nvent T43 User manual

© 2018 nVent 89056284
Rev. I P/N 10-1008-145
T-SERIES
Air Conditioner
t43 Model
INSTRUCTION MANUAL

© 2018 nVent 89056284
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IMPORTANT NOTICE
• These instructions were authored in English. Instructions published in languages other than English have been
translated from the authored language.
• These air conditioners are intended to be used by properly trained customers in industrial, communications and
agricultural environments.
• Operating sound level is below 70 dBA.
Disconnect the power source from
the air conditioner before servicing.
WARNING
TABLE OF CONTENTS
Warranty and Return Policy.............................................................................................................................................................2
IMPORTANT NOTICE .......................................................................................................................................................................2
RECEIVING THE AIR CONDITIONER...............................................................................................................................................3
HANDLING AND TESTING THE AIR CONDITIONER......................................................................................................................3
INSTALLATION INSTRUCTIONS .....................................................................................................................................................4
Design Data.....................................................................................................................................................................................................4
DIMENSIONAL DRAWINGS .............................................................................................................................................................4
MOUNTING CUTOUT DIMENSIONS ...............................................................................................................................................5
MOUNTING GASKET KIT.................................................................................................................................................................6
Components List ............................................................................................................................................................................................7
Wiring Diagram and Schematic ......................................................................................................................................................8
Generic Wire Diagram (actual unit options may vary) .........................................................................................................................8
Generic Schematic For 1-Phase Models (actual unit options may vary)...........................................................................................9
Generic Wire Diagram For 3-Phase Models (actual unit options may vary)......................................................................................9
TEMPERATURE CONTROL ........................................................................................................................................................... 10
Units With Heat .............................................................................................................................................................................................10
PRINCIPLES OF OPERATION ....................................................................................................................................................... 10
MAINTENANCE............................................................................................................................................................................. 10
Compressor...................................................................................................................................................................................................10
Inlet Air Filter .................................................................................................................................................................................................10
How To Remove, Clean or Install a New Inlet Air Filter .............................................................................................................................11
Condenser and Evaporator Air Movers.......................................................................................................................................................11
Refrigerant Loss............................................................................................................................................................................................11
TROUBLE SHOOTING ................................................................................................................................................................... 12
Basic Air Conditioning Trouble Shooting Check List.................................................................................................................................12
Symptoms and Possible Causes:................................................................................................................................................................13
NOTE: Some of the information in this manual may not apply if a special unit was ordered. If
additional drawings for a special unit are necessary, they have been inserted. Contact nVent
Equipment Protection if further information is required.
WARRANTY AND RETURN POLICY
https://hoffman.nvent.com/en/hoffman/warranty-information

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RECEIVING THE AIR CONDITIONER
Inspect the air conditioner. Check for concealed damage that may have occurred during shipment. Look for dents,
scratches, loose assemblies, evidence of oil, etc. Damage evident upon receipt should be noted on the freight bill.
Damage should be brought to the attention of the delivering carrier -- NOT to nVent Equipment Protection -- within
15 days of delivery. Save the carton and packing material and request an inspection. Then le a claim with the
delivering carrier.
nVent Equipment Protection cannot accept responsibility for freight damages; however, we will assist you in any
way possible.
HANDLING AND TESTING THE AIR CONDITIONER
If the air conditioner has been in a horizontal position, be certain it is placed in an upright, vertical or mounting
position for a minimum of ve (5) minutes before operating.
Do not attempt to operate the air conditioner while it is horizontal
or on its side, back or front. The refrigeration compressor is lled
with lubricating oil. This will cause permanent damage to the air
conditioner and also voids the warranty.
CAUTION
TEST FOR FUNCTIONALITY BEFORE MOUNTING THE AIR CONDITIONER TO THE ENCLOSURE.
Refer to the nameplate for proper electrical current requirements, and then connect the power cord to a properly
grounded power supply. Minimum circuit ampacity should be at least 125% of the amperage shown in the
design data section for the appropriate model. No other equipment should be connected to this circuit to prevent
overloading.
Operate the air conditioner for ve (5) to ten (10) minutes. No excessive noise or vibration should be evident
during this run period. The condenser blower (ambient air), the evaporator impeller (enclosure air), and the
compressor should be running.
Condenser air temperatures should be warmer than normal room temperatures within a few minutes. The
compressor is provided with automatic reset thermal overload protection. This thermoswitch is located and
mounted inside the plastic enclosure clipped to the compressor. The switch operates when the compressor
overheats due to clogged or dirty inlet air lter or if ambient air temperatures exceed nameplate rating or if
enclosure dissipated heat loads exceed the rated capacity of the air conditioner. The thermal overload switch
will actuate and stop compressor operation. The blowers will continue to operate and the compressor will restart
after it has cooled to within the thermal overload cut-in temperature setting.

© 2018 nVent 89056284
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INSTALLATION INSTRUCTIONS
1. Inspect the air conditioner and verify correct functionality before mounting the air conditioner. See
HANDLING AND TESTING THE AIR CONDITIONER on page 3.
2. Using the cutout dimensions, See MOUNTING CUTOUT DIMENSIONS on page 5 in this manual,
prepare the air “IN” and air “OUT” openings, and mounting bolt hole pattern for the enclosure.
3. Using the gasket kit provided, install gaskets to air conditioner. See MOUNTING GASKET KIT on
page 6 for proper location.
4. Mount air conditioner on enclosure using mounting bolts and screws provided. “EZ” mount tabs
can be used to hold unit on enclosure while mounting in place. Allow unit to remain upright for a
minimum of ve (5) minutes before starting. Caution! Air conditioner must be in upright position
during operation.
5. When routing the drain tube, caution should be taken to keep it from kinking or being elevated
above the exit point of the air conditioner. The drain tube must be on a continuous downward
slope. A slight elevation of the tube could result in secondary trap. FAILURE TO FOLLOW THESE
INSTRUCTIONS COULD RESULT IN OVERFLOWING OF THE CONDENSATE DRAIN PAN.
6. Refer to top of nameplate for electrical requirements. Connect the power cord to a properly
grounded power supply. Use of an extension cord is not recommended. Electrical circuit should be
fused with slow blow or HACR circuit breaker.
DESIGN DATA
Model Voltage Hz Full Load
Amps Phase BTU/Hr @ Max Amb Temp Max Amb Temp °F/°C Shipping Weight lb./kg
T430616GXXX 115 50/60 8.6 16310/6680 131/55 125/57
T430626GXXX 230 50/60 3.8 16520/6770 131/55 125/57
T430816GXXX 115 50/60 10.4/11.2 17900/8600 131/55 125/57
T430826GXXX 230 50/60 5.2/5.4 17400/8200 131/55 125/57
T431016GXXX 115 50/60 16/20 19670/10290 131/55 125/57
T431026GXXX 230 50/60 9.0 110040/10670 131/55 125/57
T431046G4XX 400/460 50/60 3.4/3.0 310100/10500 131/55 140/64
XXX will be replaced with a three-digit number designating all desired options. Consult the factory for specic model numbers.
DIMENSIONAL DRAWINGS
6K BTU

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8-10K BTU
MOUNTING CUTOUT DIMENSIONS
External Cutout Internal Cutout

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MOUNTING GASKET KIT

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COMPONENTS LIST
Part Description Part Number (115 Volt)
6000 BTU 8000 BTU 10000 BTU
Capacitor, Compressor, Start 10-1032-05 10-1032-08 10-1032-32
Capacitor, Compressor, Run S-6173 52-6032-01 52-6032-06
Capacitor, Impeller, Condenser 52-6084-01 52-6084-01 52-6031-03
Capacitor, Impeller, Evaporator 52-6084-01 52-6084-01 52-6084-01
Coil, Condenser 45-6051-00 45-6051-00 45-6051-00
Coil, Evaporator 43-6025-00 43-6025-00 43-6025-00
Compressor, RKA 10-1016-86 10-1016-85 10-1016-88
Filter, Air, Reusable 89057617 89057617 89057617
Filter/Dryer 52-6028-00 52-6028-00 52-6028-00
Freeze Stat 10-1033-29 10-1033-29 10-1033-29
Head Pressure Control Switch 52-6104-26 52-6104-26 52-6104-26
Impeller, Condenser 10-1091-123 10-1091-123 10-1091-89
Impeller, Evaporator 10-1091-123 10-1091-123 10-1091-123
Relay, Compressor Start 10-1042-20 10-1042-07 10-1042-17
Service Cord 52-6035-143 52-6035-143 52-6035-85
Thermal Expansion Valve 99-0540-39 (cap tube) 10-1040-37 10-1040-38
Thermal Overload, Compressor TTC=8300MRAL19 OR
TI=MRA4761-114 TTC=8300MRAL22 OR TI=MRA4760-114 Internal
Thermostat, SPST, 55-100F 10-1061-16 10-1061-16 10-1061-16
Part Description Part Number (230 Volt) 460V 3-Phase
6000 BTU 8000 BTU 10000 BTU 10000 BTU
Capacitor, CompressNor, Start 10-1032-14 10-1032-08 10-1032-08 N/A
Capacitor, Compressor, Run S-6173 S-6173 52-6032-01 N/A
Capacitor, Impeller, Condenser 52-6084-02 52-6084-02 52-6084-05 52-6032-20
Capacitor, Impeller, Evaporator 52-6084-02 52-6084-02 52-6084-02 52-6032-44
Coil, Condenser 45-6051-00 45-6051-00 45-6051-00 45-6051-00
Coil, Evaporator 43-6025-00 45-6050-00 45-6050-00 45-6050-00
Compressor, RKA 10-1026-109 10-1026-108 10-1026-107 10-1024-113
Filter, Air, Reusable 89057617 89057617 89057617 89057617
Filter/Dryer 52-6028-00 52-6028-00 52-6028-00 52-6028-00
Freeze Stat 10-1033-29 10-1033-29 10-1033-29 87097855
Head Pressure Control Switch 52-6104-26 52-6104-26 52-6104-26 52-6104-26
Impeller, Condenser 10-1091-124 10-1091-124 10-1091-90 10-1091-90
Impeller, Evaporator 10-1091-124 10-1091-124 10-1091-124 10-1091-124
Relay, Compressor Start 10-1042-21 10-1042-08 10-1042-17 N/A
Service Cord 52-6035-32 52-6035-32 52-6035-32 N/A
Thermal Expansion Valve 99-0540-39 (cap tube) 10-1040-37 10-1040-38 10-1040-31
Thermal Overload, Compressor TTC=8300MRAL20 OR
TI=MRA4765-114
TTC=8300MRAL23
OR
TI=MRA1706-114
TTC=8300MRAL30
OR
TI=MRA4764-114 10-1007-79
Thermostat, SPST, 55-100F 10-1061-16 10-1061-16 10-1061-16 10-1061-16
Relay, Phase Monitor N/A N/A N/A 87097986
Relay, Overload N/A N/A N/A 87078326
Contactor, 3-Pole N/A N/A N/A 89102057
Relay, 24 VAC N/A N/A N/A 10-1005-36

© 2018 nVent 89056284
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WIRING DIAGRAM AND SCHEMATIC
GENERIC WIRE DIAGRAM (ACTUAL UNIT OPTIONS MAY VARY)
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© 2018 nVent
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GENERIC SCHEMATIC FOR 1-PHASE MODELS (ACTUAL UNIT OPTIONS MAY VARY)
GENERIC WIRE DIAGRAM FOR 3-PHASE MODELS (ACTUAL UNIT OPTIONS MAY VARY)

© 2018 nVent 89056284
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TEMPERATURE CONTROL
The electromechanical thermostat is factory preset to 75 F/24 C. To change the temperature setting, remove the
nylon plug (if applicable) from the back face of the unit. Use a standard screwdriver to adjust thermostat. For cooler
temperatures turn clockwise, for warmer temperatures turn counterclockwise. The set point of the thermostat equals
the off temperature. The on temperature is 10 F/5 C above the set point.
UNITS WITH HEAT
The heating thermostat is factory preset to 55 F/13 C. The set point for the heating thermostat equals the on
temperature. The off temperature is 10 F/5 C above the set point.
PRINCIPLES OF OPERATION
If electrical power to the air conditioner is interrupted and reapplied immediately, (within 3 to 5 seconds), the compressor
may not restart due to the high back pressure of the compressor. It takes a minimum of one (1) minute after shut-down
for the compressor suction and discharge pressures to equalize in order for the air conditioner to restart.
Operating the air conditioner below the minimum ambient temperature or above the maximum ambient temperatures
indicated on the nameplate voids all warranties.
It is recommended that the warranty section of this manual be read in order to familiarize yourself with parameters of
restricted operation.
The moisture that the enclosure air can contain is limited. If moisture ows from the drain tube continuously this can
only mean that ambient air is entering the enclosure. Be aware that frequent opening of the enclosure’s door admits
humid air, which the air conditioner must then dehumidify.
MAINTENANCE
COMPRESSOR
The compressor requires no maintenance. It is hermetically sealed, properly lubricated at the factory and should
provide years of satisfactory operating service.
Should the refrigerant charge be lost, recharging ports (access ttings) on the suction and discharge sides of the
compressor are provided for recharging and/or checking suction and discharge pressures.
Under no circumstances should the access tting covers be loosened, removed or tampered with.
Breaking of seals on compressor access ttings during warranty period will void warranty on hermetic system.
Recharging ports are provided for the ease and convenience of reputable refrigeration repair service personnel for
recharging the air conditioner.
INLET AIR FILTER
Proper maintenance of the inlet air lter, located behind the front cover, will assure normal operation of the air
conditioner. If lter maintenance is delayed or ignored, the maximum ambient temperatures under which the unit is
designed to operate will be decreased.
If the compressor’s operating temperature increases above designed conditions due to a dirty or clogged lter (or
plugged condenser coil), the air conditioner’s compressor will stop operating due to actuation of the thermal overload
cut-out switch located on the compressor housing. As soon as the compressor temperature has dropped to within
the switch’s cut-in setting, the compressor will restart automatically. However the above condition will continue to
take place until the lter or coil has been cleaned. It is recommended that power to the air conditioner be interrupted
intentionally when abnormally high compressor operating temperature causes automatic shut-down of the unit. The
above described shut-down is symptomatic of a clogged or dirty lter, thus causing a reduction in cooling air ow
across the surface of the compressor and condenser coil.
Do not run the air conditioner for extended periods of time with the lter removed. Particles of dust, lint, etc., can plug
the ns of the condenser coil which will give the same reaction as a plugged lter. The condenser coil is not visible
through the lter opening, so protect it with a lter.
Continued operation under the above conditions can and will damage and shorten compressor life. The air conditioner
is available with an easily removable inlet lter to facilitate necessary cleaning. There should be no reason to neglect
this necessary maintenance.

© 2018 nVent
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HOW TO REMOVE, CLEAN OR INSTALL A NEW INLET AIR FILTER
RP aluminum washable air lters are designed to provide excellent ltering eciency with a high dust holding
capacity and a minimum amount of resistance to air ow. Because they are constructed entirely of aluminum
they are lightweight and easy to service. Optimum lter performance is maintained by recoating the lters
after washing with RP Super Filter Coat adhesive. To achieve maximum performance from your air handling
equipment, air lters should be cleaned on a regular basis.
The inlet air lter is located behind the lower access cover. To access lter, pull ring protruding from slot in
bottom of front cover, or remove the lower access cover by removing the two screws at the bottom of unit, the
lter is held in the cover, slide lter out. The lter may now be cleaned or new lter installed.
Cleaning Instructions:
1. Flush the lter with warm water from the exhaust side to the intake side. DO NOT USE CAUSTICS.
2. After ushing, allow lter to drain. Placing it with a corner down will assure complete drainage.
3. Recoat the lters with RP Super Filter Coat adhesive. When spraying lter do so from both sides
for maximum concentration of adhesive.
CONDENSER AND EVAPORATOR AIR MOVERS
Impeller motors require no maintenance. All bearings, shafts, etc. are lubricated during manufacturing for the life
of the motor.
If the condenser impeller motor (ambient impeller) should fail, it is not necessary to remove the air conditioner
from the cabinet or enclosure to replace the blower. The condenser blower is mounted on its own bulkhead and is
easily accessible by removing the lower access panel.
Operation of the air conditioner in areas containing airborne
caustics or chemicals can rapidly deteriorate lters, condenser
coils, blowers and motors, etc. Contact nVent Equipment
Protection for special recommendations.
CAUTION
REFRIGERANT LOSS
Each air conditioner is thoroughly tested prior to leaving the factory to insure against refrigeration leaks. Shipping
damage or microscopic leaks not found with sensitive electronic refrigerant leak detection equipment during
manufacture may require repair or recharging of the system. This work should only be performed by qualied
professionals, generally available through a local, reputable air conditioning repair or service company.
Refer to the data on the nameplate which species the type of refrigerant and the charge size in ounces.
Before recharging, make sure there are no leaks and that the system has been properly evacuated into a deep
vacuum.

© 2018 nVent 89056284
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TROUBLE SHOOTING
BASIC AIR CONDITIONING TROUBLE SHOOTING CHECK LIST
1. Check manufacturer’s nameplate located on the unit for correct power supply.
2. Turn on power to the unit. The evaporator (Enclosure or “COLD” air) impeller should come on. Is
there airow?
YES, proceed to step 3.
NO, possible problem:
• Open motor winding
• Stuck impeller motor
• Obstructed wheel
Repair or Replace
defective part
3. Check thermostat setting and adjust thermostat to the lowest setting. This should turn on the
condenser impellers and compressor. Did condenser impellers and compressor come on when
the thermostat was turned on?
YES, proceed to step 4.
NO, possible problem:
• Defective thermostat Replace Part
4. Are both impellers and the compressor running? If not the unit will not cool properly.
5. Check condenser (Ambient or “HOT” air) impellers for airow. Is there airow?
YES, proceed to step 6.
NO, possible problem:
• Defective thermostat
• Open motor winding
• Stuck impeller motor
• Obstructed wheel
Repair or Replace
defective part
6. Carefully check the compressor for operation - motor should cause slight vibration, and the outer
case of the compressor should be warm. Is the compressor showing signs of this?
YES, wait 5 minutes, then proceed to step 7.
NO, possible problem:
• Defective thermostat
• Defective capacitor
• Defective overload
• Defective relay
Repair or Replace
defective part
7. Make sure the coils are clean. Then check evaporator “air in” and “air out” temperatures. If the
temperatures are the same:
• Possible loss of refrigerant
• Possible bad valves in the
compressor
Repair or Replace
defective part
8. To check for a bad thermostat, turn power to the unit off. Remove the control box cover and place
both thermostat wires onto one terminal (replace control box cover for safety). This will pass the
switch in the thermostat. Turn the power on and if both blowers and the compressor come on, the
thermostat needs to be replaced.

© 2018 nVent
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SYMPTOMS AND POSSIBLE CAUSES:
SYMPTOM POSSIBLE CAUSE
Unit won’t cool
Clogged ns on coil(s)
Dirty lter
Impellers not running
Compressor not running
Compressor runs, but has bad valves
Loss of refrigerant
Compressor tries to start but won’t run
Low line voltage at start. Should be +/-10% rated voltage.
Compressor motor stuck
Bad contactor
Bad overload switch
Bad run/start capacitor
Unit blows breakers Undersized breaker/fuse or not time delayed
Short in system
Getting water in enclosure
Drain plugged
Drain tube kinked
Enclosure not sealed (allowing humidity in)
Mounting gasket damaged
For additional technical support (i.e., amp draw, pressures, temperatures), contact nVent
Equipment Protection at 800-896-2665.

© 2018 nVent 89056284
- 14 -
NOTES

© 2018 nVent
89056284 - 15 -
NOTES

© 2018 nVent 89056284
Rev. I P/N 10-1008-145
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