704D----A
LEGACYt 13 SEER SINGLE--PACKAGED AIR CONDITIONER SYSTEM
WITH PURON (R--410A) REFRIGERANT
SINGLE AND THREE PHASE
2--5 NOMINAL TONS (SIZES 24--60)
Installation Instructions
NOTE: Read the entire instruction manual before starting the
installation.
NOTE: Installer: Make sure the Owner’s Manual and Service
Instructions are left with the unit after installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 1.........................
INTRODUCTION 2...................................
RECEIVING AND INSTALLA TION 2--10.................
Check Equipment 2..................................
Identify Unit 2....................................
Inspect Shipment 2.................................
Provide Unit Support 2...............................
Roof Curb 2......................................
Slab Mount 2.....................................
Provide Clearances 2.................................
Field Fabricate Ductwork 2............................
Rig and Place Unit 6.................................
Inspection 6......................................
Rigging/Lifting of Unit 7............................
Connect Condensate Drain 7...........................
Install Duct Connections 7.............................
Configuring Units for Downflow (Vertical) Discharge 7....
Install Electrical Connections 8.........................
High--Voltage Connections 9.........................
Special Procedures for 208v Operation 9................
Control Voltage Connections 9........................
Standard Connection 10.............................
Transformer Protection 10...........................
PRE-- S TART--UP 11...................................
START--UP 11--13.....................................
Check for Refrigerant Leaks 11.........................
Start--Up Adjustments 11..............................
Checking Cooling Control Operation 11................
Checking and Adjusting Refrigerant Charge 11...........
Indoor Airflow and Airflow Adjustments 12.............
Single Cooling Fan Speed Set--up 12...................
Two Cooling Fan Speeds Set-- up 12....................
Continuous Fan Operation 13........................
Cooling Sequence of Operation 13.....................
MAINTENANCE 22--24................................
Air Filter 22......................................
Indoor Blower and Motor 22.........................
Outdoor Coil, Indoor Coil, and Condensate Drain Pan 23...
Outdoor Fan 23...................................
Electrical Controls and Wiring 23.....................
Refrigerant Circuit 24...............................
Evaporator Airflow 24..............................
Puron Items 24....................................
TROUBLESHOOTING 25..............................
START--UP CHECKLIST 25............................
VERTICAL ECONOMIZER 29--47.......................
General 29.........................................
Accessories 29......................................
Installation 29--35...................................
Small Chassis 29--30...............................
Large Chassis 33--35...............................
CONFIGURATION 36--45..............................
OPERATION 46......................................
TROUBLESHOOTING 47..............................
SAFETY CONSIDERATIONS
Installation and servicing of this equipment can be hazardous due
to mechanical and electrical components. Only trained and
qualified personnel should install, repair, or service this equipment.
Untrained personnel can perform basic maintenance functions such
as cleaning and replacing air filters. All other operations must be
performed by trained service personnel. When working on this
equipment, observe precautions in the literature, on tags, and on
labels attached to or shipped with the unit and other safety
precautions that may apply.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in
literature and attached to the unit. Consult local building codes, the
current editions of the National Electrical Code (NEC) NFPA 70.
In Canada refer to the current editions of the Canadian Electrical
Code CSA C22.1.
Recognize safety information. This is the safety--alert symbol
When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand these
signal words: DANGER, WARNING, and CAUTION. These
words are used with the safety--alert symbol. DANGER identifies
the most serious hazards which will result in severe personal injury
or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will
result in enhanced installation, reliability, or operation.
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing or servicing system, always turn off main
power to system and install lockout tag. There may be
more than one disconnect switch. Turn off accessory heater
power switch if applicable.
A09034
Fig. 1 -- Unit 704D----A
.
WARNING
1
!
WARNING
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to relieve system pressure could result in personal
injury and/or death.
1. Relieve pressure and recover all refrigerant before
servicing existing equipment, and before final unit disposal.
Use all service ports and open all flow-- control devices,
including solenoid valves.
2. Federal regulations require that you do not vent
refrigerant into the atmosphere. Recover during system
repair or final unit disposal.
INTRODUCTION
The 704D----A packaged air conditioner is fully self--contained and
designed for outdoor installation (See Fig. 1). See Fig. 2 and 3 for
unit dimensions. All unit sizes have discharge openings for both
horizontal and downflow configurations, and are factory shipped
704D-- --A
with all downflow duct openings covered. The unit may be
installed either on a rooftop or on a ground-- level cement slab. (See
Fig. 4 for roof curb dimensions.)
RECEIVING AND INSTALLATION
Step 1 — Check Equipment
IDENTIFY UNIT
The unit model number and serial number are printed on the unit
informative plate. Check this information against shipping papers.
INSPECT SHIPMENT
Inspect for shipping damage before removing packaging materials.
If unit appears to be damaged or is torn loose from its anchorage,
have it examined by transportation inspectors before removal.
Forward claim papers directly to transportation company.
Manufacturer is not responsible for any damage incurred in transit.
Check all items against shipping list. Immediately notify the
nearest equipment distribution office if any item is missing. To
prevent loss or damage, leave all parts in original packages until
installation.
If the unit is to be mounted on a curb in a downflow application,
review Step 7 to determine which method is to be used to remove
the downflow panels before rigging and lifting into place. The
panel removal process may require the unit to be on the ground.
Step 2 — Provide Unit Support
IMPORTANT: The unit must be secured to the curb by installing
screws through the bottom of the curb flange and into the unit base
rails. When installing large base units onto the common curb, the
screws must be installed before allowing the full weight of the unit
to rest on the curb. A minimum of six screws are required for large
base units. Failure to secure unit properly could result in an
unstable unit. See Warning near Rigging/Lifting information and
accessory curb instructions for more details.
For hurricane tie downs, contact distributor for details and PE
(Professional Engineering) Certificate if required.
ROOF CURB
Install accessory roof curb in accordance with instructions shipped
with curb (See Fig. 4). Install insulation, cant strips, roofing, and
flashing. Ductwork must be attached to curb.
IMPORTANT: The gasketing of the unit to the roof curb is
critical for a water tight seal. Install gasketing material supplied
with the roof curb. Improperly applied gasketing also can result in
air leaks and poor unit performance.
Curb should be level to within 1/4 in. (6.35 mm) (See Fig. 6). This
is necessary for unit drain to function properly. Refer to accessory
roof curb installation instructions for additional information as
required.
Installation on older “G” series roof curbs.
Two accessory kits are available to aid in installing a new “G”
series unit on an old “G” roof curb.
1. Accessory kit number CPADCURB001A00, (small chassis)
and accessory kit number CPADCURB002A00, (large
chassis) includes roof curb adapter and gaskets for the
perimeter seal and duct openings. No additional
modifications to the curb are required when using this kit.
2. An alternative to the adapter curb is to modify the existing
curb by removing the outer horizontal flange and use
accessory kit number CPGSKTKIT001A00 which includes
spacer blocks (for easy alignment to existing curb) and
gaskets for the perimeter seal and duct openings. This kit is
used when existing curb is modified by removing outer
horizontal flange.
!
UNIT/STRUCTURAL DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Ensure there is sufficient clearance for saw blade when cutting
the outer horizontal flange of the roof curb so there is no
damage to the roof or flashing.
CAUTION
SLAB MOUNT
Place the unit on a solid, level concrete pad that is a minimum of 4
in. (102 mm) thick with 2 in. (51 mm) above grade. The slab
should extend approximately 2 in. (51 mm) beyond the casing on
all 4 sides of the unit (See Fig. 7). Do not secure the unit to the slab
except when required by local codes.
Step 3 — Provide Clearances
The required minimum service clearances are shown in Fig. 2 and
3. Adequate ventilation and outdoor air must be provided. The
outdoor fan draws air through the outdoor coil and discharges it
through the top fan grille. Be sure that the fan discharge does not
recirculate to the outdoor coil. Do not locate the unit in either a
corner or under an overhead obstruction. The minimum clearance
under a partial overhang (such as a normal house overhang) is 48
in. (1219 mm) above the unit top. The maximum horizontal
extension of a partial overhang must not exceed 48 in. (1219 mm)
IMPORTANT: Do not restrict outdoor airflow. An air restriction
at either the outdoor-- air inlet or the fan discharge may be
detrimental to compressor life.
Do not place the unit where water, ice, or snow from an overhang
or roof will damage or flood the unit. Do not install the unit on
carpeting or other combustible materials. Slab--mounted units
should be at least 4 in. (102 mm) above the highest expected water
and runoff levels. Do not use unit if it has been under water.
Step 4 — Field--Fabricate Ductwork
Secure all ducts to roof curb and building structure on vertical
discharge units. Do not connect ductwork to unit. For horizontal
applications, unit is provided with flanges on the horizontal
openings. All ductwork should be secured to the flanges. Insulate
and weatherproof all external ductwork, joints, and roof openings
with counter flashing and mastic in accordance with applicable
codes.
2
704D-- --A
A09467
Fig. 2 -- 704D ----A24--36 Unit Dimensions
3
704D-- --A
A09468
Fig. 3 -- 704D ----A42--60 Unit Dimensions
4
HVAC unit
base rails
Anchor screw
Flashing field
supplied
Roofing material
field supplied
Cant strip
field supplied
HVAC unit
basepan
Sealing
Gasket
Roofcurb
Wood nailer*
Roofcurb*
Insulation
(field supplied)
B
G
C
F
A
H
D
Dashed lines show cross support
location for large basepan units.
E
A09413
704D-- --A
*Provided with roofcurb
ROOF CURB DETAIL
SMALL/COMMON CURB
A09090
B
C
G
SUPPLY
AIR
SMALL
BASE
UNIT
H
A
F
RETURN
E
AIR
LARGE
BASE
UNIT
D
UNIT PLACEMENT ON
LARGE CURB
A09415
COMMON CURB
SMALL OR LARGE BASE UNIT
A09094
UNIT
SIZE
Small
or
Large
CATALOG
NUMBER
CPRFCURB010A00
CPRFCURB011A00
CPRFCURB012A00
Large
CPRFCURB013A00
* Part Numbers CPRCURB010A00 and CPRCURB011A00 can be u sed on both small and large basepan units. The cross supports must be located based on
whether the unit is a small basepan or a large basepan.
NOTES:
1. Roof curb must be set up for unit being installed.
2. Seal strip must be applied, as required, to unit being installed.
3. Roof curb is made of 16--gauge steel.
4. Attach ductwork to curb (flanges of duct rest on curb).
5. Insulated panels: 1--in. (25.4 mm) thick fiberglass 1 lb. density.
A
IN.
(mm)
11
(279)
14
(356)
11
(279)
14
(356)
B
(small/common
base)
IN. (mm)*
10 (254)
14 (356)
Fig. 4 -- Roof Curb Dimensions
B
(large base)
IN. (mm)*
14 (356)
A09414
C
IN.
(mm)
16
(406)
D
IN.
(mm)
47.8
(1214)
E
IN.
(mm)
32.4
(822)
43.9
(1116)
F
IN.
(mm)
2.7 (69)
G
IN. (mm)HIN. (mm)
30.6 (778)
46.1 (1170)
42.2 (1072)
5
CAUTION - NOTICE TO RIGGERS
A
PRUDENCE - AVIS AUX MANIPULATEUR
PANNEAUX D'ACCES DOIT ÊTRE EN PLACE POUR MANIPULATION.
Use top skid as spreader bar. / Utiliser la palette du haut comme barre de répartition
ACCESS PANELS MUST BE IN PLACE WHEN RIGGING.
DUCTS
MINIMUM HEIGHT: 36" (914.4 mm)
HAUTEUR MINIMUM
UNIT HEIGHT
HAUTEUR D'UNITÉ
SEAL STRIP MUST BE IN
PLACE BEFORE PLACING
UNIT ON ROOF CURB
BANDE SCELLANT DOIT ÊTRE
EN PLACE AVANT DE PLACER
L'UNITÉ SUR LA BASE DE TOIT
704D-- --A
DETAIL A
SEE DETAIL A
VOIR DÉTAIL A
SMALL CABINET LARGE CABINET
Unit*
Rigging
Weight
* For 460 volt units, add 14 lb (6.35 kg) to the rigging weight.
NOTE: See dimensional drawing for corner weights.
24 30 36
lb kg lb kg lb kg lb kg lb kg lb kg
279 127 284 129 290 132
VOIR DÉTAIL A
Unit*
Rigging
Weight
50CY502286 2.0
A09051
42 48 60
378 171 384 174 406 184
Fig. 5 -- 704D ----A Unit Suggested Rigging
Ducts passing through an unconditioned space must be insulated
and covered with a vapor barrier. If a plenum return is used on a
vertical unit, the return should be ducted through the roof deck to
attention should be paid to excessive wear at hoist hooking points
and load support areas. Materials showing any kind of wear in
these areas must not be used and should be discarded.
comply with applicable fire codes. See unit rating plate for any
required clearances around ductwork. Cabinet return--air static
shall not exceed -- .25 IN. W.C.
Step 5 — Rig and Place Unit
Rigging and handling of this equipment can be hazardous for
many reasons due to the installation location (roofs, elevated
structures, etc.).
Only trained, qualified crane operators and ground support staff
should handle and install this equipment.
When working with this equipment, observe precautions in the
literature, on tags, stickers, and labels attached to the equipment,
B
A-B
(6.35)
1/4
and any other safety precautions that might apply.
Training for operators of the lifting equipment should include, but
Fig. 6 -- Unit Leveling Tolerances
not be limited to, the following:
1. Application of the lifter to the load, and adjustment of the
!
WARNING
lifts to adapt to various sizes or kinds of loads.
2. Instruction in any special operation or precaution.
3. Condition of the load as it relates to operation of the lifting
kit, such as balance, temperature, etc.
Follow all applicable safety codes. Wear safety shoes and work
UNIT FALLING HAZARD
Failure to follow this warning could result in personal
injury or death.
Never stand beneath rigged units or lift over people.
gloves.
INSPECTION
Prior to initial use, and at monthly intervals, all rigging shackles,
clevis pins, and straps should be visually inspected for any damage,
evidence of wear, structural deformation, or cracks. Particular
1. Leave top shipping skid on the unit for use as a spreader bar
to prevent the rigging straps from damaging the unit. If the
skid is not available, use a spreader bar of sufficient length
to protect the unit from damage.
C
MAXIMUM ALLOWABLE
DIFFERENCE in. (mm)
B-C
(6.35)
1/4
1/4
A-C
(6.35)
A07925
6
!
WARNING
PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in personal
When straps are taut, the clevis should be a minimum of 36
in. (914 mm) above the unit top cover.
Rigging/Lifting of Unit (See Fig. 5)
!
WARNING
UNIT FALLING HAZARD
Failure to follow this warning could result in personal
injury or death.
Large base units must be secured to common curb before
allowing full weight of unit to rest on curb. Install screws
through curb into unit base rails while rigging crane is still
supporting unit.
Lifting holes are provided in base rails as shown.
1. Attach shackles, clevis pins, and straps to the base rails of
the unit. Be sure materials are rated to hold the weight of the
unit (See Fig. 5).
2. Attach a clevis of sufficient strength in the middle of the
straps. Adjust the clevis location to ensure unit is lifted level
with the ground.
After the unit is placed on the roof curb or mounting pad, remove
the top skid.
2˝
(50.8mm)
OPTIONAL
RETURN
AIR
OPENING
EVAP. COIL COND. COIL
Fig. 7 -- Slab Mounting Detail
OPTIONAL
SUPPLY
AIR
OPENING
A07926
Step 6 — Connect Condensate Drain
NOTE: When installing condensate drain connection be sure to
comply with local codes and restrictions.
Model 704D ----A disposes of condensate water through a 3/4 in.
NPT fitting which exits through the base on the evaporator coil
access side. See Fig. 2 and 3 for location.
Condensate water can be drained directly onto the roof in rooftop
installations (where permitted) or onto a gravel apron in ground
level installations. Install a field--supplied 2 --in. (51 mm)
condensate trap at end of condensate connection to ensure proper
drainage. Make sure that the outlet of the trap is at least 1 in. (25
mm) lower than the drain pan condensate connection to prevent the
pan from overflowing (See Fig. 8). When using a gravel apron,
make sure it slopes away from the unit.
Connect a drain tube using a minimum of 3/4 --in. PVC or 3/4 --in.
copper pipe (all field--supplied) at the outlet end of the 2-- in. (51
mm) trap. Do not undersize the tube. Pitch the drain tube
downward at a slope of at least 1--in. (25 mm) for every 10 ft (3.1
m) of horizontal run. Be sure to check the drain tube for leaks.
Prime trap at the beginning of the cooling season start--up.
TRAP
OUTLET
1-in. (25 mm) min.
2-in. (51 mm) min.
A09052
Fig. 8 -- Condensate Trap
Step 7 — Install Duct Connections
The design and installation of the duct system must be in
accordance with the standards of the NFPA for installation of
non--residence type air conditioning and ventilating systems,
NFPA 90A or residence type, NFPA 90B and/or local codes and
ordinances.
Select and size ductwork, supply--air registers, and return air grilles
according to ASHRAE (American Society of Heating,
Refrigeration, and Air Conditioning Engineers) recommendations.
The unit has duct flanges on the supply-- and return--air openings
on the side of the unit.
When designing and installing ductwork, consider the following:
1. All units should have field--supplied filters or accessory
filter rack installed in the return--air side of the unit.
Recommended sizes for filters are shown in Table 1.
2. Avoid abrupt duct size increases and reductions. Abrupt
change in duct size adversely affects air performance.
IMPORTANT: Use flexible connectors between ductwork and
unit to prevent transmission of vibration. Use suitable gaskets to
ensure weather--tight and airtight seal. When electric heat is
installed, use fireproof canvas (or similar heat resistant material)
connector between ductwork and unit discharge connection. If
flexible duct is used, insert a sheet metal sleeve inside duct. Heat
resistant duct connector (or sheet metal sleeve) must extend 24--in.
(610 mm) from electric heater element.
3. Size ductwork for cooling air quantity (cfm). The minimum
air quantity for proper electric heater operation is listed in
Table 2. Heater limit switches may trip at air quantities
below those recommended.
4. Seal, insulate, and weatherproof all external ductwork. Seal,
insulate and cover with a vapor barrier all ductwork passing
through conditioned spaces. Follow latest Sheet Metal and
Air Conditioning Contractors National Association
(SMACNA) and Air Conditioning Contractors Association
(ACCA) minimum installation standards for residential
heating and air conditioning systems.
5. Secure all ducts to building structure. Flash, weatherproof,
and vibration--isolate duct openings in wall or roof
according to good construction practices.
CONFIGURING UNITS FOR DOWNFLOW
(VERTICAL)
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before performing service or maintenance operations on the
system, turn off main power to unit and install lockout tag.
1. Open all electrical disconnects and install lockout tag before
starting any service work.
DISCHARGE
!
WARNING
704D-- --A
7
2. Remove horizontal (metal) ductcovers to access vertical
(downflow) discharge duct knockouts in unit basepan. (See
Fig. 9.)
NOTE: These panels are held in place with tabs similar to an
electrical knockout. Reinstall horizontal duct covers (Fig. 9)
shipped on unit from factory. Insure openings are air and
watertight.
NOTE: The design and installation of the duct system must be in
accordance with the standards of the NFPA for installation of
nonresidence--type air conditioning and ventilating systems, NFPA
90A or residence--type, NFPA 90B; and/or local codes and
ordinances.
Adhere to the following criteria when selecting, sizing, and
installing the duct system:
1. Units are shipped for side shot installation.
2. Select and size ductwork, supply--air registers, and
return--air grilles according to American Society of Heating,
Refrigeration and Air Conditioning Engineers (ASHRAE)
recommendations.
704D-- --A
3. Use flexible transition between rigid ductwork and unit to
prevent transmission of vibration. The transition may be
screwed or bolted to duct flanges. Use suitable gaskets to
ensure weather--tight and airtight seal.
4. All units must have field-- supplied filters or accessory filter
rack installed in the return--air side of the unit.
Recommended sizes for filters are shown in Table 1.
5. Size all ductwork for maximum required airflow (either
heating or cooling) for unit being installed. Avoid abrupt
duct size increases or decreases or performance may be
affected.
6. Adequately insulate and weatherproof all ductwork located
outdoors. Insulate ducts passing through unconditioned
space, and use vapor barrier in accordance with latest issue
of Sheet Metal and Air Conditioning Contractors National
Association (SMACNA) and Air Conditioning Contractors
of America (ACCA) minimum installation standards for
heating and air conditioning systems. Secure all ducts to
building structure.
7. Flash, weatherproof, and vibration--isolate all openings in
building structure in accordance with local codes and good
building practices.
Horizontal Duct Covers
Basepan
Downflow
(Vertical)
Supply
Knockout
Fig. 9 -- Supply and Return Duct Opening
Step 8 — Install Electrical Connections
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
The unit cabinet must have an uninterrupted, unbroken
electrical ground to minimize the possibility of personal
injury if an electrical fault should occur. This ground may
consist of an electrical wire connected to the unit ground
screw in the control compartment, or conduit approved for
electrical ground when installed in accordance with NFPA
70 (NEC) (latest edition) (in Canada, Canadian Electrical
Code CSA C22.1) and local electrical codes.
A09061
Basepan
Downflow
(Vertical)
Return
Knockout
A09088
8
!
CAUTION
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution may result in damage to the
unit being installed.
1. Make all electrical connections in accordance with
NFPA 70 (NEC) (latest edition) and local electrical codes
governing such wiring. In Canada, all electrical
connections must be in accordance with CSA standard
C22.1 Canadian Electrical Code Part 1 and applicable
local codes. Refer to unit wiring diagram.
2. Use only copper conductor for connections between
field--supplied electrical disconnect switch and unit. DO
NOT USE ALUMINUM WIRE.
3. Be sure that high--voltage power to unit is within
operating voltage range indicated on unit rating plate. On
3--phase units, ensure phases are balanced within 2
percent. Consult local power company for correction of
improper voltage and/or phase imbalance.
4. Do not damage internal components when drilling
through any panel to mount electrical hardware, conduit,
etc.
HIGH--VOLTAGE CONNECTIONS
The unit must have a separate electrical service with a
field--supplied, waterproof disconnect switch mounted at, or within
sight from the unit. Refer to the unit rating plate, NEC and local
codes for maximum fuse/circuit breaker size and minimum circuit
amps (ampacity) for wire sizing.
The field-- supplied disconnect may be mounted on the unit over
the high--voltage inlet hole when the standard power and
low--voltage entry points are used. See Fig. 2 and 3 for acceptable
location.
See unit wiring label (Fig. 12, 13 and 14) and Fig. 10 for reference
when making high voltage connections. Proceed as follows to
complete the high--voltage connections to the unit.
Single phase units:
1. Run the high-- voltage (L1, L2) and ground lead into the
control box.
2. Connect ground lead to chassis ground connection.
3. Locate the black and yellow wires connected to the line side
of the contactor.
4. Connect field L1 to black wire on connection 11 of the
compressor contactor.
HIGH VOLTAGE
POWER LEADS
(SEE UNIT WIRING
LABEL
3-PHASE SHOWN
1-PHASE USES
TWO POWER
LEADS
CONTROL BOX
LOW-VOLTAGE
POWER LEADS
(SEE UNIT
WIRING LABEL)
)
EQUIP GR
SPLICE BOX
FIELD-SUPPLIED
FUSED DISCONNECT
WHT(W1)
VIO (W2)
YEL(Y)
GRN(G)
RED(R)
BRN(C)
BLU (DH)
GRA (Y2)
3-Phase
Only
W1
W2
C
DH
POWER
SUPPLY
Y
G
R
THERMOSTAT
(TYPICAL
A09066
Fig. 10 -- High-- and Control--Voltage Connections
5.ConnectfieldwireL2toyellowwireonconnection23of
the compressor contactor.
Three--phase units:
1. Run the high-- voltage (L1, L2, L3) and ground lead into the
control box.
2. Connect ground lead to chassis ground connection.
3. Locate the black and yellow wires connected to the line side
of the contactor.
4. Connect field L1 to black wire on connection 11 of the
compressor contactor.
5.ConnectfieldwireL3toyellowwireonconnection13of
the compressor contactor.
6. Connect field wire L2 to blue wire from compressor.
SPECIAL PROCEDURES FOR 208--V OPERATION
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before installing or servicing system, always turn off main
power to system and install lockout tag. With disconnect
switch open, move black wire from transformer (3/16
in.)(4.8 mm) terminal marked 230 to terminal marked 208.
This retaps transformer to primary voltage of 208 vac.
)
704D-- --A
CONTROL VOLTAGE CONNECTIONS
NOTE: Do not use any type of power-- stealing thermostat. Unit
control problems may result.
Use no. 18 American Wire Gage (AWG) color--coded, insulated
(35°C minimum) wires to make the control voltage connections
between the thermostat and the unit. If the thermostat is located
more than 100 ft (30.5 m) from the unit (as measured along the
control voltage wires), use no. 16 AWG color--coded, insulated
(35° C minimum) wires.
9
STANDARD CONNECTION
Locate the seven (eight for 3 --phase) low voltage thermostat leads
in 24 volt splice box. A gray wire is standard on 3--phase units for
connection to an economizer. See Fig. 10 for connection diagram.
Run the low--voltage leads from the thermostat, through the control
wiring inlet hole grommet (Fig. 2 and 3), and into the low--voltage
splice box. Provide a drip loop before running wires through panel.
Secure and strain relief all wires so that they do not interfere with
operation of unit.
If an accessory electric heater is installed, low voltage leads from
heater must be connected to factory supplied control leads from
Indoor Fan Board P4 connector. Factory wires are provided for
electric heat staging W1 and W2 (W2 and W3 on IFB). If room
thermostat has only one stage of supplemental heat, connect white
and violet wires shown in Fig. 10 to second stage heat field wire.
Some electric heaters have four control wires (plus common wire).
Consult unit wiring diagram and electric heater wiring diagram for
additional details.
TRANSFORMER PROTECTION
The transformer is of the energy--limiting type, however a direct
short will likely blow a secondary fuse. If an overload or short is
present, correct overload condition and check for blower fuse on
Indoor Fan Board. Replace fuse as required with correct size and
rating.
Table 1 – Physical Data--Unit 704D---- A
UNIT SIZE 24 30 36 42 48 60
NOMINAL CAPACITY (ton) 2 2 --- 1/ 2 3 3 --- 1/ 2 4 5
SHIPPING WEIGHT* lb.
SHIPPING WEIGHT* (kg)
COMPRESSORS
704D-- --A
Quantity
REFRIGERANT (R --- 410A)
Quantity lb
Quantity (kg)
REFRIGERANT METERING DEVICE TXV
OUTDOOR COIL
Rows...Fins/in.
Face Area (sq ft)
OUTDOOR FAN
Nominal Cfm
Diameter in.
Diameter (mm)
Motor Hp (Rpm)
INDOOR COIL
Rows...Fins/in.
Face Area (sq ft)
INDOOR BLOWER
Nominal Cooling Airflow (Cfm)
Size in.
Size (mm.)
Motor HP (RPM)
HIGH -- -PRESSURE SWITCH
(psig) Cut--- out Reset (Auto)
L O S S --- O F --- C H A R G E / L O W --- P R E S SURE SWITCH (Liquid Line) (psig)
cut--- out Reset (auto)
RETURN--- AIR FILTERS†}
Throwaway Size in.
Throwaway Size (mm)
*For 460 volt units add 14 lb (6.35 kg) to the shipping weight.
{ Required filter sizes shown are based on the larger of the AHRI (Air Conditioning, Heating and Refrigeration Institute) rated cooling airflow or the heating
airflow velocity of 300 ft/minute for throwaway type or 450 ft/minute for high ---capacity type. Air filter pressure drop for non -- -standard filters must not exceed 0.08
IN. W.C.
} If using accessory filter rack refer to the filter rack installation instructions
for correct filter sizes and quantity.
279
127
4.8
2.2
1...21
10.2
2800
24
610
1/5 (810)
2...17
3.7
800
10x10
254x254
1/2 (1050)
20x20x1
508x508x25
284
129
6.2
2.8
1...21
11.9
3000
24
610
1/5 (810)
3...17
3.7
1000
10x10
254x254
1/2 (1050)
20x24x1
508x610x25
290
132
6.4
2.9
1...21
15.4
3200
24
610
1/5 (810)
3...17
3.7
1200
11x10
279.4x254
3/4 (1000)
610x762x25
Scroll
1
1/5 (810)
279.4x254
3/4 (1075)
650 +/ --- 15
420 +/ --- 25
2 0 + / --- 5
45 +/ --- 10
24x30x1
378
171
6.1
2.7
1...21
13.6
3600
26
660
3...17
4.7
1400
11x10
384
174
6.4
2.9
1...21
15.5
4000
26
660
1/5 (810)
3...17
4.7
1600 1750
11x10
279.4x254
1.0 (1075) 1.0 (1040)
24x36x1
610x914x25
2...21
1/5 (810)
3...17
11x10
279.4x254
Table 2 – Minimum Airflow for Safe Electric Heater Operation (CFM)
SIZE 24 30 36 42 48 60
Cfm 800 1000 1200 1400 1600 1750
406
184
10.0
4.5
15.5
3200
26
660
5.7
10
PRE--START-- UP
!
WARNING
ENVIRONMENTAL, FIRE, EXPLOSION,
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death and/or property damage.
1. Follow recognized safety practices and wear protective
goggles when checking or servicing refrigerant system.
2. Relieve and recover all refrigerant from system before
touching or disturbing compressor plug if refrigerant
leak is suspected around compressor terminals.
3. Never attempt to repair soldered connection while
refrigerant system is under pressure.
4. Do not use torch to remove any component. System
contains oil and refrigerant under pressure.
5. To remove a component, wear protective goggles and
proceed as follows:
a. Shut off electrical power to unit and install
lockout tag.
b. Relieve and reclaim all refrigerant from system
using both high-- and low--pressure ports.
c. Cut component connecting tubing with tubing
cutter and remove component from unit.
d. Carefully unsweat remaining tubing stubs when
necessary. Oil can ignite when exposed to torch
flame.
Proceed as follows to inspect and prepare the unit for initial
start --up:
1. Remove all access panels (see Fig. 17).
2. Read and follow instructions on all DANGER, WARNING,
CAUTION, and INFORMATION labels attached to, or
shipped with unit.
3. Make the following inspections:
a. Inspect for shipping and handling damages, such as
broken lines, loose parts, disconnected wires, etc.
b. Inspect for oil at all refrigerant tubing connections and
on unit base. Detecting oil generally indicates a
refrigerant leak. Leak test all refrigerant tubing
connections using electronic leak detector, or
liquid--soap solution. If a refrigerant leak is detected, see
following Check for Refrigerant Leaks section.
c. Inspect all field -- and factory--wiring connections. Be
sure that connections are completed and tight.
d. Ensure wires do not touch refrigerant tubing or sharp
sheet metal edges.
e. Inspect coil fins. If damaged during shipping and
handling, carefully straighten fins with a fin comb.
4. Verify the following conditions:
a. Make sure that condensate drain pan and trap are filled
with water to ensure proper drainage.
b. Make sure that all tools and miscellaneous loose parts
have been removed.
START-- UP
Step 1 — Check for Refrigerant Leaks
Proceed as follows to locate and repair a refrigerant leak and to
charge the unit:
1. Locate leak and make sure that refrigerant system pressure
has been relieved and reclaimed from both high-- and
low--pressure ports.
2. Repair leak following accepted practices.
NOTE: Install a filter drier whenever the system has been opened
for repair.
3. Add a small charge of Puron (R--410A) refrigerant vapor to
system and leak-- test unit.
4. Recover refrigerant from system and evacuate to 500
microns if no additional leaks are found.
5. Charge unit with Puron (R--410A) refrigerant, using an
accurate scale. Refer to unit rating plate for required charge.
Step 2 — Start--Up Cooling Section And Make
Adjustments
Complete the required procedures given in the Pre--Start--Up
section before starting the unit. Do not jumper any safety devices
when operating the unit. Do not operate the unit when the outdoor
temperature is below 40°F(4°C) (unless accessory low--ambient
kit is installed). Do not rapid cycle the compressor. Allow 5
minutes between “on” cycles to prevent compressor damage.
CHECKING COOLING CONTROL OPERATION
Start and check the unit for proper cooling control operation as
follows:
1. Place room thermostat SYSTEM switch in OFF position.
Observe that blower motor starts when FAN switch is
placed in ON position and shuts down when FAN switch is
placed in AUTO position.
2. Place SYSTEM switch in COOL position and FAN switch
in AUTO position. Set cooling control below room
temperature. Observe that compressor, condenser fan, and
evaporator blower motors start. Observe that compressor
and outdoor fan shut down when control setting is satisfied
and that indoor blower shuts down after 90 sec. fan time
delay expires.
IMPORTANT: Three--phase, scroll compressors are direction
oriented. Unit must be checked to ensure proper compressor
3--phase power lead orientation. If not corrected within 5 minutes,
the internal protector will shut off the compressor. The 3--phase
power leads to the unit must be reversed to correct rotation. When
turning backwards, the difference between compressor suction and
discharge pressures may be minimal.
CHECKING AND ADJUSTING REFRIGERANT
CHARGE
The refrigerant system is fully charged with Puron (R--410A)
refrigerant and is tested and factory sealed.
NOTE: Adjustment of the refrigerant charge is not required
unless the unit is suspected of not having the proper Puron
(R--410A) charge.
A subcooling charging chart is attached to the inside of the
compressor access panel (see Fig. 17). The chart includes the
required liquid line temperature at given discharge line pressures
and outdoor ambient temperatures.
An accurate thermocouple-- or thermistor--type thermometer, and a
gauge manifold are required when using the subcooling charging
method for evaluating the unit charge. Do not use mercury or small
dial--type thermometers because they are not adequate for this type
of measurement.
NOTE: Allow system to operate for a minimum of 15 minutes
before checking or adjusting refrigerant charge.
IMPORTANT: When evaluating the refrigerant charge, an
indicated adjustment to the specified factory charge must always be
very minimal. If a substantial adjustment is indicated, an abnormal
condition exists somewhere in the cooling system, such as
insufficient airflow across either coil or both coils.
11
704D-- --A
Proceed as follows:
1. Remove caps from low-- and high-- pressure service fittings.
2. Using hoses with valve core depressors, attach low-- and
high--pressure gauge hoses to low-- and high--pressure
service fittings, respectively.
3. Start unit and let run until system pressures stabilize.
4. Measure and record the following:
a. Outdoor ambient--air temperature (°F[°C] db).
b. Liquid line temperature (°F[°C]) at T XV.
c. Discharge (high-- side) pressure (psig).
d. Suction (low--side) pressure (psig) (for reference only).
5. Using Cooling Charging Charts compare outdoor--air
temperature (°F[°C] db) with the discharge line pressure
(psig) to determine desired system operating liquid line
temperature (See Fig. 15).
6. Compare actual liquid line temperature with desired liquid
line temperature. Using a tolerance of ±2°F(±1.1°C), add
refrigerant if actual temperature is more than 2°F(1.1°C)
higher than proper liquid line temperature, or remove
704D-- --A
refrigerant if actual temperature is more than 2°F(1.1°C)
lower than required liquid line temperature.
NOTE: If the problem causing the inaccurate readings is a
refrigerant leak, refer to Check for Refrigerant Leaks section.
INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in unit damage.
For cooling operation, the recommended airflow is 350 to
450 cfm for each 12,000 Btuh of rated cooling capacity. For
heating operation, the airflow must produce a temperature
rise that falls within the range stamped on the unit rating
plate.
NOTE: Be sure that all supply-- and return--air grilles are open,
free from obstructions, and adjusted properly.
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect electrical power to the unit and install lockout
tag before changing blower speed.
This unit is factory-set up for use with a single cooling fan speed.
In addition, this unit has the field-selectable capability to run two
different cooling fan speeds: The rated cooling fan speed (350~400
CFM/Ton) and an enhanced dehumidification fan speed (As low as
320 CFM/Ton) for use with either a dehumidistat or a thermostat
that supports dehumidification.
The cooling speed is marked “LOW” on the interface fan board
(IFB) (See Fig. 11) . The factory-shipped settings are noted in
Table 4. There are 4 additional speed tap wires available for use in
either electric heating or cooling (For color coding on the indoor
fan motor leads, see Table 3). The additional 4 speed tap wires are
CAUTION
WARNING
shipped loose with vinyl caps and are located in the control box,
near the interface fan board (IFB) (See Fig. 11).
SINGLE COOLING FAN SPEED SET--UP (Dehumidification feature not
To change cooling speed:
1. Remove the vinyl cap off of the desired speed tap wire
(Refer to Table 3 for color coding). Add the wet coil
pressure drop in Table 5 to the system static to determine the
correct cooling airflow speed in Table 4 that will deliver the
nominal cooling airflow as listed in Table 1 for each size.
2. Remove the current speed tap wire from the “LOW”
terminal on the interface fan board (IFB) (See Fig. 11) and
place vinyl cap over the connector on the wire.
3. Connect the desired speed tap wire to the “LOW” terminal
on the interface fan board (IFB).
NOTE: If accessory electric heat is installed, and the electric heat
fan speed is chosen to be the same as the normal cooling fan speed,
the dry airflow must meet or exceed the minimum airflow speed
specified in Table 2 for the specific size unit.
used)
TWO COOLING FAN SPEEDS SET--UP (Dehumidification feature
IMPORTANT: Dehumidification control must open control
circuit on humidity rise above set point.
Use of the dehumidification cooling fan speed requires use of
either a 24 VAC dehumidistat or a thermostat which includes
control of a 24 VAC dehumidistat connection. In either case, the
dehumidification control must open the control circuit on humidity
rise above the dehumidification set point. Dehumidification
controls are available with the reverse logic; these must not be
used.
1. Using Fig. 11, move the two pin DEHUM jumper from the
“STD” position to the “DEHUM” position.
2. Remove fan speed tap wire from the “LOW” terminal on
the interface fan board (IFB) (See Fig. 11).
3. Determine correct normal cooling fan speed for unit and
application. Add the wet coil pressure drop in Table 5 to
the system static to determine the correct cooling airflow
speed in Table 4 that will deliver the nominal cooling
airflow as listed in Table 1 for each size.
NOTE: If accessory electric heat is installed, the dry
airflow must meet or exceed the minimum airflow speed
specified in Table 2 for the specific size unit. The electric
heat fan speed will be the same as the normal cooling fan
speed.
4. Remove the vinyl cap off of the desired speed tap wire
(Refer to Table 3 for color coding) for the normal cooling
fan speed and place desired speed tap wire on “HIGH” on
the interface board.
5. Refer to airflow tables (Table 4) to determine allowable
speeds for the dehumidification cooling fan speed. In Table
4, speeds that are not allowed for dehumidification cooling
are shaded.
6. Remove the vinyl cap off of the desired speed tap wire
(Refer to Table 3 for color coding) for the dehumidification
cooling fan speed and place desired speed tap wire on the
“LOW” connection on the interface board (IFB). Verify
that static pressure is in the acceptable range for the speed
tap to be used for dehumidification cooling.
7. Use any spare vinyl plugs to cap any unused speed tap
wires.
used)
12
HIGH LOW COM
07 09 080L0
C9
QIL Z2 06 04
D5 D3
P3
SDL
SSTZ-8
QC5
R2
C4
QCB
Y
KZ
R13 C8 R11 Q1
ALO
A7 R9 AB A15
C7
JW5
R3 R5 R6
P1
STD
QC4
DEHUM
U1
P2 JW3
R W2 Y C W3W3W2 W2C
Y2 Y1
W2W3
QC3
KL
D2
Q3
RL
G1
G2
Z1
C3
JWZ
JW4
GCR
YDH
DCR QCR
C
QC1
AL2
01
C0
R4 RL4
24VAC/R3AMP CDM/C
F1
P4
A09059
Fig. 11 -- Interface Fan Board (IFB)
SINGLE SPEED COOLING WITH HIGHER
ELECTRIC H EAT
This unit can also be configured to operate with single speed
cooling and a higher speed for an accessory electric heater.
1. Using Fig. 11, move the two pin DEHUM jumper from the
“STD” position to the “DEHUM” position.
2. See Table 2 for minimum airflow for electric heat operation.
Add electric heater and filter pressure drop to duct system
static pressure to determine total external static pressure.
3. Select speed tap from Table 4 that will achieve required
airflow from Table 2.
4. Remove the vinyl cap off of the desired speed tap wire
(Refer to Table 3 for color coding).
5. Connect the desired speed tap wire to the “HIGH” terminal
on the interface fan board (IFB).
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in unit component
damage or improper operation.
To use this mode, a speed connection must be made on the
“HIGH” terminal that meets or exceeds the minimum
airflow found in Table 2.
SPEED
CAUTION
Table 3 – Color Coding for Indoor Fan Motor Leads
Black = High Speed
Orange = Med--High Speed
Red = Med Speed
Pink = Med --Low Speed
Blue = Low Speed
!
WARNING
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Disconnect electrical power to the unit and install lockout
tag before changing blower speed.
CONTINUOUS FAN OPERATION
When the DEHUM feature is not used, the continuous fan speed
will be the same as cooling fan speed. When the DEHUM feature
is used, the continuous fan will operate on IFB “LOW” speed
when the DH control lead is not energized, or IFB “HIGH” speed
when the DH lead is energized (see Fig. 11).
COOLING SEQUENCE OF OPERATION
With the room thermostat SYSTEM switch in the COOL position
and the FAN switch in the AUTO position, the cooling sequence of
operation is as follows:
When the room temperature rises to a point that is slightly above
the cooling control setting of the thermostat, the thermostat
completes the circuit between thermostat terminal R to terminals Y
and G. These completed circuits through the thermostat connect
contactor coil (C) (through unit wire Y) and time delay relay
(TDR) (through unit wire G) across the 24--V secondary of
transformer (TRAN).
The normally open contacts of energized contactor (C) close and
complete the circuit through compressor motor (COMP) to
condenser (outdoor) fan motor (OFM). Both motors start instantly.
A set of normally open contacts on the interface fan board (IFB)
are closed which energizes a circuit to the indoor fan motor (IFB).
NOTE: Once the compressor has started and then has stopped, it
should not be started again until 5 minutes have elapsed.
The cooling cycle remains on until the room temperature drops to a
point that is slightly below the cooling control setting of the room
thermostat. At this point, the thermostat breaks the circuit between
thermostat terminal R to terminals Y and G. These open circuits
deenergize contactor coil C and IFB. The condenser and
compressor motors stop. After a 90 --second delay, the blower
motor stops. The unit is in a standby condition, waiting for the next
call for cooling from the room thermostat.
704D-- --A
13
Table 4 – Dry Coil Air Delivery* -- Horizontal and Downflow Discharge --
Unit 704D-- --A24--60
UNIT MOTOR SPEED
Low Blue CFM 754 650 538 429 --- --- --- --- ---
Med-Low Pink CFM 851 777 675 591 475 --- --- --- ---
704D------A24
704D------A30
704D------A36
704D------A42
704D------A48
704D-- --A
704D------A060
* Air delivery values a r e without air filter and a re for dry coil (See Table 5 --- 704D------A Wet Coil Pressure Drop table).
1
Factory --- shipped cooling speed
Note: Deduct field---supplied air filter pressure drop and wet coil pressure drop to obtain external static pressure available for ducting.
Shaded areas indicate airflows that are not recommended for dehumidification control.
1
Medium
Med-High Orange CFM 1009 917 840 759 667 577 447 --- ---
High Black CFM 1241 1167 1111 1036 969 881 818 731 640
Low Blue CFM 741 638 547 415 --- --- --- --- ---
Med-Low Pink CFM 973 887 823 733 665 538 451 --- ---
Medium Red CFM 1088 1023 954 881 800 723 658 563 461
Med-High
Med-High
1
High Black CFM 1202 1140 1082 1015 961 881 810 732 631
Low Blue CFM 1234 1168 1093 1021 961 894 825 759 687
Med-Low Pink CFM 1290 1223 1154 1090 1027 977 894 828 762
1
Medium
Med-High Orange CFM 1606 1546 1489 1430 1371 1316 1258 1208 1140
High Black CFM 1630 1580 1517 1463 1407 1339 1277 1210 1131
Low Blue CFM 1295 1234 1182 1126 1075 1016 955 898 857
Med-Low Pink CFM 1345 1282 1235 1194 1140 1095 1027 974 921
Medium Red CFM 1505 1452 1413 1358 1323 1282 1234 1169 1130
1
High Black CFM 1705 1643 1607 1568 1518 1483 1448 1404 1360
Low Blue CFM 1402 1351 1311 1263 1224 1172 1136 1080 1041
Med-Low Pink CFM 1457 1404 1367 1318 1284 1233 1197 1144 1104
1
Medium
Med-High Orange CFM 2149 2111 2062 2026 1980 1945 1905 1864 1793
High Black CFM 2344 2306 2259 2203 2141 2070 1991 1902 1803
Med-Low Pink CFM 1678 1635 1602 1558 1513 1474 1438 1404 1349
1
Medium
Med-High Orange CFM 2131 2088 2065 2013 1982 1941 1888 1860 1785
High Black CFM 2461 2409 2339 2286 2192 2140 2062 1968 1874
WIRE
COLOR
Red CFM 941 851 774 684 576 479 --- --- ---
Orange CFM 1140 1064 996 915 840 758 687 564 480
Red CFM 1354 1290 1226 1158 1102 1046 981 918 843
Orange CFM 1545 1492 1449 1411 1362 1313 1278 1231 1188
Red CFM 1736 1695 1642 1601 1553 1512 1465 1427 1381
Red CFM 1962 1915 1880 1843 1794 1753 1711 1675 1628
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
EXTERNAL STATIC PRESSURE (IN. W.C.)
Table 5 – 704D----A Wet Coil Pressure Drop (IN. W.C.)
UNIT
SIZE
600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000
24 0.030 0.037 0.044 0.053 0.063 --- --- --- --- --- --- --- --- --- --30 --- 0.037 0.044 0.053 0.063 0.072 0.081 0.105 --- --- --- --- --- --- --36 --- --- --- 0.055 0.060 0.090 0.100 0.110 0.140 --- --- --- --- --- --42 --- --- --- --- 0.045 0.050 0.060 0.065 0.075 0.080 0.090 0.094 0.110 --- --48 --- --- --- --- --- --- 0.041 0.063 0.085 0.100 0.104 0.110 0.120 0.130 --60 --- --- --- --- --- --- --- --- --- 0.060 0.065 0.072 0.077 0.085 0.100
STANDARD CFM (S.C.F .M)
Table 6 – Wet Coil Air Delivery (CFM) -- Downflow -- High Speed with 1-- in. (25 mm) Filter and Economizer
UNIT SIZE
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
36 1333 1289 1256 1214 1152 1118 1076 1035 997 950
42 1612 1569 1527 1481 1451 1393 1351 1317 1278 1242
48 2166 2085 2002 1919 1798 1709 1582 1467 1270 988
60 2298 2239 2180 2110 2044 1951 1862 1777 1697 1591
EXTERNAL STATIC PRESSURE (IN. W.C.)
Table 7 – Filter Pressure Drop (IN. W.C.)
FILTER SIZE
in. (mm)
20X20X1
(508X508X25)
20X24X1
(508X610x25)
24X30X1
(610X762x25)
24X36X1
(610X914X25)
500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300
0.05 0.07 0.08 0.10 0.12 0.13 0.14 0.15 — — — — — — — — — — —
— — — .09 .10 .11 .13 .14 .15 .16 — — — — — — — — —
— — — 0.04 0.05 0.06 0.07 0.07 0.08 0.09 0.10 — — — — — — — —
— — — — — — — 0.06 0.07 0.07 0.08 0.09 0.09 0.10 0.11 0.12 0.13 0.14 0.14
CFM
Table 8 – Electric Heat Pressure Drop (IN. W.C.)
Small Cabinet: 24--36 CFM
5kw 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.04 0.06 0.07
7.5 kw 0.00 0.00 0.00 0.00 0.00 0.00 0.02 0.03 0.05 0.07 0.08 0.09
10 kw 0.00 0.00 0.00 0.00 0.00 0.02 0.04 0.06 0.07 0.09 0.10 0.11
15 kw 0.00 0.00 0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18
20 kw 0.00 0.00 0.02 0.04 0.06 0.08 0.09 0.11 0.13 0.15 0.17 0.19
500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600
Electric Heat Pressure Drop (IN. W.C.)
Large Cabinet 42--60 CFM
5kw 0.00 0.00 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12
7.5 kw 0.00 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13
10 kw 0.00 0.00 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13
15 kw 0.00 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15
20 kw 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 0.11 0.12 0.13 0.14 0.15 0.16
1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500
14
CONNECTION WIRING DIAGRAM
DANGER: ELECTRICAL SHOCK HAZARD DISCONNECT POWER BEFORE SERVICING
FOR WIRING WITH
ELECTRIC HEATERS
SEE SCHEMATIC
ON HEATER
ACCESSORY.
SEE NOTE 7
TSTAT
UNIT ONLY
MAXIMUM WIRE
SIZE 2 AWG.
12
11
N1
FIELD
SUPPLY
POWER
L1
L2
EQUIP_GND
IF USED
CCH
BLK
GRN
BLK
1
BLK
1
YEL
C
11 21
23 23
BLK
BLK
YEL
BLK
H
BLK
YEL
YEL
CAP
BRN
BRN
F
C
COMPRESSOR PLUG
C
YEL
YEL
BLK
R
BLU
S
YEL
L2
GRN-YEL
GND
BLK
230
COM
200
GRN/YEL
TRAN
24V
C
BRN
BRN
GND
L1
COM
BRN
SEE NOTE 5 & 6
SCHEMATIC
230-1-60
OFM
COMP
IFM
2435
1
704D-- --A
RED
BLU
SEE NOTE 8
RED
R
BRN
C
YEL
Y
GRN
G
DH
BLU
WHT
W2
VIO
W3
R
24VAC
3A
C
COM
HIGH
COM
COM
FUSE
STD
IFB
DEHUM
LOW
WHT
VIO
PNK
GRY
54321
6
7
P1
G
C
R
Y1/Y
Y2/DH
W3
W2
123
4
Y
P2
R
Y
C
W2
P4
12435
C
W2
W2
W3
W3
BRN
ACCESSSORY ELECTRIC HEAT
1
WHT
1
VIO
HR1,2,3
1
PNK
1
GRY
HR1,2 & 3 (15 KW)
1
BRN
HR1 (5 KW)
& 4 (20 KW)
HR1 & 2 (10 KW)
HR1
1
1
HR4
HR2
HR3
PNK
SEE NOTE 4
3
BRN
3
BRN
RED
BLK
ORN
BRN
BRN
BRN
UNIT COMPONENT ARRANGEMENT
OUTDOOR FAN
SECTION
COMPRESSOR
INDOOR FAN
SECTION
SECTION
LPS
HPS
CAP
CF
H
COMP
C
S
CCH
R
HPS
BLU
BLK
BLK
LPS
BLU
BLU
C
C2
C1
LEGEND
FIELD SPLICE
OFM
CONTROL BOX AREA
SINGLE PT.
CONNECTION
FOR
IFM
ELECT.HEAT
SEE HEATER
SCHEMATIC
FOR WIRING
23
C
TRAN
IFB
24V SPLICE
BOX
21
1123
EQUIP.
GND
DISCONNECT
PER NEC
24V POWER ENTRY
TERMINAL (MARKED)
TERMINAL (UNMARKED)
SPLICE (IF USED)
SPLICE (MARKED)
FACTORY WIRING
FIELD CONTROL WIRING
FIELD POWER WIRING
ACCESSORY OR OPTIONAL
WIRING
TO INDICATE COMMON
POTENTIAL ONLY:
NOT TO REPRESENT WIRING
NOTES:
1. IF ANY OF THE ORIGINAL WIRES FURNISHED ARE REPLACED,
IT MUST BE REPLACED WITH TYPE 90 DEGREE C WIRE OR
IT'S EQUIVALENT.
2. SEE PRICE PAGES FOR THERMOSTAT AND SUBBASES.
3. USE 75 DEGREE COPPER CONDUCTORS FOR FIELD INSTALLATION.
4. REFER TO INSTALLATION INSTRUCTIONS
FOR CORRECT SPEED SELECTION OF IFM.
5. RELOCATION OF SPEED TAPS MAY BE REQUIRED
WHEN USING FIELD INSTALLED ELECTRIC HEATERS,
CONSULT INSTALLATION INSTRUCTIONS TO
DETERMINE CORRECT SPEED TAP SETTING.
6. "DO NOT DISCONNECT PLUG UNDER LOAD."
7. THIS FUSE IS MANUFACTURED BY LITTELFUSE, P/N 257003.
8. UNIT FACTORY-SHIPPED IN STD MODE.
ENERGIZED
C CONTACTOR
CAP CAPACITOR
CCH CRANK CASE HEATER
COMP COMPRESSOR MOTOR
DEHUM DEHUMIDIFICATION MODE
GND GROUND
HPS HIGH PRESSURE SWITCH
HR HEATER RELAY
IFB INTERFACE FAN BOARD
IFM INDOOR FAN MOTOR
LPS LOW PRESSURE SWITCH
OFM OUTDOOR FAN MOTOR
STD STANDARD
TRAN TRANSFORMER
A10205C
Fig. 12 -- Connection Wiring Diagram 208/230--1 --60
15
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