to make sure tha t the ceramic insul ator on the
pilot ignitor or sensor i s no t br oken or cr acke d, if all a re
intact replace the ignition control “IC”.

4. The draft motor r uns and the sparker sparks at the pilot
burner but the pilot do es not ignit e and a gas odor is not
detected at the draft motor outlet.

a. Check to make sure gas is being supp lied to the un it.

Make sure that the gas pressure to the unit is within the
proper limi ts as described in the “POS T ST ART CHECK
LIST” and th at the pilot adj ust s crew is a llowing some
flow of gas as descri bed i n “PIL OT C HECKO UT”.

b. Check all wiring between th e ignitor cont rol and the gas

valve. Check to mak e sur e th e gr ound con nect ions are
intact.

c. If the wiring is intact, ch eck for 24 v olts across terminals

“PV” and “COMMON” on the ignitor control. If 24 volts
is not present, repl ac e th e ig ni to r control.

18 Unitary Products Group

d. If 24 volts is present, remove the pilot burner and

remove the pilot or ifice fro m the pil ot burner. The orifi ce
is removed in the direction opposite the flow of gas.
Inspect the orifice for obstruction. If it is clear, replace
the main gas valv e.

5. The spark er sparks at the p ilot burn er but th e pilot does not
ignite and a gas odor is detected at the dr aft motor outlet.

a. Adjust the pilot adjust screw on the gas valve as

described in “PIL OT C HECKOUT” .

b. Check the supply pressure as described in “POST

ST ART CHECK LIST”. Make adjustments as necessary.

c. Chec k the pilot or ifice for obstr uction as desc ribed in

Item 4. Clean as neede d but the pr oblem shoul d not be
the gas valve.

6. The pilot b urner ignites but the sparke r continues to spark
and the main burn er s do not ignite.

a. Make the same checks and adjustment as described in

Item 5.

b.Make sure that the pilot burner is not bent or damaged.
c. Make sure that the ground connections at the pilot

burner, gas valve and i gnitor control a re inta ct. Chec k

511.17-N2W

the high tens ion wire for good elec trical c onnectio n. If
all are intact, re pl ac e th e ig ni to r m od ul e.

7. The pilot burne r lights and the spark stops bu t the main
burners do not lig ht.

a. Check electric al connec tions bet ween the ig nitor con -

trol and the gas valve. If i ntact, chec k for 24 vo lts across
terminals “MV” an d “COMMON” terminal s. If no voltage
detected, re place ignito r control. If voltag e is present,
replace gas valve.

8. Furnace lights with roll out or one burner has delayed
ignition.

a. Make sure that the pilot burner is aligned properly with

the carryover as desc ribe d in “ PILO T CHEC KOUT ”.

b. Make sure that the carryovers on adjoining burners are

screwed fast and are level with respect to one another.

9. Main burners light but exhibit erratic flame characteristics.

a. Adjust air shutters as described in “BURNER AIR

SHUTTER ADJUSTMENT”.

b. Check the main burner orifices for obstruction and

alignment. Removal procedure is described in
“BURNER INSTRUCTIONS”. Clean or replace burner
orifices and burners as needed.

REPLACEMENT PARTS

COMPRESSOR SECTION

•

Hermetic compressor

•

Compressor mounting

MOTOR SECTION

•

Blower motor

•

Fan motor

•

Ventor motor

ELECTRICAL SECTION

•

Ignition control

•

Relay board

•

Contactor

•

Circuit breaker

•

Temperat ur e controls

•

Capacitors

•

Relays

•

Transformers

•

Connectors

TO OBTAIN PARTS INFORMATION: Replacement parts and information from OUR current parts list for this unit are available to
your servicing contractor through our local distributor. The name and address of our nearest distributor may be obtained by
consulting the Yellow Pages of a local telephone directory.

IMPORT ANT:

complete model number listed on the rating plate located on your unit. See page 2 for Product Nomenclature.

WARNING: IMPROPER INSTALL ATION, ADJUST MENT , SERVICE OR MAINTENANCE CAN CAUSE INJUR Y OR PROPERTY
DAMAGE. CONSUL T A QUALIFIED INST ALLER, SERVICE AGENCY OR YOUR LOCAL GAS SUPPLIER FOR I NFORMATI ON
OR ASSIST ANCE.

In order to supply the correct part or information from the parts list, our distributor wil l need to be provided with the

GAS HEAT SECTION

•

Heat exchanger

•

Gas valve

•

Pilot

•

Flame sensor

•

Spark ignitor

•

Gas manifold

•

Gas burner

AIR MOVING SECTION

•

Blower wheel

•

Blower wheel housing

REFRIGERANT SECTION

•

Evaporator coil

•

Evaporator coil header

•

Expansion valve as se m bly

•

Condenser co il

•

Condenser coi l header

FABRICATED PARTS SECTION

•

Panels

•

Posts

•

Covers Drain pans

•

Base rails

•

Air hoods

MISCELLANEOUS SECTION

•

Air inlet hood screen

•

Fan guard

•

Air filters

Unitary Products Group 19

Subject to change without notice. Printed in U.S.A.
Copyright  by Unitary Products Group 19958 All rights reserved.

Unitary
Products
Group

Post Office
Box 1592

York
Pennsylvania
17405-1592

Code: EBL, F

511.17-N2W