York SUNLINE 2000 D3CE 036 User manual

GENERAL
YORK Model DCE units are single package air conditioners
designed for outdoor installation on a rooftop or a slab. Electric
heaters are available as field-installed accessories.
The units are completely assembled on rigid, permanently
attachedbaserails.Allpiping,refrigerant charge,andelectrical
wiring is factory-installed and tested. The units require only
electric power and duct connections at the point of installation.
The electric heaters have nickel-chrome elements and utilize
single point power connection.
INSPECTION
Assoonasaunitisreceived,itshouldbeinspectedforpossible
damage during transit. If damage is evident, the extent of the
damage should be noted on the carrier’s freight bill. Aseparate
request for inspection by the carrier’s agent should be made in
writing. See Local Distributor for additional information.
REFERENCE
Additionalinformationonthedesign,installation,operationand
service of this equipment is available in the following reference
forms:
•55.70-N1 - General Installation
•55.70-N2 - Pre-start & Post-start Check List
•530.18-N1.2V - Economizer Accessory
•530.18-N1.4V - Fixed Outdoor Air Damper Accessory
•530.18-N1.6V - Motorized Outdoor Air Damper Accy.
•530.18-N1.8V - Coil Guard
•530.18-N7.1V - Electric Heater Accessory
•530.18-N7.2V - Fuse Block Accessory
Renewal Parts:
•Refer to Parts Manual for complete listing of replacement
parts on this equipment.
All forms referenced in this instruction may be ordered from:
Publications Distribution Center
Unitary Products Group
P.O. Box 1592, York, PA 17405
®
SUNLINE 2000
ELECTRIC / ELECTRIC
SINGLE PACKAGE AIR CONDITIONERS
INSTALLATION INSTRUCTION Supersedes: Nothing 530.26-N1YI (994)
Installer should pay particular attention to the words: NOTE, CAUTION and WARNING . Notes are intended to clarify or
make the installation easier.Cautions are given to prevent equipment damage.Warnings are given to alert installer that per-
sonal injury and/or equipment damage may result if installation procedure is not handled properly.
035-12135
MODELS D3CE 036 & 048
MODEL D3CE 060 & 076 BELT DRIVE
(WORLD 50 HZ)
CAUTION
THE ENCLOSED INSTALLATION INSTRUCTIONS ANDANY APPLICABLE
LOCAL,STATE,AND NATIONAL CODES INCLUDING, BUT NOT LIMITED
TO,BUILDING, ELECTRICAL,AND MECHANICAL CODES.
THIS PRODUCT MUST BE INSTALLED IN STRICT COMPLIANCE WITH
WARNING
OPERATION OF THE PRODUCT COULD CAUSE PERSONAL INJURY
OR PROPERTY DAMAGE.
INCORRECT INSTALLATION MAY CREATE A CONDITION WHERE THE

General ................................................................................ 1
Inspection............................................................................. 1
Reference ............................................................................ 1
Nomenclature....................................................................... 2
INSTALLATION
Limitations............................................................................ 3
Location ............................................................................... 3
Rigging and Handling .......................................................... 3
Clearances........................................................................... 3
Ductwork.............................................................................. 3
Filters ................................................................................... 3
Condensate Drain................................................................ 4
Service Access..................................................................... 4
Thermostat........................................................................... 4
Power and Control Wiring.................................................... 4
Blower Speed Selection....................................................... 4
Compressors........................................................................ 4
Optional Economizer Rain Hood ......................................... 5
Disconnect Switch Bracket For Optional Belt-Drive............ 6
Electric Heaters.................................................................... 8
OPERATION
Cooling System.................................................................. 12
Preliminary Operation Cooling........................................... 12
Cooling Sequence of Operation ........................................ 12
Safety Controls .................................................................. 13
Heating Sequence of Operation ........................................ 13
Heat Anticipator Setpoints ................................................. 13
Checking Supply Airflow.................................................... 13
Secure Owner’s Approval.................................................. 14
MAINTENANCE
Normal Maintenance.......................................................... 14
TABLES
No. Description Page
1 Unit Application Data .................................. 3
2 Physical Data.............................................. 4
3 Blower Perf. - 036 & 048 w/Direct-Drive..... 9
4 Blower Perf. - 060 & 076 w/Belt-Drive........ 10
5 Static Resistances...................................... 12
6 Motor and Drive Data - Belt-Drive............. 12
7 Electrical Data -Basic Unit.......................... 12
8 Heat Anticipator Setting.............................. 13
9 Motor Pulley Adjustment............................. 13
FIGURES
No. Description Page
1 Center of Gravity......................................... 3
2 Recommended Drain Piping....................... 4
3 Economizer Rain Hood Assembly.............. 5
4 Typical Field Wiring..................................... 6
5 Dimensions and Clearances....................... 7
6 Enthalpy Setpoint Adjustment..................... 8
7 Press. Drop versus Supply Airflow ............. 14
TABLE OF CONTENTS
D 3 C E A
PRODUCT NOMENCLATURE
PRODUCT GENERATION
3 = 3rd Generation
PRODUCT CATEGORY
D = Single Package Air Conditioner
(Air Cooled)
PRODUCT IDENTIFIER
CE = Cooling
VOLTAGE CODE
50 = 380/415-3+N-50
036 = 10.5 kW (36 MBH)
048 = 14.0 kW (48 MBH)
060 = 17.6 kW (60 MBH)
076 = 22.3 kW (76 MBH)
70 6 5 0
NOMINAL COOLING
CAPACITY
FACTORY INSTALLED
HEAT
A= Cooling Only
530.26-N1YI
2Unitary Products Group

LIMITATIONS
These units must be installed in accordance with national and
local safety codes:
Refer to Table 1 for Unit Application Data.
If components are to be added to a unit to meet local codes, they
are to be installed at the dealer’s and/or the customer’s expense.
LOCATION
Use the following guidelines to select a suitable location for
these units.
1. Unit is designed for outdoor installation only.
2. Condenser must have an unlimited supply of air.
3. For ground level installation, use a level concrete slab with
a minimum thickness of 101mm (4 in.). The length and
width should be at least 152mm (6in.) greater than the unit
base rails. Do not tie slab to the building foundation.
4. Roof structures must be able to support the weight of theunit
and its options and/or 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 special
frameotherthanaYORKroofcurb,gasketingmust
be applied to all surfaces that come in contact with
the unit underside.
5. Maintain level tolerance to 13mm (1⁄2“) maximum across
the entire length or width of the unit.
6. Elevate the unit sufficiently to prevent any blockage of the
air entrances by snow in areas where there will be snow
accumulation. Check the local weather bureau for the
expected snow accumulation in your area.
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. Spreaders, whose length exceeds
the largest dimension across the unit, MUST be used across
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 provided for this purpose.
LENGTH OF FORKS MUST BE A MINIMUM OF 1067mm
(42").
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.
RefertoTable2forunitweightsandtoFigure1forapproximate
center of gravity.
CLEARANCES
All units require certain clearances for proper operation and
service. Refer to Figure 5 for the clearances required for
combustible construction, servicing, and proper unit operation.
WARNING:Do not permit overhanging structures or shrubs to
obstruct outdoor air discharge outlet.
DUCTWORK
A closed return duct system shall be used. This does not
preclude use of economizers or outdoor fresh air intake. The
supply and return air duct connections at the unit should be
made with flexible joints to minimize the transmission of noise.
The supply and return air duct systems should be designed for
theairflowandstatic requirementsofthejob.They shouldNOT
be sized to match the dimensions of the duct connections on
the unit.
CAUTION: When fastening ductwork to the side duct flanges
on the unit, insert the screws through the duct
flanges only. DO NOT insert the screws through
the casing.
Outdoor ductwork must be insulated and water-
proofed.
Refer to Figure 5 for information concerning side and bottom
supply and return air duct openings.
FILTERS
Each unit is supplied with 25mm (1 in.) filters. Modification of
the filter racks is not required to use 51mm (2 in.) replacement
filters. Filters must always be installed ahead of the evaporator
coil and must be kept clean or replaced with same size and
type. Dirty filters will reduce the capacity of the unit and will
result in frosted coils or safety shutdown. Minimum filter area
and required sizes are shown in Table 2.
INSTALLATION
Model DCE 036 048 060 076
Voltage Variation
Min. / Max. 380/415- 3-50 342 / 457
Supply Air m3/s/CFM, Nom. 0.57/1200 0.75/1600 0.94/2000 1.13/2400
Wet Bulb
Temperature of
Air on Evaporator
Coil, Min. / Max.
°C 14 / 22 14 / 22 14 /22 14 /222
°F 57 / 72 57 / 72 57 / 72 57 / 7
TABLE 1 - UNIT APPLICATION DATA
APPROXIMATE
CENTER OF
GRAVITY
FRONT
48-11/32
21
32-1/8 15-1/4
447⁄8“/1140mm
BACK
CONDENSER
COIL END
AB821⁄4“/2089mm
FIG. 1 - CENTER OF GRAVITY
DIM. 036 - 060 076
A19-3/4" / 502mm 22" / 559mm
B40-3/4"1035mm 44" / 1118mm
530.26-N1YI
Unitary Products Group 3

CONDENSATE DRAIN
Plumbing must conform to local codes. Use a sealing
compoundonmalepipethreads.Installacondensatedrainline
from the 19mm (3⁄4“) PVC female connection on the unit to spill
into an open drain.
NOTE: The condensate drain line MUST be trapped to pro-
vide proper drainage. See Figure 2.
SERVICE ACCESS
Access to all serviceable components is provided by the
following removable panels:
•Compressor compartment
•Heater compartment
•Blower compartment
•Main control box
•Filter compartment
•Motor Access (on units w/belt-drive option)
Refer to Figure 5 for location of these access panels.
CAUTION: Make sure that all screws are replaced on the
unit to maintain an air-tight seal.
THERMOSTAT
The room thermostat should be located on an inside wall
approximately 1422mm (56 in.) above the floorwhere it will not
be subject 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. See Figure 4 for wiring details.
NOTE: If the unit has an economizer, remove jumper J1
from terminals 8 and 10 on the relay board to pre-
vent simultaneous operation of the compressor and
the economizer. If you want to control the econo-
mizer on a second stage of cooling, use a thermo-
stat with two stages of cooling.
POWER AND CONTROL WIRING
Fieldwiringtotheunitmustconformtotheapplicablenationaland
local or municipal codes.
Voltage tolerances which must be maintained at the
compressor terminals during starting and running conditions
are indicated on the unit Rating Plate and Table 1.
Theinternalwiringharnessfurnishedwiththisunitisanintegral
part of the unit. Field alteration to comply with electrical codes
should not be required.
A fused disconnect switch should be field provided for the unit.
Theswitchmustbeseparatefromallothercircuits.RefertoFigure
5 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 lines must be sized properly to carry the load. USE
COPPER CONDUCTORS ONLY.Each unit mustbe wired with
a separate branch circuit fed directly from the meter panel and
properly protected.
CAUTION: When connecting electrical power and control
wiring to the unit, waterproof type connectors
MUST BE USED so that water or moisture can-
not be drawn into the unit during normal opera-
tion. The above waterproofing conditions will
also apply when installing a field-supplied discon-
nect switch.
Refer to Figure 4 for typical field wiring and to the appropriate
unit wiring diagram for control circuit and power wiring
information.
BLOWER SPEED SELECTION
Three blower motor speeds are available on the direct-drive
units. The speed selection for the direct-drive units is
determined by the CFM and ESP requirements of the
applications. All units with belt-drive option have an adjustable
motor pulley to achieve the above conditions.
COMPRESSORS
The compressor in the 036, 048 and 060 units is 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.
The 076 units are shipped with compressor mountings
factory-adjusted and ready for operation.
CAUTION: Do not loosen compressor mounting bolts.
76mm (3")
51mm (2")
FIG. 2 - RECOMMENDED DRAIN PIPING
WEIGHTS (kg/lbs)
Basic Unit
036 249 / 550
048 268 / 590
060 286 / 630
076 313 / 690
ACCESSORIES / OPTIONS
Electric Heat
(Nominal KW)
5 - 7 KW 8 / 18
10 - 15 KW 10 / 23
20 - 30 KW 13 / 28
Economizer 23 / 50
Motorized Outdoor
Air Damper 22 / 48
Relief/Fixed
Air Damper 5 / 10
Roof Mounting Curb 42 / 92
MODELS DCE
036 048 060 076
Evaporator
Blower
Centrifugal Blower (Dia. x Wd.
mm (in.))
Fan Motor HP (direct-drive)
Fan Motor HP (Belt-Drive)
305 x 254
(12 x 10)
1⁄2
N/A
305 x 254
(12 x 10)
3⁄4
N/A
305 x 254
(12 x 10)
N/A
1.5
305 x 279
(12 x 11)
N/A
1.5
Evaporator
Coil Rows Deep
Fins Per 25mm (1 in.)
Face Area (m2/ft2)
3
13
0.33 / 3.6
3
13
0.40 / 4.3
3
13
0.48 / 5.1
3
13
0.48 / 5.1
Condensor
Fan Propeller Dia. (mm/in.)
Fan Motor HP
Nom. CFM Total
610 / 24
1⁄2
4,500
610 / 24
1⁄2
4,500
610 / 24
1⁄2
4,500
610 / 24
1⁄2
4,500
Condensor
Coil Rows Deep
Fins Per 25mm (1 in.)
Face Area (ft2/m2)
1
16
1.60 / 17.1
1
19
11.60 / 17.1
1
22
1.60 / 17.1
2
16
1.55 / 16.7
Air
Filters
(SEE NOTE)
Quantity Per Unit (14" X 20" X 1")
Quantity Per Unit (14" X 25" X 1")
Total Face Area (m2/ft2)
2
1
0.59 / 6.3
2
1
0.59 / 6.3
2
1
0.59 / 6.3
2
1
0.59 / 6.3
Charge Refrigerant 22 (kg / lbs./oz.) 2.72 / 6/0 3 / 6/10 3.3 / 7/4 4.9 / 10/12
NOTE: Filter racks are adapted for 25mm (1 in.) or 51mm(2 in.) thick filters.
TABLE 2 - PHYSICAL DATA
530.26-N1YI
4Unitary Products Group

OPTIONAL ECONOMIZER RAIN HOOD
The following procedure should be used when assembling an
economizer rain hood onto a unit. Refer to Figure 3. The
outdoor and return air dampers, damper actuator, the linkage
and all the controls are factory mounted as part of the
economizer option.
All of the hood components, including the filters, the gasketing
and the hardware for assembling are located above the top
filter racks within the filter section. The outdoor air sensor is in
the bag of parts located at the bottom of the return air section.
1. With filter section access panel removed, take out hood
components, filters and sensor described above. Remove
and discard outdoor air opening cover on back unit (Upper
right hand corner).
2. Remove the 13mm (1⁄2in.) knockout (A) in the units rear
panel (located to the right side of the outdoor air opening).
Insert the two loose wires from inside the unit, into the
13mm (1⁄2in.) bushing provided. Insert wires and bushing
into knockout. Snap bushing into place.
3. Mount the outdoor air sensor to the rear panel, just below
the knockout described in Step 2. Secure with two
self-drilling screws at dimples (B) provided in the panel.
NOTE: Sensor must be positioned so that the sensing
ports are at the top (louvers pointing downward)
and terminal connections to the right.
4. Connect the two wires, indicated in Step 2, to the sensor
as follows:
•Wire #73 to terminal (+)
•Wire #74 to terminal (S)
5. Assemble the LH and RH side plates to the top cover
(2 screws each side) to form the hood. Apply gasketing to
the flange surface on each side plate. Extend gasketing
6mm(1⁄4in.)beyondtopandbottomofeachflangetoinsure
adequate corner sealing. Secure this assembly to the unit
back panel (upper right hand corner). First, remove screw
(C)onunittopcover.Thenslipflangeofhoodcoverinunder
flange of unit top cover, replace screw (C), engaging hole
(E) in hood flange and tighten. Attach the two side plates to
theunit panelby usingtwoself-drillingscrewsforeach side
plate at dimples (D) provided in the panel.
6. Position fillpiece at bottom of hood, between the two side
plates but do not secure at this time. (Slotted openings
MUSTbe downwardfor drainage).After fillpieceisproperly
positioned, note where contact is made with the unit panel.
Remove fillpiece and apply gasket material to this area to
provide a seal. Reposition fillpiece and secure with two
screws.
7. Install the two filters into the hood assembly, sliding down
along retainers on side plates, into fillpiece at bottom of
hood.
NOTE: Install filters so that “Air Flow” arrows point toward
the unit.
8. Install filter cover over the end of the hood with one screw
(center of hood), securing filters into position.
CAUTION: When proceeding with steps 9 and 10, extreme
care must be exercised while turning both the set
point and minimum position adjusting screws to
prevent twisting them off.
9. The enthalpy set point for the dampers may now be set by
selecting the desired set-point from graph in Figure 6. For
a single enthalpy economizer, carefully turn the set-point
adjusting screw to the “A”, “B”, “C” or “D” setting
corresponding to the lettered curve. For a dual enthalpy
economizer, carefully turn the set-point adjusting screw
fully clockwise past the “D” setting.
10. To check that the damper blades move smoothly without
binding, carefully turn the minimum position adjusting
screw fully clockwise and then energize and de-energize
terminals “R” to “G”. With terminals “R” to “G” energized,
turn the minimum position screw counterclockwise until the
desired minimum position has been attained.
11. Replace the filter section access panel.
BGASKET
C
HOOD
COVER OUTDOOR AIR
SENSOR
A
FILTER SECTION
ACCESS PANEL
D
GASKETED
FLANGE
R. H.
SIDE
PLATE
D
ED
D
GASKETED
FLANGE
FILTER
COVER
L. H. SIDE
PLATE
FILTERS
FILLPIECE
OUTDOOR AIR
OPENING COVER
SIDE DUCT
APPLICATION SHOWN
FIG. 3 - ECONOMIZER RAIN HOOD ASSEMBLY (OPTION)
530.26-N1YI
Unitary Products Group 5

DISCONNECT SWITCH BRACKET
FOR UNITS WITH BELT-DRIVE BLOWER
A special bracket for mounting a field-supplied disconnect
switch is provided in each unit ordered with an optional
belt-drive supply air blower. The bracket is shipped inside the
blower compartment taped to the top of the blower housing.
Install the bracket on the left hand side of the unit as shown in
Figure 5. Several existing screws at the top of the unit and one
screw approximately midway down from the top will be used
for mounting the bracket. Screws should be loosened only -
NOT REMOVED. Matching holes in the bracket have
elongated keyways allowing easy installation. Re-tighten
screws after bracket is in place to ensure panels will remain
leak tight.
FIG. 4 - TYPICAL FIELD WIRING
CONTROL WIRING
24 VOLT
TRANSFORMER
UNIT TERMINAL
STRIP TB1
THERMOSTAT1
TERMINALS
124 VOLT THERMOSTAT 2TH08701024. IF THE UNIT HAS AN ECONOMIZER,
REMOVE JUMPER J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD
TO PREVENT SIMULTANEOUS OPERATION OF THE COMPRESSOR AND
THE ECONOMIZER. IF YOU WANT TOCONTROLTHE ECONOMIZER ONA
SECOND STAGE OF COOLING, USE THERMOSTAT 2TH04701224.
COOLING ONLY (24 VOLT THERMOSTAT)
THERMOSTAT1
TERMINALS
UNIT TERMINAL
STRIP TB1
24 VOLT
TRANSFORMER
ADD
JUMPER
124 VOLT THERMOSTAT 2TH07701024. IF THE UNIT HAS AN ECONOMIZER,
REMOVE JUMPER J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD
TO PREVENT SIMULTANEOUS OPERATION OF THE COMPRESSOR AND
THE ECONOMIZER. IF YOU WANT TO CONTROLTHE ECONOMIZER ON A
SECOND STAGE OF COOLING OR HAVE AN ELECTRIC HEAT ACCESSORY
WITH TWO STAGES OF HEAT, USE THERMOSTAT 2TH04701024 OR
2TH04701524 (WITH SUBBASE 2TB04700224 OR 2TB04700324).
COOLING / HEATING (24 VOLT THERMOSTAT)
24 VOLT
TRANSFORMER
UNIT TERMINAL
STRIP TB1
THERMOSTAT1
TERMINALS
ADD
JUMPER
ADD
JUMPER
4
2
3
4
NOT
USED
TO REMOTE SENSOR
2TH04702224 IF USED
1ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET04700224 (INCLUDES SUBBASE)
TO CONTROL ECONOMIZER ON SECOND STAGE OF COOLING, REMOVE JUMPER
J1 FROM TERMINALS 8 AND 10 ON THE RELAY BOARD.
2SECOND STAGE COOLING IS NOT REQUIRED ON UNITS LESS ECONOMIZER.
3SECOND STAGE HEATING IS ONLY REQUIRED ON UNITS WITH ATWO STAGE
ELECTRIC HEATER.
4REMOVE JUMPER J2 FROM TERMINALS 4 AND 9 ON JUMPER PLUG CONNECTOR
P6 ON UNITS WITH ECONOMIZER. TERMINALS A1 AND A2 PROVIDE A RELAY
OUT-PUT TO CLOSE THE OUTDOOR ECONOMIZER DAMPERS WHEN THE
THERMOSTAT SWITCHES TO THE SET-BACK POSITION.
COOLING / HEATING (ELECTRONIC THERMOSTAT)
24 VOLT
TRANSFORMER
THERMOSTAT1
TERMINALS
ADD
JUMPER
UNIT TERMINAL
STRIP TB1
1ELECTRONIC PROGRAMMABLE THERMOSTAT 2ET07701024 (INCLUDES SUBBASE).
IF THIS UNIT HAS AN ECONOMIZER, REMOVE JUMPER J1 FROM TERMINALS 8AND
10 ON THE RELAY BOARD TO PREVENT SIMULTANEOUS OPERATION OF THE
COMPRESSOR AND THE ECONOMIZER. IF YOU WANT TO CONTROLTHE
ECONOMIZER ON ASECOND STAGE OF COOLING, USE THERMOSTAT 2ET04700224.
COOLING / HEATING (ELECTRONIC THERMOSTAT)
THREE
PHASE
POWER
SUPPLY
FIELD-SUPPLIED
DISCONNECT
GROUND LUG
CONTACTOR
NEUTRAL
TERMINAL
BLOCK
POWER WIRING
530.26-N1YI
6Unitary Products Group

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 air duct cover to gain
access to the bottom supply air knockout panel.
2. Remove and discard the bottom knockout panel.
3. Replace the side duct cover.
4. With filter section access panel removed from the
unit, remove and discard the bottom return air
knockout panel.
5. Replace the filter access panel.
FIG. 5 - DIMENSIONS & CLEARANCES - 036 - 076 UNITS
CLEARANCES (mm/in.)
Front 607/24
Back 305/12 (Less Economizer)
914/36 (With Economizer)
Left Side (Filter Access) 607/24 (Less Economizer)
914/36(With Economizer)
Right Side (Cond. Coil) 607/24
Below Unit120/0
Above Unit21829/72 (For Condenser Air
Discharge)
NOTE:
Units and ductwork are approved for zero clearance to combustible
materials when equipped with electric heaters.
1Units may be installed on combustible floors made from wood or
class A, B or C roof covering material. (Applicable in USA only).
2Units must be installed oudoors. Overhanging structures or shrubs
should not obstruct the outdoor coil nor the fan outlet.
HOLE KNOCKOUT SIZE
(DIA.), mm/in. USED FOR
A22 / 7⁄8* Control Wiring
(Side or
Bottom)**
B 51 / 2 ** Power Wiring (Side or
Bottom)
*Knockouts in the bottom of the unit can be located
by the slice in the insulation.
**Do not remove the 2" knockout ring.
UTILITIES ENTRY DATA
FILTER ACCESS
ELECTRIC
HEAT
ACCESS
B - POWER WIRING ENTRY
A, B
WIRING ENTRY
(See Detail “B”)
OUTDOOR
COIL
A - CONTROL WIRING ENTRY
3⁄4“ PVC FEMALE
COND. DRAIN
(See Detail ”A")
BOTTOM SUPPLY &
RETURN AIR OPENINGS
(SEE NOTE)
(829)
325⁄8
(445) 171⁄2
(292)
111⁄2
(200)
77⁄8
(171) 63⁄4(206) 81⁄8
(213) 83⁄8
(445)
171⁄2
(165) 61⁄2
(137)
53⁄8
(64)
21⁄2
(2089) 821⁄4
(1140) 447⁄8
(Direct-Drive Units)
FIELD-SUPPLIED
DISCONNECT SWITCH
LOCATION
BLOWER
ACCESS
CONTROL
BOXACCESS
Shown separately to illustrate bottom
duct openings and power connection
locations.
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
(19)
OPENING FOR
PRESSURE CHECK
OPENING FOR
PRESSURE CHECK
(495)
191⁄2
(699)
271⁄2
3⁄4“ CONDENSATE
DRAIN
(must be trapped)
(19)
(1140)
447⁄8
B
(416)
163⁄8
(260)
101⁄4
(260)
101⁄4
(121)
43⁄8
(121)
45⁄8
A
(89)
31⁄2
(210) 81⁄4
UNIT WITH FIXED OUTDOOR
AIR / BAROMETRIC RELIEF RAIN HOOD
DETAIL “B”
DETAIL “A”
UNIT WITH ECONOMIZER RAIN HOOD
AIR FLOW LEGEND
RETURNAIR
SUPPLY AIR
OUTDOOR AIR
OUTDOOR AIR
(Economizer)
UNIT BASE WITH RAILS
FRONT VIEW
All dimensions are in millimeters and inches.
They are subject to change without notice. Cer-
tified dimensions will be provided upon request.
(292)
111⁄2
(117)
45⁄8
(76)
3
(200)
77⁄8
(165)
61⁄2
(445)
171⁄2
(292)
111⁄2
(445)
171⁄2
(1140)
447⁄8
(502)
193⁄4
SIDE SUPPLY AND RETURN
AIR OPENINGS
REAR VIEW
530.26-N1YI
Unitary Products Group 7

ELECTRIC HEATERS
Electric heaters are available as field-installed accessories.
Refer to the accessory instruction for installation instructions.
These UL and CGA approved heaters are located within the
central compartment of the unit (see Figure 5 for access panel)
with the heating elements extending into the supply air
chamber.
The heaters are wired for a single point power supply. Power
supply need only bebrought into thesinglepointterminalblock
and thermostat wiring to the low voltage terminal strip located
in the upper portion of the unit control box.
Fuses are supplied, where required, by the factory. Some KW
sizes require fuses and others do not. Refer to the accessory
instruction for electrical data.
FIG. 6 - ENTHALPY SET POINT ADJUSTMENT
530.26-N1YI
8Unitary Products Group

MODEL
DCE MOTOR SPEED
Available External Static Pressure - IWG *
0.20 0.30 0.40 0.50 0.60
CFM Watts CFM Watts CFM Watts CFM Watts CFM Watts
036 HI - - - - 1699 825 1650 785 1570 755
MED 1684 800 1631 780 1582 750 1524 720 1410 690
LOW 1487 710 1464 690 1421 670 1367 650 1315 620
048 HI 1996 960 1933 936 1868 910 1795 880 1722 845
MED 1804 838 1765 810 1714 785 1650 765 1589 735
LOW 1681 760 1640 738 1604 715 1541 695 1490 670
D*CE 036 & 048 w/Direct-Drive Blower
@ 380/415 Volts - Side Duct Connections
CFM
MODEL
DCE MOTOR SPEED
Available External Static Pressure - Pa *
50 74 99 124 149
m3/s Watts m3/s Watts m3/s Watts m3/s Watts m3/s Watts
036 HI - - - - 0.80 825 0.78 785 0.74 755
MED 0.79 800 0.77 780 0.75 750 0.72 720 0.67 690
LOW 0.70 710 0.69 690 0.67 670 0.64 650 0.62 620
048 HI 0.94 960 0.91 936 0.88 910 0.85 880 0.81 845
MED 0.85 838 0.83 810 0.80 785 0.78 765 0.75 735
LOW 0.79 760 0.77 738 0.76 715 0.73 695 0.70 670
M3/S
TABLE 3 - SUPPLY AIR PERFORMANCE
MODEL
DCE MOTOR SPEED
Available External Static Pressure - Pa *
174 198 223 248
m3/s Watts m3/s Watts m3/s Watts m3/s Watts
036 HI 0.67 725 0.64 700 0.60 680 0.56 655
MED 0.62 650 0.59 630 0.59 610 0.52 590
LOW 0.59 605 0.56 590 0.55 570 0.48 545
048 HI 0.77 820 0.73 790 0.67 765 0.61 740
MED 0.71 705 0.66 675 0.61 645 0.56 625
LOW 0.67 645 0.63 620 0.58 595 0.53 575
MODEL
DCE MOTOR SPEED
Available External Static Pressure - IWG *
0.70 0.80 0.90 1.00
CFM Watts CFM Watts CFM Watts CFM Watts
036 HI 1430 725 1360 700 1280 680 1180 655
MED 1324 650 1260 630 1185 610 1100 590
LOW 1246 605 1185 590 1110 570 1020 545
048 HI 1635 820 1544 790 1419 765 1300 740
MED 1508 705 1407 675 1306 645 1195 625
LOW 1416 645 1337 620 1230 595 1120 575
530.26-N1YI
Unitary Products Group 9

@ 380/415 Volts - Side Duct Connections
TABLE 4 - SUPPLY AIR BLOWER PERFORMANCE
MODEL
DCG AIR FLOW M3/S
Available External Static Pressure - Pa*
50 74 99 124 149 174 198
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
060
1.18 1059 1560 1077 1590 1095 1630 1114 1650 1134 1660 1158 1685 - -
1.13 1032 1405 1054 1470 1074 1525 1094 1560 1116 1595 1140 1620 1167 1640
1.08 1005 1260 1024 1275 1049 1370 1069 1440 1090 1475 1116 1505 1142 1535
1.04 980 1160 1002 1170 1022 1190 1044 1250 1066 1350 1090 1410 1117 1440
0.99 930 1060 957 1070 983 1080 1010 1100 1039 1160 1064 1260 1092 1340
0.94 877 950 908 975 941 1000 976 1020 1009 1050 1040 1100 1070 1225
0.90 - - - - 894 885 940 940 980 980 1014 1020 1047 1095
0.85 - - - - 855 815 903 860 950 905 988 940 1022 970
0.80 - - - - - - 884 815 925 850 964 880 1001 910
0.75 - - - - - - 864 770 908 805 948 835 987 870
0.71--------882740926780965830
MODEL
DCG AIR FLOW M3/S
Available External Static Pressure - Pa*
223 248 273 298 322 347 372
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
060
1.18--------------
1.13--------------
1.08 1170 1580 - - ----------
1.04 1148 1480 1180 1530 ----------
0.99 1121 1385 1155 1425 ----------
0.94 1100 1285 1133 1340 1169 1385 --------
0.90 1079 1180 1110 1240 1143 1280 1178 1330 - - - - - -
0.85 1058 1060 1090 1135 1122 1190 1158 1240 - - - - - -
0.80 1035 960 1071 1030 1103 1100 1134 1140 1164 1175 - - - -
0.75 1020 900 1056 965 1088 1035 1118 1065 1145 1105 1170 1130 - -
0.71 1004 860 1038 880 1070 925 1101 980 1130 1045 1158 1075 - -
*INCLUDES ALLOWANCES FOR AWET EVAPORATOR COIL, 25mm (1in. ) FILTERS, AND GAS-FIRED HEAT EXCHANGERS.
MODEL
DCG AIR FLOW M3/S
Available External Static Pressure - Pa*
50 74 99 124 149 174 198
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
076
1.50 1150 2325 1182 2425 ----------
1.42 1100 2010 1129 2090 1157 2150 1185 2225 - - - - - -
132 1045 1700 1074 1780 1102 1850 1131 1940 1160 2025 1190 2075 - -
1.23 985 1425 1015 1475 1045 1540 1075 1630 1103 1715 1135 1760 1163 1825
1.13 930 1240 958 1300 990 1350 1020 1400 1051 1430 1081 1490 1111 1600
1.04 - - 905 1070 933 1160 965 1210 997 1250 1028 1285 1060 1325
0.94 - - - - - - 919 1025 950 1100 982 1130 1014 1160
0.85--------9099259391005 968 1030
MODEL
DCG AIR FLOW M3/S
Available External Static Pressure - Pa*
223 248 273 298 322 347 372
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
076
1.50--------------
1.42--------------
1.32--------------
1.23 1193 1920 - - ----------
1.13 1142 1675 1173 1730 ----------
1.04 1090 1380 1124 1450 1155 1550 1186 1640 - - - - - -
0.94 1045 1175 1077 1200 1109 1275 1140 1360 1170 1460 - - - -
0.85 998 1050 1028 1060 1058 1060 1087 1075 1118 1150 1148 1250 1176 1360
*INCLUDES ALLOWANCES FOR AWET EVAPORATOR COIL, 25mm (1") FILTERS, AND GAS-FIRED HEAT EXCHANGERS.
D*CE060 & 076 w/Belt-Drive Blower
M3/S
Continued on next page
530.26-N1YI
10 Unitary Products Group

@ 380/415 Volts - Side Duct Connections
MODEL
DCG AIR FLOW CFM
Available External Static Pressure - IWG*
0.20 0.30 0.40 0.50 0.60 0.70 0.80
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
060
2500 1059 1560 1077 1590 1095 1630 1114 1650 1134 1660 1158 1685 - -
2400 1032 1405 1054 1470 1074 1525 1094 1560 1116 1595 1140 1620 1167 1640
2300 1005 1260 1024 1275 1049 1370 1069 1440 1090 1475 1116 1505 1142 1535
2200 980 1160 1002 1170 1022 1190 1044 1250 1066 1350 1090 1410 1117 1440
2100 930 1060 957 1070 983 1080 1010 1100 1039 1160 1064 1260 1092 1340
2000 877 950 908 975 941 1000 976 1020 1009 1050 1040 1100 1070 1225
1900 - - - - 894 885 940 940 980 980 1014 1020 1047 1095
1800 - - - - 855 815 903 860 950 905 988 940 1022 970
1700 - - - - - - 884 815 925 850 964 880 1001 910
1600 - - - - - - 864 770 908 805 948 835 987 870
1500 - - - - ----882740926780965830
MODEL
DCG AIR FLOW CFM
Available External Static Pressure - IWG*
0.20 0.30 0.40 0.50 0.60 0.70 0.80
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
076
3200 1150 2325 1182 2425 ----------
3000 1100 2010 1129 2090 1157 2150 1185 2225 - - - - - -
2800 1045 1700 1074 1780 1102 1850 1131 1940 1160 2025 1190 2075 - -
2600 985 1425 1015 1475 1045 1540 1075 1630 1103 1715 1135 1760 1163 1825
2400 930 1240 958 1300 990 1350 1020 1400 1051 1430 1081 1490 1111 1600
2200 - - 905 1070 933 1160 965 1210 997 1250 1028 1285 1060 1325
2000 - - - - - - 919 1025 950 1100 982 1130 1014 1160
1800 - - - - ----9099259391005 968 1030
MODEL
DCG AIR FLOW CFM
Available External Static Pressure - IWG*
0.90 1.00 1.10 1.20 1.30 1.40 1.50
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
076
3200 - - - - ----------
3000 - - - - ----------
2800 - - - - ----------
2600 1193 1920 - - ----------
2400 1142 1675 1173 1730 ----------
2200 1090 1380 1124 1450 1155 1550 1186 1640 - - - - - -
2000 1045 1175 1077 1200 1109 1275 1140 1360 1170 1460 - - - -
1800 998 1050 1028 1060 1058 1060 1087 1075 1118 1150 1148 1250 1176 1360
*INCLUDES ALLOWANCES FOR AWET EVAPORATOR COIL, 25mm (1") FILTERS, AND GAS-FIRED HEAT EXCHANGERS.
MODEL
DCG AIR FLOW CFM
Available External Static Pressure - IWG*
0.90 1.00 1.10 1.20 1.30 1.40 1.50
RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts RPM Watts
060
2500 - - - - ----------
2400 - - - - ----------
2300 1170 1580 - - ----------
2200 1148 1480 1180 1530 ----------
2100 1121 1385 1155 1425 ----------
2000 1100 1285 1133 1340 1169 1385 --------
1900 1079 1180 1110 1240 1143 1280 1178 1330 - - - - - -
1800 1058 1060 1090 1135 1122 1190 1158 1240 - - - - - -
1700 1035 960 1071 1030 1103 1100 1134 1140 1164 1175 - - - -
1600 1020 900 1056 965 1088 1035 1118 1065 1145 1105 1170 1130 - -
1500 1004 860 1038 880 1070 925 1101 980 1130 1045 1158 1075 - -
*INCLUDES ALLOWANCES FOR AWET EVAPORATOR COIL, 25mm (1") FILTERS, AND GAS-FIRED HEAT EXCHANGERS.
TABLE 4 - SUPPLY AIR BLOWER PERFORMANCE D*CE060 & 076 w/Belt-Driven Blower (continued)
CFM
530.26-N1YI
Unitary Products Group 11

COOLING SYSTEM
The cooling section is a complete factory package utilizing an
air-cooled condenser. The system is factory-charged with
Refrigerant-22. The compressor is hermetically sealed and
internally sprung.
The compressors have inherent (internal) protection. If there is
an abnormal temperature rise in the compressor, the protector
opens to shut down the compressor.
PRELIMINARY OPERATION COOLING
Aftertheinstallationhasbeencompleted,thecrankcaseheater
of the compressor must be energized for at least four hours
before starting the unit. After this initial warm-up, the
compressor should be given three false starts (energized just
longenoughtomake afewrevolutions)withafiveminutedelay
between each start before being put into full time service.
NOTE: Prior to each cooling season, the crankcase heater
must be energized at least 10 hours before the system
is put into operation.
COOLING SEQUENCE OF OPERATION
Single-Stage Cooling:
Whenthethermostatcallsfor“cooling”,“R” isclosedto“G”and
“Y1" (wiring schematic) which completes the low voltage
control circuit, immediately energizing the compressors,
condenser fan motor and blower motor simultaneously.
EXTERNAL STATIC PRESSURE DROP
DESCRIPTION RESISTANCE, PA M3/S
0.47 0.57 0.66 0.75 0.85 0.94 1.03 1.13 1.23 1.32 1.42
Economizer/Motorized Damper1, 3 17.4 20.0 22.3 27.3 32.2 37.2 42.2 49.6 57.0 64.5 74.4
Electric Heaters15 - 15 KW 10.0 12.4 15.0 17.4 20.0 24.8 29.8 34.7 39.7 47.1 54.6
20 - 30 KW 15.0 17.4 20.0 22.3 27.3 32.2 37.2 42.2 49.6 57.0 64.5
Bottom Duct Connections115.0 17.4 20.0 22.3 24.8 27.3 29.8 34.7 39.7 47.1 54.6
Cooling Only220.0 24.8 29.8 34.7 39.7 44.6 49.6 57.0 64.5 71.9 79.4
DESCRIPTION RESISTANCE, IWG CFM
1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000
Economizer/Motorized Damper1, 3 0.07 0.08 0.09 0.11 0.13 0.15 0.17 0.20 0.23 0.26 0.30
Electric Heaters15 - 15 KW 0.04 0.05 0.06 0.07 0.08 0.10 0.12 0.14 0.16 0.19 0.22
20 - 30 KW 0.06 0.07 0.08 0.09 0.11 0.13 0.15 0.17 0.20 0.23 0.26
Bottom Duct Connections10.06 0.07 0.08 0.09 0.10 0.11 0.12 0.14 0.16 0.19 0.22
Cooling Only20.08 0.10 0.12 0.14 0.16 0.18 0.20 0.23 0.26 0.29 0.32
1Deduct these resistance values from the available external static pressure shown in the Blower Performance Table.
2Add these resistance values to the available static resistance in the Blower Performance Table.
3The pressure thru the economizer is greater for 100% outdoor air than for 100% return air. If the resistance of the return air duct system is less than 62 Pa (0.25 IWG), the unit will deliver less
airflow during full economizer operation.
TABLE 5 - STATIC RESISTANCES
MODEL BLOWER RANGE
(RPM)
MOTOR* ADJUSTABLE
MOTOR PULLEY FIXED BLOWER PULLEY BELT
HP RPM FRAME
SIZE SERVICE FACTOR PITCH DIA. BORE PITCH DIA. BORE PITCH LENGTH DESIG- NATION
mm in. mm in. mm in. mm in. mm in.
DCE 060 850 - 1180 11⁄21450 56 1.15 69 - 97 2.8 - 3.8 22 7⁄8127 5.0 25 1 947 37.3 A36
DCE 076 900 - 1200 11⁄21450 56 1.15 86 - 112 3.4 - 4.4 22 7⁄8132 5.2 25 1 973 38.3 A37
*All motors have solid bases and are inherently protected. These motors can be selected to operate into their service factor because they are located in the moving air, upstream of any
heating device.
TABLE 6 - MOTOR AND DRIVE DATA - Belt-Drive Blower
MODEL
DCE POWER SUPPLY
VOLTAGE
LIMITATIONS1COMPRESSOR COND.
FAN
MOTOR
FLA
SUPPLY
AIR
BLOWER
MOTOR
FLA
TOTAL
UNIT
AMPACITY
AMPS
MAX.
FUSE
SIZE
AMPS2
MAX.
HACR
BREAKER
SIZE
AMPS
MIN.
WIRE
SIZE,
AWG3
MIN. MAX. FLA LRA
036 380/415-3+N-50 342 457 7.1 64 1.8 2.0 12.6 15 15 14
048 380/415-3+N-50 342 457 9.6 73 1.8 4.0 17.8 25 25 10
060 380/415-3+N-50 342 457 10.3 74 1.8 2.6 17.2 25 25 10
076 380/415-3+N-50 342 457 14.1 128 1.8 2.6 22.0 35 35 8
1Utilization Range “A” in accordance with ARI Standard 110.
2Dual element, time delay type.
3 Based on 60°C copper conductors.
TABLE 7 - ELECTRICAL DATA (BASIC UNIT)
OPERATION
530.26-N1YI
12 Unitary Products Group

Two-Stage Cooling:
Atwo-stage cooling thermostat may be used if the unit has an
economizer. First-stage cooling is provided by the economizer
if the outdoor air enthalpy is acceptable, and second-stage
cooling is provided by the compressor. Jumper wire J1 must
be removed. Refer to unit wiring diagram.
After the thermostat is satisfied and opens, the blower
continues to run for a short time. All other components stop.
SAFETY CONTROLS
The refrigerant system is equipped with the following safety
controls:
1. ASuctionLine Freezestat toprotect againstlowevaporator
temperatures due to a low air flow or a low return air
temperature.
2. AHighPressureCutoutSwitchtoprotectagainstexcessive
discharge pressures due to a blocked condenser coil or a
condenser motor failure.
3. ALowPressureSwitchto protect against loss of refrigerant
charge.
Ifanyoftheabovesafetycontrolsopens,therefrigerantsystem
is locked out. The lock out of the system can be reset by
opening the 24V circuit either at the room thermostat or at the
unit disconnect.
HEATING SEQUENCE OF OPERATION
The following sequence of operation is based on using a
standard single-stage or two-stage heating thermostat.
WITH POWER TO UNIT AND THERMOSTAT IN THE
HEATING MODE
Single-Stage Heating:
a. If the fan switch is in the “ON” position, the evaporator
blower motor relay (BR) will be energized through terminal
G to provide continuous blower operation. If the fan switch
is in the “AUTO” position, the blower operates only when
there is a call for heating by the thermostat.
b. Uponacall for heatbythethermostat,thefirststageofheat
isenergized.Sequencer 1S(orcontactor 2M) is always the
firstandlasttocompleteitstimingcycleandcontrolspower
to the evaporator blower motor.
c. The thermostat cycles the electric heat to satisfy the heat-
ing requirements of the conditioned space.
Two-Stage Heating:
a. If the fan switch is in the “ON” position, the evaporator
blower motor relay (BR) is energized through terminal G
to provide continuous blower operation. If the fan switch is
inthe“AUTO”position,thebloweroperatesonlywhenthere
is a call for heating by the thermostat.
b. Upon a call for first-stage heat by the thermostat, the first
stage of heat is energized.
If the thermostat calls for the second stage of heat, the
second stage of heat is energized.
As before, sequencer 1S (or contactor 2M) maintains
control of the evaporator blower.
c. The thermostat cycles the electric heat to satisfy the
heating requirements of the conditioned space.
CONTINUOUS BLOWER - Continuous blower operation is
possible by closing the R to G circuit on the thermostat.
HEAT ANTICIPATOR SETPOINTS
It is important that the anticipator setpoint be correct. Too high
a setting results in longer heat cycles and a greater
temperature swing in the conditioned space. Reducing the
value below the correct setpoint causes shorter “ON” cycles
and may result in the lowering of the temperature within the
conditioned space. Refer to Table 8 for the required heat
anticipator setting.
CHECKING SUPPLY AIRFLOW
The speed of the supply air blower depends on the required
airflow, the unit accessories and the static resistances of both
the supply and the return air duct systems. With this
information, the speed for the supply air blower can be
determined from the static resistance and blower performance
data on Tables 3, 4 and 5.
Knowing the required blower RPM and the blower motor HP,
the speed setting for the direct-drive supply air motor can be
determined.
The setting (turns open) for the optional belt-drive supply air
motor pulley can be determined from Table 9.
OPTIONAL BELT-DRIVE BLOWER
All units with belt-drive blowers have single-speed motors.The
variable pitch pulley on the blower motor can be adjusted to
obtainthe desired supplyair airflow. Referto Table6for blower
motor and drive data.
Startthe supplyair blowermotor.Adjust theresistancesinboth
the supply and the return air duct systems to balance the air
distribution throughout the conditioned space. The job
specifications may require that this balancing be done by
someone other than the equipment installer.
To check the supply airflow after the initial balancing has been
completed:
1. Removethedotplugsfromtheholesinthefilteraccessand
blower access panels. See Figure 5 for location of plugs.
2. Insertatleast203mm(8in.)of6mm(1⁄4in.)tubingintoeach
of these holes for sufficient penetration into the air flow on
both sides of the evaporator coil.
NOMINAL
HEATER
SIZE
KW VOLTAGE SETTING, AMPS
TH1 TH2
7
10
15
20
30
380/415-3-50
0.35
0.35
0.35
0.37
0.37
-
-
-
0.29
0.29
TABLE 8 - HEAT ANTICIPATOR SETTING
TURNS OPEN* BLOWER DRIVE RANGE (RPM)
MODEL 060 MODEL 076
5 850 900
4 916 960
3 982 1020
2 1048 1080
1 1114 1140
0 1180 1200
*Pulley can be adjusted in half-turn increments.
TABLE 9 - BELT-DRIVE SUPPLY AIR
MOTOR PULLEY ADJUSTMENT
530.26-N1YI
Unitary Products Group 13

NOTE: The tubes must be inserted and held in a position
perpendicular to the air flow so that velocity pres-
sure does not affect the static pressure readings.
3. Using an inclined manometer, determine the pressure drop
across a dry indoor coil. Since the moisture on an indoor
coil may vary greatly, measuring the pressure drop across
a wet coil under field conditions would be inaccurate. To
assure a dry coil, the compressors should be de-energized
while the test is being run.
4. Knowing the pressure drop across a dry coil, the actual
airflow through the unit can be determined from the curve
in Figure 7.
WARNING:Failure to properly adjust thetotal system air quan-
tity can result in poor system performance.
After readings have been obtained, remove the tubes and
replacethedotplugsinthesidepanels.Eightmillimeter(5/16")
dot plugs (P/N 029-13880) are available through normal parts
ordering procedures.
NOTE: DE-ENERGIZE THE COMPRESSORS BEFORE
TAKING ANY TEST MEASUREMENTS TO ASSURE
A DRY INDOOR COIL.
0.6
0.4
811 14 17 20 23 26
DCE036
0.5
0.3
0.2
0.1
0.0
DCE048 DCE060,076
NOMINAL CFM (HUNDREDS)
PRESSURE DROP (IWG)
149
124
99
74
50
25
0
NOMINAL M3/S
0.38 0.52 0.66 0.80 0.94 1.08 1.23
PRESSURE DROP (PA)
FIG. 7 - PRESSURE DROP ACROSS ADRY
EVAPORATOR COIL VS SUPPLY AIRFLOW
SECURE OWNER’S APPROVAL: When the system is functioning properly, secure the owner’s approval. Show him
the location of all disconnect switches and the thermostat. Teach him how to start and stop the unit and how to adjust tem-
perature settings within the limitations of the system.
MAINTENANCE
NORMAL MAINTENANCE
WARNING:Prior to any of the following maintenance proce-
dures, shut off all power to the unit to prevent
personal injury.
FILTERS - Inspect once a month. Replace disposable or clean
permanent type as necessary. DO NOT replace permanent
type with disposable filters.
MOTORS-Indoorfan andoutdoorfanmotors arepermanently
lubricated and require no maintenance.
OUTDOOR COIL - Dirt should not be allowed to accumulate
on the outdoor coil surface or other parts in the air circuit.
Cleaning should be as often as necessary to keep coil clean.
Use a brush, vacuum cleaner attachment, or other suitable
means. If water is used to clean coil, be sure power to the unit
is shut off prior to cleaning.
NOTE: Exercise care when cleaning the coil so that the coil
fins are not damaged.
Do not permit the outdoor air discharge to be obstructed by
overhanging structures or shrubs.
530.26-N1YI
14 Unitary Products Group

530.26-N1YI
Unitary Products Group 15

P.O. Box 1592, York, Pennsylvania USA 17405-1592
Subject to change without notice. Printed in U.S.A
Copyright  by York International Corporation 1994 All Rights Reserved. 530.26-N1YI