264A / 265A
PREFERRED SERIES HEA T PUMP
WITH PURON REFRIGERANT
SIZES 018 TO 060
1--1/2 TO 5 NOMINAL TONS
Installation Instructions
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 may result in minor
personal injury or product and property damage. NOTE is used to
highlight suggestions which will result in enhanced installation,
reliability, or operation.
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing, 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.
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.
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. 1.)
!
!
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. 1.)
8. Ensure that tubing insulation is pliable and completely
surrounds vapor tube.
9. When necessary, use hanger straps which are 1 in. (25.4
mm) wide and conform to shape of tubing insulation. (See
Fig. 1.)
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)
1″ (25.4 mm)MIN.
SUSPENSION
LIQUID TUBE
VAPOR TUBE
JOIST
INSULATION
VAPOR TUBE
LIQUID TUBE
A94028
Fig. 1 --- Connecting Tubing Installation
When outdoor unit is connected to factory-- approved indoor unit,
outdoor unit contains system refrigerant charge for operation with
ARI rated indoor unit when connected by 15 ft/4.57 m. of
field--supplied or factory accessory tubing. For proper unit
operation, check refrigerant charge using charging information
located on control box cover and/or in the Check Charge section
of this instruction.
INSTALLATION
Check Equipment and Job Site
Unpack
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.
Install on a Solid, Level Mounting Pad
If conditions or local codes require the unit be attached to pad,
tiedown bolts should be used and fastened through knockouts
provided in unit base pan. Refer to unit mounting pattern in
Fig. 2 to determine base pan size and knockout hole location.
For hurricane tie downs, contact distributor for details and PE
Certification (Professional Engineer), if required.
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
264A / 265A
support unit and minimize transmission of vibration to building.
Consult local codes governing rooftop applications.
Roof mounted units exposed to winds above 5 mph may require
wind baffles. Consult the Service Manual -- Residential Split
System Air Conditioners and Heat Pumps for wind baffle
construction.
NOTE: Unit must be level to within ±2° (±3/8 in./ft.) per
compressor manufacturer specifications.
Clearance Requirements
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 30 in. (762 mm)
clearance to service end of unit and 48 in. (1219.2 mm) above
unit. For proper airflow, a 6 in. (152.4 mm) clearance on 1 side of
unit and 12 in. (304.8 mm) on all remaining sides must be
maintained. Maintain a distance of 24 in. (609.6 mm) between
units. Position so water, snow, or ice from roof or eaves cannot
fall directly on unit.
Unit
3/8-- IN. DIA. TIEDOWN KNOCKOUTS
IN BASEPAN (2) PLACES
Operating Ambient
The minimum outdoor operating ambient in cooling mode is
55°F/12.78_C without low ambient cooling enabled, and the
maximum outdoor operating ambient in cooling mode is
125°F/51.67_C. The maximum outdoor operating ambient in
heating mode is 66 °F/18.89_C.
Elevate Unit
!
UNIT OPERATION HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Unit must be kept free of an accumulation of water and/or ice
in the basepan.
Elevate unit per local climate and code requirements to provide
clearance above estimated snowfall level and ensure adequate
drainage of unit. If using accessory support feet, use installation
instructions from kit for installation.
!
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
To prevent damage to the unit, ensure that it is located with
the supports such that the unit is stable in all circumstances
including adverse conditions.
CAUTION
CAUTION
Make Piping Connections
!
PERSONAL INJURY / 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.
WARNING
VIEW
FROM TOP
UNIT BASE PAN
DIMENSIONS
in. (mm)
29--1/2 X 33
(749.3 X 838.2)
36–1/2 X 40
(927.1 X 1016)
Fig. 2 --- Tiedown Knockout Requirements
On rooftop applications, locate unit at least 6 in. above roof
surface.
TIEDOWN KNOCKOUT LOCATIONS in. (mm)
A B C
10–1/16
(255.6)
9–5/8
(244.5)
5–5/8
(142.9)
6–13/16
(173.0)
23–3/4
(603.3)
28–3/4
(730.3)
A05177
!
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. (152.4
mm) vertical rise at service valve. Refrigerant tubing lengths
up to 36 in.(914.4 mm) may be buried without further
special consideration. Do not bury lines longer than 36 in.
(914.4 mm).
!
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.
2
CAUTION
CAUTION
Outdoor units may be connected to indoor section using
accessory tubing package or field-- supplied refrigerant grade
tubing of correct size and condition. For tubing requirements
beyond 80 ft/24.38 m, substantial capacity and performance
losses can occur. Following the recommendations in the Long
Line Guideline for Split--System Air Conditioners and Heat
Pumps will reduce these losses. Refer to Table 1 for accessory
requirements. Refer to Table 2 for field tubing diameters.
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—Accessory Usage
REQUIRED FOR LOW--- AMBIENT
ACCESSORY
Accumulator Standard Standard Standard
Compressor Start Assist
Capacitor and Relay
Crankcase Heater Ye s
Evaporator Freeze Thermostat
Isolation Relay
Liquid Line Solenoid Valve No
Motor Master Control or
Low Ambient Switch
Support Feet Recommended No Recommended
* For tubing line sets between 80 and 200 ft. (24.38 and 60.96 m) and/or 20 ft. (6.09 m) vertical differential, refer to Residential Split --- System Longline Application Gui deline.
COOLING APPLICATIONS
(Below 55F / 12.8C)
Ye s Ye s No
Ye s
(for non ---Evolution systems only)
Ye s
(for non ---Evolution systems only)
Ye s
(for non ---Evolution systems only)
REQUIRED FOR
LONG LINE APPLICATIONS*
(Over 80 ft. / 24.38 m)
Ye s
No No
No No
See Long ---Line Application
Guideline
No No
REQUIRED FOR
SEA COAST APPLICATIONS
(Within 2 miles / 3.22 km)
No
No
Table 2—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (In.)
UNIT SIZE
LIQUID
Connection Diameter Tube Diameter Connection Diameter Rated Tube Diameter
018, 024 3/8 3/8 5/8 5/8
030, 036 3/8 3/8 3/4 3/4
042, 048 3/8 3/8 7/8 7/8
060 3/8 3/8 7/8 1--1/8
Notes:
1. Tube diameters are for total equivalent lengths up to 80 ft. (24.38 m)
2. Do not apply capillary tube or fixed orifice indoor coils to these units.
* For Tubing Set lengths between 80 and 200 ft. (24.38 and 60.96 m) horizontal or 20 ft. (6.10 m) vertical differential (250 ft./ 76.2 m)Total Equivalent Lengt h),
refer to the Longline Guideline --- Air Conditioners and Heat P umps using Puronr Refrigerant.
VA P O R
(up to 80 ft/24.38 m)
264A / 265A
the environmentally sound refrigerant
ISO 9001:2000
REGISTERED
Ready for use in a Hybrid Heatr Duel Fuel system.
3
This produ ct has been desi gned and manuf actured to
meet Energy Star criteria for energy efficiency when
matched with appropriate coil components. However,
proper refr igerant ch arge and proper ai r flow are cr itical
to achieve rated capacity and effi ciency. Installation of
this product should follow all manufacturing refri gerant
charging and air flow instructions. Failure to confirm
proper charge and air flow may reduce energy
efficiency and shorten equipment life.
Outdoor Unit Connected to Factory Approved
T
Indoor Unit
These outdoor units are carefully evaluated and listed with
specific indoor coils for proper system performance.
Install Adapter Tube
1. Remove plastic retainer holding outdoor piston in liquid
service valve.
2. Check outdoor piston size with matching number listed on
unit rating plate.
3. Locate plastic bag taped to unit containing adapter tube.
4. Remove Teflon seal from bag and install on open end of
liquid service valve. (See Fig. 3.)
5. Remove adapter tube from bag and connect threaded nut
to liquid service valve. Tighten nut finger--tight and then
with wrench an additional 1/2 turn (15 ft--lb). DO NOT
OVER TIGHTEN!
TEFLONr SEAL
PISTON
A05227
Fig. 4 --- Liquid Line Filter Drier
Leak Testing
Leak test all joints; indoors, outdoors, and refrigerant tubing.
Evacuate Refrigerant Tubing and Indoor Coil
264A / 265A
PISTON
BODY
Fig. 3 --- Liquid Service Valve with Sweat Adapter Tube
SWEAT / FLARE
ADAPTER
Refrigerant Tubing and Sweat Connections
Connect vapor tube to fitting on outdoor unit vapor service
valves (see Table 2). Connect liquid tubing to adapter tube on
liquid service valve. Use refrigerant grade tubing.
!
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 while brazing.
!
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
CAUTION
Install Liquid Line Filter Drier Ind oor
Refer to Fig. 4 and install filter drier as follows:
1. Braze 5 in. (127 mm) liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to 5 in. (127 mm) long liquid tube from
step 1.
4. Connect and braze liquid refrigerant tube to the filter drier.
A05226
!
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 evacuation method may also be used. See Service Manual
for Triple Evacuation Method.
IMPORTANT: Always break a vacuum with dry nitrogen.
CAUTION
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. 5. )
5000
4500
4000
3500
3000
2500
MICRONS
2000
1500
1000
500
01234567
MINUTES
Fig. 5 --- Deep Vacuum Graph
LEAK IN
SYSTEM
VACUUM TIGH
TOO WET
TIGHT
DRY SYSTEM
A95424
4
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.
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 system where voltage may fluctuate above or below
permissible limits.
NOTE: Use copper wire only between disconnectswitch 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.
WARNING
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.
!
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.
WARNING
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. 6.
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
FIELD POWER
WIRING
CONTACTOR
Connect Control Wiring
Route 24v control wires through control wiring grommet and
connect leads to control wiring. See Thermostat Installation
Instructions for wiring specific unit combinations.
Use No. 18 AWG color--coded, insulated (35°C minimum) wire.
If thermostat is located more than 100 ft/30.48 m 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 NEC Class 1 and must be separated from
incoming power leads.
Use furnace transformer, fan coil transformer, or accessory
transformer for control power, 24v/40va minimum.
NOTE: Use of available 24v accessories may exceed the minimum
40va power requirement. Determinetotal transformer loading 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.
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 thermostat to OFF and close electrical disconnect to
outdoor unit.
A crankcase heater is required if refrigerant tubing is longer than
80 ft/24.38 m. Refer to the Long Line Guideline--Residential
Split--System Air Conditioners and Heat Pumps.
Install Electrical Accessories
Refer to the individual installation instructions packaged with kits
or accessories when installing.
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 OA T is locked in place. See Fig. 7.
OAT Thermistor must be locked in
place with spherical nib end facing
towards the front of the control box
264A / 265A
FIELD GROUND
WIRING
Fig. 6 --- Line Connections
GROUND LUG
A05408
Fig. 7 --- Outdoor Air Thermistor (OAT) Attachment
A91056
5
The Outdoor Coil Temperature (OCT) Thermistor is factory
installed on the 3/8” diameter stub tube located on the coil
assembly. Check to make sure that it is securely attached with the
clip as shown in Fig. 8.
OCT Thermistor
must be secured
tight on stub tube.
A05409
Fig. 8 --- Outdoor Coil Thermistor (OCT) Attachment
START--UP
Follow these steps to properly start up system:
1. After system is evacuated, fully open liquid and vapor service valves.
2. Unit is shipped with valve stem(s) closed and caps installed. Replace stem caps after system is opened to refrigerant flow (back seated). Replace caps finger--tight and
tighten with wrench an additional 1/12 turn.
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 HEAT or COOL and fan control to
ON or AUTO mode, as desired. Operate unit for 15
minutes. Check system refrigerant charge.
264A / 265A
!
CAUTION
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.
!
CAUTION
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 Back seating service valves are not equipped with Schrader
valves. Fully back seat (counter clockwise) valve stem
before removing gage port cap.
!
CAUTION
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.
Fig. 9 --- Evolution Control Four--Wire
Connection Diagram
NOTE: Wiring must conform to NEC or local codes.
NOTE: For standard thermidistat or thermostat wiring, see
Installation Instructions for those products.
HP THERMOSTAT
24 VAC HOT
24 VAC COM
HEAT STAGE 2
COOL/HEAT
STAGE 1
INDOOR FAN
RVS COOLING
EMERGENCY
HEAT
TYPICAL
FAN COIL
R
C
W2
Y
G
O
E
IF AVAILABLE
*
LEGEND
24-V FACTORY WIRING
24-V FIELD WIRING
FIELD SPLICE CONNECTION
ODT
OUTDOOR THERMOSTAT
EHR
EMERGENCY HEAT RELAY
SHR
SUPPLEMENTAL HEAT RELAY
R
C
W2
W3
G
*
*
E
*
HEAT
PUMP
R
C
W2
Y
O
A06078
A02325 / A97413
Fig. 10 --- Generic Wiring Diagram for Standard
Thermostat Installations
6
Check Charge
Factory charge amount and desired subcooling are shown on unit
rating plate. Charging method is shown on information plate
inside unit. To properly check or adjust charge, conditions must
be favorable for subcooling charging. Favorable conditions exist
when the outdoor temperature is between 70_F and 100_F
(21.11_C and 37.78_C), and the indoor temperature is between
70_F and 80_F (21.11_C and 26.67_C). Follow the procedure
below:
Unit is factory charged for 15ft (4.57 m) of lineset. Adjust charge
by adding or removing 0.6 oz/ft of 3/8 liquid line above or below
15ft (4.57 m) respectively.
For standard refrigerant line lengths (80 ft/24.38 m or less), allow
system to operate in cooling mode at least 15 minutes. If
conditions are favorable, check system charge by subcooling
method. If any adjustment is necessary, adjust charge slowly and
allow system to operate for 15 minutes to stabilize before
declaring a properly charged system.
If the indoor temperature is above 80_F (26.67_C), and the
outdoor temperature is in the favorable range, adjust system
charge by weight based on line length and allow the indoor
temperaturetodropto80_F (26.67_C) before attempting to
check system charge by subcooling method as described above.
If the indoor temperature is below 70_F (21.11_C), or the
outdoor temperature is not in the favorable range, adjust charge
for line set length above or below 15ft (4.57 m) only. Charge
level should then be appropriate for the system to achieve rated
capacity. The charge level could then be checked at another time
when the both indoor and outdoor temperatures are in a more
favorable range.
NOTE: If line length is beyond 80 ft (24.38 m) or greater than
20 ft (6.10 m) vertical separation, See Long Line Guideline for
special charging requirements.
Heating Check Chart Procedure
To check system operation during heating cycle, refer to the
Heating Check Chart on outdoor unit. This chart indicates
whether a correct relationship exists between system operating
pressure and air temperature entering indoor and outdoor units. If
pressure and temperature do not match on chart, system
refrigerant charge may not be correct. Do not use chart to adjust
refrigerant charge.
GENERAL SEQUENCE OF OPERATION
STANDARD THERMOSTAT
Turn on power to indoor and outdoor units. Transformer is
energized with power supplied.
Cooling
On a call for cooling, a standard thermostat
(non--communicating) makes circuits R--O and R-- Y and R--G.
Circuit R--O energizes reversing valve, switching it to cooling
position. 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.
When a standard thermostat (non--communicating) is satisfied, its
contacts open, de--energizing contactor and blower relay.
Compressor and motors should stop.
NOTE: If indoor unit is equipped with a time--delay relay circuit,
the indoor blower will run an additional 90 seconds to increase
system efficiency.
Heating
On a call for heating a standard thermostat (non--communicating)
makes circuits R-- Y and R--G. Circuit R --Y energizes contactor,
starting outdoor fan motor and compressor. Circuit R--G
energizes indoor blower relay, starting blower motor on high
speed.
Should temperature continue to fall, R --W2 is made through
second-- stage room thermostat. Circuit R--W2 energizes a relay,
bringing on first bank of supplemental electric heat and providing
electrical potential to second heater relay (if used). If outdoor
temperature falls below setting of outdoor thermostat (factory
installed), contacts close to complete circuit and bring on second
bank of supplemental electric heat.
When thermostat is satisfied, its contacts open, de--energizing
contactor and relay. All heaters and motors should stop after all
fan off delays.
HEAT PUMP SYSTEM FUNCTIONS
AND SEQUENCE OF OPERATION
The outdoor unit control system has special functions. The
following is an overview of the control functions.
SEQUENCE OF OPERATION
Cooling & Heating
This product utilizes either a standard indoor thermostat or
Evolution communication User Interface. With a call for cooling,
the outdoor fan, reversing valve, and compressor are energized.
When the cooling demand is satisfied, the compressor and fan
will shut off. The reversing valve will remain energized until the
control board power is removed or a call for heating is initiated.
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_F/37.78_C.
With a call for heating, the outdoor fan and compressor are
energized. The reversing valve is de--energized in the heating
mode.
Communication and Status Function Lights
Green Communications (COMM) Light
(Evolution Control only)
A green LED (COMM light) on the outdoor board (see Fig. 11)
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 Operation
The crankcase heater (when applicable) is energized during the
off cycle below 65_F/18.33_C.
Outdoor Fan Motor Operation
The outdoor unit control energizes outdoor fan any time the
compressor is operating (except defrost and intermittently during
low ambient cooling). 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_F/37.78_C.
Operation
264A / 265A
7
Time Delays
264A / 265A
The unit time delays include:
S Five minute time delay to start cooling or heating oper-
ation when there is a call from the thermostat or user
interface (To bypass this feature in a non --communicating system, momentarily short and release forced defrost pins, in a communicating system push the UI fan
and up buttons simultaneously for approximately 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 communication (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_F/37.78_C.
S Fifteen second delay at termination of defrost before
the auxiliary heat (W2) is de--energized
S Twenty second delay at termination of defrost before
the outdoor fan is energized
S Thirty second compressor delay when Quiet Shift en-
abled
Utility Interface
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 Fig. 12 for wiring connections. When the utility
sends a signal to shut the system down, the User Interface will
display ”CURTAILMENT ACTIVE”.
EVOLUTION BOARD
R
UTILITY RELAY
UTIL
*
COMM STATUS
Fig. 11 --- Control Board
Outdoor Coil Temp (OCT)
}
} Outdoor Air Temp (OAT)
A05332
With Non--Communicating Thermostats
When the utility curtailment interface is used with a
non-- communicating thermostat, the utility relay should be wired
between R and Y.
Low Ambient Cooling
When this unit is operating below 55_F/12.78_C outdoor
temperature, provisions must be made for low ambient operation.
Evolution Controlled low ambient cooling:
This unit is capable of low ambient cooling without a kit ONLY
when using the Evolution control. 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 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/4.44_C OAT. Fan will cycle based on coil and outdoor air
temperature.
Evolution controlled low ambient mode operates as follows:
S Fan is OFF when outdoor coil temp is < (outdoor air
temperature + 3_F/--16.11_C) 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 airtemper-
ature + 25_F/--3.89_C) or outdoor coil temp >
80_F/26.67_C or if outdoor fan has been OFF for 30
minutes. (Fan is turned on to allow refrigerant system
to stabilize.)
S Low pressureswitchis 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 routinelisted above for theremainder
of the cooling cycle. If the LPS does not close within
10 minutes, then the normal LPS trip response (shut
down cooling operation and generateLPS trip error)will
occur.
UTILITY SIGNAL
OPEN RELAY
*
SUPPLIED BY UTILITY PROVIDER
A05409
Fig. 12 --- Utility Interface
8
Standard Thermostat low ambient cooling mode:
A Low Ambient Pressure Switch kit, Evaporator Freeze
Thermostat and Isolation Relay must be installed for low ambient
operation in standard thermostat mode. The fan motor is a
ball--bearing type and does not need to be changed. A crankcase
heater must be installed. See Product Data for part numbers on
appropriate unit size and series units.
DEFROST
This control offers 4 possible defrost interval times: 30, 60, 90 or
120 minutes. These are selected by dip switches on the unit
control board, or in the Evolution control (if used). The
Evolution Control selection overrides the control board dip
switch settings.
Auto defrost is available with Evolution communicating control
only and it must be enabled in the User Interface. Auto defrost
adjusts the defrost interval time based on the last defrost time as
follows:
S When defrost time is < 3 minutes, the next defrost
interval = 120 minutes
S When defrost time is 3--5 minutes, the next defrost
interval = 90 minutes
S When defrost time is 5--7 minutes, the next defrost
interval = 60 minutes
S When defrost time is > 7 minutes, the next defrost
interval = 30 minutes
The control board accumulates compressor run time. As the
accumulated run time approaches the selected defrost interval
time, the control board monitors the coil temperature sensor for a
defrost demand. If a defrost demand exists, a defrost cycle will be
initiated at the end of the selected time interval. A defrost demand
exists when the coil temperature is at or below 32_F/0_Cfor4
minutes during the interval.
The defrost cycle is terminated when the coil temperature reaches
65_F/18.33_C or 10 minutes has passed.
If the coil temperature does not reach 32_F/0_C within the
interval, the interval timer will be reset and start over.
NOTE:
S Upon initial power up the first defrost interval is defaulted
to 30 minutes. Remaining intervals are at selected times.
S Defrost is only allowed to occur below 50_F/10_C out-
door ambient temperature.
Defrost Hold
In a non--communicating system, if the thermostat becomes
satisfied before the defrost cycle is terminated, the control will
”hold” in defrost mode and finish the defrost cycle on the next
call for heat. Defrost hold is not needed in a communicating
system because the User Interface will complete the defrost cycle
before shutting down the system.
Forced Defrost
Forced defrost can be initiated manually in a non--communicating
system, or by communicated command from a User Interface.
The board contains a 2--pin header labeled FORCED DEFROST
(See Figure 14). To initiate a forced defrost:
S Manually, short FORCED DEFROST pins for 5
seconds then release
S If coil temp is at defrost temp of 32_F/0_C, and out-
door air temperature is below 50_F/10_C, a full defrost
sequence will occur
S If the coil temp or outdoor air temperature do not meet
the above requirements, an abbreviated 30 second defrost will occur
QUIET SHIFT
This feature must be enabled by selecting the 3rd position of the
3--position dip switch for a non--communicating system or
enabling it at the User Interface in an Evolution communicating
system. Quiet Shift is a field selectable defrost mode that, when
activated, will eliminate occasional compressor sound that could
be heard at the start of defrost cycle and restart of heating cycle.
When the Quiet Shift is activated, and a defrost is initiated, the
following sequence of operation will occur. Reversing valve will
energize, compressor will turn off for 30 seconds, and then turn
back on to complete defrost. At the start of heating after
conclusion of defrost, reversing valve will de-- energize,
compressor will turn off for another 30 seconds, and the fan will
turn off for 40 seconds, before starting in the heating mode.
LIQUID LINE SOLENOID ACCESSORY
In heat pump long line applications, a liquid line solenoid is
required to control refrigerant migration in the heating mode. The
solenoid should be installed near the outdoor unit with the arrow
facing the outdoor unit. This is the direction of flow control. See
Long Line Application Guideline for details.
Accessory Liquid Solenoid with Evolution Communicating
Control: When using the Evolution Control, a liquid line solenoid
output labeled LS is provided. Connect the solenoid as shown in
the wiring label diagram. This is a 24vac output that is energized
whenever the compressor is energized. It closes in the
compressor--off mode to prevent refrigerant migration into the
unit through the liquid line.
Accessory Liquid Solenoid with Non--Communicating
Thermostat: The liquid solenoid is connected to the Y and C
terminal connections. The liquid solenoid closes in the
compressor--off mode to prevent refrigerant migration into the
unit through the liquid line.
MAJOR COMPONENTS
Control
The Heat Pump control board controls the following functions:
Board
S Compressor contactor operation
S Outdoor fan motor operation
S Reversing valve operation
S Defrost operation
S Compressor external protection
S Pressure switch monitoring
S Time delays
Field Connections
The control receives 24vac low--voltage control system inputs
through the R, C, Y and O thermostat connections located at the
bottom of the control board (see Fig. 11) or the ABCD Evolution
connector at the bottom of the control board. The 24vac control
output terminal connection W2 is used during defrost. On
Evolution only, the 24vac LS (liquid solenoid) output terminal is
energized for the liquid solenoid accessory. The connection is
located at the bottom of the control board.
Compressor Internal Relief
The compressor is protected by an internal pressure relief (IPR)
which relieves discharge gas into the compressor shell when
differential between suction and discharge pressure exceeds
550--625 psi. The compressor is also protected by an internal
overload attached to motor windings.
264A / 265A
9
TROUBLESHOOTING
Systems Communication Failure
If communication between User Interface (UI), and condensing
unit is lost, the outdoor control will flash the appropriate fault
code. (See Table 3) Check the wiring to the UI, indoor and
outdoor units.
Pressure Switch Protection
The outdoor unit is equipped with high-- and low--pressure
switches. If the control senses the opening of a high or
low--pressure switch, it will de--energize the compressor
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.
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.
264A / 265A
In the event of a high--pressure switch trip or high--pressure
lockout, check the refrigerant charge, outdoor fan operation and
outdoor coil (in cooling) for airflow restrictions, or indoor airflow
in heating.
In the event of a low--pressure switch trip or low--pressure
lockout, check the refrigerant charge and indoor airflow (cooling)
and outdoor fan operation and outdoor coil in heating.
Control Fault
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 Protection
If the control voltage is less than 15.5volts for at least 4 seconds,
the compressor contactor 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 Sensing
The input terminals labeled VR and VS on the control board (see
Fig. 11) 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 230V
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, keep 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 Detection
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 Compressor
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 Thermistors
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).
Refer to Fig. 13 for resistance values versus temperature.
If the outdoor air or coil thermistor should fail, the control will
flash the appropriate fault code. (See Table 3)
IMPORTANT: The outdoor air thermistor and coil thermistor are
factory mounted in the correct locations. Do not re--locate
thermistor sensors.
Thermistor Sensor Comparison
The control continuously monitors and compares the outdoor air
temperature sensor and outdoor coil temperature sensor to ensure
proper operating conditions. The comparison is
S In cooling if the outdoor air sensor indicates
10_F/--12.22_C warmer than the coil sensor(or) the outdoor air sensor indicates 20_F/--6.67_C cooler than the
coil sensor, the sensors are out of range.
S In heating if the outdoor air sensor indicates
35_F/1.67_C warmer than the coil sensor (or) the out-
door air sensor indicates 10_F/-- 12.22_C 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 or defrost operation.
Failed Thermistor Default Operation
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.
Defrost will be initiated based on coil temperature and time.
If the OCT sensor should fail, low ambient cooling will not be
allowed. Defrost will occur at each time interval during heating
operation, but will terminate after 5 minutes.
If there is a thermistor out of range error, defrost will occur at
each time interval during heating operation, but will terminate
after 5 minutes.
Thermistor Curve: The resistance vs. temperature chart shown
in Fig. 13 enables the technician to check the outdoor air and
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
60_F/15.56_C, the resistance reading across the outdoor air
thermistor should be around 16,000 Ohms.
10
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
OPERATION FAULT
Standby – no call for
unit operation
Cool/Heat Operation None 1, pause Normal operation
None
System Communica-
tions Failure
High Pressure Switch
Open
Low Pressure Switch
Open
Control Fault 45
Brown O ut
(24 v)
Outdoor Air Temp
Sensor Fault
Outdoor Coil Sensor
Fault
Thermistors out of
range
Thermal Cutout 72
AMBER LED
FLASH CODE
On solid, no
flash
16
31
32
46
53
55
56
Normal operation
Communication with user interface lost. Check wiring to UI, indoor
and outdoor units
High pressure switch trip. Check refrigerant charge, outdoor fan
operation 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
replaced.
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.
Outdoor air sensor not reading or out of range. Ohm out sensor
and check wiring
Coil sensor not reading or out of range. Ohm out sensor and check
wiring
Improper relationship between coil sensor and outdoor air sensor .
Ohm 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.
POSSIBLE CAUSE AND ACTION
264A / 265A
Contactor Shorted 73
No 230V at Compres-
sor
Thermal Lockout 82
Low Pressure Lock-
out
High Pressure Lock-
out
74
83
84
Compressor voltage sensed when no demand for compressor operation 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.
Thermal cutout occurs in three consecutive cycles. Unit operation
locked 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.
11
264A / 265A
THERMISTOR CURVE
90
80
70
60
50
40
30
20
RESISTANCE (KOHMS)
10
0
0
(-17.77)
20
(-6.67)
Fig. 13 --- Resistance vs. Temperature Chart
40
(4.44)
TEMPERATURE °F (°C)
60
(15.56)
(26.67)
PURONR (R-- 410A) QUICK REFERENCE GUIDE
80
100
(37.78)
120
(48.89)
A08054
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 Users Manual with owner. Explain system operation and periodic maintenance requirements outlined in
manual.
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 Users Manual for
information.
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
S Puron refrigerant cylinders are rose colored.
S Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
S Puron 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, 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 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 into the atmosphere.
S Do not use capillary tube coils.
S Ob serve all warnings, cautions,andbold text.
S All indoor coils must be installed with a hard shutoff Puron TXV metering device.
E2008 Bryant Heating & Cooling Systems D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 02/08
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notic e and without incurring obligations.
12
Catalog No. II264A--- 1 8 --- 3
Replaces: II263A--- 18--- 2
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