CARRIER Air Conditioner/heat Pump(outside Unit) Manual L0604185

User Manual: CARRIER CARRIER Air conditioner/heat pump(outside unit) Manual CARRIER Air conditioner/heat pump(outside unit) Owner's Manual, CARRIER Air conditioner/heat pump(outside unit) installation guides

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Installation

Instructions
TABLE

OF CONTENTS
PAGE

SAFETY

CONSIDERATIONS

INSTALLATION

.......................

RECOMMENDATIONS

INSTALLATION
Check

Equipment

Step 2 -

Install on Solid Pad ......................

Step 3 -

Clearance

Requirements

Step 4 -

Operating

Ambient

Step 5 -

Elevate

Step 6 -

Install TXV

Step 7 -

Install Liquid

Step 8 -

Make Piping

Step 9 -

Make Electrical

Unit

instruction

manual

starting

the

MAJOR

........................

Unless

otherwise

instructions
Information

noted,

information

these

installation

pertain to both 25HNA6
and 25HNA9 series units.
that is unique to the 25HNA6 series will be identified

as such; likewise information
will also be identified.

that is unique to the 25HNA9

series

3 - 4
4

Line Solenoid
Connections

Valve (LSV)

CARE
PURON

.....

..............

Connections

Crankcase

Charge

COMPONENTS

CHECKS

............

Heater

7 - 8

.............

......................

Selections

..................

8
9

.....................

9 - 12
12 - 13

..........................
........................

14
14 - 17

.................................

AND MAINTENANCE
REFRIGERANT

......................
QUICK

5
5 - 7

..............................

TROUBLESHOOTING
FINAL

..................

Step 14 - System Functions and Sequence
Operation
.................................
Step 15 - Check

before

...............

......................

Accessories

Step 13 - Start-Up

NOTE:
Read the entire
installation.

& Jobsite

............................

Step 12 - Make Airflow

/ 25HNA9

2
3 - 13

Step 1 -

Step 11 - Install

Fig. 1 - 25HNA6

.............

..............................

Step 10 - Compressor

A05240

REFERENCE

19
GUIDE

SAFETY
CONSIDERATIONS
Improperinstallation,adjustment,
alteration,service,
maintenance,
orusecancause
explosion,
fire.electrical
shock,
or
otherconditions
whichmaycause
death,
personal
injury,or
property
damage.
Consult
aqualified
installer,
service
agency,
or
yourdistributor
or branch
forinformation
or assistance.
The
qualified
installer
oragency
mustusefactory-authorized
kitsor
accessories
when
modifying
thisproduct.
Refer
totheindividual
instructions
packaged
withthekitsoraccessories
when
installing.
Follow
allsafety
codes.
Wear
safety
glasses,
protective
clothing,
andworkgloves.
Usequenching
clothforbrazing
operations.
Havefire extinguisher
available.
Readtheseinstructions
thoroughly
andfollowallwarnings
or cautions
included
in
literature
andattached
totheunit.Consult
localbuilding
codes
andNational
Electrical
Code
(NEC)
forspecial
requirements.
Recognize
safety
information.
Thisisthesafety-alert
symbol/_
When
youseethissymbol
ontheunitandin instructions
or
manuals,
bealerttothepotential
forpersonal
injury.Understand
these
signalwords;DANGER.
WARNING,
andCAUTION.
These
wordsareused
withthesafety-alert
symbol.
DANGER
identifies
themostserious
hazards
whichwillresultin severe
personal
injuryor death.
WARNING
signifies
hazards
which
couldresultinpersonal
injuryordeath.
CAUTION
is used
to
identify
unsafe
practices
whichmayresultin minorpersonal
injuryor product
andproperty
damage.
NOTEis usedto
highlight
suggestions
whichwillresult
inenhanced
installation,
reliability,
oroperation.

ELECTRICAL
SHOCK
HAZARD
Failure
tofollowthiswarning
couldresult
in personal
injuryordeath.
Before
installing,
modifying,
orservicing
system,
main
electrical
disconnect
switch
must
beintheOFFposition.
There
maybemore
than1disconnect
switch.
Lockout
andtagswitch
withasuitable
warning
label.

UNITOPERATION
ANDSAFETY
HAZARD
Failure
tofollowthiswarning
could
result
inpersonal
injury
orequipment
damage.
Puron
_ refrigerant
systems
operate
athigher
pressures
than
standard
R-22systems.
DonotuseR-22service
equipment
orcomponents
onPuron
_refrigerant
equipment.

INSTALLATION
RECOMMENDATIONS
NOTE:Insome
cases
noise
inthelivingarea
hasbeen
traced
to
gaspulsations
fromimproper
installation
ofequipment.
1.Locate
unitaway
fromwindows,
patios,
decks,
etc.where
unitoperation
sound
maydisturb
customer.
2.Ensurethatvaporandliquidtubediameters
are
appropriate
forunitcapacity.
3.Runrefrigerant
tubes
asdirectly
aspossible
byavoiding
unnecessary
turns
andbends.
4.Leave
some
slackbetween
structure
andunittoabsorb
vibration.
5.Whenpassing
refrigerant
tubesthrough
thewall,seal
opening
withRTVorotherpliable
silicon-based
caulk.
(See
Fig.2.)
6.Avoiddirect
tubingcontact
withwater
pipes,
ductwork,
floorjoists,
wallstuds,
floors,
andwalls.
7.Donotsuspend
refrigerant
tubingfromjoistsandstuds
witha rigidwireor strap
whichcomes
indirect
contact
withtubing.(See
Fig.2.)
8.Ensure
thattubinginsulation
ispliableandcompletely
surrounds
vapor
tube.
9.When
necessary,
usehanger
straps
whichare1 in.wide
andconform
toshape
oftubing
insulation.
(See
Fig.2.)
10.Isolate
hanger
straps
frominsulation
by usingmetal
sleeves
benttoconforna
toshape
ofinsulation.
When
outdoor
unitisconnected
tofactory-approved
indoor
unit.
outdoor
unitcontains
system
refrigerant
charge
foroperation
with
ARIrated
indoor
unitwhen
connected
by15ft.offield-supplied
or factory
accessory
tubing.
Forproper
unitoperation,
check
refrigerant
charge
usingcharging
information
located
oncontrol
boxcover
and/or
intheCheck
Charge
section
ofthisinstruction.
IMPORTANT:
Maximum
liquid-line
sizeis3/8-in.
ODforall
residential
applications
including
longlineapplications.
IMPORTANT:
Always
installthefactory-supplied
liquid-line
filterdrier.
Obtain
replacement
filterdriers
fromyourdistributor
orbranch.

INSTALLATION
NOTE: Avoid contact between tubing and structure
INDOOR WALL LIQUID TUBE

INSULATION
THROUGH THE WALL

HANGER STRAP_k

_y,,,,_J

(AROUND VAPOR

X. k_

OIST
INSULATION

VIEW

TOP

/
UNIT BASE PAN
DIMENSIONS

FROM

VAPOR TUBE

TIEDOWN

KNOCKOUT

LOCATIONS

1"MIN. ------I

I--,--

1/2 x 40

11 5/8

6 13/16

28 3/4

1/2 X 33

10 1/16

5 5/8

23 3/4

LIQUID TUBE
SUSPENSION

A05242

Fig.

A94026

Fig. 2 -

Connecting

Tube

and

obtain required
R-22 retrofit.
STEP

unit

1 --Check

Unpack

Heat

changes

Using

Puron(R)

for specific

Equipment

and Job

Refrigerant

applications

and for

Site

STEP 3 --Clearance
When installing,
wiring, refrigerant

carton

taking

care not to damage

Equipment
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

STEP

2 --Install

on a Solid,

job specifications.

Level Mounting

Pad

in./ft.)

per

Requirements
allow sufficient
space for airflow clearance.
piping, and service. Allow 30-in. clearance to

so water,

snow.

or ice from

roof

or eaves

locate

at least

cannot

fall

on unit.

On rooftop
surface.

applications,

STEP 4 --Operating

File claim with shipping

_+2° (_+3/8

service end of unit and 48 in. above unit. For proper airflow, a
6-in. clearance on 1 skle of unit and 12 in. on all remaining sides
must be maintained.
Maintain a distance of 24 in. between units.
directly

Remove

Locations

NOTE:
Unit nmst be level to within
compressor
manufacturer
specifications.

Position

Unit

Move to final location.
unit.
Inspect

Pumps

Knockout

Installation

Specifications
for this unit in residential new construction
market
require the outdoor
unit, indoor unit, refrigerant
tubing sets,
metering device, and filter drier listed in presale literature. There
can be no deviation.
Consult
the Service
Manual
- Air
Conditioners

3 - Tiedown

unit

6 in. above

roof

Ambient

The minimum
outdoor
operating
ambient in cooling
mode is
55°F without low ambient cooling
enabled and the maximum
outdoor

operating

Infinity "
25HNA9),

ambient

in cooling

mode

is 125°F.

communicating
systems only (for both 25HNA6
low ambient cooling is available to 0°F.

On
and

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.

The maximum
outdoor operating
ambient in heating mode is
66°F on all models.
Continuous
operation in the heating mode is

3 to determine

base pan size and knockout

STEP 5 --Elevate

For hurricane

tie downs,

Certification

(Professional

contact

hole location.

distributor

Engineer),

for details

wind baffles.
System
Air
Refrigerant

units

exposed

Consult the
Conditioners

to winds

above

to building.

5 mph may require

Service Manual
- Residential
Split
and Heat Pumps
Using
Puron(R)

for wind baffle construction.

Unit

if required.

unit and minimize transmission
of vibration
local codes governing
rooftop applications.

Roof mounted

to -30°F.

and PE

On rooftop applications,
mount on level platform or frame. Place
unit above a load-bearing
wall and isolate unit and tubing set
from structure.
Arrange
supporting
members
to adequately
support
Consult

approved

UNIT

OPERATION

HAZARD

Failure to follow this caution may result in equipment
damage or improper operation.
Do not allow water
Elevate

unit

per local

clearance
above
drainage of unit.

and/or
climate

estimated

ice to build up in base pan.
and code requirements

snowfall

level

and ensure

to provide
adequate

7. Connect

equalizer

on vapor
8. Attach

UNITOPERATION
HAZARD
Failure
tofollowthiscaution
mayresult
inequipment
damage
orimproper
operation.
Locate
theunitin suchawaythatit is stable
inall
circumstances
including
adverse
weather
conditions.
STEP6--InstallTXV
NOTE:Applies
tonon-TXV
indoor
unitsonly.If installing
a
ratedandapproved
indoorcoilwithouta factoryinstalled
Puron(_
TXV,remove
andreplace
thefixedorifice
orR-22TXV
expansion
device
withahardshutoff
Puron
TXV.
Thethermostatic
expansion
valveis specifically
designed
to
operate
withPuron(a)
refrigerant.
DonotuseanR-22TXV.An
existing
R-22TXVmustbereplaced
witha factory-approved
TXVspecifically
designed
for Puronrefrigerant.
Referto
Product
Data
Digest
fortheappropriate
TXVkitnumber.

using

tube of TXV to 1/4-in.

TXV

bulb

clamps

9. Proceed

to horizontal

provided.

insulation
tape.
sensing bulb.

_.10

equalizer

fitting

line adapter.

See

section

Insulate
Fig.

with remainder

bulb

4 for

of suction

line

with field-supplied

correct

positioning

of unit installation.

O'CLOCK
SENSING

2 O'CLOCK]

L_'SUCTION

TUBE
8 O'CLOCK

4 O'CLOCK

7/8 IN. OD & SMALLER

LARGER

THAN 7/8 IN. OD

A81032

Fig.

UNITOPERATION
HAZARD
Failure
tofollowthiscaution
mayresult
inequipment
damage
orimproper
operation.
Allindoor
coilunitsmust
beinstalled
withahard
shut
offPuron®
TXVmetering
device.

Replacing

indoor

The

TXV

coil as possible

mounting

the

inlet

should

be mounted

and in a vertical,
tube

upright

vertically

susceptible
to malfunction
down. A factory-approved

down.

as close to the
position.
Valve

Avoid
is

due to debris if inlet tube is facing
filter drier must be installed in the

1. Pump system
2. Remove
cabinet.

Installing

TXV in Place

1. Pump

system down

to 2 psig and recover

refrigerant.

2. Remove hex nut from piston body. Use backup
fan coils.
3. Remove

and

discard

factory-installed

piston.

NOTE:

hex nut. Finger

If the piston

not function

tighten

is not removed

sure

the body,

TXV

will

properly.

4. Remove

using

a backup

R-22

5. Using wire cutters,
tube inside cabinet.
6. Remove

damage

bulb from vapor

7. Braze equalizer

DAMAGE

damage

adapter

to suction

tube off flush

closed.

damage

with vapor

Use protective

barrier

to drain pan.

tubing.

or valve,

TXV support

equalizer
hole)

to attach TXV to distributor.

clamp (removed

in item 3).

See Fig. 4 for correct

tube through

in fitting

panel

inlet of TXV. marked

excessive

suction
and

"IN"

heat which could damage

positioning

connection

install

in same
supplied

fitting

to liquid

opening
panel

line. Avoid

valve.

13. Install vapor elbow with equalizer adapter to vapor line of
line set and vapor connection
to indoor coil. Adapter has
swivel
outlet.

Use backup wrench to avoid damage to tubing or valve.
Sweat inlet of TXV. marked "IN" to liquid line. Avoid
excessive heat which could damage valve.
with equalizer

flare

the equalizer tube of Puron TXV through
opening in fitting panel prior to replacing

to tubing

a 1/4-in.

elbow

10. Attach TXV bulb to vapor tube inside cabinet,
location as original was when removed,
using

12. Sweat

TXV with wet cloth or

5. Install TXV on indoor
coil liquid line. Sweat
adapter to inlet of indoor coil and attach to TXV

wrench

8. Install TXV with 3/8-in. copper tubing through small hole
in service panel. Use wrench and backup wrench, to avoid

(large
place.

HAZARD

Use a brazing shield and wrap
use heat sink material.

nut driver.

tube inside cabinet.

stub-tube

to prevent

a 5/16-in.

front of

to tubing.

cut equalizer

copper bulb clamps.
sensing bulb.

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

6. Install vapor

TXV

to prevent

refrigerant.

panel from

using

11. Route

EQUIPMENT

and fitting

clamp

9. Reinstall

nut plus 1/2 turn.
from

panel

Teflon seal is in place.
4. Reinstall

Coil

3. Remove TXV support
Save the clamp.

fitting panel around

wrench

Bulb

down to 2 psig and recover

IMPORTANT:
Route
suction line connection

of Piston

of Sensing

Indoor

coil access

necessary

liquid line.

Position

TXV on R-22

connections
IMPORTANT:

4 -

tube

of line set and suction connection
to indoor coil. Adapter
has a 1/4-in. male connector for attaching equalizer tube.

male connector

for attaching

equalizer

tube.

14. Connect equalizer tube of TXV to 1/4-in. equalizer fitting
on vapor line adapter.
Use backup
wrench to prevent
damage
15. Proceed

to equalizer

fitting.

with remainder

of unit installation.

STEP

7 --In

Solenoid
For

Long-Line

Applications,

Install Liquid-Line

Valve (LSV)

refrigerant

piping

arrangements

with

equivalent

lengths

greater than 80 ft. and/or when elevation
difference
between
indoor
and outdoor
unit is greater
than _+20 ft.. follow all
requirements
of the Long-Line
Guideline--Air
Conditioners
and
Heat Pumps
Using
Long-Line
Guideline.

UNIT
Failure
damage

Puron®
refrigerant.
If required
by
install LSV kit, part no. KHALS0401LLS,

toward

included

with accessory

IMPORTANT:
STEP

outdoor

unit. Follow

the Installation

to follow this caution
or improper operation.

Piping

Instructions

outdoor

AND UNIT

DAMAGE

this warning

could

result in personal

HAZARD

Failure
damage

to follow this caution
or improper operation.

Observe

the following:

• Use a brazing

HAZARD

to follow
this caution
or improper operation.

with wet cloth or use a heat sink

80 ft., substantial
capacity and performance
Following
the recommendations
in the

may

result

sealed during

in equipment

Outdoor

Unit Connected

Outdoor

unit

Check

Connections
Information

and Recommended

is Specific

Manual-Residential
Split-System
Pumps Using Puron®
Refrigerant

contains

to Factolw-Approved
correct

system

diameters.

Indoor

refrigerant

Air
will

Unit:

charge

to 25HNA6

refrigerant

Liquid

charge

and Vapor

and 25HNA9

for maximum

Tube

efficiency.

Diameters

(In.)

Models
R&TED

LIQUID

VAPOR

(up to 80 ft. T.E.L)

UNIT SIZE
Connection
Diameter

Notes:
t.
,.,
2.
3.

for

operation
with factory approved
ARI rated indoor unit with
highest sales volume
when connected by 15 ft. of field-supplied
or factory-accessory
tubing, and factory supplied
filter drier.

installation.

Table 1--Refrigerant

losses can
Application

reduce these losses. Refer to Table 1 for field tubing
Refer to Table 2 for accessory requirements.

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

in equipment

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

Guideline
and Service
Conditioners
and Heat

Failure
damage

result

material.

beyond
occur.

DAMAGE

may

shield.

• Wrap service valves

Relieve
pressure
and recover all refrigerant
before
system repair or final unit disposal. Use all service
ports and open all flow-control
devices,
including
solenoid valves.

UNIT

in equipnmnt

Connections

INJURY

Failure to follow
injury or death.

result

unit.

UNIT

PERSONAL
HAZARD

may

kit.

Flow arrow must point toward

8 --Make

HAZARD

If ANY refrigerant tubing is buried, provide a 6 in. vertical
rise at service valve. Refrigerant tubing lengths up to 36 in.
may be buried without further special consideration.
Do
not bury lines longer than 36 in.

specifically
designed
for Puron®
refrigerant
heat pumps. LSV
should be installed within 2 ft. of outdoor unit with flow arrow
pointing

DAMAGE

Tube
Diameter

Connection
Diameter

Tube
Diameter

25HNA624

3/8

5/8

25HNA636

3/8

3/4

25HNA648

3/8

7/8

25HNA660

3/8

7/8

1 1/8

25HNA924

3/8

3/4

25HNA936

3/8

3/4

7/8

25HNA948

3/8

7/8

25HNA960

3/8

7/8

1 1/8

Tube diameters are for total equivalent lengths (TE.L.) up to 80 ft. Consult the Long Line Guideline
refrigerant.
Do not apply capillary tube or the fixed orifice indoor coils to these units.
T.E.L. - Total Equivalent Length

Air Conditioners

and Heat Pumps using Puron@

REQUIRED
Accessory
Crankcase

Table 2--Accessory

Usage

FOR LOW-AMBI-

REQUIRED

ENT APPLICATIONS
(Below 55 °F)
Standard

Heater

FOR LONG LINE

REQUIRED

APPLICATIONS*
(Over 80 ft.)
Standard

FOR SEA

COAST APPLICATIONS
(Within 2 miles)
Standard

Standard with Infinity Control
Evaporator

Freeze Protection

Winter

(Low Ambient not allowed with noncommunicating thermostat)

Standard on 25HNA6 models.

Standard on 25HNA6 modets.

Not required on 25HNA9 models

Not required on 25HNA9 modets

Standard on 25HNA6
modets.

since compressor

Standard with infinity Control
(Low Ambient not allowed with non-

Start Control

communicating thermostat)

Compressor

Start Assist Capacitor
and Relays

Low-Ambient

Control

always starts

Not required on 25HNA9
models since compressor

always starts

unloaded,

Standard with Infinity Control (Low
ambient not allowed with non-commu-

always starts unloaded.
No

nicating thermostat)
Support

Feet

Liquid Line Solenoid

Recommended
Valve

Ball Bearing Fan Motor
Puron Balance Port Hard Shut-Off
TXV

Recommended

Yes

Standard

Yes1-

Standard

Yes1-

Yest

For Tubing Set lengths between 80 and 200 ft. horizontal or 20 ft. vertical differential (Total Equivalent Length),
ers and Heat Pumps using Puron(_) refrigerant.
tRequired on all indoor units. Standard on all new Puron refrigerant fan coils and furnace coils.

refer to the Long Line Guideline

Air Condition-

$ Information is specific to 25HNA6 and 25HNA9 models.
Install Liquid-Line

Filter

Drier Indoor

Refrigerant

Refer to Fig. 5 and install filter drier as follows:
1. Braze 5-in.

Connect

liquid tube to the indoor coil.

2. Wrap filter drier with damp cloth.
3. BrazefilterdriertoabaveS-in.
point towards indoor coil.
4. Connect

liquid tube.Flowarrowmust

and braze liquid refrigerant

tube to the filter drier.

Tubing
vapor

connection

tube

valves

(see Table 1).

Install

Adapter

Outdoor

to fitting

outdoor

unit

retainer

2. Check outdoor piston
unit rating plate.

holding

outdoor

size with matching

3. Locate plastic bag taped to unit containing
Teflon_R3

washer

open end of liquid service
DAMAGE

HAZARD

Failure to follow this caution
or improper operation.
Installation

of filter

drier

may result in equipment
in liquid

damage

5. Remove adapter
to liquid service

Sweat

piston

in liquid

number

listed on

adapter

tube.

from bag and install

wdve.

tube from bag and connect threaded nut
valve. Tighten nut finger tight and then

with wrench tighten an additional
DO NOT OVERTIGHTEN!

line is required.

service

Tube

1. Remove plastic
service valve.

4. 4. Remove
UNIT

vapor

1/2 turn (15 ft-lb).

Connections

UNIT

DAMAGE

HAZARD

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

valves
must be wrapped
such as a wet cloth.

a heat-sink

Use refrigerant
grade tubing. Service valves are closed from
factory and ready for brazing. After wrapping
service valve with
A05227

Fig. 5 - Liquid

Line

Filter

Drier

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.

Refrigerant

Tubing

and Indoor

Coil

I EVACUATE

Evacuate

[BREAK VACUUM WITH DRY NITROGEN
UNIT

DAMAGE

HAZARD

Failure to follow this caution may result in equipment
damage or improper operation.
Never use the system

compressor

as a vacuum

[EVACUATE I

pump.

[BREAK VACUUM WITH DRY NITROGEN

Refrigerant
tubes and indoor coil should be evacuated
using the
recommended
deep vacuum
method
of 500
microns.
The
alternate
outlined
nitrogen.

[EVACUATE]

triple evacuation
method may be used if the procedure
below is followed. Always
break a vacuum with dry
CHECK

Deep Vacuum

The deep vacuum

method

requires

a vacuum

pump

capable

TIGHT,

FOR

(IF

Method

IT HOLDS

DRY

SYSTEM

VACUUM)

DEEP

pulling a vacuum of 500 microns and a vacuum gage capable of
accurately
measuring
this vacuum
depth. The deep vacuum

I CHARGE SYSTEM

method

Fig.

Method

is the most positive

way of assuring

a system

A95425

is free of air

and liquid water. (See Fig. 6)

Final

Tubing

5000

IMPORTANT:

4500

indoor

7 - Triple

Check
Check

and outdoor

close attention

LEAKIN
SYSTEM

_3500

against

to feeder

tubes are secure

g3000

to be certain

factory

unit has not shifted during

tubes are not rubbing

4000

Evacuation

tubing

shipment.

both

Ensure

each other or any sheet metal. Pay

tubes,

making

sure wire ties on feeder

and tight.

STEP 9 --Make

Electrical

Connections

_2500
2000
VACUUM TIGH'T
TOO WET

15001000

ELECTRICAL
TIGHT
DRY SYSTEM

500

Failure
injury

3
4
MINUTES

SHOCK

to follow

HAZARD

this warning

could

result

in personal

or death.

Do not supply power
box cover removed.

to unit with

compressor

terminal

A95424

Fig, 6 Triple

Evacuation

Deep Vacuum

Graph

Be sure field wiring
and electrical codes,

Method

The triple evacuation
method should only be used when vacuum
pump is only capable of pumping
down to 28 in. of mercury
vacuum and system does not contain
Fig. 7 and proceed as follows:
1. Pump

system

to continue
2. Close

down

operating

service

valves

any liquid

water. Refer

for an additional

and allow pump

and shut off vacuum

to system

as indicated

then be free of any contaminants

in Fig. 7. System
and water vapor.

Operation
and could

not install unit
permissible

NOTE:
unit.

pump.

of unit on improper
affect

unit reliability.

in system

line voltage

constitutes

See unit rating

where

voltage

wire only

between

plate.

may fluctuate

above

Do
or

limits.

Use copper

disconnect

switch

and

and
NOTE:

4. Close service valve and allow system to stand for 1 hr.
During this time, dry nitrogen
will be able to diffuse
throughout
the system absorbing moisture.
this procedure

NOTE:

below

15 minutes.

3. Connect a nitrogen cylinder and regulator
open until system pressure is 2 psig.

5. Repeat

on unit rating plate. Contact local power company for correction
of improper
voltage.
See unit rating plate for recommended
circuit protection device.

abuse

to 28 in. of mercury

complies with local and national fire, safety,
and voltage to system is within limits shown

will

NEC

Install
to handle

sight from
of NEC.
Route

branch
unit

and readily

Ground

circuit

starting

disconnect
current.

accessible

and Power

of adequate

Locate

size per

disconnect

within

from unit, per Section

440-14

Wires

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

STEP

10 --Compressor

Furnish

ELECTRICAL
SHOCK
HAZARD
Failure
to followthiswarning
couldresultin personal
injuryordeath.
Theunitcabinet
musthave
anuninterrupted
orunbroken
ground
tominimize
personal
injuryif anelectrical
fault
should
occur.
Theground
mayconsist
ofelectrical
wireor
metalconduit
wheninstalled
in accordance
withexisting
electrical
codes.
Connect
Ground
Connect

and Power

ground

safety. Connect

Wiles

wire to ground
power wiring

to contactor

in control

as shown

box for

in Fig. 8.

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

to crankcase

starting unit. To furnish
OFF and close electrical
NOTE:

On 25HNA6

minimum

a minimum

of 24 hr before

starting

of crankcase

the compressor

without

heat prior to initial start-up

chattering

noise

and possible

damage

to the compressor.
STEP

11 --Install

Refer to
accessories

Accessories

the individual
when installing.

12 --Make

Only
stats

Using

Airflow

instructions

Airflow

Selection

packaged

Selections

Non-Communicating

The 58CVA/58MVB
low-stage
blower

CONTACTOR

heater

models,

of 12 hours

Heater

power to heater only, set thermostat
disconnect to outdoor unit.

may result in a compressor

STEP

connection

power

Crankcase

for 25HNA6

(Non-Infinity)

for 58CVA/58MVB
variable
operation

with

kits

Series
Thermo-

Furnaces

speed furnaces
to match
the

provide high-and
capacities
of the

compressor
at high and low stages. To select the recommended
airflow
and for adjustments
to the manual
switches
labeled
SWl-5.
AC, and CF on the control board refer to the furnace

FIELD POWER
WIRING

Installation.
Start-UR
and
Operating
Instructions.
The
58CVA/58MVB
utilizes a control center that allows the installing
FIELD GROUND

technician
determines

WIRING

GROUND
LUG
A91056

Fig. 8 Connect

Control

Line Power

to select
the proper
the airflow during high

Airflow for high- and low-stage
CFM per ton or 400 CFM per
SWl-5.

airflows.
The HP switch
stage compressor
operation.

can be calculated at either 350
ton, based on the positions
of

Connections

Wiring

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

control

wiring

grommet

When
using
communicating
(Infinity)
control,
dipswitch
adjustments
are not necessary
on furnaces.
Airflows
are
determined
by Infinity Control setup.
Airflow

Selection

for FK4

or FV4 Fan Coils

for 25HNA6

For 25HNA9
models,
connect to Infinity connections
ABCD
only. Standard non-communicating
thermostats
are not allowed

Series Only
Thermostats

unless it is an emergency
that User Interface is not working
properly and new User Interface is not available.
For emergency
use, connect to standard thermostat connections
R, C, W. Y1. Y2,
and O.

The FV4 provides
high- and low-stage
blower operation
to
match the capacities
of compressor
at high- and low-stage.
To
select
recommended
airflow,
refer
to
FV4
Installation

NOTE:

Instructions.
allows the

When

unit is operating

light will flash rapidly.

Unit will operate

For 25HNA6 models, connect
standard thermostat connections
General

mode,

STATUS

in high stage ONLY.

to ABCD for Infinity Control
R. C, Wl, Y1. Y2. and O.

color-coded,

All wiring must be NEC
incoming power leads.
furnace

transformer,

insulated

Class

fan

(35°C

1 and must

coil

minimum)

wire

be separated

from

transformer,

accessory

transformer
for control power, 24v/40va minimum.
The outdoor
unit requires a minimum of 27va/24vac
control power.
Final

Wiring

IMPORTANT:
to ensure

Check
Check factory

terminations

wiring

are secured

to ensure wires are not in contact

and field wire connections

properly.
with tubing,

Check

wire routing

sheet metal, etc.

Non-Communicating

adjustments
to control
CFM ADJUST setting.

For

other

Digest.

(Non-Infinity)

The FV4 utilizes an Easy Select control board
installing
technician
to select proper airflows.

delay factory
operation.

Information

Use No. 18 AWG
for all installations.

Use

in enmrgency

Using

set

board, select appropriate
HP SIZE and
This fan coil has an adjustable blower off

at 90

combinations

that
For

sec for

high-

equipment

and

low-stage

Consult

Product

blower

Data

STEP 13 --Start-Up

STEP 14 --SYSTEM
OPERATION
The

outdoor

following
UNIT

OPERATION

AND SAFETY

Failure to follow this caution may result in minor
injury, equipment damage or improper operation.
Observe

The

personal

unit in a vacuum

• Do not disable

low pressure

• Dome temperatures

system

has

or at negative

special

of the two-stage

functions.

control

The

functions:

Operation

model

utilizes

either

a standard

for first stage cooling, the outdoor
stage compressor
are energized.

system with refrigerant.

• Do not operate

and Heating

25HNA6

AND SEQUENCE

indoor

thermostat

or Infinity Communication
User Interface. The 25HNA9 models
utilize an Infinity communicating
User Interface only. With a call

the following:

• Do not overcharge

control

is an overview

Cooling

HAZARD

unit

FUNCTIONS

fan, reversing
If low-stage

valve, and low
cannot
satisfy

cooling demand, high-stage
cooling is energized by the second
stage of indoor thermostat or User Interface. After second stage is

pressure.

switch

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

may be hot.

shut off. The reversing
valve will remain energized
until the
control board power is removed or a call for heating in initiated.
PERSONAL
Failure

INJURY

to follow

this caution

Wear safety glasses,
handling refrigerant.

With a call for heating,
the outdoor
fan and compressor
are
energized.
The compressor
will operate in high or low stage
operation,
as needed to meet the heating demand.
When the

HAZARD
may result in personal

protective

clothing,

injury.

and gloves

heating demand is satisfied, the compressor
and fan will shut off.
The reversing valve is de-energized
in the heating mode.

when

NOTE:

When

vapor

two-stage

(suction)

single-stage
NOTE:
minute

unit is operating

pressure

will

system

or high-stage

Outdoor

fan motor

after

compressor

than

system

standard

operation.
will

shuts

at low-stage,

higher

continue

off.

to operate

when

outdoor

for one

ambient

within

the

greater than or equal to 100°F.
ENVIRONMENTAL
Failure to follow
damage.

this caution

Federal

require

result

in environmental

Recover

to propedv

start

during

temperature.
temperature

up the system:
seat

(open)

liquid

front seated (closed)
caps after system is

to energize
or

User

caps
1/12

system.

Interface

desired

Be sure set point is below indoor
and is set low enough to energize

ambient
desired

stage.

control

thermostat

For

(non-Infinity)
equipped

or User Interface

to ON or AUTO

15 minutes.
NOTE:

Check

mode,

system

25HNA6

Series

thermostat.

with a 15-minute

as desired.

refrigerant
only

Carrier
staging

using

Operate

timer. This timer

in low stage for 15 minutes,

unless

between

and thermostat

stage (after

and fan

control

or User Interface

to AUTO

appropriate
time delay(s).
Check refrigerant charge.

operates

O is powered

for

For Infinity
Light

on.

and Status
Control

Function

only,

Green

Lights
communications

(COMM)

A green LED (COMM
light) on the outdoor board (see Fig. 9)
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 not communication
is received
within 2 minutes, the LED will be turned OFF until the next valid
communication.
Status

Light

mode and fault codes as specified in the troubleshooting
See Table 5 for codes and definitions.

prevents

NOTE:

colored

Only

STATUS

light is used to display

one code will

are

control

board

the

Utility

Interface

there is at least a 5°F

of 2 minutes

adjust the set point at least 5°F below room
6. Set room thermostat

unit

be displayed

(the most recent,

the operation
section.

on the outdoor

with the highest

unit

priority).

at high stage until unit has been

temperature
a minimum

demand,

the next

in high-stage.

unit for

thermostats

difference

low-stage

upon

An amber

non-communicating

electronic

operating

room

power-up,

and fan

charge.

system

high

from operating

to COOL

two-stage

force

energized,

Amber

5. Set room

high-

of 5 minutes

Communication

disconnects

thermostat

if unit has not operated
a unit

and with second stage of cooling, Y1, Y2, and O are on. For
these systems, with first stage of heating Y1 is on and for second
stage of heating, Y1 and Y2 are on. When the reversing valve is

opened to refrigerant
flow (back seated). Replace
finger-tight
and tighten with wrench an additional
turn.
3. Close electrical

models,

or following

On 25HNA6
models
with non-communicating
(non-Infinity)
systems, with first stage of cooling, Y1 and O are powered on;

system

fully back

2. Unit is shipped with valve stem(s)
and caps installed.
Replace
stem

room

thermostat

that you do not vent

1. After system is evacuated,
and vapor service valves.

4. Set

On 25HNA6

12 hours,

minimum

regulations

these steps

past
may

refrigerant to the atmosphere.
repair or final unit disposal.
Follow

NOTE:

HAZARD

or ON,
Operate

set point. To
in low stage),

ambient.
to HEAT
as desired.
unit

for

or COOL
Wait for

15 minutes.

With Infinity

Control

The utility curtailment
relay
connections
on the control

should
board

be wired between R and Y2
for Infinity Communicating

Systems
only (see Fig. 9.) 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
When

Stage Change

compressor

Time

changes

Delay on 25HNA6

stages

from

high

high, there is a 1-minute
time delay before
The outdoor fan motor remains running.
('ompressor
When

Operation

the

compressor

on 25HNA6

Models

operates

high

stage

When

Time

•

compressor
The lower
refrigerant.

compressor

operates

low

stage

Five minute time delay to start cooling or heating
operation when there is a call from the thermostat

the

and upper
and both

operation,

include:

user interface. To bypass this feature, momentarily
short and release Forced Defrost pins.

refrigerant.
the

Delays

The unit time delays

restarts.

operation,

compressor
motor rotates clockwise.
Both the lower
pistons
are eccentric
with the rotating
crankshaft
compress

Models

to low or low to

•

Five minute
a brown-out

compressor
condition.

•

Two minute

time delay to return to standby

the

re-cycle

from last valid conmmnication

motor reverses direction (rotates counterclockwise).
piston becomes idle and the upper piston compresses
The start and run windings
ale reversed.

•

One minute
cooling

delay on return from

time delay of outdoor

mode when outdoor

operation

(with Infinity only).
fan at termination

ambient

is greater than or

equal to 100°F.
Crankcase

Heater

Operation
•

The crankcase
of outside

heater is energized

air temperature

during

Fifteen

unit off cycle regardless

(OAT) on 25HNA6

models.
•

The crankcase heater is energized
25HNA9 models.
Outdoor
The

Fan Motor

outdoor

unit

during off cycle below

energizes

outdoor

fan

Twenty

65°F on

any

time

compressor
is operating,
except for defrost. The ouMoor fan
remains energized
if a pressure
switch or compressor
overload

Thirty second
enabled.

•

On 25HNA6
between

of defrost before

is de-energized.

delay at termination

of defrost before

fan is energized.

•

compressor

models

staging

delay when quiet shift

there is a 1 minute

time delay

from low to high and from high to low

capacity.
On 25HNA9 models there is no delay; the
compressor
will change from low to high and from

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.
On 25HNA6
outdoor fan remains energized
during the 1-minute
staging time delay.

delay at termination

heat (Wl)

second

the outdoor

Operation
control

second

the auxiliary

high to low capacity

models, the
compressor

Compressor

Operation

on the fly to meet the demand.

on 25HNA9

Models:

When the compressor is operating
in low stage, the modulating
ring is de-activated,
allowing two internal bypass ports to close
off 33% of the scroll compression
area, so the system operates
part load capacity.
The 24volt solenoid coil is de-energized

at
in

low stage operation.
When

the compressor

is operating

in high stage, the modulating

ring is activated,
sealing the bypass ports, which allows the
compressor
to operate at full load capacity.
The 24volt solenoid
coil is energized
in high stage operation.
The
contains
a 230v to 24vac transformer
to supply
solenoid when it is energized.
The
compressor
should not be included in the system
power transformer sizing.

(furnace

25HNA9
unit
power to the
solenoid load

or fan coil) control

O
I PWM2

.u'_O

, fZII] 0

OO
O

0 0
©

sR[_ O

[] []

MODEl.

rlquid

* SUPPLIED

BY UTILITY

MODEL

EEIEEI

Lille

Solenoid

PROVIDER
A05247

Fig,
GENERAL

Control

INFORMATION

Low Ambient

Controned

low ambient

This unit is capable
when using Infinity

temperature.

This control
120 minutes,

cooling:

of low ambient cooling without a kit ONLY
control. A low ambient kit is not required,

up. Fan may not begin to cycle until about 40°F
cycle based on coil and outdoor air temperature.
low ambient

models,

•

mode operates

OAT.

Interface
AUTO
defrost

Fan will

as follows:

(the dip switches

by dip switches

•

When

•

off to allow refrigerant

defrost

for first 3 minutes

When

The

time 3-5 minutes,

board

the next defrost

time 5-7 minutes,

the next defrost

accumulates

the next defrost

compressor

compressor
running.
If LPS closes within 10 minutes
then cooling continues with the outdoor fan cycling per

The defrost

the coil temperature routine listed above for the remainder
of the cooling cycle. If the LPS does not close within 10

If the coil temperature
does not reach 32°F
the interval timer will be reset and start over.

then the normal

LPS trip response

and generate

(shut

time.

the

defrost demand. If a defrost demand exists, a defrost cycle will be
initiated at the end of the selected time interval. A defrost demand

during

exists when the coil temperature
minutes during the interval.

operation

run

accumulated
run time approaches
the selected defrost interval
time, the control board monitors the coil temperature
sensor for a

low ambient start up. After 3 minutes, ifLPS trips, then
outdoor fan motor is turned off for 10 minutes, with the

minutes,

on the last

minutes.

When defrost time >7 minutes,
interval=30
minutes.

control

time based

minutes.

defrost

interval=60

system to

Fan is ON when outdoor
coil temp > (outdoor
air
temperature
+ 25°F) or outdoor coil temp > 80°F or if

interval

When defrost time <3 minutes,
interval= 120 minutes.

minutes. (Fan is turned
stabilize.)

cooling

on the

are not used.)

defrost adjusts the defrost
time as follows:

•

switch is ignored

30. 60, 90,

On 25HNA9
, the defrost interval times: 30, 60, 90, and 120 minutes
or AUTO
are selected by the Infinity
Control
User

Fan is OFF when outdoor coil temp is < (outdoor air
temperature
+ 3 °F) or outdoor fan has been ON for 30

Low pressure

times:

settings.

outdoor fan has been OFF for 30 minutes. (Fan is turned
on to allow refrigerant system to stabilize.)
•

interval

these are selected

interval=90
•

defrost

unit control board or by the Infinity Control User Interface.
The
Infinity Control selection overrides the control board dip switch

provides an automatic evaporator coil freeze protection algorithm
that eliminates the the need for an evaporator
freeze thermostat.
Low ambient cooling must be enabled in the User Interface set

cnntrolled

offers 5 possible
or AUTO.

On 25HNA6

and the outdoor
fan motor does not need to be replaced
for
Infinity controlled
low ambient operation.
The Infinity Control

Infinity

Board

Defrost

Cooling

When this unit is operating
below 55°F outdoor
provisions must be made for low ambient operation.
Infinity

9 - 2-Stage

65°F

down

•

LPS trip error) will occur.

cycle is terminated

or 10 minutes

Upon

32°F

when the coil temperature

for 4
reaches

has passed.

initial power

within

up the first defrost

defaulted to 30 minutes.
selected times.
•

is at or below

Defrost

is only allowed

ambient

temperature.

Remaining

the interval,

interval
intervals

to occur below 50°F

is
are at
outdoor

Defrost

Hold

STEP

On 25HNA6

models,

in a non-comnaunicating

system,

thermostat
becomes
satisfied
(Y1 or Y1 and Y2)
defrost cycle is terminated,
the control will "Hold"
mode and finish
On 25HNA6
all 25HNA9

the defrost

the User Interface
down the system.

2-pin header
control board

and 25HNA9
with communicating
(Infinity)
defrost is initiated with the User Interface.

On all models,

during

•

a Forced

If coil temperature
and outdoor

air temperature

defrost sequence
•

If coil temperature

or outdoor

of 32°K
a full

do not

an abbreviated

30 second

Accesso D,
Control:
solenoid
solenoid

Liquid
When

Models

See

with
Infinity
Communicating
Infinity
control,
the liquid
line

solenoid
refrigerant

with Accessory
Thermostat:
and C terminal

Only Procedure
requires

Liquid

Solenoid

The liquid
connections.

charging by the subcooling
operate

unit

a minimum

method.
of 10 minutes

high stage before checking charge.
On 25HNA6
models, charging in low

stage

compressor

damage

chattering

and

possible

may cause
to

the

Using

liquid

service

gage to service

valve

pressure

attaching

port.

subcooling
high
stage

temperature
is higher than indicated or reclaim refrigerant
if temperature
is lower. Allow a tolerance of _+3°F.

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.

Non-Communicating
connect
to the Y1

plate,

6. To obtain required
subcooling
temperature
at a specific
liquid
line pressure,
add refrigerant
if liquid
line

output is provided
at the Y1 connection.
Connect the
as shown in the wiring label diagram. This is a 24vac

On 25HNA6

rating

pressure.

Accessory

Solenoid
using the

unit

operation.

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
of flow control.
details.

are not favorable.

5. Refer to Table 3. Find the point where required subcooling
temperature
intersects
measured
liquid
service
valve

mode.

facing the outdoor unit. This is the direction
application manual for long-line
application

with

4. Refer
to unit
rating
plate for required
temperature.
Subcooling
amount
is for

sequence of operation will occur. Reversing valve
and compressor
will turn off for 30 seconds, then

Line Solenoid

conditions

in accordance

3. Measure liquid line temperature
by attaching an accurate
thermistor
type or electronic
thermometer
to liquid line
near outdoor coil.

turn back on to complete defrost. At the end of the defrost cycle.
the reversing
valve de-energizes,
compressor
will turn off for
another 30 seconds, and the fan will turn off for 40 seconds,

Liquid

charging

in
in

unit plate.

accurate

selecting
the 3rd position
of the 3-position
dip switch.
For
25HNA6
and 25HNA9
models with communicating
(Infinity)
systems, it must be enabled at the User Interface. When activated,

in the heating

unit

the charging chart on the outdoor

2. Measure

cycle and restarting
of the heating cycle.
On 25HNA6 models
with non-communicating
system, this feature must be enabled by

starting

compressor.

Shift

before

shown

line above or below
15 ft..
fall within the ranges given on

Cooling

Quiet Shift is a field selectable defrost mode which may eliminate
occasional
noise that could be heard at the start of the defrost

the following
will energize

be weighed

1. On all unites,

air temperature

are

To calculate additional charge required for a 25-ft. line set:
25 ft. - 15 ft. = 10 ft. X 0.6 oz./ft. = 6 oz. of additional charge.

will occur.

meet the above requirements,
defrost will occur.
Quiet

is below 50°K

method

_+0.6 oz./ft, of 3/8-in.
liquid
respectively. Favorable conditions

This system
temperature

charging

EXAMPLE:

Defrost:

is at defrost

and

If subcooling

charge must

(see Fig 9) on the

On 25HNA6
control, forced

charge

NOTE:

will complete

with non-communicating
(non-Infinity)
can be initiated by manually shorting the

labeled FORCED
DEFROST
for 5 seconds then releasing.

Charge

information plate. Charge Puron refrigerant units with cylinder
inverted position
and a commercial-type
metering
device
manifold hose. Charge refrigerant into suction line.

Defrost

On 25HNA6
models
control, forced defrost

Factory

cycle on the next call for heat.

because
shutting

15 --Check

Unit Charge

before the
in defrost

models, with communicating
Infinity Control and
models,
defrost
hold
is not needed
in a

communicating
system
the defrost cycle before
Forced

if the

solenoid
is
The liquid

closes,
in the compressor
off mode.
to prevent
migration into the unit through the liquid line.

Heating

Check

Chart

To check system

Procedure

operation

is necessary

during

cycle,

refer to the Heat

charge

must

be weighed

in accordance

with

label on outdoor
relationship
exists

unit. This chart
between
system

_+0.6

oz./ft,

liquid

during

Pump Charging
Instructions
indicates whether a correct

NOTE:
heating

In heating

mode,

pressures

are stable.

If in doubt,

correct refrigerant

check

refrigerant
remove

charge

3/8-in.

line

above

heating
unit
or

rating

below

season,
plate,
15

ft.,

EXAMPLE:
To calculate additional charge required for a 25-ft. line set:
25 ft. - 15 ft. = 10 ft. X 0.6 oz./ft. = 6 oz. of additional charge.

charge.

NOTE:

charging

respectively.

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

When

only when

and weigh

charge.
Table 3--Required

LiQUiD PRESSURE
AT SERVICE VALVE
(PSIG)

LiquidlLine

REQUIRED

Temperature

SUBCOOLING

(°F)

TEMPERATURE

(°F)

189

195

202

208

215

222

229

236

243

251

259

266

274

283

291

299

308

317

326

335

345

354

100

364

102

100

374

104

102

100

384

106

104

102

100

395

108

106

104

102

100

406

110

108

106

104

102

100

416

112

110

108

106

104

102

427

114

112

110

108

106

104

439

116

114

112

110

108

106

450

118

116

114

112

110

108

462

120

118

116

114

112

110

474

122

120

118

116

114

112

486

124

122

120

118

116

114

499

126

124

122

120

118

116

511

128

126

124

122

120

118

MAJOR
2-Stage

Control

Systems

Board

The HP control

TROUBLESHOOTING

COMPONENTS

board controls

•

High

•

Outdoor

•

Reversing

•

Defrost

•

Low ambient

•

Crankcase

•

Compressor

•

Pressure

•

Time Delays

•

On 25HNA6

the following

and low stage compressor

functions:

contactor

If communication

operation

valve operation

The control

heater operation
external

Pressure

protection

The

switch monitoring

models,

board

outdoor

only)

On 25HNA6
models
with
communicating
system
25HNA9 models, use the ABCD Infinity Connections.

contains

Compressor

Relief

motor
Refer

windings
to Table

is protected by an internal pressure
discharge
gas into the compressor

The compressor
is also protected
to motor windings.

Compressor

Control

and

fan operating

the appropriate
a 15 minute

all

call for cooling

7. In

correct

the

for 15 minutes

delay,

if there

is a call for cooling
reset,

the

appropriate

or heating.

event

high-pressure

lockout,

check

8. In the event of a low-pressure
lockout, check the refrigerant

relief (IPR)
shell when

(cooling)
heating.

by an internal overload

Control

the

the appropriate
be replaced.

board

and outdoor

cycles,

the

switch

trip

refrigerant

unit

charge,

coil (in cooling)
in heating.

for

switch trip or low-pressure
charge and indoor airflow

fan operation

and outdoor

coil in

Fault

If the outdoor

Contactors
control

contactor

fault code (see Table 5)

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

pressure
exceeds
psi on 25HNA9

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

or low

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

that provide
4 for

If a

low-pressure

of a high

compressor

outdoor fan operation,
and outdoor
airflow restrictions, or indoor airflow

differential
between
suction
and discharge
500-550
psi on 25HNA6 models and 550-625
models.
attached

high-

heating
and LPS or HPS
is
compressor
contactor is energized.

Compressor

operation.

with

the appropriate

2. Keep the outdoor

connections
located at the bottom of the control board (see Fig.
9.) On a non-communicating
system, output W1 is connected
at
the bottom of the control board for auxiliary heat.

2-pole
(3500 RPM)
winding resistance.

plug to operate.

not operate and the
shown in Table 5.

Protection

1. De-energize

4. After

The compressor
which relieves

must have a valid model

unit is equipped

On 25HNA6
models
with non-communicating
(non-Infinity)
System,
the two-stage
control
receives
24vac
low-voltage
control
system
inputs
through
the R, C, Y1, Y2 and O

Internal

control is lost with the User

switches.
If the control senses the opening
pressure switch, it will respond as follows:

high and low stage start relay and
(Bristol

Switch

3. Display

The two stage compressor

the Infinity

valid model plug is not detected,
it will
control will flash the appropriate
fault code,

cooling

Field Connections

Two Stage

with

Model Plug

operation

Failure

Interface, the control will flash the appropriate fault code. (See
Table 5.) Check the wiring to the UI and the indoor and outdoor
units.

fan motor operation

capacitor

Communication

Brown-Out

unit control

board

has failed,

the control

fault code (see Table 5). The control

will flash

board

should

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 5).
230V Line

(Power

Disconnect)

Detection

If there is no 230v at the compressor
contactor(s)
when the indoor
unit is powered
and cooling
or heating
demand
exists, the
appropriate fault code is displayed. Verify the disconnect
and 230v wiring is connected
to the unit.
Compressor

Voltage

The

board

control

is dosed

Sensing
input

terminals

labeled

VS. VR

and L2 on

25HNA6 models and VS and L2 on 25HNA9 models (see Fig. 9)
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
and voltage
should
not be present
when
the
de-energized.

is energized.
contactor
is

Contactor
Shorted

Detection

If there is compressor

voltage

sensed when there is no demand

Troubleshooting
25HNA6
low & hiuh staues

for

Check

25HNA6

liquid pressure when switching
from low to high capacity.
Compressor
current should increase 100-250%
when switching
from low to high stage.

Compressor

Thermal

Cutout

Troubleshooting

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

cooling

heating,

the

appropriate

15 minutes.

minute

interval

If the thermal

check),

protector

closes,

the unit will resume

25HNA9

at the

units for proper

Check the suction pressures
at the
pressure should be reduced by 3-10%

service

switching

between

service valves.
when switching

Suction
from low

NOTE:

compressor

high

The liquid

pressures

stage operation,

are very

so liquid

similar

pressure

between

should

troubleshooting.
Compressor
from low

(at the next 15

current
to high

energized

operation.

should
stage.

increase
20-45%
The compressor

in high stage, should

measure

when switching
solenoid
when

24vac.

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.

Thermistors

are electronic

25HNA9

are used to sense outdoor air (OAT) and coil temperature
Refer to Fig. 12 for resistance values versus temperature.

If the control senses

Thermal

the temperature

Cutout

the compressor

voltage

then absent for 10 consecutive
seconds
demand
exists, the thermal protector

after start-up,

and is

If the outdoor

while cooling or heating
is open.
The control

the
has

every

15 minutes.

the next 15 minute
If the thermal

operation is locked
is displayed.
Low- or High
Compressor

interval

cutout

check),

out for 4 hours

Contactor

consecutive

(25HNA9

cycles,

and the appropriate

Open (25HNA6

voltage

protector

the unit will resume

trips for three

Contractor

If the compressor

If the thermal

models)

closes.

- Compressor

outdoor

fail. the control

air thermistor

insure
11.

thermistors

are mounted

will

in the

final

and coil thermistor
locations.

properly

Check

per Fig. 10 and Fig.

The control
temperature

continuously
monitors and compares the outdoor air
sensor and outdoor coil temperature
sensor to ensure

(at

operation.

proper operating

then unit

•

fault code

Comparison

conditions.

In cooling

The comparison

if the outdoor

air sensor

is:
indicates

>- 10_'F

warmer than the coil sensor (or) the outdoor air sensor
indicates >- 20°F cooler than the coil sensor, the sensors
are out of range.
In heating

the compressor

if the outdoor

air sensor

indicates

-> 35 °F

warmer than the coil sensor (or) the outdoor air sensor
indicates >- 10°F cooler than the coil sensor, the sensors
are out of range.
If the sensors
are out of range,
the control
appropriate fault code as shown in Table 5.

The thermistor
cooling
Failed

fault code.

comparison

or defrost
Thermistor

Factory
outdoor

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
stage starts, low stage operation
is locked

(OCT).

Sensor

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

The

mounted

/ No 230V at

Start Detection

should

Thermistors

Thermistor

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.
25HNA6 Models Only
Bristol Models Only

sense temperature.
decreases.

fault code. (See Table 5.)

be factory

•
when

which

the resistance

should

models)

is not sensed

devices

air or coil thermistor

IMPORTANT:

not re-set, the outdoor fan is turned off. If the call for cooling or
heating
continues,
the control
will energize
the compressor
contactor

increases,

flash the appropriate

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 5.
After 15
minutes, with a call for low or high stage cooling or heating,
compressor
contactor
is energized.
If the thermal protector

low and

not be used for

Temperature

Compressor

valves.

to high capacity.

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

pressures

low & hiuh staues

compressor
contactor for 15 minutes, but continues to operate the
outdoor fan. The control Status LED will flash the appropriate
code shown in table 5. After 15 minutes, with a call for low or
stage

and liquid

Suction pressure should be reduced by 5-10% when switching
from low to high capacity. There should be a 10-20% increase in

The control senses the compressor voltage at VR and VS. When
starting or running,
a phase difference
of the voltages
on the

high

suction

between

compressor
operation, the contactor may be stuck closed or there
may be a wiring error. The control will flash the appropriate
fault
code.
Models_

the

units for pl_oper switching

is not performed

will

during

flash

the

low ambient

operation.
Default

Operation

defaults have been provided in the event
air thermistor and/or coil thermistor.

of failure

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.

for 3 consecutive
low
out for 30 minutes. If

If the OCT sensor should fail, low ambient cooling will not be
allowed.
Defrost will occur at each time interval during heating

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.

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.
Count the number
of short and long flashes to determine
the
appropriate
flash code. Table 5 gives possible causes and actions
related to each error.

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 stub tube

Fig,

- Outdoor

Air Thermistor

Fig.

(OAT) Attachment

THERMISTOR
90

- Outdoor

Coil Thermistor

(OCT)

Attachment

CURVE

TEMPERATURE

100

120

(DEG. F)

A91431

Fig.

12 -

Resistance

Values Versus

Temperature

Table 4--Two-Stage
Compressor Resistances
(Winding Resistance at 70°F_+20 °)
Winding

Status

25HNA6024

25HNA6036

25HNA6048

25HNA6060

Start (S-C)

2.74

1.98

1.55

0.74

Run (R-C)

0.80

0.75

0.48

0.36

Winding

25HNA9024

25HNAg036

25HNA9048

25HNAg060

Start (S-C)

1.40

1.29

1.52

0.60

Run (R-C)

1.32

0.89

0.64

0.49

(:odes

Table 5 shows the status codes flashed by the amber
flashed by the amber status light on the control board.
The codes

are flashed

by a series of short

status

and long flashes

light.

Most

of the status

system

light.

problems

can be diagnosed

The short flashes

indicate

by reading

the first digit

the status

code as

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 is 1.0 second
ON. Time between flashes is 0.25 seconds.
Time between short flash and first long flash is 1.0 second. Time between code repeating is 2.5
seconds with LED OFF.
EXAMPLE:
3 short flashes followed

by 2 long flashes indicates

a 32 code.

Table 5 shows
16

this to be low pressure

switch open.

Table 5--TROUBLESHOOTING

OPERATION

Standby
tion

no call for unit opera-

Emergency

Mode

Modet 25HNA9

only
Low Stage Cool/Heat Operation
High Stage Coot/Heat Operation

AMBER
LED
FLASH
CODE

FAULT

None

On solid,
no flash

Standard Thermostat Control
(25HNA9only)

Rapid, continuous flashing

POSSIBLE CAUSE AND ACTION

Normal operation
Unit being controlled by standard thermostat inputs instead of tnfinity Control. Only high stage operation is available. This operatimg mode should be
used in emergency situations only.

None

1, pause

Normal operation

None

2, pause

Normal operation

System Communications Failure

Communication with user interface lost. Check wiring to UI, indoor
and outdoor units

Invalid Model
Plug

Control does not detect a modeI ptug or detects an invalid model
plug. Unit wili not operate without correct model plug.

High Pressure
Switch Open

High-pressure
switch trip. Check refrigerant charge, outdoor fan
operation and coils for airflow restrictions.

Low Pressure
Switch Open

Control Fault

Low pressure switch trip. Check refrigerant charge and indoor air
flow
Outdoor unit control board has failed. Control board needs to be

Brown Out (230
v)

No 230v at Unit

Outdoor Air

replaced.
Line voltage < 187v for at least 4 seconds. Compressor and fan
operation not allowed until voItage>190v.
Verify line 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.

Temp Sensor
Fault

Outdoor air sensor not reading or out of range. Ohm out sensor
and check wiring.

Outdoor Coil
Sensor Fault

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

Thermistors
of range

Improper relationship between colt sensor and outdoor air sensor.
Ohm out sensors and check wiring.
No voltage phase difference is detected (on 25HNA6 models) or

Low Stage Thermal Cutout

compressor voltage sensed, then disappears (on 25HNA9 models)
while cooling or heating demand exists. Possible causes are internal compressor overload trip or start relay not releasing (if installed).
No voltage phase difference is detected (on 25HNA6 models) or

High Stage Thermal Cutout

Contactor
Shorted

No 230V at
Compressor
(25HNA9 Only)

Low Stage Did
Not Start
(25HNA6 Only)

out

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

Low Stage Did
Not Start 3 times
(25HNA6OnIy)

High Stage Did
Not Start
(25HNA6 Only)

after 1 second.

For 3 consecutive low stage starts, the specified start voltage at VR
terminal was not achieved & start relay was de-energized.
Low
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.

High Stage Did
Not Start 3 times
(25HNA6 Only)

For 3 consecutive high stage starts, the specified start voltage at VS
terminal was not achieved & start relay was de-energized.
High
stage locked out for 30 minutes.

Low Stage Thermal Lockout

Thermal cutout occurs in three consecutive low/high stage cycles.
Low stage locked out for 4 hours or untiI 24v power recycled.

High Stage Thermal Lockout

Thermal cutout occurs in three consecutive high/low stage cycles.
High stage locked out for 4 hours or until 24v power recycled.

Low Pressure
Lockout

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

High Pressure
Lockout
Low Contactor
Open
(25HNA6 Only)
High Contactor
Open
(25HNA6 Only)

High pressure switch trip has 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.

INDOOR

CONTROL

FAN COIL

2-SPEED
HEAT PUMP
HybridHeat
THERMOSTAT

RVS

COOLING

HEAT/COOL
STAGE
HEAT

STAGE

I-q-Q

RVS COOLING

.... -4_}-.5.--_MO_
----1 D_'JUMPERFOR

HEAT/COOL
STAGE

24 VAC

....
....

FAN

E]_

HOT

--HEAT

HEAT/COOL
STAGE 1
(COMPRESSOR I O}

_REMOVE

24VAC

COMM

HUMIDIFY

[
RVS

HEATING

24 VAC

J] FOR

HOT

24 VAC COMM

(24 MAC)

N/A

]

RVS SENSING

UOM

HUM

I-

OUTDOOR
I-r_.

OUTDOOR
SENSOR

GON"EOT'O"
LF_

SENSOR
___OUTDOOR___

SENSOR

FF@_q I

__&_IHUM'D'F'ER
I___J

r_,

',
I-

I_LI-

_ _ _ 4_R_l- I_ _ _

DEHUMIDIFY
MODES

....

_uI

FAN

....

- -

t]-L4_]

HEAT/COOL
STAGE 2
(COMPRESSOR HI}

I_ _[_]

RNACE/3
HEAT (F STAGE

L-.E}.
DEHUMIDIFY

r_
i

STAGING

TWO-STAGE
HEATRUMP

TWO-STAGE
FURNACE

OONNEOTIONL_Lt_J"
A02005

Fig, 13

- Infinity

Wiring

Heat Pump
(applies

with 2-Stage

Puron

A06157

refrigerant

Fi 9, 14

(non-communicating)

to 25HNA6

Models

User

Furnace

- HybridHeat
and Two-Stage

Thermostat

Heat Pump

with Two-Stage
(non-communicating)

Only)

Interface

Fan

Coil

Communicating

AC//HP

::D
i

Fig

9 - FE4A

Fan

Coil Wiring

with

2-Speed

AC/HP
A03076

Fig,

15 - Infinity

Furnace

el" Fan

(:oil Wiring

with Communicating

Two-Stage

AC / HP

FINALCHECKS
IMPORTANT:
Before
leaving
job,besure
todothefollowing:
1.Ensure
thatallwiringis routed
awayfromtubingand
sheetmetaledgesto prevent
rub-through
or wire
pinching.
2.Ensure
thatallwiringandtubingissecure
inunitbefore
adding
panels
andcovers.
Securely
fasten
allpanels
and
covers.
3.Tighten
service
valvestem
caps
to1/12-turn
pastfinger
tight.
4.LeaveUsersManualwith owner.Explainsystem
operation
andperiodic
maintenance
requirements
outlined
inmanual.
5.FilloutDealer
Installation
Checklist
andplace
in
customer
file.

CARE
ANDMAINTENANCE
Forcontinuing
highperformance
andto minimize
possible
equipment
failure,
periodic
maintenance
mustbeperformed
on
thisequipment.
Frequency
ofmaintenance
mayvarydepending
upongeographic
areas,
suchascoastal
applications.
SeeOwner's
Manual
for
information.

PURON®
(R-410A)
REFRIGERANT
QUICK
• Puron

refrigerant

components
• Puron

refrigerant

• Recovery
• Puron

operates

cylinder

service

pressure
should

pumps

pressure

be designed

• Do not use liquid-line

• If indoor

• When

to certain

unit is equipped

all warnings,

hose

retard.

with POE oils.

from oil.
pressures

less than 600 psig.

than 72 hours.

oil to atmosphere.

plastics and roofing

materials.

with wet cloth when brazing.

filter drier is required

with an R-22

on every unit.

while

for service,

TXV or piston metering
it is under
recover

device,

it must be changed

evacuate

then break vacuum

into the atmosphere.

tube coils.
cautions,

to a hard shutoff

Puron TXV.

a vacuum.
refrigerant,

prior to recharging.

refrigerant

• Do not use capillary
• Observe

valves

to atmosphere

to 500 microns

• Do not vent Puron

device in the manifold

TXV.

system must be opened

Evacuate

type metering

filter drier in liquid line.

liquid-line

• Never open system

is only compatible

moisture

• Wrap all filter driers and service
approved

or DOT BW400.

Use a commercial

rating.

rapidly. Do not expose

• POE oils may cause damage

• Do NOT use an R-22

and replacement

operating

line filter driers in line longer

• Do not install a suction-line

• A factory

with liquid refrigerant.

filter driers with rated working
suction

• POE oils absorb moisture

equipment

to detect HFC refrigerant.

as with other HFCs.
will not remove

• Do not leave Puron

Be sure that servicing

be 700 psig high side and 180 psig low side with 550 psig low-side

should

refrigerant,

• Vacuum

than R-22.

rating must be 400 psig, DOT 4BA400
be charged

• Use hoses with 700 psig service

• Puron

pressures

refrigerant

into suction line with compressor

sets should

• Leak detectors

higher

with Puron

GUIDE

are rose colored.

systems

when charging

percent

to operate

cylinders

refrigerant

• Manifold

at 50-70

are designed

REFERENCE

and bold text.

• All indoor coils must be installed with a hard shutoff

Puron TXV metering

device.

with dry nitrogen

and replace filter driers.

Mannfae_urer

2006

6;a11_er

rese_'es

Colp

•

the

tlght

7310

Mo1_is

to change,

St •

any

Indianapolis,

time.

speeifieations

46231

and

P1_i_ted

designs

without

notice

and

in USA

wit hou_

Catalo_
obligations.

No: 25HNA-2SI

Replaces:25HNA

ISI

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CARRIER Air Conditioner/heat Pump(outside Unit) Manual L0604185

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