Carrier 24ABR318A0030010 User Manual A/C UNIT Manuals And Guides L0610772

CARRIER Air conditioner/heat pump(outside unit) Manual L0610772 CARRIER Air conditioner/heat pump(outside unit) Owner's Manual, CARRIER Air conditioner/heat pump(outside unit) installation guides

User Manual: Carrier 24ABR318A0030010 24ABR318A0030010 CARRIER A/C UNIT - Manuals and Guides View the owners manual for your CARRIER A/C UNIT #24ABR318A0030010. Home:Heating & Cooling Parts:Carrier Parts:Carrier A/C UNIT Manual

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Installation Instructions
Fig, 1 - 24ABR*
*Shown with dense coil guard option
A05341
NOTE: Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS ....................... 2
INSTALLATION RECOMMENDATIONS ............. 2
INSTALLATION .............................. 3 - 10
Step 1 - Check Equipment & Jobsite ............... 3
Step 2 - Install on Solid Pad ...................... 3
Step 3 - Clearance Requirements .................. 3
Step 4 - Operating Ambient ...................... 3
Step 5 - Install TXV ......................... 3 - 4
Step 6 - Make Piping Connections .............. 4 - 7
Step 7 - Make Electrical Connections ............ 7 - 8
Step 8 - Compressor Crankcase Heater ............. 8
Step 9- Install Electrical Accessories .............. 8
Step 10 - Start-Up ........................... 8 - 9
Step 11 - Check Charge ......................... 10
Step 12 - Final Checks .......................... 10
CARE AND MAINTENANCE ...................... 10
SAFETYCONSIDERATIONS
Improperinstallation,adjustment,alteration,service,
maintenance,orusecancauseexplosion,fire.electricalshock,or
otherconditionswhichmaycausedeath,personalinjury,or
propertydamage.Consultaqualifiedinstaller,serviceagency,or
yourdistributororbranchforinformationorassistance.The
qualifiedinstalleroragencymustusefactory-authorizedkitsor
accessorieswhenmodifyingthisproduct.Refertotheindividual
instructionspackagedwiththekitsoraccessorieswheninstalling.
Followallsafetycodes.Wearsafetyglasses,protectiveclothing,
andworkgloves.Usequenchingclothforbrazingoperations.
Havefire extinguisheravailable.Readtheseinstructions
thoroughlyandfollowallwarningsor cautionsincludedin
literatureandattachedtotheunit.Consultlocalbuildingcodes
andNationalElectricalCode(NEC)forspecialrequirements.
Recognizesafetyinformation.Thisisthesafety-alertsymbolZ_S
Whenyouseethissymbolontheunitandininstructionsor
manuals,bealerttothepotentialforpersonalinjury.Understand
thesesignalwords;DANGER.WARNING,andCAUTION.
Thesewordsareusedwiththesafety-alertsymbol.DANGER
identifiesthemostserioushazardswhichwillresultin severe
personalinjuryordeath.WARNINGsignifieshazardswhich
couldresultinpersonalinjuryordeath.CAUTIONisusedto
identifyunsafepracticeswhichwouldresultinminorpersonal
injuryor productandpropertydamage.NOTEis usedto
highlightsuggestionswhichwillresultinenhancedinstallation,
reliability,oroperation.
ELECTRICALSHOCKHAZARD
Failuretofollowthiswarningcouldresultinpersonal
injuryordeath.
Beforeinstalling,modifying,orservicingsystem,main
electricaldisconnectswitchmustbein theOFF
position.Theremaybemorethan1disconnectswitch.
Lockoutandtagswitchwithasuitablewarninglabel.
INSTALLATIONRECOMMENDATIONS
NOTE:Insomecasesnoiseinthelivingareahasbeentracedto
gaspulsationsfromimproperinstallationofequipment.
1.Locateunitawayfromwindows,patios,decks,etc.where
unitoperationsoundmaydisturbcustomer.
2.Ensurethatvaporandliquidtubediametersare
appropriateforunitcapacity.
3.Runrefrigeranttubesasdirectlyaspossiblebyavoiding
unnecessaryturnsandbends.
4.Leavesomeslackbetweenstructureandunittoabsorb
vibration.
5.Whenpassingrefrigeranttubesthroughthewall,seal
openingwithRTVorotherpliablesilicon-basedcaulk.
(SeeFig.2.)
6.Avoiddirecttubingcontactwithwaterpipes,ductwork,
floorjoists,wallstuds,floors,andwalls.
7.Donotsuspendrefrigeranttubingfromjoistsandstuds
witharigidwireorstrapwhichcomesindirectcontact
withtubing.(SeeFig.2.)
8.Ensurethattubinginsulationispliableandcompletely
surroundsvaportube.
9.Whennecessary,usehangerstrapswhichare1in.wide
andconformtoshapeoftubinginsulation.(SeeFig.2.)
10.Isolatehangerstrapsfrominsulationby usingmetal
sleevesbenttoconformtoshapeofinsulation.
NOTE: Avoid contact between tubing and structure
OUTDOORWALL-- ,NDOORWAL 7
SU LATION___ VAPOR TUBE
THROUGH THE WALL
_,..._JOIST
HANGER STRAP
(AROUND VAPOR
TUBE ONLY) _,/_ _ INSULATION
1" MIN. ---_1 I_-- L LIQUID TUBE
SUSPENSION
Fig, 2 - Piping Installation
A94026
Outdoor unit contains system refrigerant charge for operation
with ARI rated indoor unit when connected by 15 ft. 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
STEP 1 --Check Equipment and Job Site
UNPACK UNIT
Move to final location. Remove carton taking care not to damage
unit.
Inspect Equipment
File claim with shipping company prior to installation if shipment
is damaged or incomplete. Locate unit rating plate on unit corner
panel. It contains information needed to properly install unit.
Check rating plate to be sure unit matches job specifications.
STEP 2 --Install on a Solid, Level Mounting Pad
If conditions or local codes require the unit be attached to pad. tie
down bolts should be used and fastened through knockouts
provided in unit base pan. Refer to unit mounting pattern in Fig.
3 to determine base pan size and knockout hole location.
For hurricane tie downs, contact 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.) per
compressor manufacturer specifications.
STEP 3 --Clearance Requirements
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 30-in. clearance to
service end of unit and 48 in. above unit. For proper airflow, a
6-in. clearance on 1 side of unit and 12 in. on all remaining sides
must be maintained. Maintain a distance of 24 in. between units.
Position so water, snow, or ice from roof or eaves cannot fall
directly on unit.
3/8-in. Dia. Tiedown
STEP 4 --Operating Ambient
The minimum outdoor operating ambient in cooling mode is
55°F. and the maximum outdoor operating ambient in cooling
mode is 125°F.
STEP 5 --Install TXV
NOTE: Applies to non-TXV and Puron TXV indoor units
only. If installing a rated and approved indoor coil without a
factory installed R-22 TXV. remove and replace the fixed orifice
or Puron® TXV expansion device with an R-22 TXV.
The thermostatic expansion valve is specifically designed to
operate with R-22. Do not use a Puron® TXV. An existing
Puron® TXV must be replaced with a factory-approved TXV
specifically designed for R-22. Refer to Product Data Sheet for
the appropriate TXV kit number.
UNIT OPERATION HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
All indoor coil units must be installed with a hard shut
off R-22 TXV metering device.
IMPORTANT: If not factory installed, the TXV should be
mounted as close to the indoor coil as possible and in a vertical,
upright position. Avoid mounting the inlet tube vertically down.
Valve is more susceptible to malfunction due to debris if inlet
tube is facing down. A factory-approved filter drier must be
installed in the liquid line.
Installing TXV in Place of Piston
1. Pump system down to 2 psig and recover refrigerant.
2. Remove hex nut from piston body. Use backup wrench on
fan coils.
3. Remove and discard factory-installed piston. Be sure
Teflon seal is in place.
4. Reinstall hex nut. Finger tighten nut plus 1/2 turn.
NOTE: If the piston is not removed from the body, TXV will
not function properly.
0
View From Top
UNIT BASE PAN
DIMENSIONS
26 X 26
31 1/2 X 31 1/2
35 X 35
TIEDOWN KNOCKOUT LOCATIONS
A
9 1/S
9 1/8
9 1/g
B C
4 7/16 21 1/4
6 9/16 24 11/16
6 9/16 28 7/16
A05177
Fig, 3 - Tiedown Knockout Locations
On rooftop applications, locate unit at least 6 in. above roof
surface.
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Use a brazing shield and wrap TXV with wet cloth or
use heat sink material.
5. Install TXV on indoor coil liquid line. Sweat swivel
adapter to inlet of indoor coil and attach to TXV outlet.
Use backup wrench to avoid damage to tubing or valve.
Sweat inlet of TXV. marked "IN" to liquid line. Avoid
excessive heat which could damage valve.
6. Install vapor elbow with equalizer adapter to suction tube
of line set and suction connection to indoor coil. Adapter
has a 1/4-in. male connector for attaching equalizer tube.
7. Connect equalizer tube of TXV to 1/4-in. equalizer fitting
on vapor line adapter.
8. Attach TXV bulb to horizontal section of suction line
using clamps provided. Insulate bulb with field-supplied
insulation tape. See Fig. 4 for correct positioning of
sensing bulb.
9. Proceed with remainder of unit installation.
_10 O'CLOCK
2 O'CLOCK 7
__ _ SENSING BULB
TRAP
SUCTION TUBE
8 O'CLOCK 4 O'CLOCK
7/8 IN, OD & SMALLER LARGER THAN 7/8 IN. OD
A81032
Fig, 4-Position of Sensing Bulb
Replacing TXV on Puron Indoor Coil
1. Pump system down to 2 psig and recover refrigerant.
2. Remove coil access panel and fitting panel from front of
cabinet.
3. Remove TXV support clamp using a 5/16-in. nut driver.
Save the clamp.
4. Remove Puron TXV using a backup wrench on flare
connections to prevent damage to tubing.
5. Using wire cutters, cut equalizer tube off flush with vapor
tube inside cabinet.
6. Remove bulb from vapor tube inside cabinet.
7. Braze equalizer stub-tube dosed. Use protective barrier as
necessary to prevent damage to drain pan.
IMPORTANT: Route the equalizer tube of R-22 TXV through
suction line connection opening in fitting panel prior to replacing
fitting panel around tubing.
8. Install TXV with 3/S-in. copper tubing through small hole
in service panel. Use wrench and backup wrench, to avoid
damage to tubing or valve, to attach TXV to distributor.
9. Reinstall TXV support clamp (removed in item 3).
10. Attach TXV bulb to vapor tube inside cabinet, in same
location as original was when removed, using supplied
bulb clamps (nylon or copper). See Fig. 4 for correct
positioning of sensing bulb.
11. Route equalizer tube through suction connection opening
(large hole) in fitting panel and install fitting panel in
place.
12. Sweat inlet of TXV, marked "IN" to liquid line. Avoid
excessive heat which could damage valve.
13. Install vapor elbow with equalizer adapter to vapor line of
line set and vapor connection to indoor coil. Adapter has
a 1/4-in. male connector for attaching equalizer tube.
14. Connect equalizer tube of TXV to 1/4-in. equalizer fitting
on vapor line adapter. Use backup wrench to prevent
damage to equalizer fitting.
15. Proceed with remainder of unit installation.
STEP 6 --Make Piping Connections
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could result in personal
injury or death.
Relieve pressure and recover all refrigerant before
system repair or final unit disposal. Use all service
ports and open all flow-control devices, including
solenoid valves.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
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 more than 36-in.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipnmnt
damage or improper operation.
To prevent damage to unit or service valves, observe the
following:
• Use a brazing shield
• Wrap service valves with wet cloth or use a heat sink
material.
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 1 are recommended up to 80 ft. See Product
Data for acceptable alternate vapor diameters and associated
capacity losses. For tubing requirements beyond 80 ft.,
substantial capacity and performance losses can occur. Following
the recommendations in the 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. 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 Factolw Approved Indoor Unit
OuMoor unit contains correct system refrigerant charge for
operation with factory approved ARI rated indoor unit when
connected by 15 ft. of field-supplied or factory-accessory tubing,
and factory supplied filter drier. Check refrigerant charge for
maximum efficiency.
Refrigerant Tubing Connection Outdoor
Connect vapor and liquid tubes to fittings on vapor and liquid
service valves (see Table 1.) Use refrigerant grade tubing
Sweat Connection
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Service valves must be wrapped in a heat-sinking
material such as a wet cloth while brazing.
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 1--Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (In.)
LIQUID
UNIT SIZE
018, 024
030, 036
042, 048
060
Notes:
Connection
Diameter
3/8
3/8
3/8
3/8
1. Tube diameters are for total equivalent lengths up to 80 ft..
2. Do not appty capillary tube or fixed orifice indoor coils to these units.
Tube
Diameter
3/8
3/8
3/8
3/8
R&TED VAPOR
(up to 80 ft.*)
Connection
Diameter
5/8
3/4
7/8
7/8
Tube
Diameter
5/8
3/4
7/8
1 1/8
* For Tubing Set lengths between 80 and 200 ft. horizontal or 20 ft. vertical differential (250 ft,Totat Equivalent Length), refer to the Longline Guideline- Air
Conditioners and Heat Pumps using R-22
Table 2--Accessory Usage
REQUIRED FOR LOW-AMBI- REQUIRED FOR SEA
REQUIRED FOR LONG LINE
Accessory ENT APPLICATIONS COAST APPLICATIONS
(Below 55 °F) APPLICATIONS* (Over 80 Ft.) (Within 2 miles)
Crankcase Heater Yes
Evaporator Freeze Thermostat Yes
Winter Start Control Yes t
Accumulator No
Compressor Start Assist Capacitor Yes
and Relay
Motor Master® Control
or Yes
Low-ambient Pressure Switch
Support Feet Recommended
Liquid Line Solenoid Valve No
Ball Bearing Fan Motor Yesn:
For Tubing Set lengthsbetween 80 and 200 ft, horizontal or 20 ft. vertical differential
ditioners and Heat Pumps using R-22
Yes No
No No
No No
No No
Yes No
No No
No Recommended
See Long- Line Application No
Guideline
No No
250 ft.Total Equivalent Length), refer to the Longline Guideline - Air Con-
SRequiredfor low-ambient controller (full modulation feature) and Motor Master, control only.
tOniy when low pressure switch is used.
Install Liquid-Line Filter Drier Indoor Evacuate Refrigerant Tubing and Indoor Coil
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.
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.
Refer to Fig. 5 and install filter drier as follows:
1. Braze 5-in. liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to above 5-in. liquid tube. Flow arrow
must point towards indoor coil.
4. Connect and braze liquid refrigerant tube to the filter drier.
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 if the procedure outlined below is followed. Always
break a vacuum with dry nitrogen.
Deep Vacuum Method
The deep vacuum method requires avacuum 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. 6)
Fig. 5 - Liquid Line Filter Drier
A05178
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Filter drier must be wrapped in a heat-sinking material
such as a wet cloth while brazing.
LEAK IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
01234 567
MINUTES
A95424
Fig. 6 -Deep Vacuum Graph
Triple Evacuation 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 any liquid
water. Refer to Fig. 7 and proceed as follows:
1. Pump system down to 28 in. of mercury and allow
pump to continue operating for an additional 15
minutes.
2. Close service valves and shut off vacuum pump.
3. Connect a nitrogen cylinder and regulator to system
and open until system pressure is 2 psig.
4. Close service valve and allow system to stand for 1 hr.
During this time, dry nitrogen will be able to diffuse
throughout the system absorbing moisture.
5. Repeat this procedure as indicated in Fig. 7. System
will then be free of any contaminants and water vapor.
I EVACUATE I
[BREAK VACUUM WITH DRY NITROGEN
IEVACUATEI
[BREAK VACUUM WITH DRY NITROGEN
IEVACUATEI
CHECK FOR TIGHT, DRY SYSTEM
(IF IT HOLDS DEEP VACUUM)
[ CHARGE SYSTEM ]
A95425
Fig. 7 - THple Evacuation Method
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.
STEP 7 --Make Electrical Connections
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.
Connect Ground and Power Wires
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 8.
DISCONNECT_q
PER N.E.C. AND/OR_q
LOCAL CODES ]
FIELD POWER
WIRING
3 PHASE ONLY
FIELD GROUND
WIRING J
BLUE
CONTACTOR
(-
.)
©
GROUNDD
LUG
Fig. 8 -Line Connections
A94025
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 Wiles
Remove access panel to gain access to unit wiring. Extend wires
from disconnect through power wiring hole provided and into
unit control box.
OCONTACTOR 24VAC COM O
O
OFF;NO 24VAC L_2
ON:OK
FLASH;PHASE PROBLEM
0 0 o
L3 L1
Fig, 9 -3-Phase Monitor Control
(Applies to 3-Phase Units Only)
AO0010
Table 3--3-Phase Monitor LED Indicators
LED STATUS
No call for compressor opera-
OFF tion
FLASHING Reversed phase
ON Normal
n
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Ensure compressor rotation is correct.
• 3-phase scroll compressors are rotation
sensitive.
• A flash LED on phase monitor indicates
reverse rotation. (See Fig. 9 and Table 3)
This will not allow contractor to be energized.
• Disconnect power to unit and interchange 2
fleld-wirin_ leads on unit contactor.
Connect Control Wiring
Route 24-v control wires through control wiring grommet and
connect leads to control wiring. Refer to Installation Instructions
packaged with thermostat (See Fig. 10)
Use No. 18 AWG color-coded, insulated (35°C minimum) wire.
If thermostat is located more than 100 ft. from unit, as measured
along the control voltage wires, use No. 16 AWG color-coded
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
transfomaer for control power, 24v/40va minimum.
NOTE: Use of available 24v accessories may exceed the
minimum 40va power requirement. Determine total transfommr
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.
STEP 8 --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. Refer to the Application Guideline and Service Manual
Longline Section-Residential Split-System Air Conditioners and
Heat Pumps.
STEP 9 --Install Electrical Accessories
Refer to the individual instructions packaged with kits or
accessories when installing.
STEP 10 --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:
• Do not overcharge system with refrigerant.
• Do not operate unit in a vacuum or at negative pressure.
• Dome temperatures may be hot.
• In 3 phase applications, incorrect phasing will cause reverse
rotation, resulting in elevated noise levels, equalized
pressures and reduced current draw. Correct by reversing
power connection L1 and L2 on contactor.
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
Wear safety glasses, protective clothing, and gloves when
handling refrigerant and observe the following:
• Front seating service valves are equipped with Schrader
valves.
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental
damage.
Federal regulations require that you do not vent refrigerant to
the atmosphere. Recover during system repair or final unit
disposal.
Follow these steps to properl_ start up s_stem:
1. After system is evacuated, fully open liquid and vapor
service valves.
2. Unit is shipped with valve stem(s) front seated (closed)
and caps installed. Replace stem caps after system is
opened to refrigerant flow. Replace caps finger-tight and
tighten with wrench an additional 1/12 turn.
3. Close electrical disconnects to energize system.
4. Set room thermostat at desired temperature. Be sure set
point is below indoor ambient temperature.
5. Set room thermostat to COOL and fan control to ON or
AUTO mode, as desired. Operate unit for 15 minutes.
Check system refrigerant charge.
Sequence of Operation
Turn on power to indoor and outdoor units. Transformer is
energized.
On a call for cooling, thermostat makes circuits R-Y and R-G.
Circuit R-Y energizes contactor, starting outdoor fan motor and
compressor circuit. R-G energizes indoor unit blower relay,
starting indoor blower motor on high speed.
When thermostat is satisfied, its contacts open. de-energizing
contactor and blower relay. Compressor and motors stop.
If indoor unit is equipped with a time-delay relay circuit, the
indoor blower will run an additional 90 seconds to increase
system efficiency.
A/C Typical
THERMOSTAT FURNACE
24 MAC HOT E_-- "--_
24 MAC COM [_"-- -- " ----E_
HEATSTAGE1r-_-qii D
OOOLSTAGE1Fq-- "---E]--
,NOOOREANE}---"--D
AIR
CONDITIONER
10 l
v
A/C
THERMOSTAT
24 MAC HOT
24 VAO OOM E_
HEAT STAGE 1
COOL STAGE 1
INDOOR FAN Eli--
Typical
FAN COIL
a_D
AIR
CONDITIONER
A02326
©
LEGEND
24-V FACTORY WIRING
24-V FIELD WIRING
FIELD SPLICE CONNECTION
CONTACTOR
A97368
Fig. 10 - Generic Wiring Diagrams
(See Thermostat Installation Instructions for specific unit combinations)
STEP 11 --Check Charge
Factory charge and charging method are shown on unit
information plate. To check charge, follow the procedure below
and the subcooling temperature required as shown on charging
table on unit.
NOTE: If subcooling charging conditions are not favorable,
charge must be weighed in accordance with unit rating plate, -+0.6
oz/ft, of 3/8-in. liquid line above or below 15 ft., respectively.
Favorable conditions fall within the ranges given on the charging
chart on the outdoor unit plate.
NOTE: In longline applications, see Application Guideline for
special charging requirements.
EXAMPLE:
To calculate additional charge required for a 25-ft. line set:
25 ft. - 15 ft. = 10 ft. X 0.6 oz/ft. = 6 oz. of additional charge.
Cooling On D Procedure
This system requires charging by the subcooling nmthod.
1. Operate unit a minimum of 10 minutes before checking
charge.
2. Measure liquid service valve pressure by attaching an
accurate gage to service port.
3. Measure liquid line temperature by attaching an accurate
thermistor type or electronic thermometer to liquid line
near outdoor coil.
4. Refer to unit rating plate for required subcooling
temperature.
5. Refer to Table 3. Find the point where required subcooling
temperature intersects measured liquid service valve
pressure.
6. To obtain required subcooling temperature at a specific
liquid line pressure, add refrigerant if liquid line
temperature is higher than indicated or reclaim refrigerant
if temperature is lower. Allow a tolerance of-+3 °F.
STEP 12 --Final Checks
IMPORTANT: Before leaving job, be sure to do the following:
1. Ensure that all wiring is routed away from tubing and
sheet metal edges to prevent rub-through or wire
pinching.
2. Ensure that all wiring and tubing is secure in unit before
adding panels and covers. Securely fasten all panels and
covers.
3. Tighten service valve stem caps to 1/12-turn past finger
tight.
4. Leave Owner's Manual with owner. Explain system
operation and periodic maintenance requirements outlined
in manual.
5. Fill out Dealer Installation Checklist and place in
customer file.
Table 4--Required Subcooling Temperature (°F)
Liquid
Pressure
at Service Required Subcooling Temperature (°F)
Valve
(PSIG) 5 10 15 20
134 71 66 61 56
141 74 69 64 59
148 77 72 67 62
156 80 75 70 65
163 83 78 73 68
171 86 81 76 71
179 89 84 79 74
187 92 87 82 77
196 95 90 85 80
205 98 93 88 83
214 101 96 91 86
223 104 99 94 89
233 107 102 97 92
243 110 105 100 95
253 113 108 103 98
264 116 111 106 101
274 119 114 109 104
285 122 117 112 107
297 125 120 115 110
309 128 123 118 113
321 131 126 121 116
331 134 129 124 119
346 137 132 127 122
359 140 135 130 125
(;ARE 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 Owner's Manual for
information.
Copyright 2005 Calder Crop ° 7310 W Monis St • Indianapolis, IN 46231 Printed in USA
Manufacturer rese_'es the tight to change, at any time. specifications and designs without notice and without obligations.
10
edition date: 0_ 06 Catalo_ No: 24ABR-2SI
Replaces: _4ABR 1SI

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