Bryant 598B User Manual
installation and
start-up instructions
TWO-SPEED PURON® PLUS
AIR CONDITIONING UNIT
NOTE: Read the entire instruction manual before starting the
installation.
This symbol → indicates a change since the last issue.
598B
Cancels: II 598B-24-3 II 598B-24-4
5-03
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. 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 and National
Electrical Code (NEC) for special requirements.
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 would 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.
WARNING: Before installing, modifying, or servicing
system, main electrical disconnect switch must be in the
OFF position. There may be more than 1 disconnect
switch. Lock out and tag switch with a suitable warning
label. Electrical shock can cause personal injury or death.
CAUTION: Puron® (R-410A) systems operate at higher
pressures than standard R-22 systems. Be certain that
service equipment is rated for Puron®. Some R-22
service equipment may not be acceptable. Check with
your distributor.
INSTALLATION RECOMMENDATIONS
NOTE: In some cases noise in the living area has been traced to
gas pulsations from improper installation of equipment.
1. Locate unit away from windows, patios, decks, etc. where
unit operation sound may disturb customer.
2. Ensure that vapor and liquid tube diameters are appropriate
to capacity of unit.
-
O
S
P
W
E
T
•
E
D
•
™
.
A01050
Fig. 1—Model 598B
3. Run refrigerant tubes as directly as possible by avoiding
unnecessary turns and bends.
4. Leave some slack between structure and unit to absorb
vibration.
5. When passing refrigerant tubes through the wall, seal
opening with RTV or other pliablesilicon-basedcaulk. (See
Fig. 2.)
6. Avoid direct tubing contact with water pipes, duct work,
floor joists, wall studs, floors, and walls.
7. Do not suspend refrigerant tubing from joists and studs with
a rigid wire or strap which comes in direct contact with
tubing. (See Fig. 2.)
8. Ensure that tubing insulation is pliable and completely
surrounds vapor tube.
9. When necessary, use hanger straps which are 1 in. wide and
conform to shape of tubing insulation. (See Fig. 2.)
10. Isolate hanger straps from insulation by using metal sleeves
bent to conform to shape of insulation.
When outdoor unit is connected to factory-approved indoor unit,
outdoor unit contains system refrigerant charge for operation with
indoor unit of the same size when connected by 15 ft of
field-supplied or factory accessory tubing. For proper unit operation, check refrigerant charge using charging information located
on control box cover.
IMPORTANT: Maximum liquid-line size is 3/8-in. O.D. for all
residential applications.
IMPORTANT: Always install the factory-supplied Puron® air
conditioner liquid line filter drier. Obtain replacement filter driers
from your local distributor or branch.
—1—
Avoid contact between tubing and structureNOTE:
OUTDOOR WALL INDOOR WALL
CAULK
INSULATION
THROUGH THE WALL
HANGER STRAP
(AROUND VAPOR
TUBE ONLY)
1″ MIN.
SUSPENSION
LIQUID TUBE
VAPOR TUBE
JOIST
INSULATION
VAPOR TUBE
LIQUID TUBE
A01383
Fig. 2—Connecting Tubing Installation
INSTALLATION
I. CHECK EQUIPMENT AND JOB SITE
A. UNPACK UNIT
Move to final location. Remove carton, taking care not to damage
unit.
B. INSPECT EQUIPMENT
File claim with shipping company prior to installation if shipment
is damaged or incomplete. Locate unit rating plate on unit corner
panel. It contains information needed to properly install unit.
Check rating plate to be sure unit matches job specifications.
II. INSTALL ON A SOLID, LEVEL MOUNTING PAD
If conditions or local codes require the unit be attached to pad, tie
down bolts should be used and fastened through knockouts
provided in unit base pan. Refer to unit mounting pattern in Fig. 3
to determine base pan size and knockout hole location.
On rooftop applications, mount on level platform or frame. Place
unit above a load-bearing wall and isolate unit and tubing set from
structure. Arrange supporting members to adequately support unit
and minimize transmission of vibration to building. Consult local
codes governing rooftop applications.
CAUTION: Do not allow POE lubricant to come into
contact with roofing material. POE may deteriorate certain types of synthetic roofing.
Roof mounted units exposed to winds above 5 mph may require
wind baffles. Consult the Application Guideline and Service
Manual for Residential Split System Air Conditioners and Heat
Pumps using Puron® Refrigerant for wind baffle construction
NOTE: Unit must be level to within ±2° (±3/8 in./ft) per
compressor manufacturer specifications.
III. CLEARANCE REQUIREMENTS
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 30-in. clearance to
service end of unit and 48 in. above unit. For proper airflow, a 6-in.
clearance on 1 side of unit and 12 in. on all remaining sides must
be maintained. Maintain a distance of 24 in. between units.
Position so water, snow, or ice from roof or eaves cannot fall
directly on unit.
IV. OPERATING AMBIENTS
The minimum outdoor operating ambient in cooling mode is 55°F,
and the maximum outdoor operating ambient in cooling mode is
125°F.
C
L
3
⁄8 IN. DIA TIEDOWN
KNOCKOUTS
(2) PLACES
IN BASEPAN
8 3⁄16″
DIMENSIONS (IN.)
UNIT SIZE
024 19 X 24 2-13/16 6-15/16
036-060 26 X 32 4 9-3/4
MINIMUM MOUNTING
PAD DIMENSIONS
TIEDOWN KNOCKOUT
LOCATIONS
AB
Fig. 3—Mounting Unit to Pad
V. INSTALL TXV
Puron® fan coils and furnace coils come factory equipped with a
bi-flow, hard shut off TXV specifically designed for Puron®
two-speed units. No TXV changeout is required. An existing R-22
TXV must be replaced with a factory approved TXV specifically designed for Puron® two-speed units.
NOTE: FK4 and FC4 fan coils are equipped with an R-22 TXV.
If an FK4 or an FC4 fan coil is used with a Puron® air conditioner,
the R-22 TXV must be replaced with a factory-approved Puron®
TXV.
→
CAUTION: If indoor unit is equipped with piston,
remove indoor coil piston and replace with factory
approved TXV metering device.
A. TXV INSTALLATION
IMPORTANT: The TXV should be mounted as close to the
indoor coil as possible and in a vertical, upright position. Avoid
mounting the inlet tube vertically down. Valve is more susceptible
to malfunction due to debris if inlet tube is facing down. A factory
approved filter drier must be installed in the liquid line. (See Fig.
4.)
COIL
SENSING
BULB
EQUALIZER
TUBE
THERMOSTATIC
EXPANSION
VALVE
Fig. 4—TXV Installed
A
B
A97375
A91277
—2—
2. Remove coil access panel and fitting panel from front of
B
cabinet.
3. Remove TXV support clamp using the 5/16-in. nut driver.
Save the clamp.
INLET
D
A
COIL
E
BULB
INSULATION
TAPE
C
Fig. 5—TXV Kit Contents
INSTALLING TXV IN PLACE OF PISTON
1. Remove any existing refrigerant and ensure coil has not
been exposed to atmospheric pressure for more than 15
minutes.
2. Remove indoor coil inlet tube at piston body inlet. Use
back-up wrench to prevent damage.
3. Remove piston retainer, begin careful not to damage scaling
surface of O-ring.
4. Remove and discard factory-installed piston. (Replace retainer if O-ring is damaged.)
5. Reinstall piston retainer in piston body.
6. Replace indoor coil inlet tube. Use back-up wrench to
prevent damage.
CAUTION: To prevent damage to the unit, use a brazing
shield and wrap TXV with wet cloth.
A01418
4. Remove TXV using a backup wrench on flare connections
to prevent damage to tubing.
5. Using wire cutters, cut equalizer tube off flush with vapor
tube inside cabinet.
6. Remove bulb from vapor tube inside cabinet.
7. Braze equalizer stub-tube closed. Use protective barrier as
necessary to prevent damage to drain pan.
IMPORTANT: Route the equalizer tube of approved Puron®
TXV through suction line connection opening in fitting panel prior
to replacing fitting panel around tubing.
8. Install TXV with 3/8-in. copper tubing through small hole
in service panel. (See Fig. 5A.) To avoid damage to tubing
or valve, use wrench and backup wrench to attach TXV to
distributor.
9. Reinstall TXV support clamp (removed in item 3).
10. Attach TXV bulb to vapor tube inside cabinet, in same
location as original was when removed, using supplied bulb
strap. (See Fig. 5C.) See Fig. 6 for correct positioning of
sensing bulb.
11. Route equalizer tube through suction connection opening
(large hole) in fitting panel and install fitting panel in place.
12. Sweat inlet of TXV, marked “IN” to liquid line. Avoid
excessive heat which could damage valve.
13. Install vapor elbow with equalizer adapter to vapor line of
line set and vapor connection to indoor coil. (See Fig. 5B.)
Adapter has a 1/4-in. male connector for attaching equalizer
tube. (See Fig. 5B.)
14. Connect equalizer tube of TXV by 1/4-in. equalizer fitting,
on vapor line adapter. Use backup wrench to prevent
damage to equalizer fitting.
15. Proceed with the remainder of unit installation.
7. Sweat swivel adapter (see Fig. 5D) to inlet of indoor coil
and attach to TXV (see Fig. 5A) outlet. Use backup wrench
to avoid damage to tubing or valve. Sweat Inlet of TXV,
marked “IN” to liquid line. Avoid excessive heat which
could damage valve
8. Install vapor elbow (see Fig. 5B) with equalizer adapter to
suction tube of line set and suction connection to indoor
coil. Adapter has a 1/4-in. male connector or attaching
equalizer tube.
9. Connect equalizer tube of TXV to 1/4-in. equalizer fitting
on vapor line adapter.
10. Attach TXV bulb to horizontal section of suction line using
bulb straps provided. (See Fig. 5C.) Insulate bulb with
factory-supplied insulation tape. (See Fig. 5E.) See Fig. 6
for correct positioning of sensing bulb.
11. Proceed with remainder of unit installation.
REPLACING R-22 TXV OR NON-BALANCE PORT
PURON TXV
1. Remove any existing refrigerant and ensure coil has not
been exposed to atmospheric pressure for more than 15
minutes.
B. LONG-LINE APPLICATIONS
For refrigerant piping arrangements with equivalent lengths
greater than 50 ft or when elevation difference between indoor
and/or outdoor unit is more than 20 ft, follow all requirements of
the Long-Line Guideline section in the Application Guideline and
Service Manual for Residential Split-System Air Conditioners and
Heat Pumps Using Puron Refrigerant.
VI. MAKE PIPING CONNECTIONS
WARNING: Relieve pressure and recover all refrigerant
before system repair or final unit disposal to avoid
personal injury or death. Use all service ports and open all
flow-control devices, including solenoid valves.
CAUTION: Do not leave system open to atmosphere
any longer than minimum required for installation. POE
oil in compressor is extremely susceptible to moisture
absorption. Always keep ends of tubing sealed during
installation.
—3—
CAUTION: If ANY refrigerant tubing is buried, provide
6–in. vertical rise at service valve. Refrigerant tubing
lengths up to 36 in. may be buried without further special
consideration. Buried refrigerant tubing lengths greater
than 36 in. are NOT recommended.
SENSING BULB
STRAP
SUCTION
TUBE
CAUTION: To prevent damage to unit or service valves,
observe the following:
• Use a brazing shield.
• Wrap service valves with wet cloth or use a heat sink
material.
Outdoor units may be connected to indoor section using accessory
tubing package or field-supplied refrigerant grade tubing of correct
size and condition. Tubing diameters listed in Table 1 are adequate
for equivalent lengths up to 50 ft. For tubing requirements beyond
50 ft, substantial capacity and performance losses can occur.
Follow the recommendations in the Application Guideline and
Service Manual for Residential Split-System Air Conditioners and
Heat Pumps Using Puron® Refrigerant to minimize losses. Refer
to Table 1 for field tubing diameters. Refer to Table 2 for
accessory requirements.
If refrigerant tubes or indoor coil are exposed to atmosphere, they
must be evacuated to 500 microns to eliminate contamination and
moisture in the system.
TABLE 1—REFRIGERANT CONNECTIONS AND
RECOMMENDED LIQUID AND VAPOR TUBE
DIAMETERS (IN.)
UNIT
SIZE
024 3/8 3/8 5/8 5/8 5/8 3/4
036 3/8 3/8 3/4 3/4 3/4 7/8
048 3/8 3/8 7/8 7/8 7/8 7/8
060 3/8 3/8 7/8 1-1/8 7/8 1-1/8
Notes:
1. Tube diameters are for lengths up to 50 equivalent ft.
2. Do not apply capillary tube indoor coils to these units.
LIQUID VAPOR VAPOR (LONG-LINE)
Connection
Diameter
Tube
Diameter
Connection
Diameter
Tube
Diameter
Connection
Diameter
Tube
Diameter
A. OUTDOOR UNIT CONNECTED TO FACTORYAPPROVED INDOOR UNIT
Outdoor unit contains correct system refrigerant charge for operation with indoor unit of same size when connected by 15 ft of
field-supplied or factory-accessory tubing. Check refrigerant
charge for maximum efficiency
CAUTION: Installation of filter drier in liquid line is
required.
B. INSTALL LIQUID-LINE FILTER DRIER
Installation of filter drier in liquid line is required. Refer to Fig. 7
and install filter drier as follows:
1. Braze 5-in. connector tube to liquid service valve. Wrap
filter drier with damp cloth.
2. Braze filter drier between connector tube and liquid tube to
indoor coil. Flow arrow must point toward indoor coil.
C. REFRIGERANT TUBING
Connect vapor tube to fitting on outdoor unit vapor service valves.
Connect liquid tube to filter drier. (See Fig. 7 and Table 1.) Use
refrigerant grade tubing.
8 O'CLOCK
4 O'CLOCK
A02000
Fig. 6—Positioning of Sensing Bulb
CAUTION: To avoid valve damage while brazing, ser-
vice valves must be wrapped in heat-sink material, such
as a wet cloth.
D. SWEAT CONNECTION
Service valves are closed from factory and ready for brazing. After
wrapping service valve and filter drier with a wet cloth, braze
sweat connections using industry accepted methods and materials.
Do not use soft solder (materials which melt below 800°F).
Consult local code requirements. Refrigerant tubing and indoor
coil are now ready for leak testing. This check should include all
field and factory joints.
IMPORTANT: Check factory tubing on both indoor and outdoor
unit to ensure tubes are not rubbing against each other or any sheet
metal. Pay close attention to feeder tubes making sure wire ties on
feeder tubes are secure and tight.
E. LEAK CHECKING
Leak test all joints in indoor, outdoor, and refrigerant tubing.
F. EVACUATE REFRIGERANT TUBING AND INDOOR
COIL
CAUTION: Never use the system compressor as a
vacuum pump.
Refrigerant tubes and indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. The alternate
triple evacuation method may be used if the procedure outlined
below is followed. Always break a vacuum with dry nitrogen.
DEEP VACUUM METHOD
The deep vacuum method requires a vacuum pump capable of
pulling a vacuum of 500 microns and a vacuum gage capable of
accurately measuring this vacuum depth. The deep vacuum
method is the most positive way of assuring a system is free of air
and liquid water. (See Fig. 8.)
TRIPLE EVACUATION METHOD
The triple evacuation method should only be used when vacuum
pump is capable of pumping down to 28 in. of mercury and system
does not contain any liquid water. Refer to Fig. 9 and proceed as
follows:
1. Pump system down to 28 in. of mercury and allow pump to
continue operating for an additional 15 minutes.
2. Close service valves and shut off vacuum pump.
3. Connect a nitrogen cylinder and regulator to system and
open until system pressure is 2 psig.
4. Close service valve and allow system to stand for 1 hr.
During this time, dry nitrogen will be able to diffuse
throughout the system, absorbing moisture.
5. Repeat this procedure as indicated in Fig. 9. System will
then contain minimal amounts of contaminants and water
vapor.
—4—
CONNECTOR
TUBE
LIQUID-LINE
FILTER-DRIER
LIQUID
SERVICE
VALVE
5000
4500
4000
R
-
4
1
0
A
3500
LEAK IN
SYSTEM
3000
2500
2000
MICRONS
1500
1000
500
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
A95509
Fig. 7—Filter Drier with Sweat Adapter Tube
and Liquid Tube
G. FINAL TUBING CHECK
IMPORTANT: Check to be certain factory tubing on both indoor
and outdoor unit has not shifted during shipment. Ensure tubes are
not rubbing against each other or any sheet metal. Pay close
attention to feeder tubes, making sure wire ties on feeder tubes are
secure and tight.
VII. MAKE ELECTRICAL CONNECTIONS
WARNING: To avoid personal injury or death, do not
supply power to unit with compressor terminal box cover
removed.
Be sure field wiring complies with local and national fire, safety,
and electrical codes, and voltage to system is within limits shown
on unit rating plate. Contact local power company for correction of
improper voltage. See unit rating plate for recommended circuit
protection device.
NOTE: Operation of unit on improper line voltage constitutes
abuse and could affect unit reliability. See unit rating plate. Do not
install unit in system where voltage may fluctuate above or below
permissible limits.
NOTE: Use copper wire only between disconnect switch and
unit.
NOTE: Install branch circuit disconnect of adequate size per
NEC to handle unit starting current. Locate disconnect within sight
from and readily accessible from unit, per Section 440-14 of NEC.
A. ROUTE GROUND AND POWER WIRES
Remove access panel to gain access to unit wiring. Extend wires
from disconnect through power wiring hole provided and into unit
control box. Size wires per NEC but not smaller than minimum
wire size shown in Product Data Sheet.
WARNING: The unit cabinet must have as uninterrupted or unbroken ground to minimize personal injury if
an electrical fault should occur. The ground may consist
of electrical wire or metal conduit when installed in
accordance with existing electrical codes. Failure to
follow this warning can result in an electric shock, fire, or
death.
B. CONNECT GROUND AND POWER WIRES
Connect ground wire to ground connection in control box for
safety. Connect power wiring to leads provided as shown in Fig.
10.
01234567
MINUTES
A95424
A95424
Fig. 8—Deep Vacuum Graph
EVACUATE
BREAK VACUUM WITH DRY NITROGEN
WAIT
EVACUATE
BREAK VACUUM WITH DRY NITROGEN
WAIT
EVACUATE
CHECK FOR TIGHT, DRY SYSTEM
(IF IT HOLDS DEEP VACUUM)
CHARGE SYSTEM
A95425
Fig. 9—Triple Evacuation Method
C. CONNECT CONTROL WIRING
Route 24v control wires through control wiring grommet and
connect to leads provided in control box. (See Fig. 11.)
Use No. 18 AWG color-coded, insulated (35°C minimum) wire. If
thermostat is located more than 100 ft from unit, as measured
along the control voltage wires, use No. 16 AWG color-coded wire
to avoid excessive voltage drop.
All wiring must be NEC Class 1 and must be separated from
incoming power leads.
The outdoor unit requires a minimum of 27va, 24vac control
power.
IMPORTANT: Check factory wiring and wire connections to
ensure terminations are secured properly. Check wire routing to
ensure wires are not in contact with tubing, sheet metal, etc.
—5—
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