York DNX024, DNX036, DNX048 Installation Manual

GZKDJRRJDGHZ2[JZFJR

R-410A
AFFINITY SERIES

DNX024-048
2-4 Ton

TABLE OF CONTENTS

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

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

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

Location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Rigging And Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Ductwork. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Filters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Condensate Drain. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Service Access . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Thermostat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Power And Control Wiring. . . . . . . . . . . . . . . . . . . . . . . . . 10

Compressors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Phasing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Gas Heat. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Flue Vent Hood. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Airflow Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Blower Speed Selection . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Heating Sequence Of Operation. . . . . . . . . . . . . . . . . . . . 22

Cooling Sequence Of Operations . . . . . . . . . . . . . . . . . . . 24

Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Adjustment of Temperature Rise . . . . . . . . . . . . . . . . . . . 27

Checking Gas Heat Input . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Natural Gas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Typical Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

LIST OF TABLES

1 Unit Limitations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2 Weights and Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Unit Accessory Weights . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4 Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5 Unit Clearances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

6 Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

7 Natural Gas Pipe Sizing Chart . . . . . . . . . . . . . . . . . . . . 16

8 Propane (LP) Gas Pipe Sizing Chart . . . . . . . . . . . . . . . 16

9 Natural Gas Application Data-Single St age . . . . . . . . . . 17

10 Natural Gas Application Data-Two Stage . . . . . . . . . . . . 17

11 Propane (LP) Gas Application Data-Single St ag e . . . . . 17

12 Propane (LP) Gas Application Data-Two Stage . . . . . . . 17

13 Side Duct Application . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

14 Bottom Duct Application . . . . . . . . . . . . . . . . . . . . . . . . . 19

15 Additional Static Resistance . . . . . . . . . . . . . . . . . . . . . . 21

16 Indoor Blower Specifications . . . . . . . . . . . . . . . . . . . . . . 21

17 Delay Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

18 Ignition Control Board FLASH CODES . . . . . . . . . . . . . . 24

19 Gas Rate Cubic Feet Per Hour . . . . . . . . . . . . . . . . . . . . 27

ISO 9001

Certified Quality

Management System

LIST OF FIGURES

1 Component Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2 Unit 4 Point Load Weight . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4 Dimensions Front and Bottom . . . . . . . . . . . . . . . . . . . . . 8

5 Dimensions Back and Bottom . . . . . . . . . . . . . . . . . . . . . 8

6 Roof Curb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

7 Typical Field Control Wiring Diagram Single Stage

Thermostat - Single Stage Gas Heat . . . . . . . . . . . . . . . 10

8 Typical Field Control Wiring Diagram Single Stage

Thermostat - Two Stage Gas Heat . . . . . . . . . . . . . . . . 11

9 Typical Field Control Wiring Diagram Two Stage

Thermostat - Single Stage Gas Heat . . . . . . . . . . . . . . . 11

General

YORK® Affinity Model DNX units are cooling/heating air
conditioners designed for outdoor installation. Only gas piping,
electric power and duct connections are required at the point of
installation.

The single or two stage gas-fired heaters have spark to pilot
ignition. The tubular heat exchangers are aluminized steel.

The refrigerant system is fully charged with R-410A Refrigerant,
and is tested and factory sealed.

10 Typical Field Control Wiring Diagram Two Stage

Thermostat - Two Stage Gas Heat . . . . . . . . . . . . . . . . 12

11 Typical Field Power Wiring Diagram . . . . . . . . . . . . . . . 12

12 External Supply Connection External Shut-Off . . . . . . . 15

13 Flue Vent Outlet Air Hood . . . . . . . . . . . . . . . . . . . . . . . 16

14 Control Board Speed Tap Location . . . . . . . . . . . . . . . . 22

15 Single Stage Gas Valve Front . . . . . . . . . . . . . . . . . . . . 25

16 Two Stage Gas Valve Front . . . . . . . . . . . . . . . . . . . . . . 26

17 Single Stage Gas Valve Rear . . . . . . . . . . . . . . . . . . . . 26

18 Two Stage Gas Valve Rear . . . . . . . . . . . . . . . . . . . . . . 26

19 Proper Flame Adjustment . . . . . . . . . . . . . . . . . . . . . . . 26

20 R-410A Quick Reference Guide . . . . . . . . . . . . . . . . . . 36

Safety Considerations

This is a safety alert symbol . When you see this symbol on
labels or in manuals, be alert to the potential for personal injury.

Understand and pay particular attention the signal words

DANGER, WARNING or CAUTION.
DANGER indicates an imminently hazardous situation, which,

if not avoided, will result in death or serious injury
WARNING indicates a potentially hazardous situation, which,

if not avoided, could result in death or serious injury
CAUTION indicates a potentially hazardous situation, which, if

not avoided may result in minor or moderate injury
used to alert against unsafe practices and hazards involving
only property damage.

.

.

. It is also

279550-YIM-A-0207

Improper installation may create a condition where the
operation of the product could cause personal injury or
property damage. Improper installation, adjustment,
alteration, service or maintenance can cause injury or
property damage. Refer to this manual for assistance or
for additional information, consult a qualified contractor,
installer or service agency.

This product must be installed in strict compliance with
the installation instructions and any applicable local,
state and national codes including, but not limited to
building, electrical, and mechanical codes.

Before performing service or maintenance operations on
unit, turn off main power switch to unit. Electrical shock
could cause personal injury. Improper installation,
adjustment, alteration, service or maintenance can
cause injury or property damage. Refer to this manual.
For assistance or additional information consult a
qualified installer, service agency or the gas supplier.

This system uses R-410A Refrigerant which operates at
higher pressures than R-22. No other refrigerant may be
used in this system. Gage sets, hoses, refrigerant
containers and recovery systems must be designed to
handle R-410A. If you are unsure, consult the equipment
manufacturer. Failure to use R-410A compatible servicing
equipment may result in property damage or injury.

279550-YIM-A-0207

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, or service this equipment.
Untrained personnel can perform basic maintenance functions
of cleaning coils and filters and replacing filters.

Observe all precautions in the literature, labels, and tags
accompanying the equipment whenever working on air
conditioning equipment. Be sure to follow all other applicable
safety precautions and codes including ANSI Z223.1 or CSA­B149.1- latest edition.

Wear safety glasses and work gloves. Use quenching cloth and
have a fire extinguisher available during brazing operations.

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
damage should be noted on the carrier’s freight bill. A separate
request for inspection by the carrier’s agent should be made in
writing.

This product must be installed in strict compliance with
the enclosed installation instructions and any applicable
local, state and national codes including, but not limited
to, building, electrical, and mechanical codes.

The furnace and its individual shut-off valve must be
disconnected from the gas supply piping system during
any pressure testing at pressures in excess of 1/2 PSIG.

Pressures greater than 1/2 PSIG will cause gas valve
damage resulting in a hazardous condition. If it is
subjected to a pressure greater than 1/2 PSIG, the gas
valve must be replaced.

The furnace must be isolated from the gas supply piping
system by closing its individual manual shut-off valve
during any pressure testing of the gas supply piping
system at test pressures equal to or less than 1/2 PSIG

If the information in this manual is not followed exactly, a
fire or explosion may result causing property damage,
personal injury or loss of life.
Do not store or use gasoline or other flammable vapors
and liquids in the vicinity of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS:
a. Do not try to light any appliance.
b. Do not touch any electrical switch; do not use any

phone in your building.

c. Immediately call your gas supplier from a neighbor’s

phone. Follow the gas supplier’s instructions.

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

department.

Installation and service must be performed by a qualified
installer, service agency or the gas supplier.

2 Unitary Products Group

Reference

Additional information is available in the following reference
forms:

• Technical Guide - DNX024-048, 291625

• General Installation - DNX024-048, 279550

Renewal Parts

®

Contact your local York

parts distribution center for authorized

replacement parts.

Approvals

Design certified by CSA as follows:

1. For use as a cooling only unit, cooling un it wi th

supplemental electric heat or a forced air furnace.

2. For outdoor installation only.

279550-YIM-A-0207

3. For installation on combustible material and may be
installed directly on combustible flooring or, in the U.S., on
wood flooring or Class A, Class B or Class C roof covering
materials.

4. For use with natural gas (convertible to LP with kit).

This product must be installed in strict compliance with
the enclosed installation instructions and any applicable
local, state, and national codes including, but not limited
to, building, electrical, and mechanical codes.

Nomenclature

Improper installation may create a condition where the
operation of the product could cause personal injury or
property damage.

This system uses R-410A Refrigerant which operates at
higher pressures than R-22. No other refrigerant may be
used in this system.

Product Category

D = Single Package Air Conditioner

Product Generation

1 = 1st Generation
2 = 2nd Generation

NX = R-410A 15 SEER

D 1 036 036 06

Product Identifier

Gas Heat/Electric

NX

Factory Installed Gas Heat

N = Single Stage
D = Two Stage

Nominal Cooling Capacity (MBH)

024 = 24,000 BTUH
036 = 36,000 BTUH

Installation

Installation Safety Information

Read these instructions before continuing this appliance
installation. This is an outdoor combination heating and cooling
unit. The installer must assure that these instructions are made
available to the consumer and with instructions to retain them
for future reference.

1. Refer to the unit rating plate for the approved type of gas
for this product.

2. Install this unit only in a location and position as specified
on Page 5 of these instructions.

3. Never test for gas leaks with an open flame. Use
commercially available soap solution made specifically for
the detection of leaks when checking all connections, as
specified on Pages 3 and 16 of these instructions.

4. Always install furnace to operate within the furnace's
intended temperature-rise range with the duct system and
within the allowable external static pressure range, as
specified on the unit name/rating plate, specified on
Page 17 of these instructions.

5. This equipment is not to be used for temporary heating of
buildings or structures under construction.

N

Voltage Code

06 = 208/230-1-60
25 = 208/230-3-60
46 = 460-3-60

Nominal Gas Heating Output Capacity

(Nominal Low Gas Heat Output Capacity)

036 = 36,000 BTUH
056 = 56,000 BTUH (36,400 BTUH)
065 = 65,000 BTUH
072 = 72,000 BTUH (46,800 BTUH)
090 = 90,000 BTUH (56,160 BTUH)

048 = 48,000 BTUH

FIRE OR EXPLOSION HAZARD
Failure to follow the safety warning exactly could result

in serious injury, death or property damage.
Never test for gas leaks with an open flame. use a

commercially available soap solution made specifically
for the detection of leaks to check all connections. A fire
or explosion may result causing property damage,
personal injury or loss of life.

Limitations

These units must be installed in accordance with the following:
In U.S.A.:

1. National Electrical Code, ANSI/NFPA No. 70 - Latest Edition

2. National Fuel Gas Code, ANSI Z223.1 - Latest Edition

3. Gas-Fired Central Furnace Standard, ANSI Z21.47a. ­Latest Edition

4. Local building codes, and

5. Local gas utility requirements

110 = 110,000 BTUH (70,200 BTUH)

Unitary Products Group 3

279550-YIM-A-0207

In Canada:

1. Canadian Electrical Code, CSA C22.1

2. Installation Codes, CSA - B149.1.

3. Local plumbing and waste water codes, and

4. Other applicable local codes.
Refer to unit application data found in this document.
After installation, gas fired units must be adjusted to obtain a

temperature rise within the range specified on the unit rating plate.

Blow-Through Design With

Reliable Aluminized Steel
Tubular Heat Exchangers

Long Lasting Powder

Paint Finish

Rear and Bottom Return Air

and Supply Airduct Openings

If components are to be added to a unit to meet local codes,
they are to be installed at the dealer’s and/or customer’s
expense.

Size of unit for proposed installation should be based on heat
loss/heat gain calculation made according to the methods of Air
Conditioning Contractors of America (ACCA).

This furnace is not to be used for temporary heating of buildings
or structures under construction.

Direct Drive

Condenser Fan Motor

Highly Efficient Enhanced Copper

Tube/Aluminum Fin Evaporator Coil

Highly Efficient Enhanced Copper

Tube/Aluminum Fin Condenser Coil

Decorative Protective

Coil Guard

High Efficiency

Compressor Rigidly

Mounted

Heavy Gauge

Removable Base Rails

Direct Drive Blower Motor With

Slide-Out Blower Assembly

Figure 1: Component Location
Table 1: Unit Limitations

Size

(Tons)

024

(2.0)

036

(3.0)

048

(4.0)

Unit Voltage

208/230-1-60 187 252 115
208/230-1-60 187 252 115

208/230-3-60 187 252 115

460-3-60 432 504 115
208/230-1-60 187 252 115
208/230-3-60 187 252 115

460-3-60 432 504 115

Power Draft Motor

Min Max Max (°F)

Pilot Assembly

High Grade Aluminized In-Shot Burners

Low Voltage Terminal Block

Self-Diagnostic Controls

Automatic Gas Valve (1/2" - 14 NPTI)

High Voltage

Terminal Block

Unit Limitations

Applied Voltage Outdoor DB Temp

4 Unitary Products Group

279550-YIM-A-0207

Location

Use the following guidelines to select a suitable location for
these units:

1. Unit is designed for outdoor installation only.

2. Condenser coils must have an unlimited supply of air.
Where a choice of location is possible, position the unit on
either north or east side of building.

3. Suitable for mounting on roof curb.

4. For ground level installation, a level pad or slab should be
used. The thickness and size of the pad or slab used
should meet local codes and unit weight. Do not tie the
slab to the building foundation.

5. Roof structures must be able to support the weight of the
unit and its options/accessories. Unit must be installed on a
solid, level roof curb or appropriate angle iron frame.

6. Maintain level tolerance to 1/8” across the entire width and
length of unit.

Excessive exposure of this furnace to contaminated
combustion air may result in equipment damage or
personal injury. Typical contaminates include:
permanent wave solution, 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.

codes. Refer to Table 5 for clearances required for combustible
construction, servicing, and proper unit operation.

Do not permit overhanging structures or shrubs to
obstruct condenser air discharge outlet, combustion air
inlet or vent outlets.

Rigging And Handling

Exercise care when moving the unit. Do not remove any
packaging until the unit is near the place of installation. Rig the
unit by attaching chain or cable slings to the lifting holes
provided in the base rails. Spreader bars, whose length
exceeds the largest dimension across the unit, MUST be used
across the top of the unit.

If a unit is to be installed on a roof curb other than a
York® roof curb, gasketing must be applied to all
surfaces that come in contact with the unit underside.

Before lifting, make sure the unit weight is distributed
equally on the rigging cables so it will lift evenly.

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

Clearances

All units require particular clearances for proper operation and
service. Installer must make provisions for adequate
combustion and ventilation air in accordance with section 5.3 of
Air for Combustion and Ventilation of the National Fuel Gas
Code, ANSI Z223.1 – Latest Edition (in U.S.A.), or Sections 7.2,

7.3, or 7.4 of Gas Installation Codes, CSA-B149.1 (in Canada) -

Latest Edition, and/or applicable provisions of the local building

Unitary Products Group 5

All panels must be secured in place when the unit is
lifted.

The condenser coils should be protected from rigging
cable damage with plywood or other suitable material.

'

279550-YIM-A-0207

)5217

2)

81,7

$



Figure 2: Unit 4 Point Load Weight
Table 2: Weights and Dimensions

Size

(Tons)

024

(2.0)

036

(3.0)

048

(4.0)

Weight (lbs.) Center of Gravity 4 Point Load Location (lbs.)

ShippingOperatingX YABCD

445 440 20 24.5 127 93 93 127

445 440 20 24.25 126 91 93 129

505 500 20 24 142 102 107 149

&(17(52)

*5$9,7<

&

;

%

<



Table 3: Unit Accessory Weights

Unit Accessory Model

Add Economizer All 45 40

Shipping Operating

Weight (lbs.)

6 Unitary Products Group

279550-YIM-A-0207

*$66833/<

',$0(7(5+2/(

137,&211(&7,21

81,7&21'(16$7(

&211(&7,21137,

75$35(&200(1'('

+,*+92/7$*(

&211',$

.12&.287

*$66833/<

',$.12&.287

137,&211(&7,21

.12&.287[+2/(

%/2:(56(59,&($&&(66

%





/2:92/7$*(

&211',$

9(17$,5287/(7+22'

&203$570(173$1(/





29(5$//











&21'(16(5&2,/





29(5$//

$



5()5,*(5$17

&211(&7,216

&20%867,21$,5

,1/(7/289(56

)5217

*$6(/(&75,&&21752/

6(59,&($&&(66

&203$570(173$1(/

Figure 3: Unit Dimensions
Table 4: Unit Dimensions

Unit Size

024 33-1/2 18-1/4

036, 048 41-1/2 23-1/8

Table 5: Unit Clearances1

Direction

3

Top
Front 36 Left 24
Rear 0 Bottom

1. A 1" clearance must be provided between any combustible material and the supply air duct work.

2. The products of combustion must not be allowed to accumulate within a confined space and recirculate.

3. Units must be installed outdoors. Over hanging structure or shrubs should not obscure condenser air
discharge outlet.

4. Units may be installed on combustable floors made from wood or class A, B or C roof covering
materials.

“A” “B”

2

Distance

(in.)

36 Right 12

Dimensions

Direction

Distance

(in.)

4

0

Unitary Products Group 7

+,*+92/7$*(

&211

',$.12&.287







)5217

279550-YIM-A-0207

*$66833/<

',$.12&.287

137,&211(&7,21

/2:92/7$*(

&211',$

.12&.287

&21'(16$7('

5$,1137,



Figure 4: Dimensions Front and Bottom

&21'(16(5

%277206833/<

$,523(1,1*

&2,/

6,'(6833/<

$,523(1,1*











%$&.



6,'(5(7851

$,523(1,1*





Figure 5: Dimensions Back and Bottom

8 Unitary Products Group









%277205(7851



$,523(1,1*









279550-YIM-A-0207







5(&200(1'('

'8&76,=(

[







23(1,1*)25

5(7851$,5'8&7



Figure 6: Roof Curb



1

Ductwork

These units are adaptable to downflow use as well as rear
supply and return air duct openings. To convert to downflow,
use the following steps:

1. Remove the duct covers found in the bottom return and
supply air duct openings. There are four (4) screws
securing each duct cover (save these screws to use in
Step 2).

2. Install the duct covers (removed in step one) to the rear
supply and return air duct openings. Secure with the four
(4) screws used in step one.

3. Seal duct covers with silicone caulk.

Duct work should be designed and sized according to the
methods of the Air Conditioning Contractors of America
(ACCA), as set forth in their Manual D.

A closed return duct system shall be used. This shall not
preclude use of economizers or ventilation air intake. Flexible
joints may be used in the supply and return duct work to
minimize the transmission of noise.

NOTE: Be sure to note supply and return openings.
Refer to Figures 4 and 5 for information concerning rear and

bottom supply and return air duct openings.



23(1,1*)25

6833/<$,5'8&7

5(&200(1'('

'8&76,=(

[



Roof Curb

On applications when a roof curb is used, the unit must be
positioned on the curb so the front of the unit is tight against the
curb.

Filters

Single phase units are shipped without a filter or filter racks. It is
the responsibility of the installer to secure a filter in the return air
ductwork or install a Filter/Frame Kit (1FF0110).

A filter rack and high velocity filters are standard on three phase
units.

Filters must always be used and must be kept clean. When
filters become dirt laden, insufficient air will be delivered by the
blower, decreasing your units efficiency and increasing
operating costs and wear-and-tear on the unit and controls.

Filters should be checked monthly; this is especially important
since this unit is used for both heating and cooling.

Condensate Drain

A condensate trap is recommended to be installed in the
condensate drain. The plumbing must conform to local codes.

Use a sealing compound on male pipe threads. Install the
condensate drain line (3/4” NPTF) to spill into an open drain.

1. 8” Roof Curb also available.

Unitary Products Group 9

279550-YIM-A-0207

Service Access

Access to all serviceable components is provided at the
following locations:

• Blower compartment access panel

• Gas control/electrical access panel

• Refrigerant connections

Refer to Figure 3 for location of these access locations and
minimum clearances in Table 5.

This system uses R-410A Refrigerant which operates at
higher pressures than R-22. No other refrigerant may be
used in this system. Gage sets, hoses, refrigerant
containers and recovery systems must be designed to
handle R-410A. If you are unsure, consult the
equipment manufacturer. Failure to use R-410A
compatible servicing equipment may result in property
damage or injury.

Thermostat

The room thermostat should be located on an inside wall
approximately 56" above the floor where it will not be subject to
drafts, sun exposure or heat from electrical fixtures or
appliances. Follow manufacturer's instructions enclosed with
the thermostat for general installation procedure. Color coded
insulated wires (minimum #18 AWG) should be used to connect
thermostat to unit. See Figures 7 thru 10.

Power And Control Wiring

Field wiring to the unit must conform to provisions of the current
N.E.C. ANSI/NFPA No. 70 or C.E.C. and/or local ordinances.
The unit must be electrically grounded in accordance with local
codes or, in their absence, with the N.E.C./C.E.C. Voltage
tolerances which must be maintained at the compressor
terminals during starting and running conditions are indicated
on the unit Rating Plate and Table 6.

The wiring entering the cabinet must be provided with
mechanical strain relief.

A fused disconnect switch should be field provided for the unit.
If any of the wire supplied with the unit must be replaced,
replacement wire must be of the type shown on the wiring
diagram.

Wear safety glasses and gloves when handling
refrigerants. Failure to follow this warning can cause
serious personal injury.

Refer to Figure 20 for the R-410A Quick Reference Guide.

6,1*/(67$*(

7+(50267$7

 0LQLPXPZLUHVL]HRI$:*
ZLUHVKRXOGEHXVHGIRUDOOILHOG
LQVWDOOHGYROWZLUH

352*5$00$%/(

7+(50267$721/<

5

*

<

:

&

Electrical line must be sized properly to carry the load. Each
unit must be wired with a separate branch circuit fed directly
from the meter panel and properly fused.

Refer to Figures 7 thru 11 for typical field wiring and to the
appropriate unit wiring diagram for control circuit and power
wiring information.

127(+($7$17,&,3$725

81,7&21752/%2$5'

7(50,1$/675,3



<<

:

5

*

<





&

-803(51(('(')25)8//63(('

6+28/'%(6(7$7
$036)25$//02'(/6

&2035(662523(5$7,21

92/7

75$16)250(5

Figure 7: Typical Field Control Wiring Diagram Single Stage Thermostat - Single Stage Gas Heat

10 Unitary Products Group

279550-YIM-A-0207

** = Minimum wire size of 18 AWG
wire should be used for all field
installed 24 volt wire.

SINGLE STAGE

THERMOSTAT

R

G

Y

UNIT CONTROL BOARD

TERMINAL STRIP

**

R

G

Y

1

NOTE: HEAT ANTICIPATOR
SHOULD BE SET AT 0.35
AMPS FOR ALL MODELS.

JUMPER NEEDED FOR FULL SPEED

COMPRESSOR OPERATION

Y/Y

2

W

W

C

1

W

2

C

PROGRAMMABLE

THERMOSTAT ONLY

Figure 8: Typical Field Control Wiring Diagram Single Stage Thermo stat - Two Sta ge Gas Heat

127(+($7$17,&,3$725
6+28/'%(6(7$7
$036)25$//02'(/6

 0LQLPXPZLUHVL]HRI$:*
ZLUHVKRXOGEHXVHGIRUDOOILHOG
LQVWDOOHGYROWZLUH

67$*(

7+(50267$7

5

*

<



<



:

81,7&21752/%2$5'

7(50,1$/675,3



5

*

<



<<



:

24 VOLT

TRANSFORMER

92/7

75$16)250(5

352*5$00$%/(

7+(50267$721/<

Figure 9: Typical Field Control Wiring Diagram Two Stage Thermostat - Single Stage Gas Heat

Unitary Products Group 11

&

&

** = Minimum wire size of 18 AWG
wire should be used for all field
installed 24 volt wire.

2 STAGE

THERMOSTAT

R

G

Y

1

UNIT CONTROL BOARD

TERMINAL STRIP

**

R

G

Y

1

279550-YIM-A-0207

NOTE: HEAT ANTICIPATOR
SHOULD BE SET AT 0.35
AMPS FOR ALL MODELS.

Y

2

W

1

W

2

C

Y/Y

W

W

C

2

1

2

PROGRAMMABLE

THERMOSTAT ONLY

Figure 10: Typical Field Control Wiring Diagram Two Stage Thermostat - Two Stage Gas Hea t

Figure 11: Typical Field Power Wiring Diagram
Table 6: Electrical Data

Size

(Tons)

024

(2.0)

036

(3.0)

048

(4.0)

Volt

208/230-1-60 10.2 52 16 1.4 4.3 18.1 25
208/230-1-60 16.6 82 26 0.9 9.1 30.7 40

208/230-3-60 11.1 58 17 0.9 9.1 23.8 30

460-3-60 4.5 29 7 0.5 4.6 10.7 15
208/230-1-60 21.1 96 33 1.8 9.1 36.3 45
208/230-3-60 13.4 88 21 1.8 9.1 26.7 35

460-3-60 6.4 41 10 0.9 4.6 13.0 15

Compressors

(each)

RLA LRA MCC FLA FLA

OD Fan

Motors

(each)

Supply
Blower

Motor

MCA

(Amps)

1. Minimum Circuit Ampacity.

2. Maximum Over Current Protection per standard UL 1995.

3. Fuse or HACR circuit breaker size installed at factory or field installed.

1

Max

Fuse

Breaker

Size

(Amps)

2

/

3

24 VOLT

TRANSFORMER

12 Unitary Products Group

279550-YIM-A-0207

DNX024-048 Single Stage Gas Heat

Component

Nominal Tonnage 2.0 3.0 4.0

ARI COOLING PERFORMANCE

Gross Capacity @ ARI A point (Btu) 24.6 38.4 50.0
ARI net capacity (Btu) 24.0 37.0 48.0
EER 11.5 12.3 11.2
SEER 15.0 16.5 15.0
Nominal CFM 800 1275 1550
System power (KW) 2.1 3.0 4.3
Refrigerant type R-410A R-410A R-410A
Refrigerant charge (lb-oz) 7-8 9-12 9-8

ARI HEATING PERFORMANCE

Heating model 36 56 65 90 65 90 110
Heat input (K Btu) 45 70 80 108 80 108 135
Heat output (K Btu) 36 56 64 87 64 87 108
AFUE % 80.0 80.0 80.0 80.0 80.0 80.0 80.0
Steady state efficiency (%) 80808080808080
No. burners 2334345
No. stages 1111111
Temperature Rise Range (ºF) 25-55 30-60 25-55 45-75 25-55 35-65 45-75
Gas Limit Setting (ºF) 140 160 140 160 150 170 160
Gas piping connection (in.) 1/2 1/2 1/2

DIMENSIONS (inches)

Length 49 1/8 49 1/8 49 1/ 8
Width 47 1/4 47 1/4 47 1/4
Height 33 1/2 41 1/2 41 1/2

OPERATING WT. (lbs.) 440 480 500

COMPRESSORS

Type Scroll 2-spd Scroll 2-spd Scroll 2-spd
Quantity 1 1 1

CONDENSER COIL DATA

Face area (Sq. Ft.) 11.7 14.7 14.7
Rows 2 2 2
Fins per inch 20 20 20
Tube diameter (in.) 3/8 3/8 3/8
Circuitry Type Interlaced Interlaced Interlaced

EVAPORATOR COIL DATA

Face area (Sq. Ft.) 3.4 4.4 4.4
Rows 2 3 3
Fins per inch 15 16 16
Tube diameter 3/8 3/8 3/8
Circuitry Type Interlaced Interlaced Interlaced
Refrigerant control TXV TXV TXV

CONDENSER FAN DATA

Quantity 1 1 1
Fan diameter (Inch) 22 22 22
Type Prop Prop Prop
Drive type Direct Direct Direct
No. speeds 1 2 1
Number of motors 1 1 2
Motor HP each 1/4 1/3 1/3
RPM 1100 900/1100 900/1100
Nominal total CFM 2400 2400 3000

DIRECT DRIVE EVAP FAN DATA

Quantity 1 1 1
Fan Size (Inch) 10 x 8 11 x 10 11 x 10
Type Centrifugal Centrifugal Centrifugal
Motor HP each 1/2 1 1
RPM Variable Variable Variable
Frame size 48 48 48

FILTERS

Quantity - Size 1 - 20 x 20 x 1 2 - 20 x 12 x 1 2 - 20 x 12 x 1

DNX024 DNX036 DNX048

Models

Unitary Products Group 13

DNX024-048 Two Stage Gas Heat

Component

Nominal Tonnage 2.0 3.0 4.0

ARI COOLING PERFORMANCE

Gross Capacity @ ARI A point (Btu) 24.6 38.4 50.0
ARI net capacity (Btu) 24.0 37.0 48.0
EER 11.5 12.3 11.2
SEER 15.0 16.5 15.0
Nominal CFM 800 1275 1550
System power (KW) 2.1 3.0 4.3
Refrigerant type R-410A R-410A R-410A
Refrigerant charge (lb-oz) 7-8 9-12 9-8

ARI HEATING PERFORMANCE

Heating model 56 90 90 110
Heat input (K Btu) 70/45.5 108/70.2 108/70.2 135/87.8
Heat output (K Btu) 56/36.4 87/56.2 87/56.2 108/70.2
AFUE % 80.0 80.0 80.0 80.0
Steady state efficiency (%) 80 80 80 80
No. burners 3 4 4 5
No. stages 2 2 2 2
Temperature Rise Range (ºF) 30-60 45-75 35-65 45-75
Gas Limit Setting (ºF) 160 175 170 160
Gas piping connection (in.) 1/2 1/2 1/2

DIMENSIONS (inches)

Length 49 1/8 49 1/8 49 1/8
Width 47 1/4 47 1/4 47 1/4
Height 33 1/2 41 1/2 41 1/2

OPERATING WT. (lbs.) 440 480 500

COMPRESSORS

Type Scroll 2-spd Scroll 2-spd Scroll 2-spd
Quantity 1 1 1

CONDENSER COIL DATA

Face area (Sq. Ft.) 11.7 14.7 14.7
Rows 222
Fins per inch 20 20 20
Tube diameter (in.) 3/8 3/8 3/8
Circuitry Type Interlaced Interlaced Interlaced

EVAPORATOR COIL DATA

Face area (Sq. Ft.) 3.4 4.4 4.4
Rows 233
Fins per inch 15 16 16
Tube diameter 3/8 3/8 3/8
Circuitry Type Interlaced Interlaced Interlaced
Refrigerant control TXV TXV TXV

CONDENSER FAN DATA

Quantity 1 1 1
Fan diameter (Inch) 22 22 22
Type Prop Prop Prop
Drive type Direct Direct Direct
No. speeds 1 2 1
Number of motors 1 1 2
Motor HP each 1/4 1/3 1/3
RPM 1100 900/1100 900/1100
Nominal total CFM 2400 2400 3000

DIRECT DRIVE EVAP FAN DATA

Quantity 1 1 1
Fan Size (Inch) 10 x 8 11 x 10 11 x 10
Type Centrifugal Centrifugal Centrifugal
Motor HP each 1/2 1 1
RPM Variable Variable Variable
Frame size 48 48 48

FILTERS

Quantity - Size 1 - 20 x 20 x 1 2 - 20 x 12 x 1 2 - 20 x 12 x 1

DNX024 DNX036 DNX048

Models

279550-YIM-A-0207

14 Unitary Products Group

279550-YIM-A-0207

Compressors

The scroll compressor used in this product is specifically
designed to operate with R-410A Refrigerant and cannot be
interchanged.

This system uses R-410A Refrigerant which operates at
higher pressures than R-22. No other refrigerant may be
used in this system.

The compressor also uses a polyolester (POE oil), Mobil 3MA
POE. This oil is extremely hydroscopic, meaning it absorbs
water readily. POE oil can absorb 15 times as much water as
other oils designed for HCFC and CFC refrigerants. Take all
necessary precautions to avoid exposure of the oil to the
atmosphere.

Do not leave the system open to the atmosphere. Unit
damage could occur due to moisture being absorbed by
the POE oil in the system. This type of oil is highly
susceptible to moisture absorption

POE (polyolester) compressor lubricants are known to cause
long term damage to some synthetic roofing materials.

Scroll compressors require proper rotation to operate
properly. Failure to check and correct rotation may result
in property damage.

Gas Heat

These single or two stage gas-fired heaters have aluminized­steel tubular heat exchangers with spark to pilot ignition.

Gas Piping

Proper sizing of gas piping depends on the cubic feet per hour
of gas flow required, specific gravity of the gas and the length of
run. National Fuel Gas Code Z223.1 or CSA B149.1 should be
followed in all cases unless superseded by local codes or gas
company requirements. Refer to Tables 7 and 8.

The heating value of the gas may differ with locality. The value
should be checked with the local gas utility.

NOTE: There may be a local gas utility requirement specifying

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

Gas Connection

The gas supply line can be routed through the hole located on
the left side of the unit. Refer to Figure 3 to locate these access
openings. Typical supply piping arrangements are shown in
Figure 12.

Exposure, even if immediately cleaned up, may cause
embrittlement (leading to cracking) to occur in one year
or more. When performing any service that may risk
exposure of compressor oil to the roof, take precautions
to protect roofing.

Procedures which risk oil leakage include, but are not limited to,
compressor replacement, repairing refrigerant leaks, replacing
refrigerant components such as filter drier, pressure switch,
metering device or coil.

Units are shipped with compressor mountings which are
factory-adjusted and ready for operation.

Do not loosen compressor mounting bolts.

Phasing

Three-phase, scroll compressors operate in only one dire ction.
If the scroll is drawing low amperage, has similar suction and
discharge pressures, or is producing a high noise level, the
scroll is misphased. Change the incoming line connection
phasing to obtain the proper rotation.

Gas piping requirements:

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

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 dope
should be applied sparingly to male threads only.

$8720$7,&*$69$/9(

[81,21

[*$6&2&.

137

'5,3/(*

Figure 12: External Supply Connection External Shut-Off

Unitary Products Group 15

279550-YIM-A-0207

Table 7: Natural Gas Pipe Sizing Chart

Length
In Feet

10 132 278 520 1,050
20 92 190 350 730
30 73 152 285 590
40 63 130 245 500
50 56 115 215 440
60 50 105 195 400
70 46 96 180 370
80 43 90 170 350
90 40 84 160 320

100 38 79 150 305

1. 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 specific gravity gas).

Nominal Inches Iron Pipe Size

1/2” 3/4” 1” 1-1/4”

1

Table 8: Propane (LP) Gas Pipe Sizing Chart

Length
In Feet

10 275 567 1,071 2,205
20 189 393 732 1,496
30 152 315 590 1,212
40 129 267 504 1,039
50 114 237 448 913
60 103 217 409 834
70 96 196 378 771
80 89 185 346 724
90 83 173 322 677

100 78 162 307 630

1. Maximum capacity of pipe in thousands of BTU per hour
(based upon a pressure drop of 0.5 inch water column).

Nominal Inches Iron Pipe Size

1/2” 3/4” 1” 1-1/4”

Limitations, shown on Page 3. After the gas connections
have been completed, open the main shut-off valve
admitting normal gas pressure to the mains. Check all
joints for leaks with soap solution or other material suitable
for the purpose. NEVER USE A FLAME.

FIRE OR EXPLOSION HAZARD
Failure to follow the safety warning exactly could result

in serious injury, death or property damage.
Never test for gas leaks with an open flame. use a

commercially available soap solution made specifically
for the detection of leaks to check all connections. A fire
or explosion may result causing property damage,

1

personal injury or loss of life.

6. The furnace must be isolated from the gas supply piping
system by closing its individual manual shut-off valve
before conducting any pressure testing of the gas supply
piping system at test pressures equal to or less than 1/2
psig (3.48 kPa).

Flue Vent Hood

The flue vent hood with screen is shipped loose. This hood must
be installed to assure proper unit operation. The hood must be
fastened to the outside of the side gas control/electrical
compartment with the screws provided in the bag attached to the
inside of the gas control/electrical compartment, see Figure 13.

If flexible stainless steel tubing is allowed by the
authority having jurisdiction, wrought iron or steel pipe
must be installed at the gas valve and extend a
minimum of two (2) inches outside of the unit casing.

Natural gas may contain some propane. Propane being
an excellent solvent, will quickly dissolve white lead or
most standard commercial compounds. Therefore, a
special pipe dope must be applied when wrought iron or
steel pipe is used. Shellac base compounds such as
gaskoloc or stalastic, and compounds such as
rectorseal # 5, Clyde’s or John Crane may be used.

4. All piping should be cleaned of dirt and scale by
hammering 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

Flue hood surfaces may be hot.

9(17287/(76&5((1

)/8(9(17287/(7

$,5+22'

Figure 13: Flue Vent Outlet Air Hood

The flue exhaust hood must be properly installed and
within the recommended clearances. Further commu­nications and action must be given to the home or
building owner(s) to eliminate any unauthorized human
contact around this area during the heating cycle. Flue
hood surface and the immediate area reach high tem­peratures during the heating cycle.

16 Unitary Products Group

279550-YIM-A-0207

Table 9: Natural Gas Application Data-Single Stage

Temp. Rise ºF

At Full Input

Min. Max.

Available On Models

Input

(MBH)

1

Output

(MBH)

Gas Rate

Ft.3/Hr.

2

Number of

Burners

2 Ton 45 36 42 2 25 55
2 Ton 70 56 65 3 30 60

3,4 Ton 80 64 74 3 25 55

3 Ton 108 87 100 4 45 75
4 Ton 108 87 100 4 35 65
4 Ton 135 108 126 5 45 75

1. Heating capacity valid for elevations up to 2000 feet above sea level. For elevations above 2,000 feet, rated capacity should be reduced by
4% for each 1,000 feet above sea level.

2. Based on 1075 BTU/Ft.

3

.

3. The air flow must be adequate to obtain a temperature rise within the range shown. Continuous return air temperature should not be below 55°F.

Table 10: Natural Gas Application Data-Two Stage

Ft.3/Hr.

2

Number of

Burners

Temp. Rise ºF

At Full Input

Min. Max.

Available On Models

Input

1

(MBH)

High Fire/Low Fire

Output

(MBH)

High Fire/Low Fire

Gas Rate

High Fire/Low Fire

2 Ton 70 / 45.5 56 / 36.4 65 / 42 3 30 60
3 Ton 108 / 70.2 87 / 56.2 100 / 65 4 45 75
4 Ton 108 / 70.2 87 / 56.2 100 / 65 4 35 65
4 Ton 135 / 87.75 108 / 70.2 126 / 82 5 45 75

1. Heating capacity valid for elevations up to 2000 feet above sea level. For elevations above 2,000 feet, rated capacity should be reduced by
4% for each 1,000 feet above sea level.

2. Based on 1075 BTU/Ft.

3

.

3. The air flow must be adequate to obtain a temperature rise within the range shown. Continuous return air temperature should not be below 55°F.

Table 11: Propane1 (LP) Gas Application Data-Single Stage

Temp. Rise ºF

At Full Input

Min. Max.

Available On Models

Input Capacity

(Mbh)

2

Output Capacity

(Mbh)

Gas Rate

Ft.3/Hr.

3

Number of Burners

2 Ton 45 36 18 2 25 55
2 Ton 70 56 28 3 30 60

3,4 Ton 80 64 32 3 25 55

3 Ton 108 87 43 4 45 75
4 Ton 108 87 43 4 35 65
4 Ton 135 108 54 5 45 75

1. Propane applications are accomplished by field installation of a Propane Conversion A cce ssory, M odel 1 NP0807 f or 2 Ton u nit with 33-1 /2”
tall cabinet and Model 1NP0808 for 3 and 4 To n un it s wit h 41 -1/2” tall cabinet s.

2. Heating capacity valid for elevations up to 2,000 feet above sea level. For elevations above 2,000 feet, rated capacity should be reduced
by 4% for each 1,000 feet above sea level.

3. Based on 2500 BTU/Ft.

3

.

4. The air flow must be adequate to obtain a temperature rise within the range shown. Continuous return air temperature should not be below 55°F.

Table 12: Propane1 (LP) Gas Application Data-Two Stage

Ft.3/Hr.

3

Number of Burners

Temp. Rise ºF

At Full Input

Min. Max.

Gas Rate

High Fire/Low Fire

Available On Models

Input Capacity

(Mbh)

2

High Fire/Low Fire

Output Capacity

(Mbh)

High Fire/Low Fire

2 Ton 70 / 45.5 56 / 36.4 28 / 18.2 3 30 60
3 Ton 108 / 70.2 87 / 56.2 43 / 27.95 4 45 75
4 Ton 108 / 70.2 87 / 56.2 43 / 27.95 4 35 65
4 Ton 135 / 87.75 108 / 70.2 54 / 35.1 5 45 75

1. Propane applications are accomplished by field installation of a Propane Conversion A cce ssory, M odel 1 NP0809 f or 2 Ton u nit with 33-1 /2”
tall cabinet and Model 1NP0810 for 3 and 4 To n un it s wit h 41 -1/2” tall cabinet s.

2. Heating capacity valid for elevations up to 2,000 feet above sea level. For elevations above 2,000 feet, rated capacity should be reduced
by 4% for each 1,000 feet above sea level.

3. Based on 2500 BTU/Ft.

3

.

4. The air flow must be adequate to obtain a temperature rise within the range shown. Continuous return air temperature should not be below 55°F.

3

3

4

4

Unitary Products Group 17

Airflow Performance

Table 13: Side Duct Application

Size

(Tons)

024

(2.0)

036

(3.0)

048

(4.0)

Mode

Cool

Heat

Cool

Heat

Cool

Low

High

N036

N056

D056

Low

High

N065

N090

D090

Low

High

Thermostat

Input

Y1 COOL-A 600 100 122 145 169 194 221 249 279 310
Y1 COOL-B 450 65 81 100 122 147 176 208 243 281
Y1 COOL-C 530 81 100 121 145 170 197 226 258 291

Y1 COOL-D 680 127 151 176 202 228 256 284 313 342
Y1+Y2 COOL-A 800 177 204 232 261 290 320 350 382 414
Y1+Y2 COOL-B 600 100 122 145 169 194 221 249 279 310
Y1+Y2 COOL-C 700 134 159 184 211 238 265 293 323 352
Y1+Y2 COOL-D 900 229 258 288 319 351 385 420 457 494

W1 HEAT-A 670 123 147 172 197 224 251 - - ­W1 HEAT-B 730 146 172 198 225 252 280 - - ­W1 HEAT-C 790 173 199 227 255 284 314 - - ­W1 HEAT-D 850 202 230 259 289 319 351 - - ­W1 HEAT-A 940 253 281 312 344 378 - - - ­W1 HEAT-B 975 274 303 334 368 403 - - - ­W1 HEAT-C 1000 290 319 351 385 422 - - - ­W1 HEAT-D 1050 324 353 386 422 461 - - - ­W1 HEAT-A 670 123 147 172 197 224 - - - ­W1 HEAT-B 690 130 155 180 206 233 - - - ­W1 HEAT-C 710 138 163 189 215 242 - - - -

W1 HEAT-D 750 155 181 207 235 262 - - - ­W1+W2 HEAT-A 940 253 281 312 344 378 - - - ­W1+W2 HEAT-B 970 271 300 331 364 400 - - - ­W1+W2 HEAT-C 1000 290 319 351 385 422 - - - ­W1+W2 HEAT-D 1050 324 353 386 422 461 - - - -

Y1 COOL-A 900 198 233 272 313 358 406 458 512 569
Y1 COOL-B 760 166 190 222 262 310 366 431 503 584
Y1 COOL-C 830 180 210 245 286 332 384 441 503 571

Y1 COOL-D 970 221 260 302 344 388 434 481 530 579
Y1+Y2 COOL-A 1250 361 408 454 501 548 594 640 687 733
Y1+Y2 COOL-B 1050 253 296 340 384 428 472 516 561 605
Y1+Y2 COOL-C 1150 302 348 394 439 484 528 571 615 657
Y1+Y2 COOL-D 1350 429 475 522 570 620 671 723 777 831

W1 HEAT-A 1200 330 377 423 469 515 560 - - ­W1 HEAT-B 1300 394 440 487 535 583 631 - - ­W1 HEAT-C 1400 467 511 558 607 659 713 - - ­W1 HEAT-D 1500 550 590 635 686 743 804 - - ­W1 HEAT-A 1150 302 348 394 439 484 528 - - ­W1 HEAT-B 1225 345 392 439 485 531 577 - - ­W1 HEAT-C 1275 377 424 471 518 565 612 - - ­W1 HEAT-D 1350 429 475 522 570 620 671 - - ­W1 HEAT-A 740 163 185 216 255 304 362 - - ­W1 HEAT-B 785 170 196 230 270 317 372 - - ­W1 HEAT-C 825 178 208 243 284 330 382 - - -

W1 HEAT-D 870 189 223 260 301 347 396 - - ­W1+W2 HEAT-A 1150 302 348 394 439 484 528 - - ­W1+W2 HEAT-B 1220 342 389 436 482 528 573 - - ­W1+W2 HEAT-C 1280 380 427 474 521 568 616 - - ­W1+W2 HEAT-D 1350 429 475 522 570 620 671 - - -

Y1 COOL-A 1030 237 280 323 367 411 455 499 543 588
Y1 COOL-B 930 192 237 282 326 369 413 455 497 539
Y1 COOL-C 1070 257 300 343 386 430 475 520 565 611

Y1 COOL-D 1130 289 332 375 419 463 509 555 602 649
Y1+Y2 COOL-A 1550 586 640 696 752 810 869 929 991 1053
Y1+Y2 COOL-B 1400 466 513 561 611 663 715 770 826 882
Y1+Y2 COOL-C 1600 630 687 745 804 864 926 988 1052 1116
Y1+Y2 COOL-D 1700 723 787 851 916 982 1049 1116 1185 -

Speed

Tap

CFM

0.20.30.40.50.60.70.80.91.0

Watts Watts Watts Watts Watts Watts Watts Watts Watts

External Static Pressure (Inch Water Gauge)

279550-YIM-A-0207

18 Unitary Products Group

279550-YIM-A-0207

Table 13: Side Duct Application (Continued)

Size

(Tons)

048

(4.0)

Mode

Heat

N065

N090

D090

N110

D110

Thermostat

Input

W1 HEAT-A 1200 330 373 416 461 507 554 - - ­W1 HEAT-B 1300 394 439 484 531 579 629 - - ­W1 HEAT-C 1400 466 513 561 611 663 715 - - ­W1 HEAT-D 1500 544 596 648 702 758 815 - - ­W1 HEAT-A 1325 412 456 503 550 599 649 - - ­W1 HEAT-B 1400 466 513 561 611 663 715 - - ­W1 HEAT-C 1500 544 596 648 702 758 815 - - ­W1 HEAT-D 1600 630 687 745 804 864 926 - - ­W1 HEAT-A 870 168 215 261 306 350 393 - - ­W1 HEAT-B 920 188 233 278 322 366 409 - - ­W1 HEAT-C 985 216 260 303 347 391 434 - - -

W1 HEAT-D 1050 247 290 333 376 420 464 - - ­W1+W2 HEAT-A 1330 415 460 506 554 603 653 - - ­W1+W2 HEAT-B 1400 466 513 561 611 663 715 - - ­W1+W2 HEAT-C 1500 544 596 648 702 758 815 - - ­W1+W2 HEAT-D 1600 630 687 745 804 864 926 - - -

W1 HEAT-A1450504553604656-----

W1 HEAT-B1500544596648702-----

W1 HEAT-C1600630687745804-----

W1 HEAT-D1700723787851916-----

W1 HEAT-A940196241285329-----

W1 HEAT-B970209253297341-----

W1 HEAT-C1050247290333376-----

W1 HEAT-D1100273315358402----­W1+W2 HEAT-A1450504553604656----­W1+W2 HEAT-B1500544596648702----­W1+W2 HEAT-C1600630687745804----­W1+W2 HEAT-D1700723787851916-----

Speed

Tap

External Static Pressure (Inch Water Gauge)

CFM

0.20.30.40.50.60.70.80.91.0

Watts Watts Watts Watts Watts Watts Watts Watts Watts

Table 14: Bottom Duct Application

Size

(Tons)

024

(2.0)

Mode

Cool

Heat

Low

High

N036

N056

D056

Thermostat

Input

Y1 COOL-A 600 100 122 145 169 194 221 249 279 310
Y1 COOL-B 450 65 81 100 122 147 176 208 243 281
Y1 COOL-C 530 81 100 121 145 170 197 226 258 291

Y1 COOL-D 680 127 151 176 202 228 256 284 313 342
Y1+Y2 COOL-A 800 177 204 232 261 290 320 350 382 414
Y1+Y2 COOL-B 600 100 122 145 169 194 221 249 279 310
Y1+Y2 COOL-C 700 134 159 184 211 238 265 293 323 352
Y1+Y2 COOL-D 900 229 258 288 319 351 385 420 457 494

W1 HEAT-A 670 123 147 172 197 224 251 - - ­W1 HEAT-B 730 146 172 198 225 252 280 - - ­W1 HEAT-C 790 173 199 227 255 284 314 - - ­W1 HEAT-D 850 202 230 259 289 319 351 - - ­W1 HEAT-A 940 253 281 312 344 378 - - - ­W1 HEAT-B 975 274 303 334 368 403 - - - ­W1 HEAT-C 1000 290 319 351 385 422 - - - ­W1 HEAT-D 1050 324 353 386 422 461 - - - ­W1 HEAT-A 670 123 147 172 197 224 - - - ­W1 HEAT-B 690 130 155 180 206 233 - - - ­W1 HEAT-C 710 138 163 189 215 242 - - - -

W1 HEAT-D 750 155 181 207 235 262 - - - ­W1+W2 HEAT-A 940 253 281 312 344 378 - - - ­W1+W2 HEAT-B 970 271 300 331 364 400 - - - ­W1+W2 HEAT-C 1000 290 319 351 385 422 - - - ­W1+W2 HEAT-D 1050 324 353 386 422 461 - - - -

Speed

Tap

External Static Pressure (Inch Water Gauge)

CFM

0.20.30.40.50.60.70.80.91.0

Watts Watts Watts Watts Watts Watts Watts Watts Watts

Unitary Products Group 19

Table 14: Bottom Duct Application (Continue d)

Size

(Tons)

036

(3.0)

048

(4.0)

Mode

Cool

Heat

Cool

Heat

Low

High

N065

N090

D090

Low

High

N065

N090

D090

N110

D110

Thermostat

Input

Y1 COOL-A 900 198 233 272 313 358 406 458 512 569
Y1 COOL-B 760 166 190 222 262 310 366 431 503 584
Y1 COOL-C 830 180 210 245 286 332 384 441 503 571

Y1 COOL-D 970 221 260 302 344 388 434 481 530 579
Y1+Y2 COOL-A 1250 361 408 454 501 548 594 640 687 733
Y1+Y2 COOL-B 1050 253 296 340 384 428 472 516 561 605
Y1+Y2 COOL-C 1150 302 348 394 439 484 528 571 615 657
Y1+Y2 COOL-D 1350 429 475 522 570 620 671 723 777 831

W1 HEAT-A 1200 330 377 423 469 515 560 - - ­W1 HEAT-B 1300 394 440 487 535 583 631 - - ­W1 HEAT-C 1400 467 511 558 607 659 713 - - ­W1 HEAT-D 1500 550 590 635 686 743 804 - - ­W1 HEAT-A 1150 302 348 394 439 484 528 - - ­W1 HEAT-B 1225 345 392 439 485 531 577 - - ­W1 HEAT-C 1275 377 424 471 518 565 612 - - ­W1 HEAT-D 1350 429 475 522 570 620 671 - - ­W1 HEAT-A 740 163 185 216 255 304 362 - - ­W1 HEAT-B 785 170 196 230 270 317 372 - - ­W1 HEAT-C 825 178 208 243 284 330 382 - - -

W1 HEAT-D 870 189 223 260 301 347 396 - - ­W1+W2 HEAT-A 1150 302 348 394 439 484 528 - - ­W1+W2 HEAT-B 1220 342 389 436 482 528 573 - - ­W1+W2 HEAT-C 1280 380 427 474 521 568 616 - - ­W1+W2 HEAT-D 1350 429 475 522 570 620 671 - - -

Y1 COOL-A 1030 237 280 323 367 411 455 499 543 588
Y1 COOL-B 930 192 237 282 326 369 413 455 497 539
Y1 COOL-C 1070 257 300 343 386 430 475 520 565 611

Y1 COOL-D 1130 289 332 375 419 463 509 555 602 649
Y1+Y2 COOL-A 1550 586 640 696 752 810 869 929 991 1053
Y1+Y2 COOL-B 1400 466 513 561 611 663 715 770 826 882
Y1+Y2 COOL-C 1600 630 687 745 804 864 926 988 1052 1116
Y1+Y2 COOL-D 1700 723 787 851 916 982 1049 1116 1185 -

W1 HEAT-A 1200 330 373 416 461 507 554 - - ­W1 HEAT-B 1300 394 439 484 531 579 629 - - ­W1 HEAT-C 1400 466 513 561 611 663 715 - - ­W1 HEAT-D 1500 544 596 648 702 758 815 - - ­W1 HEAT-A 1325 412 456 503 550 599 649 - - ­W1 HEAT-B 1400 466 513 561 611 663 715 - - ­W1 HEAT-C 1500 544 596 648 702 758 815 - - ­W1 HEAT-D 1600 630 687 745 804 864 926 - - ­W1 HEAT-A 870 168 215 261 306 350 393 - - ­W1 HEAT-B 920 188 233 278 322 366 409 - - ­W1 HEAT-C 985 216 260 303 347 391 434 - - -

W1 HEAT-D 1050 247 290 333 376 420 464 - - ­W1+W2 HEAT-A 1330 415 460 506 554 603 653 - - ­W1+W2 HEAT-B 1400 466 513 561 611 663 715 - - ­W1+W2 HEAT-C 1500 544 596 648 702 758 815 - - ­W1+W2 HEAT-D 1600 630 687 745 804 864 926 - - -

W1 HEAT-A1450504553604656-----

W1 HEAT-B1500544596648702-----

W1 HEAT-C1600630687745804-----

W1 HEAT-D1700723787851916-----

W1 HEAT-A940196241285329-----

W1 HEAT-B970209253297341-----

W1 HEAT-C1050247290333376-----

W1 HEAT-D1100273315358402----­W1+W2 HEAT-A1450504553604656----­W1+W2 HEAT-B1500544596648702----­W1+W2 HEAT-C1600630687745804----­W1+W2 HEAT-D1700723787851916-----

Speed

Tap

External Static Pressure (Inch Water Gauge)

CFM

0.20.30.40.50.60.70.80.91.0

Watts Watts Watts Watts Watts Watts Watts Watts Watts

279550-YIM-A-0207

20 Unitary Products Group

279550-YIM-A-0207

Table 15: Additional Static Resistance

Size

(Tons)

024

(2.0)

036

(3.0)

048

(4.0)

CFM Wet Indoor Coil Economizer

500 0.01 0.00 0.01 ­600 0.01 0.00 0.02 ­700 0.01 0.00 0.04 ­800 0.02 0.01 0.06 -

900 0.03 0.01 0.08 ­1000 0.04 0.01 0.10 ­1100 0.05 0.01 0.13 ­1200 0.06 0.02 0.16 -

700 0.01 0.00 0.04 -

800 0.02 0.01 0.06 -

900 0.03 0.01 0.08 ­1000 0.04 0.01 0.10 ­1100 0.05 0.01 0.13 ­1200 0.06 0.02 0.16 ­1300 0.07 0.03 0.17 ­1400 0.08 0.04 0.18 ­1100 0.02 0.02 0.04 ­1200 0.03 0.02 0.04 ­1300 0.04 0.02 0.05 ­1400 0.05 0.03 0.05 ­1500 0.06 0.04 0.06 ­1600 0.07 0.04 0.07 ­1700 0.07 0.04 0.08 ­1800 0.08 0.04 0.09 ­1900 0.09 0.05 0.10 ­2000 0.09 0.05 0.11 -

1. The pressure drop through the economizer is greater for 100% outdoor air than for 100% return air. If the resistance
of the return air duct is less than 0.25 IWG, the unit will deliver less CFM during full economizer operation.

1

Filter/Frame Kit Electric Heat

Table 16: Indoor Blower Speci fications

Size

(Tons)

024

(2.0)

036

(3.0)

048

(4.0)

HP RPM Eff. SF Frame

1/2 Variable 0.8 1.0 48

1 Variable 0.8 1.0 48

1 Variable 0.8 1.0 48

Motor

Blower Speed Selection

The variable speed blowers are designed to deliver constant
CFM regardless of the external static pressure (ESP) in the
ductwork. Therefore, if too many supply registers are closed, a
filter becomes clogged, or there is a restriction in the ductwork,
the motor will automatically operate at a higher speed to
compensate for the higher ESP. This may result in a higher
operating sound level.

These units have variable speed motors that automatically
adjust to provide constant CFM from 0.2" to 0.6" w.c. static
pressure. From 0.6" to 1.0" static pressure, CFM is reduced by
2% per 0.1" increase in static. Operation on duct systems with
greater than 1.0" w.c. external static pressure is not
recommended.

To Set Cooling CFM for DNX Units:

Refer to Airflow Performance Tables 13 and 14 for the possible
cooling speed CFM selections.

Set “COOL” and “ADJ” Jumpers on the CFM selection board as
indicated in Tables 13, 14 and Figure 14.

NOTE: CFM indicator light flashes once for every 100 CFM

(i.e. 12 flashes = 1200 CFM).

Do not change the "ADJ" tab position on the CFM
selection board as this will change your cooling CFM
previously selected.

To Set Delay Profile:
Every unit has multiple cooling “blower off delay” profiles to

optimize system performance and efficiency. Refer to Table 17
for the regional climate in your area. Place the “DELAY” jumper
tap on the CFM selection board on the appropriate pin setting.

Factory Set Gas Heat CFM:
The blower speed required for gas heat is different than for

cooling. The heating CFM is factory set, but is adjustable.

Unitary Products Group 21

279550-YIM-A-0207

The “Heat” Jumper on the CFM selection board should be
set to “A”.

Fan Only CFM:
When the connection is made from “R” to “G”, the fan only

mode is activated. In this mode, the blower will deliver 75% of
the cooling system CFM. This connection is factory set from the
manufacturer, but can be field adjusted.

:

:

5

<<

<

Figure 14: Control Board Speed Tap Location
Table 17: Delay Profile

Delay Tap Regional Climate Type

Jumper at “A” Standard Setting
Jumper at “B” Humid Climate
Jumper at “C” Dry Climate
Jumper at “D” Temperate Climate

Operation

The unit is controlled by a conventional heating/coo ling thermostat
common to this class of equipment.

Heating Sequence Of Operation

Heat

The control board begins a call for heat when W1 is energized
(connected to R). The control ignores W2 until pilot ignition has
been established.

The control checks to see if the pressure switch is open. If the
pressure switch is closed, the control board flashes “3” on the
LED and waits indefinitely for it to open. When the pressure
switch is sensed as open, the control begins pressure switch
proving period. If the call for heat is lost, the control goes back
to Standby.

Pressure Switch Proving

The control board energizes the induced draft motor (High
speed for 2 stage model) and waits for the low pressure switch

to close. When the low pressure switch closes, the control
begins Pre-purge period. If the call for heat is lost, the control
de-energizes the inducer without post-purge and returns to
standby.

If the low pressure switch does not close within 10 seconds of
inducer energizing, the control board flashes “2” on the LED. If
the pressure switch does not close within 5 minutes of inducer
energizing, the control shuts off the inducer for 30 seconds,
then energizes the inducer for another 5 minute try to close the
pressure switch. This cycle continues indefinitely until either the
pressure switch is proved closed, or the call for heat ends.

Pre-purge

The control board monitors the low pressure switch and
ensures it remains closed during pre-purge. If the pressure
switch opens, the control goes back to pressure switch proving
mode. The control waits for a 15 second pre-purge period, then
begins the ignition trial

Ignition Trial Period

The control board energizes the pilot gas valve and spark
outputs for an 85 second Ignition trial. The control de-energizes
the spark when flame is sensed and enters a flame stabilization
period.

If flame is not established within the ignition trial period, the
control de-energizes the spark and gas valve and begins an
inter-purge period before attempting another ignition trial.

If the call for heat is lost during an ignition trial period, the
control immediately de-energizes spark and gas. The control
runs the inducer motor through a post purge period before de­energizing.

If the pressure switch is lost during an ignition trial period, the
control immediately de-energizes spark and gas. The control
begins pressure switch proving before an inter-purge and re­ignition attempt.

Pilot Flame Stabilization Period

The control board de-energizes the spark output, and waits for
a 2 second flame stabilization period before energizing the
main gas valve.

If flame is lost during the flame stabilization period, the control
board counts it as a flame loss and retries ignition or locks out
flashing a “5” on the LED.

Heat Blower On Delay

The control board waits for 30 seconds and then energizes the
indoor blower heat speed. Blower on delay time begins at the
start of flame proving period in the trial for ignition.

If the thermostat demand for heat is removed, the control de­energizes the gas valve, energizes the blower on heat speed
and initiates a post-purge and heat blower off delay.

22 Unitary Products Group

279550-YIM-A-0207

Main Burner Operation

High Heat Warm-up
Two stage models run high heat for the first 60 seconds

following Pilot Flame Stabilization period regardless of W2
demand. If W2 is not energized at the end of this 60 second
period the control de energizes the high gas output and steps
the inducer to low speed. If W2 is energized the control remains
on high heat.

There is no high heat warm-up on single stage models.
Low Heat

The control board keeps the pilot gas valve, main gas valve and
induced draft motor energized while continuously monitoring
the call for heat, low pressure switch, and flame status.

If the call for heat (W1) is lost, the control de-energizes the gas
valve and begins post purge.

If low pressure switch opens, the control de-energizes the gas
valve and begins pressure switch proving mode.

If flame is lost, the control de-energizes the gas valve within 2.0
second and counts the flame loss. If flame has been lost more
than 16 times within the same call for heat, the control board
locks out flashing “5” on the LED. If flame has been lost less
than 16 times, the control attempts re-ignition after a 300
second inter-purge period.

High Heat
If the W2 terminal was energized more than 1 second before

W1 at the start of the call for heat, and remains continuously
energized through the call for heat, the control considers it to be
connected to a single stage thermostat and implements a 10
minute Auto staging feature. The 2nd stage thermostat call is
ignored until 10 minutes into steady heat (9 minutes after high
heat warm-up ended).

The control recognizes a call for 2nd stage heat when W2 is
energized (connected to “R”). The control energizes the high
gas output and induced draft motor on high speed.

Heat Blower Off Delay

The control board de-energizes the indoor blower motor afte r a
delay time as selected by movable shunt (60, 90, 120 or 180
seconds). Blower timing begins when the thermostat is satisfied
or heat cycle was interrupted. The control returns to standby
when the blower off delay is complete.

If the thermostat call for heat returns before the blower off delay
is complete, the control begins an ignition sequence with pre­purge while the blower off delay continues.

Lockout

While in lockout, the control board keeps the pilot gas valve,
main gas valve and induced draft motor de-energized.

Lockouts due to failed ignition or flame losses may be reset by
removing the call for heat (W1) for more than 1 second, but less
than 20 seconds, or by removing power from the control for
over 0.25 seconds. The control will automatically reset lockout
after 60 minutes.

Lockouts due to detected internal control faults will reset after
60 minutes or power interruption.

High Temperature Limit Switch

Any time the high temperature limit switch is open the control
board will run the indoor blower motor on heat speed, the
inducer (on high speed for 2 stage models), de-energize the
gas valve, and flash “6” on the LED. When the high temperature
switch closes, the control will restart the ignition sequence
beginning with pre-purge.

Rollout Switch

If the rollout switch opens for more than 0.25 seconds, the
control board will run the inducer (on high speed for 2 stage
models) for a post-purge period, immediately de-energize the
gas valve, and flash “7” on the LED. The blower output will be
energized during an open rollout condition.

If the rollout switch closes, the control shall remain locked out
until power removed or “W” is removed.

If the call for 2nd stage heat goes away and the 1st stage call
remains, the control de energizes the high gas valve, drops
inducer speed to low, and returns to low heat operation.

Response to loss of W1, low pressure switch, and flame are
identical to low heat operation.

Post Purge

The control board runs the induced draft motor for a 30 second
post-purge period, and then de-energizes the inducer. If a call
for heat occurs during post-purge, the control finishes the post­purge, drops inducer out to re-prove open pressure switch
before continuing with the heat cycle.

Unitary Products Group 23

Rollout switch lockout shall not reset automatically.

Power Interruptions

Power interruptions of any duration shall not cause lockout or
any operation requiring manual intervention.

Flame present with Gas off

If flame is sensed for longer than 4.0 seconds during a period
when the gas valve should be closed, the control will enter
lockout flashing “8” on the LED. The control will turn on the
inducer blower while the flame is present.

279550-YIM-A-0207

Welded Gas Valve Relay Response.

If either or both Pilot and Main Gas valve outputs are sensed to
be off for more than 1 seconds when commanded to be on the
control board shuts off all outputs and enters a hard lockout

If the Pilot valve or Main valve output is sensed to be energized
for more than 1 second when commanded to be off, the control
de-energizes the induced draft motor (if flame is not present) to
attempt to open the pressure switch to de-energize the gas
valve. If the pilot or main gas valve is still sensed as energized
after the inducer has been off for 5 seconds, the control re­energizes the inducer to attempt to vent the unburned gas. In
either case, the control enters a hard lockout. If the pilot or main
valve becomes Un-Welded the inducer will de-energize, but the
control will remain in a hard lockout.

During a hard lockout, the control board LED will remain off and
the control will not respond to any thermostat demands.

The only way to recover from a hard lockout is to remove and
then reapply 24VAC power to the control board.

Safety Controls

The control circuit includes the following safety controls:

1. Limit Switch (LS) - This control is located inside the heat
exchanger compartment and is set to open at the
temperature indicated in the Temperature Controls Table
of the unit wiring diagram. It resets automatically. The limit
switch operates when a high temperature condition caused
by inadequate supply air flow occurs, thus shutting down
the ignition control and closing the main gas valve and
energizing the blower.

2. Pressure Switch (PS) - If the draft motor should fail, the
pressure switch prevents the ignition controls and gas
valves from being energized.

3. Flame Sensor - The flame sensor and controls are located
per Proper Flame Adjustment Figure 19. If an ignition
control fails to detect a signal from the flame sensor
indicating the pilot flame is properly ignited, then the main
gas valve will not open.

4. Rollout Switch (RS) - 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.

NOTE: The manual reset Rollout Switch (RS) must be reset

before allowing furnace operation.

5. Auxiliary Limit Switch (ALS) - This control is located
inside the heat exchanger compartment and is set to open
at 160°F. It is a manual reset switch. If ALS trips, then the
primary limit (LS) has not functioned correctly. Replace the
primary limit LS.

Table 18: Ignition Control Boar d FLASH CODES

Flash Code Description

On Steady Control Failure - Replace Control
Heart Beat Normal Operation

1 Flash Not Applicable
2 Flashes Pressure / Centrifugal Switch Open with Inducer On
3 Flashes Pressure / Centrifugal Switch Closed with Inducer Off
4 Flashes Not Applicable
5 Flashes Lock Out From Too Many Flame Losses
6 Flashes High Temperature Switch Open (Primary or Aux.)
7 Flashes Rollout Switch Open
8 Flashes Flame Present With Gas OFF

Cooling Sequence Of Operations

When the thermostat calls for first-stage cooling, the thermostat
terminals G and Y1 energize, signaling the compressor, indoor
blower and outdoor fan to operate. The indoor blower will operate
according to the fan delay profile selected using Table 17.

When the thermostat calls for second-stage cooling the
thermostat terminal Y2 energizes, signaling the compressor
bypass ports to close and the indoor blower to increase speed.
If the outdoor fan motor has an ECM controller, Y2 will also
signal the motor to increase speed.

When the thermostat is satisfied, terminals G, Y1 and Y2 are
de-energized, thus stopping operation of the compressor and
outdoor fan. The indoor blower will remain on according to the
fan delay profile selected using Table 17.

Safety Controls

The control circuit includes the following safety controls:

1. High Pressure Switch (HP)- This switch protects against
excessive discharge pressures due to a blocked
condenser coil or a condenser motor failure (opens at 625
± 25 psig and resets at 500 ± 25 psig).

2. Low Pressure Switch (LP)- This switch protects against
loss of refrigerant charge (opens at 7 ± 3 psig and resets at
22 ± 5 psig).

The above pressure switches are specifically designed to
operate with R-410A systems. R-22 pressure switches must not
be used as replacements for the R-410A pressure switches.

The ability to properly perform maintenance on this
equipment requires certain expertise, mechanical
skills, tools and equipment. If you do not possess
these, do not attempt to perform any maintenance
other than those procedures recommended in this
Installation Manual. Failure to heed this warning could
result in serious injury and possible damage to this
equipment.

24 Unitary Products Group

279550-YIM-A-0207

A

Circulating Fan

When the thermostat calls for FAN, the thermostat terminal G is
energized signaling the circulating fan to run at the heat speed
2 seconds after the G terminal is energized.

If a call for HEAT occurs, the circulating fan continues to run at
the heat speed.

If a call for COOL occurs, the circulating fan switches to cool
speed according to the fan delay profile selected in Table 17.

When the thermostat ends the call for FAN, the thermostat
terminal G is de-energized, de-energizing the circulating fan.

Start-Up

Prestart Check List

Complete the following checks before starting 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 outlet air hood has been properly
installed.

Operating Instructions

1. STOP! Read the information on the unit safety label.

2. Set the thermostat to the OFF position.

3. Turn off all electrical power to the unit.

4. DO NOT try to light the burners by hand. This appliance is
equipped with an ignition device which automatically lights
the burners.

5. Remove the access panel.

6. Turn the gas valve switch to the OFF position.

7. Wait five (5) minutes to clear out any gas. If you then smell
gas, STOP! Follow B in the information on the unit safety
label. If you don't smell gas, go to the next step.

8. Turn the gas valve switch to the ON position.

9. Replace the control access panel.

10. Turn on all electric power to the unit.

11. Set the thermostat to the desired setting.

12. If the unit will not operate, follow the instructions To Turn
Off Gas To Appliance and call your service technician or
gas supplier.

To Turn Off Gas To Unit

1. Set the thermostat to the OFF position.

2. Turn off all electric power to the appliance if service is to be
performed.

3. Remove the control access panel.

4. Turn the gas valve switch to the OFF position. DO NOT
FORCE.

5. Replace the control access panel.

Post Start Check List

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

1. Check for gas leaks in the unit piping as well as the supply
piping.

2. Check for correct manifold gas pressures. See Checking
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 pressure exceed 13.5",
nor the operating pressure drop below 4.5" 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 gas flow may be made by turning the
pressure regulator adjusting screw on the automatic gas valve.
Refer to Figures 15 and 16.

Manual
Gas Switch

Pilot

djustment

(Remove Cap)

Manifold
Pressure
Adjustment
(Remove Cap)

Pilot Gas
Connection

Figure 15: Single Stage Gas Valve Front

Electrical
Connection

½ NPT

(Outlet)

Manifold
Pressure Tap

Unitary Products Group 25

279550-YIM-A-0207

Hi Fire
(2nd Stage)
Manifold Pressure

Low Fire
(1st Stage)
Manifold Pressure

Manual

Adjustment

Gas
Switch

Pilot
Adjustment
(Remove Cap)

Pilot
Gas
Connect

Figure 16: Two Stage Gas Valve Front

Electrical
Connection

Manifold
Pressure
Tap

½ NPT

(Outlet)

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

NOTE: The correct manifold pressure for natural gas furnaces

is 3.5 IWG high heat and 1.5 IWG low heat. The correct
manifold pressure for propane (LP) is 10.0 IWG high
heat and 4.5 IWG low heat.

Burner Instructions

To check or change the burners, CLOSE THE MAIN MANUAL
SHUT-OFF VALVE AND SHUT OFF ALL POWER TO THE
UNIT.

1. Remove the two (2) #8 screws holding each burner in place.

2. Remove the burner assembly from the manifold assembly
by moving the burner assembly forward, turn at an angle
and pull back.

3. Burners are now accessible for service.

Pilot Instruction

To adjust the pilot flame:

3

"

min.

8

Line

½

NPT

(Inlet)

Pressure
Tap

Figure 17: Single Stage Gas Valve Rear

½ NPT

(Inlet)

Line Pressure
Tap

Figure 18: Two Stage Gas Valve Rear

Adjust as follows:

1. Remove the cap from the valve body. See Figures 15 and
16 for location.

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

Spark Ignitor

Pilot

Flame Sensor

Figure 19: Proper Flame Adjustment

1. Remove the pilot adjustment cover screw.

2. Adjust the pilot adjustment screw to achieve the proper
pilot flame.

3. The pilot flame should envelope 3/8” of the end of the flame
sensor and not contain any yellow color, see Figure 19.

4. Replace the pilot adjustment cover screw after the pilot
flame is set.

To check, adjust or remove the pilot assembly, CLOSE THE
MAIN MANUAL SHUT-OFF VALVE AND SHUT OFF ALL
POWER TO THE UNIT.

1. Disconnect the wiring from the control board to the pilot
assembly.

2. Remove the two (2) #8 screws holding the pilot assembly
in place.

3. Remove the pilot assembly.

26 Unitary Products Group

279550-YIM-A-0207

Adjustment of Temperature Rise

After about 20 minutes of high heat operation, determine the
furnace temperature rise. Take readings of both the return air
and the heated air in the ducts about six feet from the furnace
where they will not be affected by radiant heat.

The temperature rise (or temperature difference between the
return air and the heated air from the furnace) must lie within
the range shown on the rating plate and the data in Tables 9
and 11.

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

'HJUHHV)7HPS5LVH 

%78+2XWSXW

[&)0

25

&)0 

['HJUHHV)7HPS5LVH

Direct Drive Blower

All units have direct drive, constant CFM blower motors.

%78+2XWSXW

Checking Gas Heat Input

Natural 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 the hand on the smallest 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 for each revolution and the
size of the test dial increment, find the cubic feet of gas
consumed per hour from Table 19.

If the actual input is not within 5% of the furnace rating with
allowance being made for the permissible range of the regulator
setting, replace the orifice spuds with spuds of the proper size.

NOTE: To 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 since it varies widely from city to city.)

Table 19: Gas Rate Cubic Feet Per Hour

Seconds for

One Rev.

10 180 360
12 150 300
14 129 257
16 113 225
18 100 200
20 90 180
22 82 164
24 75 150
26 69 138
28 64 129
30 60 120
32 56 113
34 53 106
36 50 100
38 47 95
40 45 90
42 43 86
44 41 82
46 39 78
48 37 75
50 36 72
52 35 69
54 34 67
56 32 64
58 31 62
60 30 60

1. EXAMPLE: By actual measurement, it takes 38 seconds for the
hand on the 1-cubic foot dial to make a revolution with just a
100,000 BTUH furnace running. Using this information, locate
38 seconds in the first column of Table 19. Read across to the
column headed “1 Cubic Foot,” where you will see that 95 cubic
feet of gas per hour are consumed by th e furna ce at th at rate.
Multiply 95 x 1050 (the BTU rating of the gas obta ined from the
local gas company). The result is 99,750 BTUH, which is close
to the 100,000 BTUH rating of the furnac e.

Size of Test Dial

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

1

Unitary Products Group 27

Typical Wiring Diagrams

Typical DNX024 Cooling Unit with Single Stage Gas Heat 208/230-1-60 volt Wiring Diagram

279550-YIM-A-0207

28 Unitary Products Group

279550-YIM-A-0207

Typical DNX024 Cooling Unit with Two Stage Gas Heat 208/230-1-60 volt Wiring Diagram

Unitary Products Group 29

Typical DNX036-048 Cooling Unit with Single Stage Gas Heat 208/230-1-60 volt Wiring Diagram

279550-YIM-A-0207

30 Unitary Products Group

279550-YIM-A-0207

Typical DNX036-048 Cooling Unit with Two Stage Gas Heat 208/230-1-60 volt Wiring Diagram

Unitary Products Group 31

Typical DNX036-048 Cooling Unit with Single Stage Gas Heat 208/230-3-60 volt Wiring Diagram

279550-YIM-A-0207

32 Unitary Products Group

279550-YIM-A-0207

Typical DNX036-048 Cooling Unit with Two Stage Gas Heat 208/230-3-60 volt Wiring Diagram

Unitary Products Group 33

Typical DNX036-048 Cooling Unit with Single Stage Gas Heat 460-3-60 volt Wiring Diagram

279550-YIM-A-0207

34 Unitary Products Group

279550-YIM-A-0207

Typical DNX036-048 Cooling Unit with Two Stage Gas Heat 460-3-60 volt Wiring Diagram

Unitary Products Group 35

R-410A QUICK REFERENCE GUIDE

Refer to Installation Instructions for specific installation requirements.

R-410A Refrigerant operates at 50 - 70 percent higher pressures than R-22. Be sure that servicing
equipment and replacement components are designed to operate with R-410A.
R-410A Refrigerant cylinders are rose colored.
Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400, or DOT BW400.
Recovery equipment must be rated for R-410A.
Do Not use R-410A service equipment on R-22 systems. All hoses, gages, recovery cylinders, charging
cylinders and recovery equipment must be dedicated for use on R-410A systems only.
Manifold sets must be at least 700 psig high side, and 180 psig low side, with 550 psig retard.
All hoses must have a service pressure rating of 800 psig.
Leak detectors must be designed to detect HFC refrigerants.
Systems must be charged with liquid refrigerant. Use a commercial type metering device in the
manifold hose.
R-410A can only be used with POE type oils.
POE type oils rapidly absorb moisture from the atmosphere.
Vacuum pumps will not remove moisture from POE type oils.
Do not use liquid line driers with a rated working pressure rating less than 600 psig.
Do not install suction line driers in the liquid line.
A liquid line drier is required on every unit.
Do not use a R-22 TXV. If a TXV is to be used, it must be a R-410A TXV.
Never open system to atmosphere when under a vacuum.
If system must be opened for service, evacuate system then break the vacuum with dry nitrogen and
replace all filter driers.

Figure 20: R-410A Quick Reference Guide

Subject to change without notice. Printed in U.S.A. 279550-YIM-A-0207
Copyright © 2007 by Unitary Products Group. All rights reserved. Supersedes: 98811-YIM-C-1006

Unitary 5005 Norman
Products York OK
Group Drive 73069