Carrier 24ANB748A0031030, 24ANB736A0030030, 24ANB736A0031030, 24ANB748A0030030 Installation Guide
Installation Instructions
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency nmst 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/_k
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury. Understand
these signal words; DANGER, WARNING, and CAUTION. These
words are used with the safety-alert symbol. DANGER identifies
the most serious hazards which will result in severe personal injury
or death. WARNING signifies hazards which could result in
personal injury or death. CAUTION is used to identify unsafe
practices which would result in nfinor personal injury or product
and property damage. NOTE is used to highlight suggestions
which will result in enhanced installation, reliability, or operation.
ELECTRICALSHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch nmst be in the OFF position and
install a lockout tag. There may be more than 1 disconnect
switch. Lock out and tag switch with a suitable warning label.
Indoor Thermostat Control Options
Model Infinity®
24AN B7/24AN B1 Yes Yes
Control 2-stage
Standard
Thermostat
INSTALLATION RECOMMENDATIONS
NOTE: In some cases noise in the living area has been traced to
gas pulsations from improper installation of equipment.
1. Locate unit away from windows, patios, decks, etc. where
unit operation sound may disturb customer.
2. Ensure that vapor and liquid tube diameters are appropriate
for unit capacity.
3. Run refrigerant tubes as directly as possible by avoiding un-
necessary turns and bends.
4. Leave some slack between structure and unit to absorb vi-
bration.
5. When passing refrigerant tubes through the wall, seal open-
ing 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 sur-
rounds vapor tube.
9. When necessary, use hanger straps which are 1 in. (25.4
ram) 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.
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,
NOTE:Avoid contact between tubing and structure
UTDOORWAL __ ,NDOO WALL7
L,QU,DTUBE
o•
THROUGH THE WALL
J_r,,,,,,,,,_J 01ST
(AROUN_STRAP'_'_,N_poLA_B E
h
1" (25.4 mm) MIN. _l I_ _ LIQUID TUBE
SUSPENSION
Fig. 1 - Piping Installation
The outdoor unit contains system refrigerant charge for operation
with AHRI 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.
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.
INSTALLATION
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.
This unit employs one louver spacer on each of the four sides to
prevent louver movement during operation. The louver spacers are
trapped between the coil surface and louver at the approximate
center of each side (See Fig. 2). This louver spacer should be
present and, if dislodged during shipment, must be reinstalled
before unit is placed into operation.
d
A94026
Install on a Solid, Level Mounting Pad
If conditions or local codes require the unit be attached to pad, tie
down bolts should be used and fastened through knockouts
provided in unit base pan. Refer to unit mounting pattern in Fig. 3
to determine base pan size and knockout hole location.
For hurricane tie downs, contact local distributor for details and PE
(Professional Engineer) certification, if required by local
authorities.
On rooftop applications, mount on level platform or frame. Place
unit above a load-bearing wall and isolate unit and tubing set from
structure. Arrange supporting members to adequately support unit
and minimize transmission of vibration to building. Consult local
codes governing rooftop applications.
Roof mounted units exposed to winds may require wind baffles.
Consult the Application Guideline and Service Manual -
Residential Split System Air Conditioners and Heat Pumps for
wind baffle construction.
NOTE: Unit must be level to within -+2° (-+3/8 in./ft,-+9.5 mm/m.)
per compressor manufacturer specifications.
3/8-in. (9.53 mm) Dia.
Tiedown Knockouts in
Basepan(2) Places
View From Top
UNIT BASE PAN TIEDOWN KNOCKOUT LOCATIONSin. (mm)
Dimensionin. (mm) A B C
31-1/2 X 31-1/2
(800X 800) 9-1/8 (231.8) 6-9/16 (166.7) 24-11/16 (627.1)
35 X 35
(889 X 889) 9-1/8 (231.8) 6-9/16 (166.7) 28-7/16 (722.3)
A05177
Fig. 3 - Tiedown Knockout Locations
Clearance Requirements
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 24 in. (609.6 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.
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 in the Infinity
Control, and the maximum outdoor operating ambient in cooling
mode is 125°F (51.67°C). At line voltage of 208v (or below, and
outdoor ambient of 120°F (48.9°C) (and above), the compressor
operates in low stage. On Infinity communicating systems, low
ambient cooling operation is possible at ambient as low as 0°F
(-17.78°C).
Fig. 2 - Louver Spacer Location
Al1380a
Table 1 - Accessory Usage
REQUIRED FOR
ACCESSORY APPLICATIONS
Compressor Start Assist Kit No Yes No
Crankcase Heater No
Evaporator Freeze Protection Standard with Infinity Control No No
Liquid-Line Solenoid Valve No No No
Low-Ambient Control Standard with Infinity Control No No
Puron Refrigerant Balance Port Hard-
For tubing set lengths between 80 and 200 ft. (24.38 and 60.96 m) horizontal or 35 ft. (10.7 m) vertical differential (total equivalent length), refer to the Long
Line Guideline--Air Conditioners and Heat Pumps using Puron® Refrigerant.
1- Required on all indoor units. Standard on all new Puron refrigerant fan coils and furnace coils.
ShutOff TXV Yes1" Yest Yes1"
Support Feet Recommended No Recommended
Winter Start Control Standard with Infinity Control No No
LOW-AMBIENT COOLING REQUIRED FOR LONG LINE
APPLICATIONS APPLICATIONS*
(Below 55°F/12.8°C) (Within 2 miles/3.22 km)
Yes Yes
(standard on some units) (standard on some units)
REQUIRED FOR SEA COAST
Make Piping Connections
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could result in personal injury
or death.
Relieve pressure and recover all refrigerant before system
repair or final unit disposal. Use all service ports and open
all flow-control devices, including solenoid valves.
Federal regulations require that you do not vent refrigerant
to the atmosphere. Recover during system repair or final
unit disposal.
[]NIT 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
ram) vertical rise at service valve. Refrigerant tubing lengths
up to 36-in (914.4 ram) may be buried without further
special consideration. Do not bury lines more than 36-in.
(914.4 ram).
Outdoor units may be connected to indoor section using accessory
tubing package or field-supplied refrigerant grade tubing of correct
size and condition. Rated tubing diameters shown in Table 2 are
recommended up to 80 ft. (24.38 m). See Product Data for
acceptable alternate vapor diameters and associated capacity losses.
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 2 for field tubing
diameters. Refer to Table 1 for accessory requirements.
There are no buried-line applications greater than 36-in. (914.4
ram) allowed.
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 AHRI rated indoor unit when
connected by 15 ft. (4.57 m) of field-supplied or factory-accessory
tubing, and factory supplied filter drier. Check refrigerant charge
for n_axinmm efficiency.
NOTE: If the indoor furnace coil width is more than the furnace
casing width, refer to the indoor coil Installation Instructions for
transition requirements.
[]NIT OPERATION AND SAFETY HAZARD
Failure to follow this warning could result in personal injury
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® refrigerant equipment.
Refrigerant Tubing Connection Outdoor
Connect vapor and liquid tubes to fittings on vapor and liquid
service valves (see Table 2.) Use refrigerant grade tubing.
Sweat Connection
[]NIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Service valves must be wrapped in a heat-sinking material
such as a wet cloth while brazing.
Use refrigeration 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.
Table 2 - Refrigerant Connections and Recommended Liquid
and Vapor 1hbe Diameters (In.)
LIQUID
UNIT SIZE
724
124
736,136
748,148
760,160
Units are rated with 25 ft. (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 35 ft. (10.7 m) vertical differential 250 ft. (76.2 m) Total
Equivalent Length), refer to the Residential Piping and Longline Guide
line- Air Conditioners and Heat Pumps using Puron refrigerant.
Connection
&Max. Tube
Diameter
3/8
3/8
3/8
3/8
3/8
RATED VAPOR*
Connection Tube
Diameter Diameter
3/4 3/4
7/8 7/8
7/8 7/8
7/8 1-1/8
7/8 1-1/8
3.Foralternateliquidlineoptionson18-42sizeunitsseeProductDataor
ResidentialPipingandApplicationGuideline
Install Liquid-Line Filter Drier Indoor
[]NIT DAMAGE HAZARD
Failure to follow this caution may result m equipment
damage or improper operation.
1. Installation of filter drier in liquid line is required.
2. Filter drier nmst be wrapped in a heat-sinking material
such as a wet cloth while brazing.
Refer to Fig. 4 and install filter drier as follows:
1. Braze 5-in. liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to above 5-in. (127 ram) liquid tube,
Flow arrow must point towards indoor coil.
4. Connect and braze liquid refrigerant tube to the filter drier.
A05178
Fig. 4 - Liquid Line Filter Drier
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.
Refrigerant tubes and indoor coil should be evacuated using the
recommended deep vacuum method of 500 nficrons. The alternate
triple evacuation method may be used (see triple evacuation
procedure in service manual). 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 nficrons 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. A tight dry system will hold a vacuum of 1000
nficrons after approximately 7 nfinutes. See Fig. 5.
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
0 1 2 3 4 5 6 7
MINUTES
A95424
Fig. 5 - Deep Vacuum Graph
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 or wires. Pay
close attention to feeder tubes, making sure wire ties on feeder
tubes are secure and tight.
Make Electrical Connections
Be sure field wiring complies with local and national fire, safety,
and electrical codes, and voltage to system is within linfits 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
pernfissible linfits.
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.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal iniury or
death.
The unit cabinet must have an uninterrupted or unbroken
ground to nfininfize 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.
Connect Ground and Power Wires
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 6.
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
FIELD POWER ]
WIRING
FIELD GROUND
WIRING J
Fig. 6 - Line Connections
GROUND
LUG
CONTACTOR
A91056
Connect Control Wiring
This unit is capable of communication with an Infinity Control, or
will operate using standard 24v 2-stage thermostat. Route 24-v
control wires through control wiring grommet and connect leads to
control board. When an Infinity User Interface is available,
connect to A and B connections only. If additional grounding is
needed, use C terminal. If a 2-stage thermostat is used, connect to
the R, C, Y1, and Y2 connections. Refer to the wiring label to
further clarification.
Use No. 18 AWG color-coded, insulated (35 °C minimum) wire. If
thermostat is located more than 100 ft. (30.48 m) from unit, as
measured along the control voltage wires, use No. 16 AWG
color-coded wire to avoid excessive voltage drop.
All wiring must be NEC Class 1 and must be separated from
incoming power leads.
Use furnace transformer, fan coil transformer, or accessory
transformer for control power, 24v/40va minimum.
NOTE: Use of available 24v accessories may exceed the
minimum 40va power requirement. Determine total transformer
loading and increase the transformer capacity or split the load with
an accessory transformer as required.
Final Wiring Check
IMPORTANT: Check factory wiring and field wire connections
to ensure terminations are secured properly. Check wire routing to
ensure wires are not in contact with tubing, sheet metal, etc.
Compressor Crankcase Heater
When equipped with a crankcase heater, furnish power to heater a
minimum of 24 hr before starting unit. To furnish power to heater
only, set thermostat to OFF and close electrical disconnect to
outdoor unit.
A crankcase heater is required if refrigerant tubing is longer than
80 ft. (24.38 m). Refer to the Application Guideline and Service
Manual Longline Section-Residential Split-System Air
Conditioners and Heat Pumps.
Airflow Setup for Infinity Control Furnace or FE
Fan Coil (communicating)
When using an Infinity User Interface, airflow is automatically
selected based on equipment size. See User Interface Installation
Instructions and air conditioner Product Data for available
adjustments.
Airflow Selections (ECM Furnaces - non commu-
nicating)
The ECM Furnaces provide blower operation to match the
capacities of the compressor during high and low stage cooling
operation. Tap selections on the furnace control board enable the
installing technician to select the proper airflows for each stage of
cooling. Below is a brief summary of the furnace airflow
configurations
1. The Y2 call for high stage cooling energizes the "Cool" tap
on the control board. The grey wire from cool tap is connec-
ted to tap 5 on the motor. Refer to the furnace Product Data
to find the corresponding airflow. If the airflow setting for
high cooling needs to be switched from tap 5 to a different
tap, jumper a connection from the cool tap to the desired tap
so that the Y2 signal is communicated via the cool tap to the
desired speed tap.
2. The Y1 call for low stage cooling energizes the "Fan" tap
on the control board. The red wire from the fan tap is con-
nected to tap 1 on the motor. Refer to the furnace Product
Data to find the corresponding airflow. If the airflow setting
for low cooling needs to be switched from tap 1 to a differ-
ent tap, jumper a connection from the Fan tap to the desired
tap so that the Y1 signal is communicated via the Fan tap to
the desired speed tap. The Y1 setting will also govern the
continuous fan airflow for the furnace.
Refer to the literature for the furnace and air conditioner Product
Data for further details,
Airflow Selection for Variable Speed Furnaces
(non-communicating)
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:
1. 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 re-
quired airflow shown in the air conditioning Product Data
for HIGH speed.
2. 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 re-
quired airflow shown in the air conditioning Product Data
for LOW speed. If a higher 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 Installa-
tion Instructions for details of how to use this feature.
Airflow Selection for FV4C Fan Coils (non-com-
municating)
The FV4 provides high- and low-stage blower operation to match
the capacities of the compressor at high- and low-stage.
To select recommended airflow, refer to the FV4C Installation
Instructions. The FV4C utilizes an Easy Select control board that
allows the installing technician to select proper airflows. This fan
coil has an adjustable blower-off delay factory set at 90 sec. for
high- and low-stage blower operation.
When using a communicating control with the fan coil or the
furnace, dip-switch adjustments are not necessary. The outdoor
unit configuration and the indoor airflows are determined by
communicating control setup.
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