Bryant Legacy 677C**C Series User manual

1
677C----C
LEGACYt14 SEER SINGLE-- PACKAGED HYBRID HEATrDUAL
FUEL SYSTEM WITH PURONr(R--410A) REFRIGERANT
SINGLE PHASE 2--5 NOMINAL TONS (SIZES 24--60)
THREE PHASE 3--5 NOMINAL TONS (SIZES 36--60)
Installation Instructions
IMPORTANT: Effective January 1, 2015, all split system and
packaged air conditioners must be installed pursuant to applicable
regional efficiency standards issued by the Department of Energy.
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 INSTALLATION 2--13.................
Check Equipment 2..................................
Identify Unit 2....................................
Inspect Shipment 2.................................
Provide Unit Support 2...............................
Roof Curb 2......................................
Slab Mount 6.....................................
Field Fabricate Ductwork 6............................
Provide Clearances 6.................................
Rig and Place Unit 6.................................
Connect Condensate Drain 7...........................
Install Flue Hood 7...................................
Install Gas Piping 7..................................
Install Duct Connections 8.............................
Configuring Units for Downflow (Vertical)
Discharge 8......................................
Install Electrical Connections 12........................
High--Voltage Connections 12........................
Special Procedures for 208--V Operation 12..............
Control Voltage Connections 12.......................
Balance Point Setting Thermidistat or Hybrid Heat
Thermostat 13....................................
Transformer Protection 13...........................
PRE--START--UP 13...................................
START--UP 14--19.....................................
Check for Refrigerant Leaks 14.........................
Unit Sequence of Operation 14.........................
Start--Up Heating and Make Adjustments 15...............
Checking Heating Control 15.........................
Check Gas Input 15................................
Adjust Gas Input 16................................
Check Burner Flame 16.............................
Start--Up Cooling and Make Adjustments 17...............
Checking Cooling Control Operation 17................
Checking and Adjusting Refrigerant 17.................
Indoor Airflow and Airflow Adjustments 18.............
Continuous Fan Operation 19........................
MAINTENANCE 49--52................................
Air Filter 49........................................
Indoor Blower and Motor 49...........................
Flue Gas Passageways 50..............................
Limit Switch 50.....................................
Burner Ignition 50...................................
Main Burners 50....................................
Outdoor Coil, Indoor Coil, & Condensate Drain Pan 50......
A09034
Fig. 1 -- Unit 677C----C
Outdoor Fan 51.....................................
Electrical Controls and Wiring 51.......................
Refrigerant Circuit 51.................................
Gas Input 52........................................
Indoor Airflow 52...................................
Check Defrost Thermostat 52...........................
PuronRItems 52....................................
TROUBLESHOOTING 56..............................
START--UP CHECKLIST 56............................
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory--authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Have a 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 Fuel Gas Code
(NFGC) NFPA 54/ANSI Z223.1, and the National Electrical Code
(NEC) NFPA 70.
In Canada refer to the current editions of the National Standards of
Canada CAN/CSA--B149.1 and .2 Natural Gas and Propane
Installation codes, and 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 manu-
als, 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 per-

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sonal injury or death. CAUTION is used to identify unsafe practic-
es which may result in minor personal injury or product and prop-
erty 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.
!WARNING
FIRE, EXPLOSION, ELECTRICAL SHOCK AND
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
A qualified installer or agency must use only
factory--authorized kits or accessories when modifying this
product.
WARNING
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
When removing access panels (see Fig. 19) or performing
maintenance functions inside your unit, be aware of sharp
sheet metal parts and screws. Although special care is taken
to reduce sharp edges to a minimum, be extremely careful
and wear appropriate protective clothing, safety glasses and
gloves when handling parts or reaching into the unit.
CAUTION
!
INTRODUCTION
This unit (see Fig. 1) is a fully self--contained, combination
Category I gas heating/electric heating and cooling unit designed
for outdoor installation (See Fig. 2 and 3 for unit dimensions). All
unit sizes have return and discharge openings for both horizontal
and downflow configurations, and are factory shipped with all
downflow duct openings covered. Units may be installed either on
a rooftop, a cement slab, or directly on the ground, if local codes
permit (See Fig. 4 for roof curb dimensions).
In gas heating mode, this unit is designed for a minimum
continuous return--air temperature of 55_F(13_C) db and a
maximum continuous return--air temperature of 80_F(27_C) db.
Failure to follow these return--air temperature limits may affect
reliability of heat exchangers, motors, and other components.
Models with an N in the 13th position of the model number are
dedicated Low NOx units designed for California installations.
These models meet the California maximum oxides of nitrogen
(NOx) emissions requirements of 40 nanograms/joule or less as
shipped from the factory and must be installed in California Air
Quality Management Districts or any other regions in North
America where a Low NOx rule exists.
RECEIVING AND INSTALLATION
Step 1 — Check Equipment
IDENTIFY UNIT
The unit model number and serial number are stamped on the unit
information 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 9 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
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 mm). 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
!
677C-- --C

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A150538
Fig. 2 -- 24--30 Unit Dimensions
677C-- --C

4
A150539
Fig. 3 -- 36--60 Unit Dimensions
677C-- --C

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LARGE CURB
SMALL CURB
ROOF CURB DETAIL
Wood nailer*
Roofcurb*
Insulation
(field supplied)
*Provided with roofcurb
Cant strip
field supplied
Roofing material
field supplied
Flashing field
supplied
HVAC unit
base rails
Roofcurb
Sealing
Gasket
HVAC unit
basepan
Anchor screw
A09090
A09415
A09418
C
B
A
F
D
E
G
H
C
B
A
DE
H
F
G
A09419
UNIT SIZE CATALOG
NUMBER
A
IN. (mm)
B
IN. (mm)*
C
IN. (mm)
D
IN. (mm)
E
IN. (mm)
F
IN. (mm)
G
IN. (mm)
H
IN. (mm)
Small CPRFCURB010A00 11 (279) 10 (254)
16 (406) 47.8
(1214)
32.4 (822)
2.7 (69)
30.6 (778)
46.1 (1170)
CPRFCURB011A00 14 (356)
Large CPRFCURB012A00 11 (279) 14 (356) 43.9
(1116) 42.2 (1072)
CPRFCURB013A00 14 (356)
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.
IMPORTANT: Do not install large base pan HYBRID HEAT
units onto the small base pan (common curb). The center of gravity
on a large base pan HYBRID HEAT unit could overhang the curb
causing an unsafe condition. Before installing any large base pan
unit onto the common curb, check the “Y” distance in the product
literature dimensional drawing to ensure that “Y” is greater than 14
in. (356 mm). Do not install any large base pan unit onto the
common curb with a “Y” dimension (center of gravity) less than 14
in. (356 mm).
Fig. 4 -- Roof Curb Dimensions
677C-- --C

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ACCESS PANELS MUST BE IN PLACE WHEN RIGGING.
PANNEAUX D'ACCES DOIT ÊTRE EN PLACE POUR MANIPULATION.
50CY502286 2.0
CAUTION - NOTICE TO RIGGERS
PRUDENCE - AVIS AUX MANIPULATEUR
Use top skid as spreader bar. / Utiliser la palette du haut comme barre de répartition
SEAL STRIP MUST BE IN
PLACE BEFORE PLACING
UNIT ON ROOF CURB
DUCTS
DETAIL A
VOIR DÉTAIL A
MINIMUM HEIGHT: 36" (914.4 mm)
HAUTEUR MINIMUM
UNIT HEIGHT
HAUTEUR D'UNITÉ
SEE DETAIL A
VOIR DÉTAIL A
BANDE SCELLANT DOIT ÊTRE
EN PLACE AVANT DE PLACER
L'UNITÉ SUR LA BASE DE TOIT
A09051
Unit 24 30 Unit 36 42 48 60
lb kg lb kg lb kg lb kg lb kg lb kg
Rigging
Weight 365 166 395 179 Rigging Weight 440 200 475 215 500 227 515 234
NOTE: See dimensional drawing for corner weight distribution.
Fig. 5 -- Suggested Rigging
SLAB MOUNT
Place the unit on a solid, level pad that is at least 2 in. (51 mm)
above grade. The pad should extend approximately 2 in. (51 mm)
beyond the casing on all 4 sides of the unit. Do not secure the unit
to the pad except when required by local codes.
Step 3 — 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.
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 comply with applicable fire codes.
Read unit rating plate for any required clearances around ductwork.
Cabinet return--air static shall not exceed --.25 IN. W.C.
Step 4 — Provide Clearances
The required minimum operating and service clearances are shown
in Fig. 2 and 3.
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.
The condenser fan pulls air through the condenser coil and
discharges it through the top grille. Be sure that the fan discharge
does not recirculate to the condenser 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).
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. The unit may be installed
on wood flooring or on Class A, B, or C roof covering materials.
Step 5 — Rig and Place Unit
PERSONAL INJURY OR PROPERTY DAMAGE
HAZARD
Failure to follow this warning could result in personal
injury, death or property damage.
When installing the unit on a rooftop, be sure the roof will
support the additional weight.
!WARNING
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,
and any other safety precautions that might apply.
677C-- --C

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Training for operators of the lifting equipment should include, but
not be limited to, the following:
1. Application of the lifter to the load, and adjustment of the
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
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 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.
UNIT FALLING HAZARD
Failure to follow this warning could result in personal
injury or death.
Never stand beneath rigged units or lift over people.
!WARNING
PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in personal
injury/death or property damage.
When straps are taut, the clevis should be a minimum of 36
in. (914 mm) above the unit top cover.
!WARNING
Rigging/Lifting of Unit (See Fig. 5)
Lifting holes are provided in base rails as shown in Fig. 2 and 3.
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.
2. 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).
3. 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.
Step 6 — Connect Condensate Drain
NOTE: When installing condensate drain connection be sure to
comply with local codes and restrictions.
Unit disposes of condensate water through a 3/4 in. NPT fitting
which exits through the compressor access panel (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 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. 6). Prime the trap with water. When using a
gravel apron, make sure it slopes away from the unit.
If the installation requires draining the condensate water away
from the unit, install a 2--in. (51 mm) trap at the condensate
connection to ensure proper drainage (See Fig. 6). Make sure that
the outlet of the trap is at least 1 in. (25 mm) lower than the
drain--pan condensate connection. This prevents the pan from
overflowing.
Prime the trap with water. 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 m) of horizontal run. Be sure to check the drain
tube for leaks.
TRAP
OUTLET
1-in. (25 mm) min.
2-in. (51 mm) min.
A09052
Fig. 6 -- Condensate Trap
Step 7 — Install Flue Hood
The flue assembly is secured and shipped in the return air duct.
Remove duct cover to locate the assembly (See Fig. 8).
NOTE: Dedicated low NOx models MUST be installed in
California Air Quality Management Districts where a Low NOx
rule exists.
These models meet the California maximum oxides of nitrogen
(NOx) emissions requirements of 40 nanograms/joule or less as
shipped from the factory.
NOTE: Low NOx requirements apply only to natural gas
installations.
CARBON MONOXIDE POISONING HAZARD
Failure to follow this warning could result in personal
injury or death.
The venting system is designed to ensure proper venting.
The flue hood assembly must be installed as indicted in this
section of the unit installation instructions.
!WARNING
Install the flue hood as follows:
1. This installation must conform with local building codes
and with the National Fuel Gas Code (NFGC) NFPA 54 /
ANSI Z223.1, (in Canada, CAN/CSA B149.1, and
B149.2) latest revision. Refer to Provincial and local
plumbing or wastewater codes and other applicable local
codes.
2. Remove flue hood from shipping location (inside the return
section of the blower compartment--see Fig. 8). Remove the
return duct cover to locate the flue hood. Place flue hood
assembly over flue panel. Orient screw holes in flue hood
with holes in the flue panel.
3. Secure flue hood to flue panel by inserting a single screw on
the top flange and the bottom flange of the hood.
Step 8 — Install Gas Piping
The gas supply pipe enters the unit through the access hole
provided. The gas connection to the unit is made to the 1/2--in.
(12.7 mm) FPT gas inlet on the gas valve.
Install a gas supply line that runs to the heating section. Refer to
Table 2 and the NFGC for gas pipe sizing. Do not use cast--iron
pipe. It is recommended that a black iron pipe is used. Check the
local utility for recommendations concerning existing lines. Size
677C-- --C

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gas supply piping for 0.5 IN. W.C. maximum pressure drop. Never
use pipe smaller than the 1/2--in. (12.7 mm) FPT gas inlet on the
unit gas valve.
For natural gas applications, the gas pressure at unit gas connection
must not be less than 4.0 IN. W.C. or greater than 13 IN. W.C.
while the unit is operating. For propane applications, the gas
pressure must not be less than 11.0 IN. W.C. or greater than 13 IN.
W.C. at the unit connection.
A 1/8--in. (3.2 mm) NPT plugged tapping, accessible for test gauge
connection, must be installed immediately upstream of the gas
supply connection to the gas valve.
When installing the gas supply line, observe local codes pertaining
to gas pipe installations. Refer to the NFGC NFPA 54/ANSI
Z223.1 latest edition (in Canada, CAN/CSA B149.1).
NOTE: In the state of Massachusetts:
1. Gas supply connections MUST be performed by a licensed
plumber or gas fitter.
2. When flexible connectors are used, the maximum length
shall not exceed 36 in. (915 mm).
3. When lever handle type manual equipment shutoff valves
are used, they shall be T--handle valves.
4. The use of copper tubing for gas piping is NOT approved
by the state of Massachusetts.
In the absence of local building codes, adhere to the following
pertinent recommendations:
1. Avoid low spots in long runs of pipe. Grade all pipe 1/4 in.
(6.35 mm) for every 15 ft (4.6 m) of length to prevent traps.
Grade all horizontal runs downward to risers. Use risers to
connect to heating section and to meter.
2. Protect all segments of piping system against physical and
thermal damage. Support all piping with appropriate straps,
hangers, etc. Use a minimum of one hanger every 6 ft (1.8
m). For pipe sizes larger than 1/2 in., (12.7 mm) follow
recommendations of national codes.
3. Apply joint compound (pipe dope) sparingly and only to
male threads of joint when making pipe connections. Use
only pipe dope that is resistant to action of liquefied
petroleum gases as specified by local and/or national codes.
Never use Teflon tape.
4. Install sediment trap in riser leading to heating section (See
Fig. 7). This drip leg functions as a trap for dirt and
condensate.
OUT
TEE
NIPPLE
CAP
IN
C99020
Fig. 7 -- Sediment Trap
5. Install an accessible, external, manual main shutoff valve in
gas supply pipe within 6 ft (1.8 m) of heating section.
6. Install ground--joint union close to heating section between
unit manual shutoff and external manual main shut--off
valve.
7. Pressure test all gas piping in accordance with local and
national plumbing and gas codes before connecting piping
to unit.
NOTE: Pressure test the gas supply system after the gas supply
piping is connected to the gas valve. The supply piping must be
disconnected from the gas valve during the testing of the piping
systems when test pressure is in excess of 0.5 psig. Pressure test the
gas supply piping system at pressures equal to or less than 0.5 psig.
The unit heating section must be isolated from the gas piping
system by closing the external main manual shutoff valve and
slightly opening the ground--joint union.
FIRE OR EXPLOSION HAZARD
Failure to follow this warning could result in personal injury,
death and/or property damage.
--Connect gas pipe to unit using a backup wrench to avoid
damaging gas controls.
--Never purge a gas line into a combustion chamber. Never
test for gas leaks with an open flame. Use a commercially
available soap solution made specifically for the detection of
leaks to check all connections. A fire or explosion may result
causing property damage, personal injury or loss of life.
--Use proper length of pipe to avoid stress on gas control
manifold.
--If a flexible connector is required or allowed by authority
having jurisdiction, black iron pipe shall be installed at
furnace gas valve and extend a minimum of 2 in. (51 mm)
outside furnace casing.
--If codes allow a flexible connector, always use a new
connector. do not use a connector which has previously
serviced another gas appliance.
!WARNING
8. Check for gas leaks at the field--installed and
factory--installed gas lines after all piping connections have
been completed. Use a commercially available soap solution
made specifically for the detection of leaks (or method
specified by local codes and/or regulations).
Step 9 — Install Duct Connections
The unit has duct flanges on the supply-- and return--air openings
on the side and bottom of the unit. For downshot applications, the
ductwork connects to the roof curb (See Fig. 2 and 3 for
connection sizes and locations).
Configuring Units for Downflow (Vertical) Discharge
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.
!WARNING
677C-- --C

9
1. Open all electrical disconnects before starting any service
work.
2. Remove horizontal (metal) duct covers to access vertical
(downflow) discharge duct knockouts in unit basepan. (See
Fig. 8.)
PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Collect ALL screws that were removed. Do not leave screws
on rooftop as permanent damage to the roof may occur.
CAUTION
!
3. For single--phase models only, on the discharge side only,
remove the insulation covering the downshot (plastic)
knockout. Insulation is held in place with aluminum tape.
Please note that large chassis units have 2 pieces of insula-
tion, and only the piece over the downshot knockout needs
to be removed. Discard insulation.
4. To remove the downshot (plastic) knockouts for both sup-
ply and returns, break front and right side connecting tabs
with a screwdriver and hammer. Push cover down to break
rear and left side tabs. These plastic knockouts are held in
place with tabs similar to an electrical knockout. Discard
plastic knockout covers.
5. Set unit on roof curb.
6. Verify that the downshot ducts are aligned with the down-
shot knockout areas.
7. Re--install horizontal (metal) covers as needed to seal unit.
Ensure opensings 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 horizontal duct installation (by
removing duct covers).
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.
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
A09061
Basepan
Downflow
(Vertical)
Supply
Knockout
Basepan
Downflow
(Vertical)
Return
Knockout
A09088
Fig. 8 -- Supply and Return Duct Opening
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Table 1 – Physical Data
Unit Size 24040 24060 30040 30060 36060 36090
Nominal Capacity --- ton 2 2 2.5 2.5 3 3
Shipping Weight (lb)
(kg)
365
166
365
166
395
179
395
179
440
200
440
200
Compressor / Quantity Scroll / 1
Refrigerant R---410A
Refrigerant Quantity (lb)
Quantity (kg)
7.5
3.4
7.5
3.4
9.0
4.1
9.0
4.1
8.9
4.0
8.9
4.0
Refrigerant Metering Device Indoor TXV, Outdoor Dual Accuraters
Orifice OD (in)
(mm)
0.032 (2)
0.81 (2)
0.032 (2)
0.81 (2)
0.035 (2)
0.89 (2)
0.035 (2)
0.89 (2)
0.040 (2)
1.02 (2)
0.040 (2)
1.02 (2)
Outdoor Coil
Rows…Fins/in,
face area (sq. ft.)
1…21
15.4
1…21
15.4
1…21
18.8
1…21
18.8
1…21
17.5
1…21
17.5
Outdoor Fan
Nominal Airflow (cfm)
Diameter (in.)
Diameter (mm)
Motor hp (rpm)
2500
24
610
1/12 (810)
2500
24
610
1/12 (810)
3000
24
610
1/10 (810)
3000
24
610
1/10 (810)
3500
26
660
1/5 (810)
3500
26
660
1/5 (810)
Indoor Coil
Rows…Fins/in,
face area (sq. ft.)
3…17
3.7
3…17
3.7
3…17
3.7
3…17
3.7
2…15
5.6
2…17
5.6
Indoor Blower
Nominal Airflow (cfm)
Size (in.)
Size (mm)
Motor hp
800
10 x 10
254 x 254
1/2
800
10 x 10
254 x 254
1/2
1000
10 x 10
254 x 254
1/2
1000
10 x 10
254 x 254
1/2
1200
11 x 10
279 x 254
1/2
1200
11 x 10
279 x 254
1/2
Furnace Section*
Burner Orifice
1---Phase Natural Gas Qty…Drill Size
1 --- P h a s e P r o p a n e G a s Q t y …Drill Size
3---Phase Natural Gas Qty…Drill Size
3 --- P h a s e P r o p a n e G a s Q t y …Drill Size
2…44
2…55
2…44
2…55
3…44
3…55
2…38
2…53
2…44
2…55
2…44
2…55
3…44
3…55
2…38
2…53
3…44
3…55
2…38
2…53
3…38
3…53
3…38
3…53
High Pressure Switch (psig)
Cutout
Reset (Auto)
650 +/--- 15
420 +/--- 25
Loss--- of--- Charge/Low Pressure Switch (psig)
Cutout
Reset (Auto)
2 0 + / --- 5
45 +/--- 10
Return Air Filters{}
disposable
2 each 20x12x1 in.
508x305x25 mm
1each24x16x1in.
610x406x25 mm
24x18x1 in.
510x457x25 mm
*Based on altitude of 0 to 2000 ft (0---610 m).
{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 to 350 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 filter rack installation instructions for correct filter size and quantity.
677C-- --C