Bryant 180A User Manual

180A, 187A
Evolutionr Line Air Conditioners
with Puron Refrigerant
2 to 5 Nominal Tons (Sizes 024 to 060)

Installation Instructions

NOTE: Read the entire instruction manual before starting the

installation.

Unless otherwise noted, information in these installation
instructions pertain to both 180A and 187A series units.
Information that is unique to the 180A series will be identified as
such; likewise information that is unique to the 187A series will
also be identified.

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
current editions of the National Electrical Code (NEC) NFPA 70.
In Canada, refer to current editions of the Canadian electrical code
CSA 22.1.

!

Recognize safety information. This is the safety--alert symbol
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.

Understand these signal words; DANGER, WARNING, and
CAUTION. These words are used with the safety--alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability, or
operation.

!

Indoor Thermostat Control Options

Model

187A Ye s Ye s

180A Ye s Ye s *

* Units containing circuit board HK38EA015 or newer.

!

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.

.

UNIT OPERATION AND SAFETY HAZARD

Failure to follow this warning could result in personal injury,
death and/or equipment damage.

Puron refrigerant systems operate at higher pressures than
standard R--22 systems. Do not use R--22 service equipment
or components on Puron equipment.

!

WARNING

WARNING

Evolution

Control

Standard 2 - --stage

Thermostat

!

CAUTION

CUT HAZARD

Failure to follow this caution may result in personal injury.

Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing and gloves when handling
parts.

INSTALLATION RECOMMENDATI ONS

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.

180A / 187A

9. When necessary, use hanger straps which are 1 in. 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.

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.

IMPORTANT: Maximum liquid--line size is 3/8--in. OD for all
residential applications including long line applications.

IMPORTANT: Always install the factory--supplied liquid--line
filter drier. If replacing the filter drier, refer to Product Data Digest
for appropriate part number. Obtain replacement filter driers from
your distributor or branch.

can be no deviation. Consult the Application Guideline and
Service Manual – Air Conditioners and Heat Pumps Using Puron
Refrigerant to obtain required unit changes for specific applications
andforR--22retrofit.

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.

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. 2
to determine base pan size and knockout hole location.

For hurricane tie downs, contact distributor for details and PE
Certified (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
Consult local codes governing rooftop applications.

Roof mounted units exposed to winds above 5 mph may require
wind baffles. Consult the Application Guideline and Service
Manual -- Residential Split System Air Conditioners and Heat
Pumps Using Puron Refrigerant for wind baffle construction.

INSTALLATION

Avoid contact between tubing and structureNOTE:

OUTDOOR WALL

CAULK

INSULATION

THROUGH THE WALL

HANGER STRAP

(AROUND VAPOR

TUBE ONLY)

1” (25.4 mm) MIN.

Fig. 1 -- Connecting Tube 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

INDOOR WALL

SUSPENSION

LIQUID TUBE

VAPOR TUBE

JOIST

INSULATION

VAPOR TUBE

LIQUID TUBE

A94026

UNIT BASE PAN

DIMENSIONS

in. (mm)

36---1/2 x 40

(927.1x1016)

TIEDOWN KNOCKOUT LOCATIONS

A B C

11---5/8

(295.3)

in. (mm)

6---13/16

(173.0)

28---3/4

(730.3)

A05177

Fig. 2 -- Clearance Requirements

NOTE: Unit must be level to within ±2_, ±3/8 in./ft. (9.53

mm/m) per compressor manufacturer specifications.

Clearance Requirements

When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 24 in. (610 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.

2

On rooftop applications, locate unit at least 6 in. (152.4 mm) above
roof surface.

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. On Evolution communicating systems only, for
both 180A and 187A models, low ambient cooling is available to
0_F/--17.78_C.

Make Piping Connections

!

CAUTION

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).

!

WARNING

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.

!

CAUTION

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.

Table 1 – Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (in.)

UNIT SIZE

187A024 3/8 3/8 5/8 5/8
187A036 3/8 3/8 3/4 3/4
187A048 3/8 3/8 7/8 7/8
187A060 3/8 3/8 7/8 1 --- 1 / 8

Connection

Diameter

Outdoor units may be connected to indoor section using
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 Residential Piping and Longline
Guideline 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. (914.4
mm).

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 Factory Approved Indoor
Unit:

Outdoor unit contains correct system refrigerant charge for
operation with factory approved ARI rated indoor unit with highest
sales volume when connected by 15 ft (4.57 m) of field-- supplied
or factory-- accessory tubing, and factory supplied filter drier.
Check refrigerant charge for maximum efficiency.

LIQUID RATED VAPOR*

Tube

Diameter

Connection

Diameter

Tube

Diameter

180A / 187A

180A024
180A036
180A048

180A060 3/8 3/8 7/8 1 --- 1 / 8

* Units are rated with 25 f t. (7.6 m) of lineset. See Product Data sheet for performance data when using different size and length linesets.

Notes:

1. Do not apply capillary tube or fixed orifice indoor coils to these units.

2. 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 Length),
refer to the Residential Piping and Longline Guideline.

the environmentally sound refrigerant

3/8 3/8 7/8 7/8

ISO 9001:2000

REGISTERED

This produc t has been designed and manuf actured to
meet Energy St ar® criteria for energy effici ency when
matched with appropriate coil components. However,
proper refri gerant char ge and proper air flow ar e critic al
to achieve rated capacity and efficiency. Installation of
this product should follow all manufacturing refrigerant
charging and air flow instructions. Failure to confirm

proper charge and air flow may reduce energy
efficiency and shorten equipment life.

3

Table 2 – Accessory Usage

REQUIRED FOR

Accessory

Compressor Start Assist Capacitor and

Puron Balance Port Hard Shut --- off TXV

* For Tubing Set lengths between 80 and 200 f t. (24.38 and 60.96 m) horizontal or 20 ft. (6.10 m) vertical differential (250 ft./76.2 m Total Equivalent Length),

refer to the Residential Piping and Long Line Guideline for Air Conditioners and Heat Pumps using Puron® Refrigerant.

{ Required on all indoor units. Standard on all new Puron fan coils and furnace coils.
} Information is specific to 187A and 180A models.

Accumulator No No No

Relay}

Crankcase Heater Standard

Evaporator Freeze Protection

Liquid Line Solenoid Valve No

Low--- ambient Control

Winter Start Control

Support Feet Recommended No Recommended

L O W --- A M B I E N T C O O L I N G

APPLICATIONS

(Below 55°F/12.8_C)

Standard on 187A models.

Not required for 180A models.

Standard with Evolution Control

(Low Ambient not allowed with non ---

communicating Thermostat)

Standard with Evolution Control (Low

Ambient not allowed with non ---com-

municating thermostat)

Ye s {

Standard with Evolution Control (Low
Ambient not allowed with Non---Com-

municating Thermostat)

REQUIRED FOR LONG LINE

APPLICATIONS*

Standard on 187A models.

Not required for 180A models.

Standard

No No

No

No No

Ye s { Yes {

No No

REQUIRED FOR SEA COAST

APPLICATIONS

(Within 2 mile s/3.22 km)

Standard on 187A models.

Not required for 180A models.

Standard

180A / 187A

Install Liquid--Line Filter Drier Indoor

!

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.

Refer to Fig. 3 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 above 5 in. (127 mm) liquid tube. Flow
arrow must point towards indoor coil.

4. Connect and braze liquid refrigerant tube to the filter drier.

CAUTION

Refrigerant Tubing Connection Outdoor

Connect vapor tube to fitting on outdoor unit vapor service valves
(see Table 1.) Connect and braze the 3/8 in. coupling (provided
with the filter drier) to the liquid service valve and connect and
braze the liquid tubing to the other end of this coupling. Use
refrigerant grade tubing.

Sweat Connection

!

UNIT DAMAGE HAZARD

Failure to follow this caution may result in equipment
damage or improper operation.

S Use a brazing shield
S Wrap service valves with wet cloth or heat sink material.

CAUTION

No

Fig. 3 -- Liquid Line Filter Drier

A05178

Use refrigerant grade tubing. Service valves are closed from factory
and ready for brazing. After wrapping service valve with a wet
cloth, braze sweat connections using industry accepted methods
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 Indoor 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.

CAUTION

4

Refrigerant tubes and indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. The alternate
triple evacuation method may be used. See Service Manual for
triple evacuation method. Always break a vacuum with dry
nitrogen._

Deep Vacuum Method

The deep vacuum method requires a vacuum pump capable of
pulling a vacuum of 500 microns and a vacuum gage capable of
accurately measuring this vacuum depth. The deep vacuum method
is the most positive way of assuring a system is free of air and
liquid water. (See Fig. 4)

5000
4500
4000
3500
3000
2500
2000

MICRONS

1500
1000

500

01234567

MINUTES

Fig. 4 -- Deep Vacuum Graph

LEAK IN
SYSTEM

VACUUM TIGHT
TOO WET

TIGHT
DRY SYSTEM

A95424

A95424

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 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 Wires

Remove access panel to gain access to unit wiring. Extend wires
from disconnect through power wiring hole provided and into unit
control box.

WARNING

!

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. 5.

DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES

FIELD POWER

WIRING

FIELD GROUND

WIRING

Fig. 5 -- Line Power Connections

GROUND LUG

CONTACTOR

A91056

Connect Control Wiring

Route low--voltage control wires through control wiring grommet
and connect leads to control board.

For Evolution, connect to ABCD only. For standard
non--communicating thermostats, connect to standard thermostat
connections R, C, Y1 and Y2.

Use No. 18 AWG color--coded, insulated (35_C minimum) wire
for all installations.

All wiring must be NEC Class 1 and must be separated from
incoming power leads.

Use furnace transformer or fan coil transformer for control power,
24--v/40--va minimum. The outdoor unit requires a minimum of
27va/24 vac control power.

Final Wiring Checks

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

Furnish power to crankcase 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.

NOTE: On 187A models, starting the compressor without a
minimum of 12 hours of crankcase heat prior to initial start--up
may result in a compressor chattering noise and possible damage to
the compressor.

Install Accessories

Refer to the individual instructions packaged with kits or
accessories when installing.

180A / 187A

5

Make Airflow Selections

Airflow Setup for Evolution Control Furnace of FE
Fan coil

When using an Evolution User Interface, airflow is
automatically selected based on equipment size. See User
Interface Installation Instructions for available
adjustments.

Airflow Selection for Variable Speed Furnaces
Models Using Non--Communicating
Thermostats

The variable speed furnaces provide blower operation to match the
capacities of the compressor during high and low stage cooling
operation, The furnace control board allows the installing
technician to select the proper airflows for each stage of cooling.
Below is a summary of required adjustments. See furnace
installation instructions for more details:

180A / 187A

If a h igher or lower Continuous Fan speed is desired, the
Continuous Fan speed can be changed using the fan switch on the
thermostat. Refer to the furnace installation instructions for details
of how to use this feature.

Airflow Selection for FV4 Fan Coils for Models Using
Non-- Communicating (non--Evolution)

The FV4B provides high-- and low--stage blower operation to
match the capacities of 187A compressor at high-- and low--stage.
The FV4C provides high-- and low--stage blower operation to
match the capacities of 180A compressor at high-- and low-- stage
(units containing circuit board HK38EA015 or newer). To select
recommended airflow, refer to the FV4 Installation Instructions.
The FV4 utilizes an Easy Select control board that allows the
installing technician to select proper airflows. For adjustments to
control board and recommended A/C SIZE and CFM ADJUST
selections. This fan coil has an adjustable blower off delay factory
set at 90 sec. for high-- and low--stage blower operation.

For other combinations of equipment consult the Product Data
Sheet.

(communicating)

(non--Evolution)

1. Turn SW1--5 ON for 400 CFM/ton airflow or OFF for 350
CFM/ton airflow. Factory default is OFF.

2. The A/C DIP switch setting determines airflow during high
stage cooling operation. Select the A/C DIP switch setting
corresponding to the available airflow shown in the furnace
installation instructions that most closely matches the re­quired airflow shown in the air conditioning Product Data
for HIGH speed.

3. The CF DIP switch setting determines airflow during low
stage cooling operation. Select the CF DIP switch setting
corresponding to the available airflow shown in the furnace
installation instructions that most closely matches the re­quired airflow shown in the air conditioning Product Data
for LOW speed.

Thermostats

for

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
S Dome temperatures may be hot in scroll and bottom

temperatures may be hot in recip.

!

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 up the system:

1. After system is evacuated, fully back seat (open) liquid and
vapor service valves.

2. Unit is shipped with valve stem(s) front seated (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 or User Interface at desired temperat­ure. Be sure set point is below indoor ambient temperature
and is set low enough to energize desired stage.

5. Set room thermostat or User Interface to COOL and fan
control to ON or AUTO mode, as desired. Operate unit for
15 minutes. Check system refrigerant charge.

NOTE: Non--communicating (non--Evolution) Bryant electronic
thermostats are equipped with a 15--minute staging timer. This
timer prevents the 2 --stage system from operating at high-- stage
until unit has been operating in low--stage for 15 minutes unless
there is at least a ±5_F(±2.78_C) difference between room
temperature and thermostat set point. To force high--stage (after a
minimum of 2 minutes in low--stage), adjust the set point at least
±5_ (±2.78_C) below room ambient.

6. Set room thermostat to COOL and fan control to AUTO or
ON as desired. Wait for appropriate time delay(s). Operate
unit for 15 minutes. Check refrigerant charge.

CAUTION

CAUTION

6

System Functions And Sequence Of Operation

The outdoor unit control system has special functions. The
following is an overview of the 2--stage control functions:

Cooling Operation

187A and 180A (containing circuit board HK38EA015 or newer)
models utilize either a 2--stage cooling indoor thermostat or an
Evolution communicating User Interface. With a call for first stage
cooling, the outdoor fan and low--stage compressor are energized.
If low--stage cannot satisfy cooling demand, high--stage is
energized by the second stage of indoor thermostat or User
Interface. After second stage is satisfied, the unit returns to
low--stage operation until first stage is satisfied or until second
stage is required again. When both first stage and second stage
cooling are satisfied, the compressor will shut off.

NOTE: On 187A models, if unit has not operated within the past
12 hrs, or following a unit power--up, upon the next thermostat
high-- or low--stage demand, unit operates for a minimum of 5
minutes in high --stage.

NOTE: With non--communicating (non--Evolution) systems, with
first stage of cooling, (Y1) is powered on; and with second stage of
cooling, (Y1 and Y2) are on.

NOTE: When 2--stage unit is operating at low--stage, system
vapor (suction) pressure will be higher than a standard
single--stage system or high --stage operation.

NOTE: Outdoor fan motor will continue to operate for one
minute after compressor shuts off, when outdoor ambient is greater
than or equal to 100_F (37.78_C). This reduces pressure
differential for easier starting on the next cycle.

Communication and Status Function Lights

For Evolution Control Only, Green communications (COMM)
Light

A green LED (COMM light) on the outdoor board (see Fig. 6)
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 6 for codes and definitions.

NOTE: Only one code will be displayed on the outdoor unit
control board (the most recent, with the highest priority).

Utility Interface

With Evolution Control

The utility curtailment relay should be wired between R and Y2
connections on the control board for Evolution Communicating
Systems only (see Fig. 6.) This input allows a power utility device
to interrupt compressor operation during peak load periods. When
the utility sends a signal to shut the system down, the User
Interface will display, “Curtailment Active”.

One Minute Stage Change Time Delay on 187A Models

When compressor changes stages from high to low or low to high,
there is a 1--minute time delay before compressor restarts. The
outdoor fan motor remains running.

Compressor Operation on 187A Models

When the compressor operates in high-- stage operation, the motor
rotates clockwise. Both the lower and upper pistons are eccentric
with the rotating crankshaft and both compress refrigerant.

When the compressor operates in low--stage operation the motor
reverses direction (rotates counterclockwise). The lower piston
becomes idle and the upper piston compresses refrigerant. The

start and run windings are reversed.

180A / 187A

UTILITY RELAY

UTILITY SIGNAL

OPEN RELAY

*

SUPPLIED BY UTILITY PROVIDER

*

Fig. 6 -- 2--Stage Control Board

7

LLS

Liquid Line Solenoid

MODEL
PLUG

A06526

Compressor Operation on 180A Models

The basic scroll design has been modified with the addition of an
internal unloading mechanism that opens a by--pass port in the first
compression pocket, effectively reducing the displacement of the
scroll. The opening and closing of the by--pass port is controlled
by an internal electrically operated solenoid. The modulated scroll
uses a single step of unloading to go from full capacity to
approximately 67% capacity.

A single speed, high efficiency motor continues to run while the
scroll modulates between the two capacity steps. Modulation is
achieved by venting a portion of the gas in the first suction pocket
back to the low side of the compressor, thereby reducing the
effective displacement of the compressor.

Full capacity is achieved by blocking these vents, thus increasing
the displacement to 100%. A DC solenoid in the compressor
controlled by a rectified 24 volt AC signal in the external solenoid
plug moves the slider ring that covers and uncovers these vents.

The vent covers are arranged in such a manner that the compressor
operates at approximately 67% capacity when the solenoid is not
energized and 100% capacity when the solenoid is energized. The
loading and unloading of the two step scroll is done ”on the fly”
without shutting off the motor between steps.

NOTE: 67% compressor capacity translates to approximately

180A / 187A

75% cooling capacity at the indoor coil.

The compressor will always start unloaded and stay unloaded for
five seconds even when the thermostat is calling for high--stage
capacity.

Crankcase Heater Operation

The crankcase heater is energized during unit off cycle regardless
of OAT temperature on 187A models.

The crankcase heater is energized during off cycle below
65_F/18.33_C on 180A models.

Outdoor Fan Motor Operation

The outdoor unit control energizes the outdoor fan any time the
compressor is operating except for low--ambient cooling operation.
The outdoor fan remains energized if a pressure switch or
compressor overload 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 to allow for easier starting during next cooling
cycle.

On 187A models, the outdoor fan remains energized during the
1--minute compressor staging time delay.

On 187A models, the outdoor fan motor is a PSC type. A fan relay
on the control board turns the fan off and on by opening and
closing a high voltage circuit to the motor. It does not change
speeds between low-- and high--stage operation.

On 180A models, the outdoor fan is an ECM type. The motor
control is continuously powered with high voltage. The motor
speed is determined by electrical pulses provided by the PWM
outputs on the control board. The ECM motor RPM adjusts to
outdoor conditions as described in Table 3. The PWM output can
be measured between the PWM1 and PWM2 terminals on the
circuit board with a volt meter set to DC volts.

Table 3 – Outdoor Fan Motor PWM

Outdoor Temp (DC volts, Tolerance +/-- 2%)

MODEL

180A024 9.57 10.88 11.90
180A036 9.06 10.23 11.90
180A048 9.91 11.04 11.90
180A060 10.83 11.70 11.90

NOTE:
For 180A models in low --- ambient cooling, the PWM output for both high--­and low ---stage equals the value f or low ---stage operation below 55_F
(12.8_C).

L O W --- S T A G E

(OAT≤104_F/40_C)

H I G H --- S T A G E

(OAT≤104_F/40_C)

L O W --- & H I G H ---

(OAT>104_F/40_C)

In low ambient cooling (below 55_F/12.78_C) on 187A and 180A
models, the control board cycles the fan off and on.

Time Delays

The unit time delays include:

S Five minute time delay to start cooling or heating operation

when there is a call from the thermostat or user interface. To
bypass this feature, momentarily short and release Forced
Defrost pins.

S Five minute compressor re--cycle 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 On 187A models there is a 1 minute time delay between staging

from low to high and from high to low capacity. On 180A
models there is no delay; the compressor will change from low
to high and from high to low capacity on the fly to meet the
demand.

Low Ambient Cooling

If this unit will be required to operate 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 down to
0_F/--17.78_C without a kit ONLY when using 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/4.4_C OA T. Fan will cycle based on coil and
outdoor air temperature.

Evolution controlled low ambient mode operates as follows:

S Fan isOFF when outdoor coil temp is < (outdoor airtemperature+

3 _F/1.67_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 air temperature +

25_F/13.89_C)or outdoorcoiltemp> 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 pressure switch is ignored for first 3 minutes during low

ambient start up. After 3 minutes, if LPS trips, then outdoor fan
motoris turned off for 10 minutes, with thecompressor 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.

For 180A models, the PWM output for both high-- and low--stage
equals the value for low--stage operation below 55_F (12.8_C).

STAGE

8

Check Charge

All 180A and 187A units must be charged in high stage only.

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 15 ft (4.57 m) of lineset. Adjust charge
by adding or removing 0.6 oz/ft (.018 kg/m) of 3/8 liquid line
above or below 15 ft (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 temperature to
drop to 80_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.

TROUBLESHOOTING

Systems Communication Failure

If communication with the Evolution Control is lost with the user
interface, the control will flash the appropriate fault code. (See
Table 6) Check the wiring to the User Interface, indoor and
outdoor units.

Model Plug

Each control board contains a model plug. The correct model plug
must be installed for or the system to operate properly. (See Table

4.)

The model plug is used to identify the type and size of unit to the
control. On 187A models, the model plug is also used to determine
the start sequence timing for each individual model.

On new units, the model and serial numbers are input into the
board’s memory at the factory. If a model plug is lost or missing at
initial installation, the unit will operate according to the
information input at the factory and the appropriate error code will
flash temporarily. An RCD replacement board contains no model
and serial information. If the factory control board fails, the model
plug must be transferred from the original board to the replacement
board for the unit to operate.

NOTE: The model plug takes priority over factory model
information input at the factory. If the model plug is removed after
initial power up, the unit will operate according to the last valid
model plug installed, and flash the appropriate fault code
temporarily.

Table 4 – Model Plug Information

MODEL

NUMBER

187A024 HK70EZ001 5.1 11
187A036 HK70EZ003 5.1 24
187A048 HK70EZ005 5.1 39
187A060 HK70EZ007 5.1 62

180A024 HK70EZ009 5.1 91
180A036 HK70EZ011 5.1 150
180A048 HK70EZ013 5.1 220
180A060 HK70EZ015 5.1 360

MODEL PLUG

NUMBER

PIN RESISTANCE

(K--- ohms)

P i n s 1 --- 4 Pins 2 - -- 3

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 respond as follows:

1. De--energize the appropriate compressor contactor,

2. Keep the outdoor fan operating for 15 minutes,

3. Display the appropriate fault code (see Table 6).

4. After a 15 minute delay, if there is still a call for cooling and
the LPS or HPS is reset, the appropriate compressor contac­tor is energized.

5. If 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 resume operation with a call
for cooling.

6. If LPS or HPS trips 3 consecutive cycles, the unit operation
is locked out for 4 hours.

7. In the event of a high pressure switch trip or high pressure
lockout, check the refrigerant charge outdoor fan operation
and outdoor coil for airflow restrictions.

8. In the event of a low pressure switch trip or low pressure
lockout, check the refrigerant charge and indoor airflow.

Control Fault

If the outdoor unit control board has failed, the control will flash
the appropriate fault code. (See Table 6) The control board should
be replaced.

Brown Out Protection

If the line voltage is less than 187v for at least 4 seconds, the
appropriate compressor contactor and fan relay are de--energized.
Compressor and fan operation are not allowed until voltage is a
minimum of 190v. The control will flash the appropriate fault
code (see Table 6).

230v Brown--Out Protection Defeated

The brownout feature can be defeated if needed for severe noisy
power conditions. This defeat should always be a last resort to
solving the problem. Defeat is available on the User Interface
setup screen (available with SYSTXBBUID01--C UI) or can be
initiated through the forced defrost pins for non--communicating
systems as follows:

The brownout toggle is accomplished by shorting the defrost pins
from power up with the OAT and OCT sensor connector removed.
After 3 seconds, the status of the force defrost short and the
OAT/OCT as open will be checked. If correct, then the brownout
will be toggled.

S Status code 6 shows the brownout is disabled.
S Status code 5 shows the brownout is active.

After the brownout defeat is set, power down and reinstall the
OAT/OCT sensor and remove the short from the forced defrost
pins. As long as the short on the forced defrost remains, the OAT
and OCT faults will not be cleared. The code will continue to be
flashed.

180A / 187A

9

The control is shipped with the brownout active. The change in
status is remembered until toggled to a new status. A power
down/power up sequence will not reset the status. It may be
necessary to do the toggle twice to cycle to the desired state of the
defeat.

230V Line (Power Disconnect) Detection

If there is no 230v at the compressor contactor(s) when the indoor
unit is powered and cooling demand exists, the appropriate error
code is displayed (see Table 6). Verify that the disconnect is closed
and 230v wiring is connected to the unit.

Compressor Voltage Sensing

The control board input terminals labeled VS, VR and L2 on 187A
models and VS and L2 on 180A models (see Fig. 6) 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.

Contactor Shorted Detection

If there is compressor voltage sensed when there is no demand for
compressor operation, the contactor may be stuck closed or there is
a wiring error. The control will flash the appropriate fault code.

180A / 187A

187A Models, Compressor Thermal Cutout

The control senses the compressor voltage at VR and VS. When
starting or running, a phase difference of the voltages on the inputs
will indicate the thermal protector is closed. If the phase difference
is 5 degrees or less for 10 seconds, the internal protector is open.
The control de--energizes the appropriate compressor contactor for
15 minutes, but continues to operate the outdoor fan. The control
Status LED will flash the appropriate code shown in Table 6. After
15 minutes, with a call for low-- or high--stage cooling, the
appropriate compressor contactor is energized. If the thermal
protector has not re--set, the outdoor fan is turned off. If the call for
cooling or heating 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 is
displayed.

180A Models, Compressor Thermal Cutout

If the control senses the compressor voltage after start-- up, and is
then absent for 10 consecutive seconds while cooling demand
exists, the thermal protector is open. The control de--energizes the
compressor contactor for 15 minutes, but continues to operate the
outdoor fan. The control Status LED will flash the appropriate
code shown in Table 6. After 15 minutes, with a call for low-- or
high--stage 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 is
displayed.

Low or High Contactor Open (187A models) / No 230V
at Compressor (180A

If the compressor voltage is not sensed when the compressor
should be starting, the appropriate contactor may be stuck open or
there is a wiring error. The control will flash the appropriate fault
code. Check the contactor and control box wiring.

models)

187A Models Only, Compressor Start Detection

In low--stage, if the specified start voltage at VR terminal is not
achieved, the start relay is de--energized after 1 second and the
control will flash the appropriate fault code.

In high--stage, if the specified start voltage at VS terminal is not
achieved, the start relay is de--energized after 1 second and the
control will flash the appropriate fault code.

If the specified start voltage is not achieved for 3 consecutive
low-- stage starts, low--stage operation is locked out for 30 minutes.
If the specified start voltage is not achieved for 3 consecutive
high--stage starts, high--stage operation is locked out for 30
minutes. The control will flash the appropriate fault code.

Troubleshooting 187A units for proper switching
between low-- &

Check the suction and liquid pressures at the service valves.
Suction pressure should be reduced by 5--10% when switching
from low to high capacity. There should be a 10--20% increase in
liquid pressure when switching from low to high capacity.
Compressor current should increase 100--250% when switching
from low to high--stage.

high--stages

Troubleshooting 180A units for proper switching
between low-- &

Check the suction pressures at the service valves. Suction pressure
should be reduced by 3--10% when switching from low to high
capacity.

NOTE: The liquid pressures are very similar between low-- and
high--stage operation, so liquid pressure should not be used for
troubleshooting.

Compressor current should increase 20--45% when switching from
low-- to high --stage. The compressor solenoid when energized in
high--stage, should measure 24vac.

When the compressor is operating in low--stage the 24v DC
compressor solenoid coil is de--energized. When the compressor is
operating in high --stage, the 24v DC solenoid coil is energized.
The solenoid plug harness that is connected to the compressor has
an internal rectifier that converts the 24v AC signal to 24v DC.

DO NOT INSTALL A PLUG WITHOUT AN INTERNAL
RECTIFIER.

high--stages

Unloader Test Procedure

The unloader is the compressor internal mechanism, controlled by
the DC solenoid, that modulates between high-- and low--stage. If
it is suspected that the unloader is not working, the following
methods may be used to verify operation.

1. Operate the system and measure compressor amperage.
Cycle the unloader on and off at 30 second plus intervals at
the UI (from low-- to high--stage and back to low--stage).
Wait 5 seconds after staging to high before taking a reading.
The compressor amperage should go up or down at least 20
percent.

2. If step one does not give the expected results, remove the
solenoid plug from the compressor and with the unit run­ning and the UI calling for high--stage, test the voltage out­put at the plug with a DC voltmeter. The reading should be
24 volts DC.

3. If the correct DC voltage is at the control circuit molded
plug, measure the compressor unloader coil resistance. The
resistance should be 32 to 60 ohms depending on com­pressor temperature. If the coil resistance is infinite, much
lower than 32 ohms, or is grounded, the compressor must
be replaced.

10

Table5–2---StageCompressor

(Winding Resistance at 70_F ± 20_ / 21.11_C ± 11.11_C)

Winding 187A024 187A036 187A048 187A060

S t a r t ( S --- C ) 2.74 1.98 1.55 0.74

Run (R --- C) 0.80 0.75 0.48 0.36

Winding 180A024 180A036 180A048 180A060

S t a r t ( S --- C ) 1.40 1.29 1.52 0.60

R u n ( R --- C ) 1.32 0.89 0.64 0.49

MAJOR COMPONENTS

2--Stage Control

The 2--stage control board controls the following functions:

-- Low-- and high--stage compressor contactor operation

-- Outdoor fan motor operation

-- Low ambient cooling

-- Crankcase heater operation

-- Compressor external protection

-- Pressure switch monitoring

-- Time delays

-- On 187A models, start relay and capacitor

Field Connections

On 187A models with non-- communicating (non--Evolution)
system, the 2 --stage control receives 24vac low--voltage control
system inputs through the R, C, Y1, and Y2 connections located at
the bottom of the control board (see Fig. 6). The 187A can be
controlled using a standard 2--stage thermostat or Evolution User
Interface.

All 180A models are part of a complete Evolution communicating
system and use only the ABCD connections on the circuit board.
The 180A must be controlled using an Evolution User Interface for
proper equipment staging and operation

2--Stage Compressor

The 2--stage compressor contains motor windings that provide
2--pole (3500 RPM) operation. Refer to Table 5 for correct winding
resistance.

Compressor Internal Relief

The compressor is protected by an internal pressure relief (IPR)
which relieves discharge gas into compressor shell when
differential between suction and discharge pressures exceeds 500 -­550 psi on 187A models and 550 -- 625 psi on 180A models. The
compressor is also protected by an internal overload attached to
motor windings.

Compressor Control Contactors

The contactor(s) have a 24 volt coil. The electronic control board
controls the operation of the appropriate contactors.

TEMPERATURE THERMISTORS

Thermistors are electronic devices which sense temperature. As the
temperature increases, the resistance decreases. Thermistors are
used to sense outdoor ambient (OAT) and coil temperature (OCT).
Refer to Fig. 7 for resistance values versus temperature.

If the outdoor ambient or coil thermistor should fail, the control
will flash the appropriate fault code (see Table 6.)

THERMISTOR CURVE

90

80

70

60

50

40

30

20

RESISTANCE (KOHMS)

10

0

0

20

40

60

80

100

(-17.77)

(-6.67)

(4.44)

(15.56)

(26.67)

TEMPERATURE °F (°C)

(37.78)

Fig. 7 -- Resistance Values Versus Temperature

IMPORTANT: Outdoor air thermistor and coil thermistor are

factory mounted in the final locations. Check to insure thermistors
are mounted properly per Fig. 8 and Fig. 9.

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 If the outdoor air sensor indicates ≥ 10_F/5.56_Cwarmerthan

the coil sensor (or) the outdoor air sensor indicates ≥
20_F/11.11_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 as shown in Table 6.

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.

If the OCT sensor should fail, low ambient cooling will not be
allowed.

120

(48.89)

A08054

180A / 187A

11

OAT Thermistor must be locked in
place with spherical nib end facing to­wards the front of the control box

OCT Thermistor must be
secured tight on the liquid
tube.

Fig. 8 -- Outdoor Air Thermistor (OAT) Attachment

180A / 187A

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.

Fig. 9 -- Outdoor Coil Thermistor (OCT) Attachment

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.

12

Status Codes

Table 6 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 seconds ON and the long flash

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 6 gives possible causes and actions
related to each error.

EXAMPLE:

3 short flashes followed by 2 long flashes indicates a 32 code.
Table 6 shows this to be low pressure switch open.

is 1.0 second ON. Time between flashes is 0.25 seconds. Time

Table 6 – TROUBLESHOOTING

AMBER

OPERATION

Standby – no call for unit operation None

low --- stage Cool/Heat Operation None 1, pause Normal operation
high--- stage Cool/Heat Operation None 2, pause Normal operation

* Sequence: Compressor contactor is de --- energized and outdoor fan is energized for up to 15 minutes. If demand still exists, control will energize compressor

contactor after 15 minute delay. If fault is cleared, unit will resume operation. If fault still exists, fan shuts off, and error code continues to flash. Control will
attempt re ---start every 15 minutes. Cycling low voltage defeats the 15 minute delay.

FAULT

System Commu­nications Failure

Invalid Model Plug 25

High Pressure
Switch Open

Low Pressure
Switch Open
Control Fault 45 Outdoor unit control board has failed. Control board needs to be replaced.

Brown Out (230 v) 46

No 230v at Unit 47

Outdoor Air Temp
Sensor Fault
Outdoor Coil Sen­sor Fault

Thermistors out of
range

l o w --- s t a g e T h e r ­mal Cutout

high---stage Ther­mal Cutout

Contactor Shorted 73

No 230V at Com­pressor
(180A Only)
l o w --- s t a g e D id N o t
Start
(187A Only)
l o w --- s t a g e D id N o t
Start 3 times
(187AOnly)
h i g h --- s t a ge D i d
Not Start
(187A Only)
h i g h --- s t a ge D i d
Not Start 3 times
(187A Only)
l o w --- s t a g e T h e r ­mal Lockout

high---stage Ther­mal Lockout
Low Pressure
Lockout

High Pressure
Lockout
Low Contactor
Open
(187A Only)
High Contactor
Open
(187A Only)

LED

FLASH

POSSIBLE CAUSE AND ACTION

CODE

On solid, no

flash

16 Communication with user interface lost. Check wiring to User Interface,

31*

32* Low pressure switch trip. Check refrigerant charge and indoor air flow

53

55 Coil sensor not reading or out of range. Ohm out sensor and check wiring.

56

71*

72*

74

75

76

77

78

81

82

83

84

85

87

Normal operation

indoor and outdoor units

Control does not detect a model plug or detects an invalid model plug. Unit
will not operate without correct model plug.
High---pressure switch trip. Check refrigerant charge, outdoor fan operation
and coils for airflow restrictions.

Line voltage < 187v for at least 4 seconds. Compressor and f a n operation
not allowed until voltage>
There is no 230v at the contactor when indoor unit is powered and cooling/
heating demand exists. Verify the disconnect is closed and 230v wiring is
connected to the unit.
Outdoor air 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 operation detected then disappears while low---stage demand
exists. Possible causes are internal compressor overload trip or start relay
and capacitor held in circuit too long(if installed)
Compressor operation detected then disappears while high---stage demand
exists. Possible causes are internal compressor overload trip or start relay
and capacitor held in circuit too long (if installed)
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. Con­tactor may be stuck open or there is a wiring error.

Specified start voltage at VR terminal was not achieved in low ---stage. Start
relay was de--- energized after 1 second.

For 3 consecutive low---stage starts, the specified start voltage at VR terminal
was not achieved & start relay was de--- energized. l ow --- stage locked out for
30 minutes.

Specified start voltage at VS terminal was not achieved in high ---stage. Start
relay was de--- energized after 1 second.

For 3 consecutive high---stage starts, the specified start voltage at VS termi­nal was n ot achieved & start relay was de--- energized. high ---stage locked
out for 30 minutes.
Thermal cutout occurs in th ree consecutive l ow/ high --- stage cycles. l ow --­stage locked out for 4 hours or until 24v power recycled.

Thermal cutout occurs in three consecutive high/low---stage cycles. high --­stage locked out for 4 hours or until 24v power recycled.
Low pressure switch trip has occurred during 3 consecutive cycles. Un it
operation locked out for 4 hours or until 24v power recycled.

High pressure switch trip h as occurred during 3 consecutive cycles. Unit
operation locked out for 4 hours or until 24v power recycled.

Compressor voltage not sensed when compressor should be starting. low --­stage contactor may be stuck open or there is a wiring error.

Compressor voltage not sensed when compressor should be starting. high --­stage contactor may be stuck open or there is a wiring error.

190v. Verify line voltage.

180A / 187A

13

Outdoor Sensor

Humidifier Solenoid

Valve

Remote Room

Outdoor Sensor *

Humidifier Solenoid

Valve *

Remote Room

Outdoor Sensor

Humidifier Solenoid

Valve

Remote Room

r

Variable Speed

Thermidistat

RVS/Heat Stage 2 O/W2/B

Heat Stage 1 W/W 1

Compressor Low Y1

Compressor High Y/Y2

Fan G

24VAC Hot Heating Rh

24VAC Hot Cooling Rc

Dry Contact 1 D1

Dry Contact 2 D2

24VAC Common C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Return

SRTN

E d g e T h e r m i d is t a t M o d e l s T 6 --- PR H --- 0 1 & T 6 --- N R H --- 0 1

SRTN

w/ Fan Coil & 2 --- Stage Air Conditioner

Fan Coil

O

Y1

W1

W2

Y/Y2

G

R

DH

C

Air Conditione

REMOVE J2
JUMPER FOR
HEAT STAGING

REMOVE J1 FOR
DEHUMIDIFY
MODES

Two-Stage

Y1

Y2

A08060

Thermidistat

Heat Stage 2 O/B W2 W 2

Heat Stage 1 W/W1 W 1

Cool Stage 1 Y1 / W2 Y1

Cool Stage 2 Y/Y2 Y/Y2 Y/Y2

Fan G G

R

C

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc

Dry Contact 1 D1

Dry Contact 2 D2 DHUM

24VAC Common C COM C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Com SRTN

Variable Speed

Furnace

2-Stage

Air Conditioner

* Indicates connection may not be required / available.

A09338

T h e r m i d i s ta t M o d e l T 6 --- P R H 0 1 --- A & T 6 --- N R H 0 1 --- A

w/ VS Furnace & 2 - -- Stage Air Conditioner

180A / 187A

THERMIDISTAT

RVS/Heat Stage 2 O/W2/B W2

Heat Stage 1 W/W1 W1

Compressor Low Y1 Y1 Y1

Compres sor High Y/Y2 Y/Y2 Y2

Fan G G

24VAC Hot Heating Rh R R

24VAC Hot Cooling Rc

Dry Contact 1 D1

Dry Contact 2 D2 DHUM

24VAC Common C COM C

Humidify HUM

Outdoor Air Temp OAT

Remote Room Sensor RRS

OAT/RRS Return

SRTN

T h e r m i d i s ta t M o d e l s T 6 --- P R H --- 0 1 & T 6 --- N R H --- 0 1

SRTN

w/ Furnace & 2 - -- Stage Air Conditioner

VARIABLE SPEED

FURNACE

LEGEND

24 VOLT FACTORY WIRING

24 VOLT FIELD WIRING

FIELD SPLICE CONNECTION

RELAY SPDT, PILOT DUTY
24-V COIL (HN61KK324)
OR EQUIVALENT

R1

H

HUMIDISTAT, OPENS ON
HUMIDITY RISE (HL38MG026)

AIRFLOW SELECTOR

AFS

TWO-STAGE

AIR CONDITIONER

A08057

A02005

Fig. 10 -- Thermidistat Wiring with 2--Stage Puron refrigerant Air Conditioner

14

User Interface

P

Fan Coil

Communicating AC//H

D

C

B

A

Humidifier

C

24vac

D

C

B

A

OAT

RYOWCHUM

D

C

B

A

A03076

Fig. 11 -- Evolution Furnace or Fan Coil Wiring with Communicating 2--stage AC

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 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 balanced port 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 balanced port Puron TXV metering device.

180A / 187A

15

180A / 187A

E2009 Bryant Heating & Co oli ng Systems D 7310 W. Morris St. D Indianapolis, IN 46231 Printed in U.S.A. Edition Date: 07/09

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notic e and without incurring obligations.

16

Catalog No. II180A--- 0 6

Replaces: II180A--- 05