Page 1
163A / 165A
PREFERREDt SERIES AIR CONDITIONERS
WITH PURONRREFRIGERANT
1--1/2 TO 5 NOMINAL TONS (SIZE 018 TO 060)
Installation Instructions
TM
the environmentally sound refrigerant
Fig. 1 --- 163A / 165A
NOTE: Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS 2......................
INSTALLATION RECOMMENDATIONS 2............
INSTALLATION 3--9.14............................
Step 1 -- Check Equipment & Jobsite 3................
Step 2 -- Install on Solid Pad 3......................
Step 3 -- Clearance Requirements 3...................
Step 4 -- Operating Ambient 3.......................
Step 5 -- Install TXV 3 -- 4.........................
Step 6 -- Make Piping Connections 5 -- 7..............
Step 7 -- Make Electrical Connections 7 -- 8............
Step 8 -- Compressor Crankcase Heater 8..............
Step 9 -- Install Electrical Accessories 8..............
Step 10-- Check OCT and OAT thermistor Attachment 8..
Step 11 -- Start--Up 9..............................
Step 12 -- Check Charge 9, 14.......................
GENERAL SEQUENCE OF OPERATION 10...........
CONTROL FUNCTIONS AND SEQUENCE OF
OPERATION 10 -- 11................................
TROUBLESHOOTING 11 -- 12........................
FINAL CHECKS 13.................................
CARE AND MAINTENANCE 13......................
SUBCOOLING TABLE 14............................
24 VOLT CONNECTION DIAGRAMS 15 -- 16...........
PURONR REFRIGERANT QUICK REF. GUIDE 17.....
Page 2
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
163A / 165A
personal injury or death. WARNING sign ifies hazards wh ich
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.
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
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.
!
WARNING
WARNING
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 for unit capacity.
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 pliable silicon--based caulk.
(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.
Avoid contact between tubing and structureNOTE:
OUTDOOR WALL INDOOR WALL
CAULK
INSULATION
THROUGH THE WALL
HANGER STRAP
(AROUND VAPOR
TUBE ONLY)
LIQUID TUBE
VAPOR TUBE
JOIST
INSULATION
VAPOR TUBE
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal injury
or equipment damage.
PuronR refrigerant systems operate at higher pressures than
standard R-- 22 systems. Do not use R--22 service
equipment or components on Puron refrigerant equipment.
1” MIN.
SUSPENSION
Fig. 2 --- Connecting Tube Installation
Outdoor unit contains system refrigerant charge for operation
with ARI rated indoor unit when connected by 15 ft. of
field--su pplied or factory accessory tubing. For p ro p er unit
operation, check refrigerant charge using charging information
located on control box cover and/or in the Check Charge section
of this instruction.
IMPORTANT: Maximum liquid--line size is 3/8--in. OD for all
residential applications including long line.
IMPORTANT: Always install the factory--supplied liquid--line
filter drier. Obtain replacement filter driers from your distributor
or branch.
2
LIQUID TUBE
A94026
Page 3
INSTALLATION
Specifications for this unit in residential new construction market
require the outdoor unit, indoor unit, refrigerant tubing sets,
metering device, and filter drier listed in presale literature. There
can be no deviation. Consult the Application Guideline and
Service Manual – Air Conditioners and Heat Pumps Using
Puronr Refrigerant to obtain required unit changes for specific
applications and for R--22 retrofit.
STEP 1 —Check Equipment and Job Site
UNPACK
UNIT
Move to final location. Remove carton taking care not to damage
unit.
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.
STEP 2 —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.
For hurricane tie downs -- contact your local distributor for
details and PE (Professional Certification), if required by local
authorities.
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.
Roof mounted units exposed to winds may require wind baffles.
Consult the Application Guideline and Service Manual -Residential Split System Air Conditioners and Heat Pumps Using
Puronr Refrigerant for wind baffle construction.
NOTE: Unit must be level to within ±2_ (±3/8 in./ft.) per
compressor manufacturer specifications.
STEP 3 —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.
3/8 - -- IN. DIA. TIED OWN
KNOCKOUTS IN BASEPAN
(2) PLACES
VIEW FROM TOP
UNIT BASE PAN
DIMENSIONS
29--1/2 X 33 10–1/16 5–5/8 23–3/4
36–1/2 X 40 9–5/8 6–13/16 28–3/4
TIEDOWN KNOCKOUT LOCATIONS
A B C
A05177
Fig. 3 --- Tiedown Knockout Locations
On rooftop applications, locate unit at least 6 in. above roof
surface.
STEP 4 —Operating Ambient
The minimum outdoor operating ambient in cooling mode is
55_F, and the maximum outdoor operating ambient in cooling
mode is 125_F.
STEP 5 —Install TXV
NOTE: Applies to rated non--TXV and R--22 TXV indoor units
only. If installing a rated and approved indoor coil without a
factory installed PuronR TXV, remove and replace the fixed
orifice or R--22 TXV expansion device with a hard shutoff Puron
TXV.
The thermostatic expansion valve is specifically designed to
operate with Puron refrigerant. Do not use an R-- 22 TXV. An
existing R--22 TXV must be replaced with a factory-- approved
TXV specifically designed for Puron refrigerant. Refer to
Product Data Sheet for the appropriate TXV kit number.
!
CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Al indoor coil units must be installed with a hard shut
off PuronR TXV metering device.
163A / 165A
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.
3
Page 4
INSTALLINGTXVINPLACEOFPISTONINARA
INDOOR COIL
1. Pump system down to 2 psig and recover refrigerant.
2. Remove hex nut from piston body. Use backup wrench on
fan coils.
3. Remove and discard factory-- installed piston. Be sure
Teflon seal is in place.
4. Reinstall hex nut. Finger tighten nut plus 1/2 turn.
NOTE: If the piston is not removed from the body, TXV will
not function properly.
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Use a brazing shield and wrap TXV with wet cloth or
use heat sink material
163A / 165A
5. Install TXV on indoor coil liquid line. Sweat swivel
adapter to inlet of indoor coil and attach to TXV 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.
6. Install vapor elbow with equalizer adapter to suction tube
of line set and suction connection to indoor coil. Adapter
has a 1/4--in. male connector for attaching equalizer tube.
7. Connect equalizer tube of TXV to 1/4-- in. equalizer fitting
on vapor line adapter.
8. Attach TXV bulb to horizontal section of suction line
using clamps provided. Insulate bulb with field-- supplied
insulation tape. See Fig. 4 for correct positioning of
sensing bulb.
9. Proceed with remainder of unit installation.
10 O’CLOCK
(PRE-- 2006)
!
2O’CLOCK
CAUTION
SENSING BULB
TED
REPLACING TXV ON A RATED R--22 INDOOR
(PRE-- 2006)
1. Pump system down to 2 psig and recover refrigerant.
2. Remove coil access panel and fitting panel from front of
cabinet.
3. Remove TXV support clamp using a 5/16--in. nut driver.
Save the clamp.
4. Remove R--22 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 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. Use wrench and backup wrench, to avoid
damage to tubing or valve, 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 clamps (nylon or copper). See Fig. 4 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. Adapter has
a 1/4--in. male connector for attaching equalizer tube.
14. Connect equalizer tube of TXV to 1/4-- in. equalizer fitting
on vapor line adapter. Use backup wrench to prevent
damage to equalizer fitting.
15. Proceed with remainder of unit installation.
COIL
SUCTION TUBE
7/8
IN. OD & SMALLER
Fig. 4 --- Position of Sensing Bulb
STRAP
8O’CLOCK 4O’CLOCK
LARGER THAN 7/8 IN. OD
A81032
4
Page 5
STEP 6 —Make Piping Connections
!
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could result in personal
injury or death.
Relieve pressure and recover all refrigerant before
system repair or final unit disposal.
Use all service ports and open all flow--control
devices, including solenoid valves.
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
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.
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
If ANY refrigerant tubing is buried, provide a 6 in. vertical
rise at service valve. Refrigerant tubing lengths up to 36 in.
may be buried without further special consideration. Do
not bury lines longer than 36 in.
WARNING
CAUTION
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
To prevent damage to unit or service valves observe the
following:
S Use a brazing shield.
S Wrap service valves with wet cloth or use a heat sink
material.
Outdoor units may be connected to indoor section using
accessory tubing pack age o r field-- supplied refrigerant grade
tubing of correct size and condition. Rated tubing diameters
shown in Table 1 recommended up to 80 ft. See Product Data
for acceptable alternates vapor diameters and associated capacity
losses. For tubing requirements beyond 80 ft., substantial
capacity and p erforman ce losses can occur. Follo win g the
recommend ation s in the Longline Guidelin e -- R esiden tial
Split--System Air Conditioners and Heat Pumps Using Puronr
Refrigerant will reduce these losses. Refer to Table 1 for field
tubing diameters. Refer to Table 2 for accessory requirements.
There are no buried--line applications greater than 36 in.
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.
OUTDOOR UNIT CONNECTED TO FACTOR
APPROVED INDOOR UNIT
Outdoor unit contains correct system refrigerant charge for
operation with factory approved ARI rated indoor unit when
connected by 15 ft. of field--supplied or factory--accessory tubing,
and factory su p p lied filter d rier. Ch eck refrigerant charge for
maximum efficiency.
CAUTION
Y--
:
163A / 165A
Table 1—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (In.)
LIQUID
UNIT SIZE
Connection
Diameter
018, 024
030, 036
042, 048
060
Notes:
1. Tube diameters are for total equivalent lengths up to 80 ft..
2. Do not apply capillary tube or fixed orifice indoor coils to these units.
* For Tubing Set lengths between 80 and 200 ft. horizontal or 20 ft. vertical differential (250 ft. Total Equivalent Length), refer to the Longline Guide l i n e --- A i r
Conditioners and Heat Pumps using Puron refrigerant.
3/8 3/8 5/8 5/8
3/8 3/8 3/4 3/4
3/8 3/8 7/8 7/8
3/8 3/8 7/8 1-- 1/8
Tube
Diameter
Connection
Diameter
VA P O R
(up to 80 ft. *)
Rated Tube
Diameter
5
Page 6
Table 2—Accessory Usage
REQUIRED FOR LOW---AMBIENT
Accessory
Crankcase Heater Yes Yes
Evaporator Freeze Thermostat
Winter Start Control
Thermal Expansion Valve (TXV)
Hard Shutoff
Compressor Start Assist Capacitor and Relay Yes
Low---ambient Pressure Switch
Support Feet Recommended
Liquid Line Solenoid Valve No See Long--- Line Application Guideline
* For Tubing Set lengths between 80 and 200 ft. horizontal or 20 ft. vertical differential (250 ft. Total Equivalent Length), refer to the Longline
Guideline --- Air Conditioners and Heat Pumps using Puron refrigerant.
INSTALL LIQUID--LINE FILTER DRIER INDOOR
163A / 165A
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment damage
or improper operation.
Installation of filter drier in liquid line is required.
CAUTION
APPLICATIONS
(0°FTo55°F)
Yes
(For non---Evolution systems only)
Yes
(For non---Evolution systems only)
Yes
Yes
(For non --- Evolution system only)
REFRIGERANT TUBING CONNECTION
Conn ect vap o r tub e to fitting o n o u tdoor unit vapor service
valves (see Table 1.) Connect and braze the 3/8 ” cou p lin g
(provided with the filter drier) to the liquid service valve and
connect and b raze the liqu i d tu b ing to the other end of this
coupling. Use refrigerant grade tubing.
SWEAT
CONNECTION
!
REQUIRED FOR LONG LINE
APPLICATIONS* (Over 80 ft.)
No
No
Yes
Yes
No
No
CAUTION
OUTDOOR
!
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Filter drier must be wrapped in a heat---sinking material
such as a wet cloth while brazing.
Refer to Fig. 5 and install filter drier as follows:
1. Braze 5--in. liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to above 5” liquid tube. Flow arrow
must point towards indoor coil.
4. Connect and braze liquid refrigerant tube to the filter drier.
Fig. 5 --- Liquid Line Filter Drier
A05178
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Service valves must be wrapped in a heat-- sinking
material such as a wet cloth.
Service valves are closed from factory and ready for brazing.
After wrapping service valve with a wet cloth, braze sweat
connections using industry accepted m ethods and materials.
Consult local code requirements. Refrigerant tubing and indoor
coil are now ready for leak testing. This check should include all
field and factory joints.
EVACUATE REFRIGERANT TUBING AND
COIL
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
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. An alternate
triple ev acuatio n method may b e u sed if t he deep vacu um
procedure is not followed.
IMPORTANT: Always break a vacuum with dry nitrogen.
CAUTION
INDOOR
6
Page 7
DEEP VACUUM
T
M
ICRON
S
The deep vacuum method requires a vacuum pump capable of
pulling a vacuum of 500 microns and a vacuum gage capable of
accurately measu r in g this vacuu m depth. Th e deep vacuu m
method is the most positive way of assuring a system is free of air
and liquid water. (See Fig. 6)
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
TRIPLE EVACUATION
The triple evacuation method should be used when vacuum
pump is only capable of pumping down to 28 in. of mercury
vacuum and system does not contain any liquid water. Refer to
Fig. 7 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. 7. System will
then be free of any contaminants and water vapor .
METHOD
LEAK IN
SYSTEM
VACUUM TIGH
TOO WET
TIGHT
DRY SYSTEM
01234567
MINUTES
Fig. 6 --- Deep Vacuum Graph
METHOD
A95424
A95424
EVACUATE
BREAK VACUUM WITH DRY NITROGEN
WAIT
EVACUATE
FINAL TUBING
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.
STEP 7 —Make Electrical Connections
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in 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.
ROUTE GROUND AND POWER
Remove access panel to gain access to unit wiring. Extend wires
from disconnect through power wiring hole provided and into
unit control box.
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
The unit cabinet must have an 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.
CHECK
WARNING
WIRES
WARNING
163A / 165A
BREAK VACUUM WITH DRY NITROGEN
WAIT
EVACUATE
CHECK FOR TIGHT, DRY SYSTEM
(IF IT HOLDS DEEP VACUUM)
CHARGE SYSTEM
Fig. 7 --- Triple Evacuation Method
A95425
7
Page 8
CONNECT GROUND AND POWER
WIRES
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 8.
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
CONTACTOR
FIELD POWER
WIRING
FIELD GROUND
WIRING
GROUND
LUG
A91056
Fig. 8 --- Line Power Connections
STEP 10 —Check OA T Thermistor and OCT Thermistor
Attachments
Outdoor Air Temperature (OAT) Thermistor is factory installed
by inserting the nibs on either sides of the thermistor body
through a keyhole in the bottom shelf of the control box and
locking it in place by turning it 90 degrees, such that the spherical
end of a nib faces the front of the control box.
Check to make sure the OAT is locked in place. See Fig. 9.
OAT Thermistor must be locked in
place with spherical nib end facing towards the front of the control box
CONNECT CONTROL
WIRING
Route 24--v control wires through control wiring grommet and
connect leads to control wiring. (See Fig. 13 & Fig. 14)
163A / 165A
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,
insulated wire to avoid excessive voltage drop.
All wiring must be N E C Class 1 and mu st be separated from
incoming power leads.
Use furnace transformer, fan coil tran sformer, or accessory
transformer for control power, 24--v/40-- va minimum.
NOTE: Use of available 24--v accessories may exceed the
minimum 40--va power requirement. Determine total transformer
load and increase the transformer capacity or split the load with
an accessory transformer as required.
FINAL WIRING
CHECK
IMPORTANT: Check factory wiring and field wire connections
to ensure terminations are secured properly. Check wire routing
to ensure wires are not in contact with tubing, sheet metal, etc.
STEP 8 —CompressorCrankcaseHeater
When equipped with a crankcase heater, furnish power to heater a
minimum of 24 hr before starting unit. To furnish power to heater
only, set therm o stat to OFF and close electrical d isco nnect to
outdoor unit.
A crankcase heater is required for low--ambient cooling or if
refrigerant tubing is longer than 80 ft. Refer to the Longline
Guideline Section -- Residential Split--System Air Conditioners
and Heat Pumps Using Puronr Refrigerant.
STEP 9 —Install Electrical Accessories
Refer to the individual instructions packaged with kits or
accessories when installing.
A06313
Fig. 9 --- Outdoor Air Thermistor (OAT) Attachment
The Outdoor Coil Temperature (OCT) Thermistor is factory
installed on the liquid tube between the coil assembly and the
liquid service valve. See Fig. 10.
Check to make sure the thermistor is securely attached on the
liquid tube with the clip as shown in Fig. 10.
OCT Thermistor must be secured tight
on the liquid tube.
A05409
Fig. 10 --- Outdoor Coil Thermistor (OCT) Attachment
8
Page 9
STEP 11 —Start--Up
!
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in minor personal
injury, equipment damage or improper operation.
To prevent compressor damage or personal injury, observe the
following:
S Do not overcharge system with refrigerant.
S Do not operate unit in a vacuum or at negative pressure.
S Do not disable low pressure switch in scroll compressor
applications.
S Dome temperatures may be hot.
!
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal
injury.
Wear safety glasses, protective clothing, and gloves when
handling refrigerant and observe the following:
S Front seating service valves are equipped with Schrader
valves.
!
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
damage.
Federal regulations require that you do not vent refrigerant
to the atmosphere. Recover during system repair or final
unit disposal.
FOLLOW THESE STEPS TO PROPERLY START
THE
SYSTEM:
1. After system is evacuated, fully open liquid and vapor
service valves.
2. Unit is shipped with valve stem(s) front seated (closed)
and caps installed. Open fully by turning the stem counter
clockwise as far as it will go, and tighten lightly. This
opens the valve to refrigerant flow, and closes the gage
port. To leave gage port open, fully open the valve, and
then turn the stem clockwise a few turns. This will allow
pressure to be sensed without restricting refrigerant flow.
Replace stem caps after system is opened to refrigerant
flow. Replace caps finger--tight and tighten with wrench
an additional 1/12 turn.
NOTE: The gage port does not contain a Schrader core.
3. Close electrical disconnects to energize system.
4. Set room thermostat at desired temperature. Be sure set
point is below indoor ambient temperature.
5. Set room thermostat to COOL and fan control to ON or
AUTO mode, as desired. Operate unit for 15 minutes.
Check system refrigerant charge.
STEP 12 —Check Charge
CHARGE
UNIT
Factory charge and charging methods are shown on unit
information plate. Charge Puron refrigerant units with cylinder in
uprigh t position and a commercial -- ty p e m eterin g device in
manifold hose. Charge refrigerant into suction line.
CAUTION
CAUTION
CAUTION
UP
NOTE: If subcooling charging conditions are not favorable,
charge must be weighed in accordance with unit rating plate, ±0.6
oz/ft. of 3/8--in. liquid line above or below 15 ft., respectively.
Favorable conditions fall within the ranges given on the charging
chart on the outdoor unit plate.
NOTE: In longline applications, see Application Guideline for
special charging requirements.
EXAMPLE:
To calculate additional charge required for a 25 ft. line set:
25 ft. -- 15 ft. = 10 ft. X 0.6 oz/ft. = 6 oz. of additional charge.
COOLING ONLY
This system requires charging by the subcooling method.
1. Operate unit a minimum of 10 minutes before checking
charge.
2. Measure liquid service valve pressure by attaching an
accurate gage to service port.
3. Measure liquid line temperature by attaching an accurate
thermistor type or electronic thermometer to liquid line
near outdoor coil.
4. Refer to unit rating plate for required subcooling
temperature.
5. Refer to Table 4. Find the point where required subcooling
temperature intersects measured liquid service valve
pressure.
6. To obtain required subcooling temperature at a specific
liquid line pressure, add refrigerant if liquid line
temperature is higher than indicated or reclaim refrigerant
if temperature is lower. Allow a tolerance of ±3_F.
MAJOR
Control Board
The AC control board controls the following functions:
COMPONENTS
PROCEDURE
S Compressor contactor operation
S Outdoor fan motor operation
S Compressor external protection
S Pressure switch monitoring
S Time Delays
Field Connections
When used with a standard thermostat, it is recommended to use
3 thermostat control wires to be connected to R, Y and C. When
using 3 wires, all diagnostic and time delay features are enabled
(See Fig. 15).
When only 2 thermostat co nt rol wires are available, units
beginning with serial number 3006E and newer will function, but
some control features are lost. (See Fig. 16). With only 2 wires
connected, the circuit board will be powered down whenever
there is no call for cooling, and the following will result:
S Compressor time delay is reduced from 5 minutes to 10
seconds
S When the thermostat is not calling for cooling, the
amber status light will be off, and no diagnostics codes
will be available
S All system counters will be reset on each new call for
cooling
When using Evolution Communicating control, 4 wires are
required to be connected to the ABCD terminal (see Fig. 14)
Compressor Internal Relief
The compressor is protected by an internal pressure relief (IPR)
which relieves discharge gas into the compressor shell when
differential b etw een suction and discharge p ressure exceeds
550--625 psi. The compressor is also protected by an internal
overload attached to motor windings.
163A / 165A
9
Page 10
GENERAL SEQUENCE OF OPERATION
STANDARD THERMOSTAT
Turn on power to indoor and outdoor units. Transformer is
energized.
On a call for cooling, thermostat makes circuits R--Y and R--G.
Circuit R--Y energizes contactor, starting outdoor fan motor and
compressor circuit. R--G energizes indoor unit blower relay,
starting indoor blower motor on high speed.
NOTE: To achieve the rated system performance, the indoor unit
or the thermostat must be equipped with a time delay relay
circuit.
When thermostat is satisfied, its contacts open, de--energizing
contactor and blower relay. Compressor and motors stop. If
indoor unit is equipped with a time--delay relay circuit, the indoor
blower will run an additional 90 sec to increase system efficiency.
CONTROL FUNCTIONS
AND SEQUENCE OF OPERATION
The outdoor unit control system has special functions. The
following is an overview of the control functions.
163A / 165A
SEQUENCE OF OPERATION
COOLING OPERA
This product utilizes either a standard indoor thermostat or
Evolution communication User Interface. With a call for cooling,
the outdoor fan and compressor are energized. When the cooling
demand is satisfied, the compressor and fan will shut off.
NOTE: The outdoor fan motor will continue to operate for one
minute after compressor shuts off, when the outdoor ambient is
greater than or equal to 100 degrees F.
COMMUNICATION AND STATUS FUNCTION
Green Communications (COMM) Light (Evolution Control
only):
A g reen LED (COMM light) on the outdoor board indicates
successful communication with the other system products. The
green LED will remain OFF until communications is established.
Once a valid command is received, the green LED will turn ON
continuously. If no communication is received within 2 minutes,
the LED will be turned OFF until the next valid communication.
Amber Status Light
An amber colored STATUS light is used to display the operation
mode and fault codes as specified in the troubleshooting section.
See Table 3 for codes and definitions.
NOTE: Only one fault code will be displayed on the outdoor
unit control board (the most recent, with the highest priority).
CRANKCASE HEATER OPERA
The crankcase heater (when applicable) is energized during the
off cycle below 65 degrees F.
OUTDOOR FAN MOTOR OPERA
The outdoor unit control energizes outdoor fan any time the
compressor is operating. The outdoor fan remains energized for
15 minutes if a pressure switch or compressor thermal protector
should open. Outdoor fan motor will continue to operate for one
minute after the compressor shuts off when the outdoor ambient
is greater than or equal to 100 degrees F.
TION
TION
TION
LIGHTS
TIME DELAYS
The unit time delays include:
S Five minute time delay to start cooling operation when
there is a call from the thermostat or user interface
(there is no bypass of this feature in a
non--communicating system, in a communicating
system push the UI fan and up buttons simultaneously
for approximately 10 seconds)
S When operating the unit with 2 wires, this delay is
shortened to 10 seconds.
S Five minute compressor recycle delay on return from a
brown out condition
S Two minute time delay to return to standby operation
from last valid communications (with Evolution only)
S One minute time delay of outdoor fan at termination of
cooling mode when outdoor ambient is greater than or
equal to 100 deg F
UTILITY INTERF
With Evolution Control
The input labeled UTIL is active only when a communicating
Evolution Control is used. This input allows a power utility
device to interrupt compressor operation during peak load
periods. See figure below for wiring connections. When the
utility sends a signal to shut the system down, the User Interface
will display ”CURTAILMENT ACTIVE”.
With Non--Communicating Thermostats
When the utility curtailment interface is used with a
non-- communicating thermostat, the utility relay should be wired
in series with the Y input.
LOW AMBIENT
When this unit is required to operate below 55_F to a minimum
of 0_F outdoor temperature, provisions must be made for low
ambient operation.
Low ambient cooling operation can be accomplished two ways
depending on the control system:
ACE
EVOLUTION BOARD
UTIL
R
UTILITY RELAY
UTILITY SIGNAL
OPEN RELAY
*
SUPPLIED BY UTILITY PROVIDER
Fig. 11 --- Utility Interface
COOLING
*
A05410
S Complete Evolution System
S Standard non-- communicating thermostat
10
Page 11
Evolution Controlled low ambient cooling:
This unit is capable of low ambient cooling without a kit ONLY
when using a complete Evolution system. A low ambient kit is
not required, and the outdoor fan motor does not need to be
replaced for Evolution controlled low ambient operation. The
Evolution Control provides an automatic evaporator coil freeze
protection algorithm that eliminates the th e need for an
evaporator freeze thermostat. Low ambient cooling must be
enabled in the User Interface set up. Fan may not begin to cycle
until about 40_F OAT. Fan will cycle based on coil and outdoor
air tem p erature. A crankcase h eater must
Product Data for accessory part numbers on appropriate unit size
and series.
Evolution controlled low ambient mode operates as follows:
be installed. See
S Fan is OFF when outdoor coil temp is < (outdoor air
temperature + 3 _F) or outdoor fan has been ON for 30
minutes. (Fan is turned off to allow refrigerant system
to stabilize.)
S Fan is ON when outdoor coil temp > (outdoor air
temperature + 25_F) or outdoor coil temp > 80_Forif
outdoor fan has been OFF for 30 minutes. (Fan is
turned on to allow refrigerant system to stabilize.)
S Low pressure switch is ignored for first 3 minutes
during low ambient start up. After 3 minutes, if LPS
trips, then outdoor fan motor is turned off for 10
minutes, with the compressor running. If LPS closes
within 10 minutes then cooling continues with the
outdoor fan cycling per the coil temperature routine
listed above for the remainder of the cooling cycle. If
the LPS does not close within 10 minutes, then the
normal LPS trip response (shut down cooling operation
and generate LPS trip error) will occur.
Standard Thermostat low ambient cooling mode:
The following option al accessories mu st be installed for low
ambient operation in standard thermostat mode:
S Low Ambient Pressure Switch Kit
S Evaporator Freeze Thermostat
S Winter Start Control
S Crankcase Heater
The fan motor is a ball bearing type and does not need to be
changed. A crankcase heater must
for accessory part numbers on appropriate unit size and series
units.
be installed. See Product Data
TROUBLESHOOTING
SYSTEMS COMMUNICATION FAILURE
If communication between outdoor unit, control board, and
indoor user interface control has failed, the control will flash the
appropriate fault code. (See table 3) Check the wiring to the UI,
indoor and outdoor units.
PRESSURE SWITCH
The outdoor unit is equipped with high-- and low--pressure
switches. If the control senses the opening of a high or
low--p ressure switch, it will d e--en ergize the comp ressor
contactor, keep the outdoor fan operating for 15 minutes and
display the appropriate fault code. (See table 3)
After a 15 minute delay, if there is still a call for cooling, and the
LPS or HPS is reset, the compressor contactor is energized. If the
LPS or HPS has not closed after a 15 minute delay, the outdoor
fan is turned off. If the open switch closes anytime after the
15--minute delay, then the unit will resume operation with a call
for cooling.
PROTECTION
If the LPS or HPS trips for five consecutive cycles, then unit
operation is locked out for 4 hours and the appropriate fault code
(See table 3) is displayed.
In the ev en t of a hig h -- pressure switch trip or high--pressure
lockout, check the refrigerant charge, outdoor fan operation and
outdoor coil for airflow restrictions.
In the event of a low-- pressure switch trip or low--pressure
lockout, check the refrigerant charge and indoor airflow.
CONTROL FAUL
If the outdoor unit control board has failed, the control will flash
the appropriate fault code. (See table 3) The control board should
be replaced.
24V BROWN OUT
If the control voltage is less than 15.5volts for at least 4 seconds,
the compresso r contacto r and fan relay are de--energized .
Compressor and fan operation are not allowed until control
voltage is a minimum of 17.5volts. The control will flash the
appropriate fault code. (See table 3) Verify the control voltage is
in the allowable range of 18-- 30volts.
COMPRESSOR VOLTAGE
The input terminals labeled VR and VS on the control board (see
Fig. 13) are used to detect compressor voltage status, and alert the
user of potential problems. The control continuously monitors the
high voltage on the run capacitor of the compressor motor.
Voltage should be present any time the compressor contactor is
energized, and voltage should not be present when the contactor
is de-- energized.
COMPRESSOR THERMAL CUTOUT OR LOSS OF
POWER
If the control senses the compressor voltage after start--up, and is
then absent for 10 consecutive seconds while cooling demand
exists, it will de--energize the compressor contactor, k eep the
outdoor fan operating for 15 minutes (if 230v power present) and
display the appropriate fault code. (See table 3) Possible causes
are compressor internal overload trip or loss of high voltage
(230V) to compressor without loss of control voltage.
After a 15 minute delay, if there is still a call for cooling, the
compressor contactor is energized. If the thermal protector has
not re--set, the outdoor fan is turned off. If the call for cooling
continues, the control will energize the compressor contactor
every 15 minutes. If the thermal protector closes, (at the next 15
minute interval check), the unit will resume operation.
If the thermal cutout trips for three consecutive cycles, then unit
operation is locked out for 4 hours and the appropriate fault code
(See Table 3) is displayed.
CONTACTOR SHORTED
If there is compressor voltage sensed when there is no demand for
compressor operation, the contactor may be stuck closed. The
control will flash the appropriate fault code. Check the contactor
and control box wiring.
NO 230V AT
If the compressor voltage is not sensed when the compressor
should be starting, the contactor may be stuck open or the unit
disconnect or circuit breaker may be open. The control will flash
the appropriate fault code. Check the contactor, unit disconnect
or circuit breaker and control box wiring.
TEMPERATURE THERMIST
Thermistors are electronic devices which sense temperature. As
the temperature increases, the resistance decreases. Thermistors
are used to sense outdoor air (OAT) and coil temperature (OCT).
If the outdoor air or coil thermistor should fail, the control will
flash the appropriate fault code. (See table 3)
T
PROTECTION
SENSING
230V
DETECTION
COMPRESSOR
ORS
163A / 165A163A / 165A
11
Page 12
IMPORTANT: The outdoor air thermistor and coil thermistor
are factory mounted in the correct locations. Do not re--locate
thermistor sensors.
THERMISTOR SENSOR COMP
ARISON
The control continuously monitors and compares the outdoor air
temperature sensor and outdoor coil temperature sensor to ensure
proper operating conditions. The comparison is, if the outdoor air
sensor indicates ≥10 _F warmer than the coil sensor (or) the
outdoor air sensor indicates ≥20_F cooler than the coil sensor, the
sensors are out of range.
If the sensors are out of range, the control will flash the
appropriate fault code. (See Table 3)
The thermistor comparison is not performed during low ambient
cooling.
FAILED THERMISTOR DEFAULT OPERA
TION
Factory defaults have been provided in the event of failure of
outdoor air thermistor and/or coil thermistor.
If the OAT sensor should fail, low ambient cooling will not be
allowed, and the one minute outdoor fan off delay will not occur.
If the OCT sensor should fail, low ambient cooling will not be
163A / 165A
allowed.
Thermistor Curve: The resistance vs. temperature chart shown in
Figure 12 enables the technician to check the outdoor air and
OPERATION FAULT
Standby – no
call for unit
operation
Standby – no
call for unit
operation
Cooling
Operation
None On solid, no flash Normal operation --- 3 thermostat wires or 4 wire Evolution Control
None Off
None
System
Communications
Failure
High Pressure Switch
Open
Low Pressure Switch
Open
Control Fault 45
Brown Out
(24 v)
Outdoor Air Temp
Sensor Fault
Outdoor Coil Sensor
Thermistors out of
range
Thermal Cutout 72
Contactor Shorted
No 230V at Compres-
Thermal Lockout
Low Pressure Lockout 83
High Pressure Lock-
Fault
sor
out
AMBER LED
FLASH CODE
1, pause
outdoor coil thermistors for proper resistance. Unplug the
thermistor assembly from the circuit board and measure resistance
across each thermistor. For example, if the outdoor temperature is
60ºF, the resistance reading across the outdoor air thermistor
should be around 16,000 Ohms.
STATUS
CODES
Table 3 shows the status codes flashed by the amber status light.
Most system problems can be diagnosed by reading the status
code as flashed by the amber status light on the control board.
The codes are flashed by a series of short and long flashes of the
status light. The short flashes indicate the first digit in the status
code, followed by long flashes indicating the second digit of the
error code. The short flash is 0.25 second ON and the long flash
is 1.0 second ON. Time between flashes is 0.25 second. Time
between short flash and first long flash is 1.0 second. Time
between code repeating is 2.5 seconds with LED OFF.
Count the number of short and long flashes to determine the
appropriate flash code. Table 3 gives possible causes and actions
related to each error.
Example: 3 short flashes followed by 2 long flashes indicates a
32 code. Table 3 shows this to be low pressure switch open.
Table 3— Status Codes
Possible Cause and Action
Normal operation --- No call for cooling with 2 --- wire connection or indoor
unit not powered.
Normal operation
16 Communication with user interface lost. Check wiring to UI, indoor and
31
32
46
53 Outdoor air sensor not reading or out of range. Ohm out sensor and
55
56 Improper relationship between coil sensor and outdoor air sensor. Ohm
73 Compressor voltage sensed when no demand for compressor operation
74
82 Thermal cutout occurs in three consecutive cycles. Unit operation locked
84
outdoor units
High pressure switch trip. Check refrigerant charge, outdoor fan opera-
tion and coils for airflow restrictions.
Low pressure switch trip. Check refrigerant charge and indoor air flow
Outdoor unit control board has failed. Control board needs to be re-
placed.
The control voltage is less than 15.5v for at least 4 seconds. Compressor
and fan operation not allowed until control voltage is a minimum of 17.5v.
Verify control voltage.
check wiring
Coil sensor not reading or out of range. Ohm out sensor and check wiring
out sensors and check wiring.
Compressor voltage sensed after start---up, then absent for 10 consecutive seconds while cooling demand exists. Possible causes are internal
compressor overload trip or loss of high voltage to compressor without
loss of control voltage. The control will continue fan operation and wait
15 minutes to attempt a restart. Fault will clear when restart is successful,
or low voltage power is cycled.
exists. Contactor may be stuck closed or there is a wiring error.
Compressor voltage not sensed when compressor should be starting.
Disconnect may be open or contactor may be stuck open or there is a
wiring error.
out for 4 hours or until 24v power recycled.
Low pressure switch trip has occurred during 5 consecutive cycles. Unit
operation locked out for 4 hours or until 24v power recycled.
High pressure switch trip has occurred during 5 consecutive cycles. Unit
operation locked out for 4 hours or until 24v power recycled.
12
Page 13
THERMISTOR CURVE
90
80
70
60
50
40
30
20
RESISTANCE (KOHMS)
10
0
0 20 40 60 80 100 120
Fig. 12 --- Resistance vs Temperature Chart
TEMPERATURE (DEG. F)
A91431
163A / 165A
COMM STATUS
Fig. 13 --- Single--Stage Control Board
FINAL CHECKS
IMPORTANT: Before leaving job, be sure to do the following:
1. Ensure that all wiring is routed away from tubing and
sheet metal edges to prevent rub--through or wire
pinching.
2. Ensure that all wiring and tubing is secure in unit before
adding panels and covers. Securely fasten all panels and
covers.
3. Tighten service valve stem caps to 1/12-- turn past finger
tight.
4. Leave Owner’s Manual with owner. Explain system
operation and periodic maintenance requirements outlined
in manual.
}
Outdoor Coil Temp (OCT)
Outdoor Air Temp (OAT)
}
A06134
5. Fill out Dealer Installation Checklist and place in
customer file.
CARE AND MAINTENANCE
For continuing high performance and to minimize possible
equipment failure, periodic maintenance must be performed on
this equipment.
Frequency of maintenance may vary depending upon geographic
areas, such as coastal applications. See Ow n er’s Manual for
information.
13
Page 14
Table 4—Required Liquid ---Line Temperature (°F)
163A / 165A
LIQUID
PRESSURE
AT SER-
VICE VALVE
(PSIG)
189 58 56 54 52 50 48
195 60 58 56 54 52 50
202 62 60 58 56 54 52
208 64 62 60 58 56 54
215 66 64 62 60 58 56
222 68 66 64 62 60 58
229 70 68 66 64 62 60
236 72 70 68 66 64 62
243 74 72 70 68 66 64
251 76 74 72 70 68 66
259 78 76 74 72 70 68
266 80 78 76 74 72 70
274 82 80 78 76 74 72
283 84 82 80 78 76 74
291 86 84 82 80 78 76
299 88 86 84 82 80 78
308 90 88 86 84 82 80
317 92 90 88 86 84 82
326 94 92 90 88 86 84
335 96 94 92 90 88 86
345 98 96 94 92 90 88
354 100 98 96 94 92 90
364 102 100 98 96 94 92
374 104 102 100 98 96 94
384 106 104 102 100 98 96
395 108 106 104 102 100 98
406 110 108 106 104 102 100
416 112 110 108 106 104 102
427 114 112 110 108 106 104
439 116 114 112 110 108 106
450 118 116 114 112 110 108
462 120 118 116 114 112 110
474 122 120 118 116 114 112
486 124 122 120 118 116 114
499 126 124 122 120 118 116
511 128 126 124 122 120 118
8 10 12 14 16 18
REQUIRED SUBCOOLING TEMPERATURE (°F)
14
Page 15
Single Stage AC
Fig. 14 --- Evolution Control Four--Wire Connection Wiring Diagrams
(See Thermostat Installation Instructions for specific unit combinations)
A06087
163A / 165A
LEGEND
24--V FACTORY WIRING
24--V FIELD WIRING
FIELD SPLICE CONNECTION
A97368
Fig. 15 --- Non--Communicating Standard Thermostat 3--Wire 24V Circuit Connections
(See Thermostat Installation Instructions for Specific Unit combinations)
!
CAUTION
ELECTRICAL OPERATION HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
A minimum of three wire thermostat wiring is
required for the system to operate.
A06305
15
Page 16
TYPICAL FURNACE
A/C THERMOSTAT
A/C THERMOSTAT AIR CONDITIONER
or
FAN COIL
AIR CONDITIONER
24VAC HOT
24VAC COM
HEAT STAGE 1
COOL STAGE 1
INDOOR FAN
163A / 165A
(Applicable to units beginning with serial number 3006E and newer)
NOTE: Wiring must conform to NEC or local codes.
RR
C
C
W/W1
Y/Y2
G
G
RR
C
C
W
W
Y
Y
G
G
R
R
C
C
Fig. 16 --- Non--Communicating Standard Thermostat
2--Wire 24V Circuit Connections
Y
Y
FIELD INSTALLED
JUMPER WIRE
A06304
16
Page 17
PURONR (R--410A) REFRIGERANT QUICK REFERENCE GUIDE
S Puron refrigerant operates at 50--70 percent higher pressures than R--22. Be sure that servicing equipment and replacement
components are designed to operate with Puron refrigerant.
S Puron refrigerant cylinders are rose colored.
S Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
S Puron refrigerant systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose
when charging into suction line with compressor operating
S Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low--side retard.
S Use hoses with 700 psig service pressure rating.
S Leak detectors should be designed to detect HFC refrigerant.
S Puron refrigerant, as with other HFCs, is only compatible with POE oils.
S Vacuum pumps will not remove moisture from oil.
S Do not use liquid--line filter driers with rated working pressures less than 600 psig.
S Do not leave Puron refrigerant suction line filter driers in line longer than 72 hours.
S Do not install a suction--line filter drier in liquid line.
S POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
S POE oils may cause damage to certain plastics and roofing materials.
S Wrap all filter driers and service valves with wet cloth when brazing.
S A factory approved liquid--line filter drier is required on every unit.
S Do NOT use an R--22 TXV.
S If indoor unit is equipped with an R--22 TXV or piston metering device, it must be changed to a hard shutoff Puron TXV.
S Never open system to atmosphere while it is under a vacuum.
S When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter driers.
Evacuate to 500 microns prior to recharging.
S Do not vent Puron refrigerant into the atmosphere.
S Do not use capillary tube coils.
S Observe all warnings, cautions,andbold text.
S All indoor coils must be installed with a hard shutoff Puron TXV metering device.
163A / 165A
17
Page 18
163A / 165A
EBryant Heating & Cooling Systems 7310 W. Morris St. Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 06/06
Manufacturer reserves the right to discontinue, or change at any time, speci fications or designs without notice and without incurring obligations.
Catalog No. II 163A--- 1 8 --- 3
Replaces:II 163A--- 18--- 2
18
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