Carrier Infinity 50DT User manual

Turn to the Expertg
Installation Instructions
IMPORTANT: OAT sensor must be field installed. See
Accessory Installation for more details.
IMPORTANT: This Infinity _unit is designed for use with an
Infinity User Interface.
NOTE: Read the entire instruction manual before starting the
installation.
TABLE OF CONTENTS
Page
SAFETY CONSIDERATIONS ........................ 2
INTRODUCTION .................................. 2
RECEIVING AND INSTALLATION ................ 2-10
Check Equipment ................................. 2
Identify Unit ................................... 2
Inspect Shipment ................................ 2
Provide Unit Support .............................. 2
Roof Curb ..................................... 2
Slab Mount .................................... 2
Ground Mount ................................. 2
Provide Clearances ................................ 6
Rig and Place Unit ................................ 6
Inspection ..................................... 6
Introduction .................................... 6
Use of Rigging Bracket ........................... 6
Select and Install Ductwork .......................... 7
Converting Horizontal Discharge Units to Downflow
(Vertical) Discharge Units ......................... 8
Provide for Condensate Disposal ..................... 8
Install Electrical Connections ........................ 8
High-Voltage Connections ........................ 8
Routing Power Leads Into Unit .................... 10
Connecting Ground Lead to Ground Screw .......... 10
Routing Control Power Wires .................... 10
Accessory Installation ........................... 10
Special Procedures for 208-v Operation ............. 10
PRE-START-UP .................................. 12
START-UP .................................... 12-21
Unit Start-Up ................................ 12-16
Sequence of Operation ......................... 16-19
Check for Refrigerant Leaks ........................ 19
Start-Up Adjustments ............................. 19
Checking Cooling and Heating Control Operation ..... 19
Checking and Adjusting Refrigerant Charge .......... 19
Refrigerant Charge ............................. 19
No Charge .................................... 19
Low Charge Cooling ............................ 19
To Use Cooling Charging Charts ................... 19
Indoor Airflow and Airflow Adjustments ............ 19
Non-Communicating Emergency Cooling/Heating Mode . 19
Fig. 1 - Unit 50DT
C99001
MAINTENANCE ............................... 21-24
Air Filter ....................................... 22
Indoor Fan and Motor ............................. 22
Outdoor Coil. Indoor Coil, and Condensate Drain Pan .... 22
Outdoor Fan .................................... 22
Electrical Controls and Wiring ...................... 22
Refrigerant Circuit ................................ 22
Indoor Airflow . ................................. 22
Metering Devices-TXV & AccuRater Piston .......... 23
Pressure Switches ................................ 23
Loss-of-Charge Switch ........................... 23
High-Pressure Switches ........................... 23
Copeland Scroll Compressor (Puron ®:Refrigerant) ....... 23
Refrigerant System ............................... 23
Refrigerant ................................... 23
Compressor Oil ................................ 23
Servicing Systems on Roofs with Synthetic Materials ... 23
Liquid-Line Filter Drier ......................... 23
Puron (R-410A) Refrigerant Charging .............. 23
TROUBLESHOOTING ............................. 24
FINAL CHECKS .................................. 25
CARE AND MAINTENANCE ....................... 25
START-UP CHECKLIST ........................... 29

SAFETYCONSIDERATIONS
Installationandservicingofthisequipmentcanbehazardousdueto
mechanicalandelectricalcomponents.Onlytrainedandqualified
personnelshouldinstall,repair,orservicethisequipment.
Untrainedpersonnelcanperformbasicmaintenancefunctionssuch
ascleaningandreplacingairfilters.Allotheroperationsmustbe
performedbytrainedservicepersonnel.Whenworkingonthis
equipment,observeprecautionsintheliterature,ontags,andon
labelsattachedtoorshippedwiththeunitandothersafety
precautionsthatmayapply.
Followallsafetycodes.Installationmustbeincompliancewith
localandnationalbuildingcodes.Wearsafetyglasses,protective
clothing,andworkgloves.Havefireextinguisheravailable.Read
theseinstructionsthoroughlyandfollowallwarningsorcautions
includedinliteratureandattachedtotheunit.
Recognizesafetyinformation.Thisisthesafety-alertsymbol'_.
Whenyouseethissymbolontheunitandininstructionsormanuals,
bealerttothepotentialforpersonalinjury.Understandthesesignal
words:DANGER.WARNING,andCAUTION.Thesewordsare
usedwiththesafety-alertsymbol.DANGERidentifiesthemostse-
rioushazardswhichwillresultinseverepersonalinjuryordeath.
WARNINGsignifieshazardswhichcouldresultinpersonalinjury
ordeath.CAUTIONisusedtoidentifyunsafepracticeswhichmay
resultinminorpersonalinjuryorproductandpropertydamage.
NOTEisusedtohighlightsuggestionswhichwillresultinen-
hancedinstallation,reliability,oroperation.
ELECTRICALSHOCKHAZARD
Failuretofollowthiswarningcouldresultinpersonalinjury
ordeath.
Beforeinstallingorservicingsystem,alwaysturnoffmain
powertosystem.Theremaybemorethanonedisconnect
switch.Turnoffaccessoryheaterpowerswitchifapplicable.
UNITOPERATIONANDSAFETYHAZARD
Failuretofollowthiswarningcouldresultinpersonalinjury
orequipmentdamage.
Puron(R-410A)systemsoperateathigherpressuresthan
standardR-22systems.DONOTuseR-22service
equipmentorcomponentsonPurnn(R-410A)equipment.
EnsureserviceequipmentisratedforPuron(R-410A).
INSPECTSHIPMENT
Inspectforshippingdamagewhileunitisstillonshippingpallet.If
unitappearstobedamagedoristornloosefromitsanchorage,have
itexaminedbytransportationinspectorsbeforeremoval.Forward
claimpapersdirectlytotransportationcompany.Manufactureris
notresponsibleforanydamageincurredintransit.Checkallitems
againstshippinglist.ImmediatelynotifythenearestCarrieroffice
ifanyitemismissing.Topreventlossordamage,leaveallpartsin
originalpackagesuntilinstallation.
Step2--ProvideUnitSupport
Forhurricanetiedowns,contactdistributorfordetailsandPE
(ProfessionalEngineering)Certificate,ifrequired.
ROOFCURB
Installaccessoryroofcurbinaccordancewithinstructionsshipped
withcurb(SeeFig.4).Installinsulation,cantstrips,roofing,and
flashing.Ductworkmustbeattachedtocurb.
IMPORTANT:Thegasketingoftheunittotheroofcurbiscritical
forawatertightseal.Installgasketingmaterialsuppliedwiththe
roofcurb.Improperlyappliedgasketingalsocanresultinairleaks
andpoorunitperformance.
Curbshouldbeleveltowithin1/4in.(SeeFig.2).ThisisnecessaU
for unit drain to function properly. Refer to accessory roof curb
installation instructions for additional information as required.
B
3
MAXIMUM ALLOWABLE
DIFFERENCE (in,)
A-B B-C A-C
1/4 1/4 1/4
C99065
Fig. 2 - Unit Leveling Tolerances
SLAB MOUNT
Place the unit on a solid, level concrete pad that is a minimum of 4
in. thick with 2 in. above grade. The slab should extend
approximately 2 in. beyond the casing on all 4 sides of the unit (See
Fig. 3). Do not secure the unit to the slab except when required by
local codes.
INTRODUCTION
The 50DT packaged heat pump is fully self- contained and designed
for outdoor installation (See Fig. 1). Standard units are shipped in
a horizontal-discharge configuration for installation on a
ground-level slab or directly on the ground if local codes permit.
Standard units can be converted to downflow (vertical) discharge
configurations for rooftop applications.
RECEIVING AND INSTALLATION
Step 1--Check Equipment
IDENTIFY UNIT
The unit model number and serial number are printed on the unit
informative plate. Check this information against shipping papers.
7
EVAR COIL. COND COIL
Fig. 3- Slab Mounting Detail
C99096
GROUND MOUNT
The unit may be installed either on a slab or placed directly on the
ground if local codes permit. Place the unit on level ground prepared
with gravel for condensate discharge.

Roof Curb for Small Cabinet
Note A: When unit mounting screw is used,
retainer bracket must also be used,
Roof Curb for Large Cabinet
Note A: When unit mounting screw is used,
retainer bracket must also be used,
UNIT SIZE
024-030
036-060
E
Long
Support
Support
A
R/A
\\\\\ _Gasket around _
duct
S/A
/2
/
insulated
deck pan Gasket around
outer edge \ \
\\,\
NOTES:
ODS CATALOG A B
NUMBER IN. (MM) IN. (MM)
CPRFCURB008A00 8 (203) 11 (279)
CPRFCURB00FA00 14 (356) 11 (279)
CPRFCURB008A00 8 (203) 16-3/16 (411)
CPRFCURB009A00 14 (356) 16-3/16 (411)
[. Roof curb must be set up for unit being installed.
C
IN. (MM)
16-1/2 (419)
16-1/2 (419)
17-3/8 (441)
17-3/8 (441)
D
IN. (MM)
28-3/4 (730)
28-3/4 (730)
40-1/4 (1022)
40-1/4 (1022)
E
IN. (MM)
30-3/8 (771)
30-3/8 (771)
41-15/16 (1065)
41-15/16 (1065)
F
IN. (MM)
44-5/16 (1126)
44-5/16 (1126)
44-7/16 (1129)
44-7/16 (1129)
A05308
G
IN. (MM)
45-15/16 (1167)
45-15/16 (1167)
46 - 1/16 (1169)
46-1/16 (1169)
2. Seat strip must be applied, as required, to unit being installed.
3. Dimensions are in inches.
4. Dimension in ( )are in millimeters.
5. Roof curb is made of 16 gauge steel.
6. Attach ductwork to curb (flanges of duct rest on curb).
7. Inadated panels: I in. thick fiberglass 1 lb. density.
S. When unit mounting screw is used (see Note A). a retainer bracket must be used as well. This bracket must also be used when required by code for hurricane or seismic
conditions. This bracket is available through Micrometl.
Fig. 4 - Roof Curb Dimensions

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Step 3--Provide Clearances
The required minimum service clearances are shown in Fig. 5 and
6. Adequate ventilation and outdoor air must be provided. The
outdoor fan draws air through the outdoor coil and discharges it
through the top fan grille. Be sure that the fan discharge does not
recirculate to the outdoor coil. Do not locate the unit in either a
corner or under an overhead obstruction. The minimum clearance
under a partial overhang (such as a normal house overhang) is 48 in.
above the unit top. The maximum horizontal extension of a partial
overhang must not exceed 48 in.
IMPORTANT: Do not restrict outdoor airflow. An air restriction at
either the outdoor-air inlet or the fan discharge may be detrimental
to compressor life.
Do not place the unit where water, ice, or snow from an overhang
or roof will damage or flood the unit. Do not install the unit on
carpeting or other combustible materials. Slab-mounted units
should be at least 4 in. above the highest expected water and runoff
levels. Do not use unit if it has been under water.
Step 4--Rig and Place Unit
Rigging and handling of this equipment can be hazardous for many
reasons due to the installation location (roofs, elevated structures,
etc.).
Only trained, qualified crane operators and ground support staff
should handle and install this equipment.
When working with this equipment, observe precautions in the
literature, on tags, stickers, and labels attached to the equipment, and
any other safety precautions that might apply.
Training for operators of the lifting equipment should include, but
not be limited to. the following:
1. Application of the lifter to the load, and adjustment of the
lifts to adapt to various sizes or kinds of loads.
2. Instruction in any special operation or precaution.
3. Condition of the load as it relates to operation of the lifting
kit, such as balance, temperature, etc.
Follow all applicable safety codes. Wear safety shoes and work
gloves.
INSPECTION
Prior to initial use, and at monthly intervals, all rigging brackets and
straps should be visually inspected for any damage, evidence of
wear. structural deformation, or cracks. Particular attention should
be paid to excessive wear at hoist hooking points and load support
areas. Brackets or straps showing any kind of wear in these areas
nmst not be used and should be discarded.
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing or servicing system, always turn off main
power to system. There may be more than one disconnect
switch. Turn off accessory heater power switch if applicable.
Tag disconnect switch with a suitable warning label.
This bracket is to be used to rig/lift a Small Packaged Product onto
roofs or other elevated structures.
PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in personal
injury/death or property damage.
Rigging brackets for one unit use only. When removing a
unit at the end of its useful life, use a new set of brackets.
USE OF RIGGING BRACKET
Field Installation of Rigging Bracket
1. If applicable, remove unit from shipping carton. Leave top
shipping skid on the unit for use as a spreader bar to prevent
the rigging straps from damaging the unit. If the skid is not
available, use a spreader bar of sufficient length to protect the
unit from damage.
2. Remove 4 screws in unit corner posts.
3. Attach each of the 4 metal rigging brackets under the panel
rain lip (See Fig. 7). Use the screws removed in step 2 above
to secure the brackets to the unit.
PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in personal
injury/death or property damage.
Rigging bracket MUST be under the rain lip to provide
adequate lifting.
PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in personal
injury/death or property damage.
Do not strip screws when re-securing the unit. If a screw is
stripped, replace the stripped one with a larger diameter screw
(included).
Ri_in_/Liftin_ of Unit
1. Bend top of brackets down approximately 30 degrees from
the corner posts.
2. Attach straps of equal length to the rigging brackets at
opposite ends of the unit. Be sure straps are rated to hold the
weight of the unit (See Fig. 7).
3. Attach a clevis of sufficient strength in the middle of the
straps. Adjust the clevis location to ensure unit is lifted level
with the ground.
4. After unit is securely in place detach rigging straps. Remove
corner posts, screws, and rigging brackets then reinstall
screws.
UNIT FALLING HAZARD
Failure to follow this warning could result in personal injury
or death.
Never stand beneath rigged units or lift over people.
INTRODUCTION
The lifting/rigging bracket is engineered and designed to be
installed only on Small Packaged Products.
UNIT FALLING HAZARD
Failure to follow this warning could result in personal
injury/death or property damage.
When straps are taut, the clevis should be a minimum of 36
inches above the unit top cover.
After the unit is placed on the roof curb or mounting pad, remove
the top crating.

DETAIL A
I
MNMUM HEIGHT: 36"
SEE DETAIL Aj
UNITHEIGHT
RIGGING
CABINET MODEL WEIGHT A B C D
50DT-024 382 75 57 91 158
Small 50DT-030 387 76 58 93 160
50DT-036 469 93 71 113 192
50DT-042 491 97 74 118 201
Large 50DT- 048 497 104 63 136 193
50DT-060 548 117 75 149 207
Y
D
Fig. 7-Suggested Rigging
X
C05161
B
C
A07113
Step 5--Select and Install Ductwork
The design and installation of the duct system must be in accordance
with the standards of the NFPA for installation of non-residence
type air conditioning and ventilating systems, NFPA 90A or
residence type, NFPA 90B and/or local codes and ordinances.
Select and size ductwork, supply-air registers, and return air grilles
according to ASHRAE (American Society of Heating,
Refrigeration. and Air Conditioning Engineers) recommendations.
The unit has duct flanges on the supply- and return - air openings on
the side of the unit.
PERSONAL AND PROPERTY DAMAGE HAZARD
Failure to follow this warning could result in personal injury,
death and/or property damage.
For vertical supply and return units, tools or parts could drop
into ductwork, therefore, install a 90 degree turn in the return
ductwork between the unit and the conditioned space. If a 90
degree elbow cannot be installed, then a grille of sufficient
strength and density should be installed to prevent objects
from falling into the conditioned space. Units with electric
heaters require 90 degree elbow in supply duct.
When designing and installing ductwork, consider the following:
1. All units should have field- supplied filters or accessory filter
rack installed in the return-air side of the unit.
Recommended sizes for filters are shown in Table 1.
2. Avoid abrupt duct size increases and reductions. Abrupt
change in duct size adversely affects air performance.
IMPORTANT: Use flexible connectors between ductwork and
unit to prevent transmission of vibration. Use suitable gaskets to
ensure weather tight and airtight seal. When electric heat is installed.
use fireproof canvas (or similar heat resistant material) connector
between ductwork and unit discharge connection. If flexible duct is
used, insert a sheet metal sleeve inside duct. Heat resistant duct
connector (or sheet metal sleeve) must extend 24-in. from electric
heater element.
3. Size ductwork for max possible air flow (See Table 1).
4. Seal. insulate, and weatherproof all external ductwork. Seal,
insulate and cover with a vapor barrier all ductwork passing
through conditioned spaces. Follow latest Sheet Metal and
Air Conditioning Contractors National Association
(SMACNA) and Air Conditioning Contractors Association
(ACCA) minimum installation standards for residential
heating and air conditioning systems.
5. Secure all ducts to building structure. Flash, weatherproof,
and vibration-isolate duct openings in wall or roof
according to good construction practices.

ii
CONVERTING HORIZONTAL DISCHARGE UNITS TO
DOWNFLOW (VERTICAL) DISCHARGE UNITS
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing or servicing system, always turn off main
power to system. There may be more than one disconnect
switch. Turn off accessor) 7 heater power switch if applicable.
1. Open all electrical disconnects and install lockout tag before
starting any service work.
2. Remove side duct covers to access bottom return and supply
knockouts.
NOTE: These panels are held in place with tabs similar to an
electrical knockout.
3. Use a screwdriver and hammer to remove the panels in the
bottom of the composite unit base.
4. Ensure the side duct covers are in place to block off the
horizontal air openings (See Fig. 8).
Step 6--Provide for Condensate Disposal
NOTE: Ensure that condensate water disposal methods comply
with local codes, restrictions, and practices.
The units dispose of condensate through a 3/4 -in. NPT female
fitting that exits on the compressor end of the unit. Condensate water
can be drained directly onto the roof in rooftop installations (where
permitted) or onto a gravel apron in ground level installations.
Install a field-supplied condensate trap at end of condensate
connection to ensure proper drainage. Make sure that the outlet of
the trap is at least 1 in. lower than the drain-pan condensate
connection to prevent the pan from overflowing. Prime the trap with
water. When using a gravel apron, make sure it slopes away from the
unit.
If the installation requires draining the condensate water away from
the unit. install a field-supplied 2-in. trap at the condensate
connection to ensure proper drainage. Condensate trap is available
as an accessory or is field-supplied. Make sure that the outlet of the
trap is at least 1 in. lower than the unit drain-pan condensate
connection to prevent the pan from overflowing. Connect a drain
trough using a minimum of field-supplied 3/4 -in. PVC or
field-supplied 3/4 -in. copper pipe at outlet end of the 2 -in. trap
(See Fig. 9). Do not undersize the tube. Pitch the drain trough
downward at a slope of at least 1 in. for every 10 ft. of horizontal run.
Be sure to check the drain trough for leaks. Prime the trap at the
beginning of the cooling season start-up.
Step 7--Install Electrical Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
The unit cabinet must have an uninterrupted, unbroken
electrical ground. This ground may consist of an electrical
wire connected to the unit ground screw in the control
compartment, or conduit approved for electrical ground when
installed in accordance with NEC, ANSI/NFPA American
National Standards Institute/National Fire Protection
Association (latest edition) (in Canada. Canadian Electrical
(:ode CSA C22.1) and local electrical codes.
HIGH-VOLTAGE CONNECTIONS
The unit must have a separate electrical service with a
field-supplied, waterproof disconnect switch mounted at, or within
sight from. the unit. Refer to the unit rating plate, NEC and local
codes for maxinmm fuse/circuit breaker size and minimum circuit
amps (ampacity) for wire sizing (See Table 2 for electrical data).
The field-supplied disconnect may be mounted on the unit over the
high-voltage inlet hole (See Fig. 5 and 6).
If the unit has an electric heater, a second disconnect may be
required. Consult the Installation. Start-Up, and Service
Instructions provided with the accessory for electrical service
connections.
Operation of unit on improper line voltage constitutes abuse and
may cause unit damage that could affect warranty.
UNIT COMPONENT DAMAGE HAZARD
Failure to follow this caution may result in damage to the unit
being installed.
1. Make all electrical connections in accordance with NEC
ANSI/NFPA (latest edition) and local electrical codes
governing such wiring. In Canada. all electrical
connections must be in accordance with CSA standard
(:22.1 Canadian Electrical Code Part i and applicable local
codes. Refer to unit wiring diagram.
2. Use only copper conductor for connections between
field-supplied electrical disconnect switch and unit. DO
NOT USE ALUMINUM WIRE.
3. Be sure that high-voltage power to unit is within operating
voltage range indicated on unit rating plate.
4. Insulate low-voltage wires for highest voltage contained
within conduit when low-voltage control wires are in same
conduit as high-voltage wires.
5. Do not damage internal components when drilling through
any panel to mount electrical hardware, conduil etc.
?!i
o/
/i I
SUPPLY RETURN
DUCT DUCT
OPENING OPENING
1" (25ram) MIN
Fig. 8 - 50DT with Duct (:overs On
Fig. 9 - Condensate Trap
099011
099013

JNIT SIZE
_IOMINAL CAPACITY (ton)
:)PERATING WEIGHT (lb.)
3OMPRESSOR
:_EFRIGERANT: PURON (R-410A) Quantity (lb.)
EXPANSION DEVICE- HEATING
ORIFICE OD (in.) - Left
ORIFICE OD (in.) - Right
-XPANSION DEVICE-COOLING
Size
Part Number
Table 1--Physical Data -Unit 50DT
024 048 060
2 4 5
405 492 535
10.3 15,5 16,0
0.040 0,038 0,046
N/A 0,046 0,046
030
2-1/2
435
11.5
0.038
0.038
3 Ton
EA38YD 139
2_ .21
15,3
2700
22
1/8 (825)
3_.17
3.7
036 042
3 3-1/2
464 476
Two-Stage Scroll
9,7 14,0
AccuRater
0.035 0,040
0.035 0,042
TXV
3Ton 4Ton
EA36YD139 EA38YD 149
2...21 2_.21
17.5 19,4
2800 2800
22 22
1/8 (825) 1/8 (825)
3...17 3_.17
4,7 4.7
2Ton 4Ton 5Ton
EA36YD129 EA38YD149 EA38YD159
3UTDOOR COIL
Rows...Fins/in. 2...21 2_ .21 2_ .21
Face Area (sq. ft.) 13.6 18,4 23,3
3UTDOOR FAN
Nominal Cfm 2700 3300 3300
Diameter 22 22 22
Motor HP (RPM) 1/8 (825) 1/4 (1100) 1/3 (1110)
NDOOR COIL
Rows... Fins/in. 3... 17 3... 17 4... 17
Face Area (sq. ft.) 3,7 5.7 5.7
INDOOR FAN
Nominal Airflow (Cfm)
Comfort Variabte based on Comfort Settings (see User Interface instructions for more information).
Efficiency 700 875 1050 1225 1400 1750
Max 800 1000 1200 1400 1600 2000
Size (in.) 10x10 10x10 11x10 11x10 11x10 11x10
Motor HP (RPM) 1/2 1/2 3/4 3/4 3/4 1
-IIGH-PRESSURE SWITCH (psig)
Cutout 670 _+ 10
Reset (Auto) 470 _+25
-IIGH-PRESSURE SWITCH 2(peig)
Compressor Solenoid)
Cutout 565 _+ 15
Reset (Auto) 455 _+ 15
_OSS-OF-CHARGE/LOW- PRESSURE SWITCH
(Liquid Line) (psig)
Cutout 23 _+ 5
Reset (Auto) 55 _+5
:_ETURN-AIR FILTERS (in,)* 20x24x1 20x24x1 24x30x1 24x36x1 24x36x1 24x36x1
Throwaway
Required filter sizes shown are based on tile larger of tile ARI (Air Conditioning and Refrigeration hlstitute) rated cooling airflow or the heating airflow velocity of 300 ftitllinllte
for throwaway type or 450 ft/minute for high capacity type. Air filter pressure drop for 11011 standard filters must not exceed 0.08 in. we.
INDOOR
THERMOSTAT
RETURN
"_-_ FROM
TOP POWER -- _
SOURCE
Fig. 10 - Typical Installation
DISCONNECT
PER NEC
<FF
C99061

ROUTING POWER LEADS INTO UNIT
Use only copper wire between disconnect and unit. The high
voltage leads should be in a conduit until they enter the duct panel;
conduit termination at the duct panel nmst be watertight. Run the
high-voltage leads through the power entry knockout on the power
entry side panel. See Fig. 5 and 6 for location and size. For
single-phase units, connect leads to the black and yellow wires.
CONNECTING GROUND LEAD TO GROUND SCREW
Connect the ground lead to the chassis using the ground screw in the
wiring splice box (See Fig. 11).
ROUTING CONTROL POWER WIRES
For detailed instruction on the low voltage connections to the User
Interface (UI), refer to the UI installation guide.
Form a drip-loop with the control leads before routing them into the
unit. Route the low voltage control leads through grommeted.
low-voltage hole provided into unit (See Fig. 5 and 6). Connect user
interface leads to unit control power leads as shown in Fig. 13.
The unit transformer supplies 24-v power for complete system
including accessory electrical heater. A circuit breaker is provided
in the 24-v circuit as a protection device (See Fig. 16); see the
caution label on the transformer. Transformer is factory wired for
230-v operation. If supply voltage is 208-v, rewire transformer
primary as described in Special Procedures for 208-v Operation
section.
The fan coil board is fused by a board-mounted automotive fuse
placed in series with transformer SEC 1 and R circuit (See F1 on Fig.
14). The (7 circuit of transformer circuit is referenced to chassis
ground through a printed circuit run at SEC2 and metal control
board mounting eyelets. Check to be sure control board is mounted
securely using both factory-installed screws.
ACCESSORY INSTALLATION
A. Accessory Electric Heaters
Electric heaters may be installed in 50DT per instructions supplied
with electric heater package. See unit rating plate for
factory-approved electric heater kits.
NOTE: Units installed without electric heat should have a
factory-supplied sheet metal block-off plate installed over heater
opening. This reduces air leakage and formation of exterior
condensation.
B. Outdoor Air Thermistor (OAT)
NOTE: THE INSTALLATION OF AN OUTDOOR
TEMPERATURE SENSOR USING THE INFINITY
CONTROL BOARD OAT TERMINALS IS REQUIRED.
MANY INFINITY FEATURES (ELECTRIC HEAT
LOCKOUT, AUTO HUMIDITY CONTROL, COMFORT
ROLLBACK) WILL BE LOST IF THE OAT IS NOT
CONNECTED.
For detailed mounting instructions for the OAT sensol; please
refer to TSTATXXSEN01-B installation instructions (catalog
no. 63TS-TAI3); Procedures 1 through 3.
The OAT input is used to supply outdoor temperature data for
system level functions and for temperature display on UI. Using two
wires of the field-supplied thermostat wire cable, wire the ends of
the two black OAT pigtails. Wire the opposite ends of these two
wires to the OAT provided with the UI. There is no polarity to be
observed.
NOTE: Mis-wiring OAT inputs will not cause damage to either
Infinity control or thermistor. If the thermistor is wired incorrectly,
no reading will appear at UI. Re-wire thermistor correctly for
normal operation.
C. Humidifier Connections
The fan coil control board terminal marked HUM is provided for
low voltage (24-vac) control of a humidifier. No humidistat is
required as UI monitors indoor humidity.
When commanded to operate humidifier, the unit control will
energize the HUM output to turn humidifier on and de-energize
HUM output to turn humidifier off. Wire HUM and C terminals
directly to humidifier as shown in Fig. 13.
SPECIAL PROCEDURES FOR 208-V OPERATION
Be sure unit disconnect switch is open.
Disconnect the yellow primary lead from the transformer. See unit
wiring label (See Fig. 16).
Connect the yellow primary lead to the transformer terminal labeled
200-v.
GROUND SCREW
(IN SPLICE BOX)
SINGLE-PHASE L!
CONNECTIONS
TO DISCONNECT
PER NEC L2
GROUND
LEAD
NOTE: Use copper wire only.
LEGEND
NEC - National Electrical Code
- - - Field Wiring
Splice Connections
A06299
Fig. 11 - Line Power Connections
Fig. 12 - Control Plate
A06812
10

User Infinity Fan Coil Infinity HP/AC
interface Board Board
Outdoor AB Thermistor
{Supplied with UI)
FIELD CONNECTION
REQUIRED
(BLACK WIRES)
Outdoor Coil Thermistor
FACTORY CONNECTED
LEGEND
Factory Wiring
Field Wiring
FACTORY WIRES PROVIDED
FOR FIELD CONNECTION
OF UTILITY CURTAILMENT
A06281
Fig. 13 - Control Voltage Wiring Connections
UNIT SIZE
024
030
036
O42
048
060
V-PH-HZ
208/230-1-60
208/230-1-80
208/230-1-60
208/230-1-80
208/230-1-80
208/230-1-80
Table 2--Electrical Data_50DT
VO LTAG E
RANGE
MIN MAX
187 253
187 253
187 253
187 253
187 253
187 253
COMPRESSOR OFM IFM
FLA FLA
RLA LRA
15.3 52.0 0.9 4.3
18.8 70.0 0.9 4.3
16.7 82.0 0.9 6.8
21,8 96.0 0.9 8.8
27.8 96.0 1.5 6.8
27.3 118.0 1.9 9.1
LEGEND
FLA Full Load Amps
LRA Locked Rotor Amps r
MCA Minh_num Circuit Amps
MOCP Maximum Overcurrent Protection
RLA Rated Load Amps
NOTES:
1 In compliance with NEC (National Electrical Code) requirements
for multimotor and combination load equipment (refer to NEC
Articles 430 and 440), the overcurrent protective device for the
unit shall be Power Supply fuse. The CGA (Canadian Gas
Association) units may be fuse or circuit breaker.
8 Minimum wire size is based on 60 C copper wire. If other than
80 C wire is used, or if length exceeds wire length in table
determine size from NEC.
ELECTRIC HEAT
NOMINAL FLA
kW*
-/- -/-
3.8/5.0 18.1/20.8
5.4/7.2 26.0/30.0
7,5/10.0 38,1/41.7
-/- -/-
3.8/5.0 18,1/20.8
5.4/7.2 28.0/30.0
7.5/10.0 38,1/41.7
11,3/15,0 54,2/82.5
-/- -/-
3.8/5.0 18.1/20.8
5.4/7.2 28.0/30.0
7.5/10.0 38,1/41.7
11,3/15,0 54,2/82.5
-/- -/-
3.8/5.0 18.1/20.8
5.4/7.2 28.0/30.0
7.5/10.0 38.1/41.7
11.3/15.0 54.2/82.5
15.0/20,0 72.2/83.3
-/- -/-
3.8/5.0 18.1/20.8
5.4/7.2 28.0/30.0
7.5/10.0 38.1/41.7
11.3/15.0 54.2/82.5
15.0/20,0 72.2/83.3
-/- -/-
3.8/5.0 18.1/20.8
5.4/7.2 28.0/30.0
7.5/10.0 38.1/41.7
11.3/15.0 54.2/82.5
15.0/20,0 72.2/83.3
SINGLE POINT POWER
SUPPLY
MCA MOCP
24.3/24.3 35/35
46.9/50.3 50/60
56.8/61.8 80/70
69.4/76,4 70/80
28.2/26.2 40/40
48.7/52.2 80/60
58.7/83.7 80/70
71.3/78.3 80/80
93,9/104.3 100/110
28.6/28.6 45/45
51.2/54.6 60/60
61.1/66.1 70/70
73.7/80.7 80/90
96,3/106.7 100/110
34.9/34.9 50/50
57.5/80.9 70/70
67.4/72,4 80/80
80.0/87.0 90/90
102.8/113.0 110/125
125.2/139,1 150/150
43.1/43.1 60/60
85.7/89.1 80/90
75.8/80.6 90/100
88.2/95.2 100/110
110.8/121.2 125/125
133.4/147,3 150/150
45.2/45.2 60/60
87.7/71.2 90/90
77.6/82.7 90/100
90.3/97.2 100/110
112.9/123.3 125/125
135.4/149,3 150/150
11

PRE- START- UP
FIRE, EXPLOSION, ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death and/or property damage.
1. Follow recognized safety practices and wear protective
goggles when checking or servicing refrigerant system.
2. Do not operate compressor or provide any electric power
to unit unless compressor terminal cover is in place and
secured.
3. Do not remove compressor terminal cover until all
electrical sources are disconnected and tagged.
4. Relieve and recover all refrigerant from system before
touching or disturbing anything inside terminal box if
refrigerant leak is suspected around compressor terminals.
5. Never attempt to repair soldered connection while
refrigerant system is under pressure.
6. Do not use torch to remove any component. System
contains oil and refrigerant under pressure.
7. To remove a component, wear protective goggles and
proceed as follows:
a. Shut off electrical power to unit and install lockout
tag.
b. Relieve and reclaim all refrigerant from system
using both high- and low-pressure ports.
c. Cut component connecting tubing with tubing
cutter and remove component from unit.
d. Carefully unsweat remaining tubing stubs when
necessary. Oil can ignite when exposed to flame.
Use the Start-Up Checklist supplied at the end of this book and
proceed as follows to inspect and prepare the unit for initial start-up:
1. Remove all access panels.
2. Read and follow instructions on all DANGER, WARNING,
CAUTION. and INFORMATION labels attached to, or
shipped with unit.
3. Make the following inspections:
a. Inspect for shipping and handling damages, such as
broken lines, loose parts, disconnected wires, etc.
b. Inspect for oil at all refrigerant tubing connections and on
unit base. Detecting oil generally indicates a refrigerant
leak. Leak test all refrigerant tubing connections using
electronic leak detector, or liquid-soap solution. If a
refrigerant leak is detected, see following Check for
Refrigerant Leaks section.
c. Inspect all field- and factory-wiring connections. Be
sure that connections are completed and tight.
d. Ensure wires do not touch refrigerant tubing or sharp
sheet metal edges.
e. Inspect coil fins. If damaged during shipping and
handling, carefully straighten fins with a fin comb.
4. Verify the following conditions:
a. Make sure that outdoor fan blade is correctly positioned
in fan orifice (See Fig. 19).
b. Make sure that condensate drain pan and trap are filled
with water to ensure proper drainage.
c. Make sure that all tools and miscellaneous loose parts
have been removed.
5. Compressors are internally spring mounted. Do not loosen
or remove compressor holddown bolts.
6. Each unit system has two Schrader-type ports, one low-side
Schrader fitting located on the suction line, and one
high-side Schrader fitting located on the compressor
discharge line. Be sure that caps on the ports are tight.
START-UP
Step 1---Unit Start-Up
NOTE: Always check high- and low-voltage supply to the unit
components. Check the integrity of the plug receptacle connections
and unit wiring harness prior to assuming a component failure.
A. LED Description
LEDs built into Infinity control boards provide installer or service
person information concerning operation and/or fault condition of
the unit controls and the Indoor Fan ECM motor. This information
is also available at the system UI in text with basic troubleshooting
instructions. Careful use of information displayed will reduce the
need for extensive manual troubleshooting.
Both the Fan Coil and Heat Pump (HP)/Air Conditioner (AC)
boards have an amber LED and a green LED located near the
System Communications connector (ABCD) (upper right center of
the Fan Coil board, lower right corner of the HP/AC board as
installed in the unit). The amber LED is the System Status LED.
labeled STATUS. The green LED, labeled COMM. is used as an
indicator of system communications status (See Fig 14-15).
Status Codes will be displayed on the STATUS LED using the
following protocol:
1. The number of short flashes indicates first digit of code.
2. The number of long flashes indicates second digit of code.
3. A short flash is 0.25 seconds on. A long flash is 1 second on.
4. The time between flashes is 0.25 seconds.
5. The time between last short flash and first long flash is 1
second.
6. The LEDs will be off for 2.5 seconds before repeating code.
7. If multiple status codes are active concurrently, the highest
priority status code is displayed.
On the Fan Coil board, a second amber LED located at the bottom
center of the control board, adjacent to the motor harness plug, is the
motor status LED, labeled MOTOR. The motor status LED will
flash during normal blower operation.
B. Control Start-Up and System Communications
Troubleshooting
On power up, green COMM LEDs will be turned off until
successful system communications are established (this should
happen within 10 seconds). Once communications with UI are
successful, both COMM LEDs will be lit and held on. At the same
time. amber STATUS LEDs will be lit and held continuously on
until a request for operating mode is received. The STATUS LED
will be on any time unit is in idle mode.
If. at any time. communications are not successful for a period
exceeding 2 minutes, the Infinity control will only allow emergency
heating or cooling operation using a common thermostat and the
terminal strip connections on the two control boards (see
Non-Communicating Emergency Cooling/Heating Mode) and
will display Status Code 16, System Communication Fault. on
amber STATUS LED. No further troubleshooting information will
be available at UI until communications are re-established.
If either COMM LED does not light within proper time period and
status codes are not displayed;
1. Check system transfornrer high- and low-voltage to be sure
the systenr is powered.
2. Check ABCD connection on both boards.
3. Check fuse on fan coil board to be sure it is not blown. If fuse
is open, check systenr wiring before replacing it to be sure a
short does not cause a failure of replacement fuse.
12

IfCOMMLEDdoesnotlightwithinpropertimeperiodandstatus
codeisdisplayed,
1.ChecksystemwiringtobesureUI ispoweredand
connectionsaremadeAtoA,BtoB,etc.andwiringisnot
shorted.Mis-wiringor shortingof the ABCD
communicationswiringwill not allowsuccessful
communications.
NOTE:Shortingormis-wiringlow-voltagesystemwiringwillnot
causedamagetounitcontrolorUIbutmaycauselowvoltagefuse
toopen.
C.Indoor Fan Motor (IFM) Troubleshooting
The indoor fan is driven by an Electronic Computated Motor
(ECM) which consists of two parts: the control module and the
motor winding section. Do not assume motor or module is defective
if it will not start. Use the designed-in LED information aids and
follow troubleshooting steps described below before replacing
motor control module or entire motor. Motor control module is
available as a replacement part.
VERIFY MOTOR WINDING SECTION
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
After disconnecting power from the ECM motor, wait at least
5 minutes before removing the control section. Internal
capacitors require time to discharge.
Before proceeding to replace a motor control module:
1. Check motor winding section to be sure it is functional.
2. Remove motor control module section and unplug winding
plug. Motor shaft should turn freely, resistance between any
two motor leads should be similar and resistance between
any motor lead and unpainted motor end should exceed
100.000 ohms.
3. Failing any of these tests, entire ECM motor must be
replaced.
4. Passing all of the tests, motor control module alone can be
replaced.
[
SEO-2 SEO-1
o
>
oMar_
Fig. 14 - Detail of Fan Coil Board
A03169
4]I] ° O0
0
4]I]o O0 l
0
o
_0
oO0
0
O0
rlqui6 Lille Solenoid
*SUPPLIED BY UTILITY PROVIDER
Fig. 15 -2-Stage HP/AC Control Board
A05247
13

SCHEMATIC
MAX _814 /dIRE "
SZ 2 A'A6
ii
E()UP GND
UK!
mH_ i/ I /:
I-U_
i i
LJ
mRD
i i _)I I
U-- U I
i I ()g I I
II I
II I
IS .J
UN£[ COMFONENT ARRANGEt4ENT
EC_OH S_C110N
D
D
HODELS ONLY
P5 '_
CONTROL BOARD
rio
I[
UT lily CURTA!I MENI
OPTIOP_AtCONNECTIO'_ONL/
(FAC ORY _RS PROVIDED NOI ONNEC ED
Z_ ........... LEGEND
O TER_I_L _KED_ _C CAPAC_oRCO_I_CIOR
IE_A_ _UN_E_ I C_K CASE _l[_IE_
0 SPLICE CO_P COMPRESSOR,O_e_
C_SP_[CE _M_K_D)
-- --HELD COntrOL_]RI_C _0 G_OU_
---HEL_ PO_ER_I_G _PS H_6H PRESSURES_ICH
--..ACCESSORYOR OPtIOnaL HPS_ HfG__RF:SSU_FS_¢H
LIO_]DL]_E SOLE_O]D
[PS I0_ P_SS_RE S_J_CH
Fig. 16 - Wiring Schematic-50DT Single Phase
A06280
14

MOTOR TURNS SLOWLY
1. Low static pressure loading of blower while access panel is
removed will cause blower to run slowly. Particularly at low
airflow requests. This is normal, do not assume a fault exists.
2. Recheck airflow and system static pressure using UI service
screens with access panel in place.
NOTE: Blower motor faults will not cause a lockout of blower
operation. The fan coil control will attempt to run the blower motor
as long as UI maintains a demand for airflow. The control will not
operate electric heaters while a fault condition exists. The control
communicates with the motor at least once every five seconds, even
when the motor is idle. If, during operation, the control does not
communicate with the motor for more than 25 seconds, the motor
will shut itself down and wait for communications to be
reestablished.
D. Using Fan Coil Control Motor LED in Troubleshooting
The MOTOR LED is connected to the blower motor
communication line and works with tire fan coil control
microprocessor and the STATUS LED to provide unit operation and
troubleshooting information. When the motor is commanded to
operate, the MOTOR LED will be turned on and will flash each time
instructions are sent to the motor. When the motor is commanded to
stop, the MOTOR LED will be turned off.
If the MOTOR LED is lit, flashing, and the motor is running, or if
the MOTOR LED is off and the motor is stopped, operation is
normal and no motor fault exists.
If the MOTOR LED is lit. flashing, and the motor does not run, or
if the MOTOR LED is off and the motor is running, check the
STATUS LED for the Status Code. Refer to the troubleshooting
instructions for the indicated Status Code in Section E, Fan Coil
Control Troubleshooting.
E. Fan ('oil Control Troubleshooting
Fan coil control faults indicated by flashing codes on the amber
system STATUS LED can be resolved using troubleshooting
information provided below. Codes are listed in order of their
priority, highest to lowest. Though multiple faults can exist at any
time, only the highest priority code will be displayed on STATUS
LED. Clearing the indicated fault when multiple faults exist will
cause the next highest priority Status Code to be flashed. All
existing faults, as well as a fault history, can be viewed at UI.
STATUS CODE 45, CONTROL BOARD TEST FAULT
Fan coil control has failed internal start-up tests and must be
replaced. No other service procedure will correct.
STATUS CODE 37. HEATER OUTPUT SENSED "ON" WHEN
NOT ENERGIZED:
Fan coil control is provided with circuitry to detect presence of a
24-vac signal on electric heater stage 1 and stage 2 outputs.
If fan coil control detects a 24-vac signal on either heater stage
output and it is not supplying signal. Status Code 37 will be
displayed on STATUS LED. Control will turn off output and
command blower motor to supply an airflow determined to be safe
for current operation mode with electric heaters energized.
To find the fault:
1. Stop all system operations at UI and check heater stage
24-vac outputs.
2. Disconnect electric heater at power and check heater wiring
for faults. See Status Code 36 for more information.
STATUS CODE 44, MOTOR COMMUNICATION FAULT
When motor is commanded to operate, the MOTOR LED will be
turned on and will flash each time instructions are sent to the motor.
15
When the motor is commanded to stop, the MOTOR LED will be
turned off. The MOTOR LED will not flash to indicate
communications when it is turned off.
Fan coil control is constantly communicating with the motor, even
when the motor and MOTOR LED are off. If motor does not
acknowledge receipt of communications, the fan coil control will
display Status Code 44 on STATUS LED and continue to try to
communicate with the motor. If motor acknowledges
communication, status code will be cleared.
If MOTOR LED is lit and flashing and motor does not run:
1. Check the STATUS LED. If STATUS LED is indicating a
Status 44 code, check the motor wiring harness for proper
connection to control and motor receptacles.
2. Check motor wiring harness to be sure all wiring complies
with wiring diagram description, makes a complete circuit
from connector to connector, and is not shorted.
3. Check 12-vdc low voltage supply m motor at pins I (+) and
2 (-) of motor header connection to fan coil control.
If all checks are normal, fan coil control is good and control module
on motor may need replacement. Check motor and Motor Control
Module following the instructions in Section C, Indoor Fan Motor
Troubleshooting.
If the MOTOR LED is off, STATUS LED is indicating a Status
Code 44 and motor is running:
1. Disconnectthemotorharnessatthe fancoil control. Ifmotor
continues to run, fan coil control is good and control module
on motor may need replacement.
STATUS CODE 25. INVALID MOTOR /MODEL SELECTION
On initial start-up, the fan coil control shall poll motor for its size
data and check unit size data stored in the control memory.
1. If motor size is incorrect for unit size or size data is invalid.
Status Code 25 will be displayed on STATUS LED.
2. If model size data is missing (as is the case when a
replacement fan coil control board is installed), system UI
will prompt installer to enter correct model size from a list of
valid sizes.
3. If motor size is incorrect for model size. motor must be
replaced with proper size motor. Fan coil control will not
respond to operation requests until this fault condition is
resolved.
STATUS CODE 26, INVALID HEATER SIZE
On initial power-up, fan coil control will write into memory electric
heater size as read from heater if heater is provided with Identifier
Resistor (IDR). Heater size must be valid for the installed unit. Fan
coil control will read IDR value connected to pins 1 and 2 of heater
harness connector. If no resistor is found, system UI will prompt
installer to veri_, that no heater is installed. Verifying that this is
correct will establish that the unit is operating without an electric
heater accessory. Upon choosing negative option, installer will be
prompted to select heater size installed from a list of valid heater
sizes for unit size installed.
If heater ID resistor value read is invalid, Status Code 26 will be
displayed on STATUS LED.
If heater installed is equipped with a resistor connected to pins 1 and
2 of heater harness connector and status code 26 is displayed on
STATUS LED:
1. Check wiring harness connections to be sure connections are
secure.
2. If symptoms persist, disconnect wiring harness at fan coil
control board and check for a resistance value greater than
5000 ohms.
3. Check for proper wiring of resistor assembly.

4.Makesureheatersizeinstalledisanapprovedsizeforunit
andsizeinstalled.
NOTE: Fan coil control will not operate electric heater until this
Status Code is resolved. If the heater size is set through the UI, the
heater will be operated as asingle stage heater. If staging is desired,
the IDR value must be read in by the unit control.
STATUS CODE 36, HEATER OUTPUT NOT SENSED WHEN
ENERGIZED
Fan coil control is provided with circuitry to detect presence of a
24-vac signal on electric heater stage 1 and stage 2 outputs.
If fan coil control energizes either heater stage and does not detect
the 24-vac signal on output, Status Code 36 will be displayed on the
STATUS LED, control will continue m energize heater output(s)
and adjust blower operation to a safe airflow level for energized
electric heat stage(s).
To find the fault:
1. Check for 24-vac on heater stage outputs. Fan coil control
or sensing circuit may be bad.
NOTE: It may be useful as an electric heater troubleshooting
procedure to disconnect the system communications to force Status
Code 16 enabling of emergency heat mode. It is difficult to know
which heater output is energized or not energized in normal
operation. When unit is operated in emergency heat mode using
electric heaters, both outputs are energized and de-energized
together. Terminal strip inputs to fan coil control can then be
connected R to W to turn on both electric heat outputs. Heater output
sensing circuits can then be checked to resolve Status Code 36 or 37
problems.
STATUS CODE 41, BLOWER MOTOR FAULT
If MOTOR LED is lit and flashing and motor does not run:
1. Check STATUS LED. If STATUS LED is indicating Status
Code 41. motor control has detected that the motor will not
come up to speed within 30 seconds of being commanded to
run or that the motor has been slowed to below 250 rpm for
more than 10 seconds after coming up to speed. Motor
wiring harness and fan coil control are operating properly,
do not replace.
2. Check to be sure that the blower wheel is not rubbing the
housing.
3. Check motor to be sure that the motor shaft is not seized
(motor control module must be removed and electronics
disconnected from windings to perform this check
properly).
4. Check motor windings section following instructions in
Section C. Indoor Fan Motor Troubleshooting.
If all these checks are normal, the motor control module may need
replacement.
STATUS CODE 16, SYSTEM COMMUNICATION FAULT
If, at any time, system communications are not successful for a
period exceeding 2 minutes, the fan coil control will only allow
emergency heating or cooling operation using a common
thermostat, and the terminal strip connections and will display
Status code 16 on the amber STATUS LED (see
Non-Communicating Emergency Cooling/Heating Mode). No
further unit troubleshooting information will be available at the UI
until communications are re-established.
Check system wiring to be sure the UI is powered and connections
are made A to A, B to B, etc.. and wiring is not shorted. Mis-wiring
or shorting of the ABCD communications wiring will not allow
successful communications. Correcting wiring faults will clear the
code and re-establish communications.
Shorting or mis-wiring the low voltage system wiring will not cause
damage to unit control or to UI but may cause the low voltage fuse
to open.
STATUS CODE 46. BROWNOUT CONDITION
If the secondary voltage of the transformer falls below 15-vac for
a period exceeding 4 seconds, Status Code 46 will be displayed on
STATUS LED and the UI will command the control board to turn
off compressor.
When secondary voltage rises above 17-vac for more than 4
seconds, the brownout condition is cleared and normal system
operation will resume subject to any minimum compressor
off-delay function which may be in effect. Brownout does not affect
blower or electric heater operation.
STATUS CODE 53, OUTDOOR AIR TEMPERATURE SENSOR
FAULT
If an OAT sensor is found at power-up, input is constantly checked
to be within a valid temperature range. If sensor is found to be open
or shorted at any time after initial validation, Status Code 53 will be
displayed at amber STATUS LED.
Check for faults in wiring connecting sensor to OAT terminals.
Using an Ohm meter, check resistance of thermistor for a short or
open condition.
If thermistor is shorted or open, replace it to return the system to
normal operation. If fault is in the wiring connections, correcting the
fault will clear the code and return the system to normal operation.
NOTE: If fault condition is an open thermistor or a wiring problem
that appears to be an open thermistor and the power to the unit is
cycled off, the fault code will be cleared on the next power-up but
the fault will remain and system operation will not be as expected.
This is because on power- up, the unit control cannot discern the
difference between an open sensor or ifa sensor is not installed.
F. HP/AC Control Troubleshooting
See Table 3 for HP/AC control board status codes and
troubleshooting information.
Step 2--Sequence of Operation
The 50DT packaged heat pump is designed for installation with a
communicating UI. This unit will not respond to commands
provided by a common thermostat except under certain emergency
situations described in Step 1--Start-Up.
The UI uses temperature, humidity and other data supplied from
indoor and outdoor system components to control heating or
cooling system for optimum comfort. The unit will be commanded
by UI to supply airflow. The unit will operate the indoor fan at
requested airflow for most modes.
The nominal requested airflow will be 350 cfm per ton of nominal
cooling capacity as defined by unit size. Actual airflow request will
be adjusted from nominal using indoor and outdoor temperature
and indoor humidity data to optimize the system operation for
occupant comfort and system efficiency. Refer to UI literature for
further system control details.
Airflow during electric heater operation must be greater than a
minimum level for safe operation. If UI instructs unit to turn on
electric heat and the requested airflow is less than the minimum level
the fan coil control will override requested value.
NOTE: Once the compressor has started and then has stopped, it
should not be started again until 4 minutes have elapsed. The
cooling cycle remains "on" until the room temperature drops to
point that is slightly below the cooling control setting of the UI.
16

Table3--HEAT PUMP/AIR CONDITIONER BOARD STATUS CODES
AMBER
LED
OPERATION FAULT POSSIBLE CAUSE AND ACTION
FLASH
CODE
Standby no call for unit opera- On solid,
tion None no flash Normal operation.
Standard Ther- Rapid, con- Unit being controlled by standard thermostat inputs instead of Infin-
Emergency Mode mostat Control tinuous ity Control. Onty high stage operation is available. This operating
flashing mode should be used in emergency situations only.
Low Stage Cool/Heat Operation None 1, pause Normal operation.
High Stage Coot/Heat Opera-
tion None 2, pause Normal operation.
System Commu- 16 Communication with UI lost. Check wiring to UI, indoor and outdoor
nications Failure units.
Invalid Model 25 Control does not detect a model ptug or detects an invalid model
Plug plug. Unit will not operate without correct model plug.
High-Pressure 31 High-pressure switch trip. Check refrigerant charge, outdoor fan
Switch Open operation and coils for airflow restrictions.
Low-Pressure 32 Low-pressure switch trip. Check refrigerant charge and indoor air
Switch Open flow.
Outdoor unit control board has failed. Control board needs to be
Control Fault 45 replaced.
Brown Out 46 Line voltage < 187v for at least 4 seconds. Compressor and fan
(230 v) operation not allowed until voItage>190v. Verify line voltage.
There is no 230v at the contactor when indoor unit is powered and
No 230v at Unit 47 cooling/heating demand exists. Verify the disconnect is closed and
230v wiring is connected to the unit.
Outdoor Air Outdoor air sensor not reading or out of range. Ohm out sensor
Temp Sensor 53 and check wiring.
Fault
Outdoor Coil 55 Coii sensor not reading or out of range. Ohm out sensor and check
Sensor Fault wiring.
Thermistors Out 56 Improper relationship between coit sensor and outdoor air sensor.
of Range Ohm out sensors and check wiring.
Compressor voltage sensed, then disappears while cooling or heat-
Low Stage Ther-
mal Cutout 71 ing demand exists. Possible causes are internal compressor over-
Ioad trip or start relay not releasing (if installed).
Compressor voltage sensed, then disappears while cooling or heat-
High Stage Ther-
mal Cutout 72 ing demand exists. Possible causes are internal compressor over-
Ioad trip or start relay not releasing (if installed).
Contactor Compressor voltage sensed when no demand for compressor op-
73 eration exists. Contactor may be stuck closed or there is a wiring
Shorted error.
No 230V at 74 Compressor voltage not sensed when compressor should be start-
Compressor ing. Contactor may be stuck open or there is a wiring error.
Low Stage Ther- 81 Thermal cutout occurs in three consecutive low/high stage cycles.
mal Lockout Low stage locked out for 4 hours or untii 24v power recycled.
High Stage Ther- 82 Thermal cutout occurs in three consecutive high/tow stage cycles.
mal Lockout High stage locked out for 4 hours or until 24v power recycled.
Low-Pressure Low-pressure switch trip has occurred during 3 consecutive
83 cycles. Unit operation locked out for 4 hours or untii 24v power
Lockout recycled.
High-pressure switch trip has occurred during 3 consecutive
High- Pressure
Lockout 84 cycles. Unit operation locked out for 4 hours or untii 24v power
recycled.
COOLING AND HEATING OPERATION
With a call for first stage cooling, the outdoor fan, reversing
valve, and low stage compressor are energized. If low-stage
cannot satisfy cooling demand, high-stage cooling is energized
by the UI. After second stage is satisfied, the unit returns to
low-stage operation until first stage is satisfied or until second
stage is required again. When both first stage and second stage
cooling are satisfied, the compressor will shut off. The reversing
valve will remain energized until the control board power is
removed or a call for heating in initiated. 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 heating demand is satisfied, the
compressor and fan will shut off. The reversing valve is
de-energized in the heating mode.
NOTE: When two-stage unit is operating at low-stage, system
vapor (suction) pressure will be higher than a standard
single-stage system or high-stage operation.
NOTE: Outdoor fan motor will continue to operate for one
minute after compressor shuts off. when outdoor ambient is
greater than or equal to 100°F.
UTILITY INTERFACE WITH INFINITY CONTROL
The utility curtailment relay should be connected to factory
supplied pigtails (PINK. connected to R, VIOLET connected to
Y2 on the control board) located in the low voltage splice box
17

(SeeFig.13,15and16).Thisinputallowsapowerutilitydevice
tointerruptcompressoroperationduringpeakloadperiods.
Whentheutilitysendsasignaltoshutthesystemdown,theUI
willdisplay"Curtailment Active".
COMPRESSOR OPERATION
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 at
part load capacity. The 24-volt solenoid coil is de-energized in
low-stage operation.
When the compressor is operating at high stage, the modulating
ring is activated, sealing the bypass ports, which allows the
compressor to operate at full load capacity. The 24-volt solenoid
coil is energized in high stage operation.
CRANKCASE HEATER OPERATION (IF APPLICABLE)
The crankcase heater is energized during off cycle below 65°F
outdoor air temperature.
OUTDOOR FAN MOTOR OPERATION
The outdoor unit control energizes the outdoor fan any time the
compressor is operating, except for defrost. The outdoor fan
remains energized if a pressure switch or compressor overload
should open. Outdoor fan motor will continue to operate for one
minute after the compressor shuts off when the outdoor ambient
is greater than or equal to 100"F.
TIME DELAYS
The unit time delays include:
• Five minute time delay to start cooling or heating
operation when there is a call from the thermostat or
user interface. To bypass this feature, momentarily
short and release Forced Defrost pins.
• Five minute compressor re-cycle delay on return from
a brown-out condition.
• Two minute time delay to return to standby operation
from last valid communication (with Infinity only).
• One minute time delay of outdoor fan at termination of
cooling mode when outdoor ambient is greater than or
equal to 100°F.
• Fifteen second delay at termination of defrost before
the auxiliary heat (Wl) is de-energized.
• Twenty second delay at termination of defrost before
the outdoor fan is energized.
• Thirty second compressor delay when quiet shift
enabled.
• There is no time delay between staging from low to high
and from high to low capacity; the compressor will
change from low to high and from high to low capacity
as demand dictates.
INFINITY CONTROLLED LOW AMBIENT COOLING
NOTE: When this unit is operating below 55°F outdoor
temperature, provisions must be made for low ambient operation.
This unit is capable of low ambient cooling ONLY when using the
Infinity control. A low ambient kit is not required, and the outdoor
fan motor does not need to be replaced for Infinity controlled low
ambient operation. Low ambient cooling must be enabled in the
UI set-up. Fan may not begin to cycle until about 40 o F OAT. Fan
will cycle based on coil and outdoor air temperature. Infinity
controlled low ambient mode operates as follows:
In high stage, fan is off when outdoor coil temp is <outdoor
air temperature +3°F or outdoor fan has been ON for 30
minutes. (Fan is turned off to allow refrigerant system to
stabilize.)
• In low stage, fan is off when outdoor coil temp is <outdoor air
temperature +1 °F or outdoor fan has been ON for 30 minutes.
(Fan is turned off to allow refrigerant system to stabilize.)
• In high stage and low stage, fan is on when outdoor coil temp
> outdoor air temperature +25 °F or outdoor coil temp > 80 oF
or if outdoor fan has been OFF for 30 minutes. (Fan is turned
on to allow refrigerant system to stabilize.)
•Low-pressure switch is ignored for first 3 minutes during low
ambient start up. After 3 minutes, if LPS trips, then outdoor
fan motor is turned off for 10 minutes, with the compressor
running. If LPS closes within 10 minutes then cooling
continues with the outdoor fan cycling per the coil
temperature routine listed above for the remainder of the
cooling cycle. If the LPS does not close within 10 minutes,
then the normal LPS trip response (shut down cooling
operation and generate LPS trip error) will occur.
DEFROST
This control offers 5 possible defrost interval times: 30, 60, 90,
120 minutes, or AUTO.
The defrost interval times: 30, 60, 90, and 120 - minutes or
AUTO are selected by the Infinity Control User Interface (the dip
switches are not used.)
AUTO defrost adjusts the defrost interval time based on the last
defrost time as follows:
• When defrost time <3 minutes, the next defrost
interval= 120 minutes.
• When defrost time 3-5 minutes, the next defrost
interval=90 minutes.
• When defrost time 5-7 minutes, the next defrost
interval=60 minutes.
• When defrost time >7 minutes, the next defrost
interval=30 minutes.
The HP/AC control board accumulates compressor run time. As
the accumulated run time approaches the selected defrost interval
time. the control board monitors the coil temperature sensor for a
defrost demand. If a defrost demand exists, a defrost cycle will be
initiated at the end of the selected time interval. A defrost demand
exists when the coil temperature is at or below 32°F for 4
minutes during the interval.
The defrost cycle is terminated when the coil temperature reaches
65°F or 10 minutes has passed.
If the coil temperature does not reach 32°F within the interval,
the interval timer will be reset and start over.
• Upon initial power up the first defrost interval is
defaulted to 30 minutes. Remaining intervals are at
selected times.
• Defrost is only allowed to occur below 50°F outdoor
ambient temperature.
DEFROST HOLD
Defrost hold is not needed in a communicating system because
the User Interface will complete the defrost cycle before shutting
down the system.
FORCED DEFROST
Forced defrost is initiated with the User Interface.
During a Forced Defrost:
• If coil temperature is at defrost temperature of 32°1,
and outdoor air temperature is below 50°1, a full
defrost sequence will occur.
• If coil temperature or outdoor air temperature do not
meet the above requirements, an abbreviated 30 second
defrost will occur.
18

QUIETSHIFT
QuietShiftis a field-selectabledefrostmodewhichmay
eliminateoccasionalnoisethatcouldbeheardatthestartofthe
defrostcycleandrestartingoftheheatingcycle.Thisfeature
mustbeenabledattheUL Whenactivated,thefollowing
sequenceofoperationwilloccur.Reversingvalvewillenergize
andcompressorwillturnofffor30seconds,thenturnbackonto
completedefrost.Attheendofthedefrostcycle,thereversing
valvede-energizes,compressorwillturnoffforanother30
seconds,andthefanwillturnofffor40seconds,beforestarting
intheheatingmode.
Step3--Check for Refrigerant Leaks
Locate and repair refrigerant leaks and charge tire unit as follows:
1. Use both high- and low-pressure ports to relieve system
pressure and reclaim remaining refrigerant.
2. Repair leak following accepted practices.
NOTE: Install a filter drier whenever the system has been opened
for repair.
3. Check system for leaks using an approved method.
4. Evacuate refrigerant system and reclaim refrigerant if no
additional leaks are found.
5. Charge unit with Puron (R-410A) refrigerant, using a
volumetric-charging cylinder or accurate scale. Refer to unit
rating plate for required charge.
Step 4--Start-Up Adjustments
Complete tire required procedures given in the Pre-Start-Up
section before starting the unit. Do not jumper any safety devices
when operating the unit. Do not operate the unit in cooling mode
when the outdoor temperature is below 40°F (unless low-ambient
operation is enabled in the UI). Do not rapid cycle the compressor.
Allow 5 min. between "on" cycles to prevent compressor damage.
CHECKING COOLING AND HEATING CONTROL
OPERATION
See UI Installation Instructions for detailed system CHECKOUT.
CHECKING AND ADJUSTING REFRIGERANT CHARGE
The refrigerant system is fully charged with Puron (R-410A)
refrigerant and is tested and factory sealed.
NOTE: Any adjustment to refrigerant charge must be done with
unit operating in HIGH stage.
NOTE: Adjustment of the refrigerant charge is not required unless
the unit is suspected of not having the proper R-410A charge. The
charging label and the tables shown refer to system temperatures and
pressures in cooling mode only. A refrigerant charging label is
attached to the outside of the unit. If charge level is suspect in heating
mode, reclaim all refrigerant and charge to rating plate amount.
(This information may be obtained from the physical data table
also.)
IMPORTANT: When evaluating the refrigerant charge, an
indicated adjustment to the specified factory charge must always be
very minimal. If a substantial adjustment is indicated, an abnormal
condition exists somewhere in the cooling system, such as
insufficient airflow across either coil or both coils.
REFRIGERANT CHARGE
The amount of refrigerant charge is listed on the unit rating plate
and/or the physical data table. Refer to the Refrigeration Service
Techniques Manual, Refrigerants Section.
NO CHARGE
Check for leak. Use standard evacuating techniques. After
evacuating system, weigh in the specified amount of refrigerant
(refer to system rating plate).
LOW CHARGE COOLING
Use Cooling Charging Chart (Fig. 18). Vary refrigerant until the
conditions of the chart are met. Note that charging charts are
different from type normally used. Charts are based on charging the
units to correct subcooling for the various operating conditions.
Accurate pressure gauge and temperature sensing devices are
required. Connect the pressure gauge to the service port on the
suction line. Mount the temperature sensing device on the suction
line and insulate it so that the outdoor ambient does not affect the
reading. Indoor air CFM must be within the normal operating range
of the unit.
TO USE COOLING CHARGING CHARTS
Take the liquid line temperature and read the manifold pressure
gauges.
Refer to the chart to determine what the liquid line temperature
should be.
NOTE: If the problem causing the inaccurate readings is a
refrigerant leak, refer to Check for Refrigerant Leaks section.
INDOOR AIRFLOW AND AIRFLOW ADJUSTMENTS
NOTE: Be sure that all supply- and return-air grilles are open, free
from obstructions, and adjusted properly.
The 50DT unit utilizes state of the art ECM (Electronic Computated
Motor) ID Blower Motors. See UI instructions for detailed
information on adjusting airflow.
NON-COMMUNICATING EMERGENCY COOLING /
HEATING MODE
This mode of operation is provided only in the case where the UI has
failed or is otherwise unavailable. If communications cannot be
established with the UI, the Infinity fan coil board will enable the R,
C. Y. O, and W input terminals to allow simple thermostatic control
of the 50DT unit.
For control with a standard thermostat, disconnect the ABCD
connectors from both control boards and using No. 18 AWG
color-coded, insulated type 90°C minimum or equivalent wire.
make the connections between the standard thermostat, the fan coil
board, and the HP/AC board per Fig. 17. Recommend the use of
interconnecting wire with 105C, 600V, 2/64" insulation.
The Infinity control will respond to cooling and heating demands
with the maximum safe airflow based on electric heat size (if
applicable) and unit capacity.
19

mnfinityFanCoi[ infinityHP/AC
Board Board
Standard
Thermostat OAT
OCT
O
Y2
Y1
Wl
C
R
Outdoor Air Thermistor
(Supplied with Ul)
FIELD CONNECTION
REQUIRED
(BLACK WIRES)
OutdoorCoilThermistor
FACTORYCONNECTED
Fig. 17 - Non-Communicating Emergency Cooling/Heating Wiring Connections
A06297
Required Subcooling °F (°C)
'Outdoor Ambien_ Terr _erature
,_od_lS_ze75/24) 62199/ 95/65_ 19514_}
024 155(86) 156(87) 158(88} 159(89)
030 168(93) 164(91 ) 162{9) I56{87) 15(83)
039 I14(77) 139(77) 139(77) 138(77) 137(79_
042 1192(I07) 191(106 191(106) 189(105) 187(104/
048 21(116/ 209(115 207{115) 204(113) 202(112/
060 162(9) 166(92) 169(93) 173(96) 178(99)
Char_Procedure
/ Meas_ re Discha ge line p_ess_ re by attaching agauge tothe sewce _)ort
2 Measure the Liquid _ne temperature by attachm_ a tempe_at_re sensing device _o _t
3 h_st_a_e _he temperature sensing device so tha_ the Outdoo_ A_l_b_e_t doesn t affect the read_n_
4 Refe_ to the requi_ed Su_coo_i_g in the table based o_ _he mode_ size and the Outdoor Ambien_
temperature
5 Interpolate ifthe O_tdoor temperat_re I_es _n_etween _he table vak_es Extrapolate _fthe
temperature _;es beyond the table ravage
6 F_n_ the Pressure Va_ue correspondi_g to the the measured Plessure o_ the Com_l essor
D_scharge _i_e
7 Read across from the P_essure readh/_ to obtain the Liquid li_e tem_e_at_re fo_a _equired
Subcoo_f_g
8 A_d Chalge ifthe measured temperature is higher than _he I_qLl_dI_e temperature vakle _nthe
table
9 A_d Chalge LIS_g the se_ce connection on the Suction I_ne of _he Complessor
Required Liquid L{ne Temperature for a Specific Subcoolir_g {R-410A}
Re uired Subcoofi% !°F Re _ired Subcooling (°C}
Fressure Pressure
{Psig} 5 10 15 25 (kPal 3 6 8 14
174 56 51 46 36
181 59 54 49 39
188 61 56 51 41
195 63 58 53 43
202 65 60 55 45
209 67 62 57 47
216 69 64 59 49
223 71 66 61 51
189 61 56 51 41
196 53 58 53 43
203 66 61 56 46
210 68 63 58 48
217 70 65 60 50
224 72 57 62 52
231 74 69 64 54
238 76 71 56 56
245 77 72 67 57
252 79 74 69 59
260 81 76 71 61
268 83 79 73 63
276 85 80 75 65
284 87 82 77 67
1200 13 11 8 2
1248 15 12 9 4
1296 16 13 10 5
1344 I7 14 12 6
1393 I8 16 13 7
1441 20 17 14 9
1489 21 18 15 10
1537 22 19 16 11
1303 16 13 11 5
1351 17 15 12 6
1399 19 16 13 8
1448 20 17 14 9
1496 21 18 15 10
1544 22 19 16 11
1593 23 20 18 12
1641 24 21 19 13
1689 25 22 20 14
1737 26 23 21 15
1792 27 25 22 16
1849 29 26 23 17
1903 30 27 24 19
1958 31 28 25 20
292 89 84 79 59
300 91 86 81 71
309 93 88 83 73
318 95 90 85 75
327 97 92 87 77
336 99 94 89 79
345 I01 96 91 81
354 I03 98 93 83
364 I05 100 95 85
374 I07 102 97 87
384 I08 103 98 88
394 I10 105 I00 90
404 112 I07 102 92
414 114 109 104 94
116 Ill 106 96
116 I13 108 98
119 I14 109 99
121 116 111 101
464 123 I18 113 I03
474 124 I19 114 I04
484 126 I21 116 I06
494 127 I22 117 I07
904 I29 124 I19 109
914 I31 126 I21 111
524 I32 127 I22 112
934 134 129 124 114
2013 32 29 26 21
2068 33 30 27 22
2130 34 31 28 23
2192 35 32 29 24
2254 36 33 31 25
2316 37 34 32 26
2378 38 35 33 27
2440 39 36 34 28
2509 40 38 35 29
2578 41 39 36 30
2647 42 40 37 31
2716 44 41 38 32
2785 45 42 39 33
2854 46 43 40 34
2923 47 44 41 35
2992 48 45 42 36
3061 48 46 43 37
3130 49 47 44 39
3199 50 48 45 39
3268 51 48 46 40
3337 52 49 47 41
3406 53 50 47 42
3475 64 51 48 43
3544 65 52 49 44
3612 56 53 50 45
3681 56 54 51 45
Fig. 18 - Cooling Charging Table-Subcooling
A06315
2O