nVent Hoffman T Series User manual

T29 Instruction Manual

© 2019 nVent 89104464
Rev. K P/N 89104464
T-SERIES
Air Conditioner
t29 Model
INSTRUCTION MANUAL

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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
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
TECHNICAL INFORMATION ............................................................................................................................................................4
Design Data .....................................................................................................................................................................................................4
Dimensional Drawing .....................................................................................................................................................................................5
Mounting Cutout Dimensions ........................................................................................................................................................................6
Mounting Gasket Kit .......................................................................................................................................................................................7
Components List ............................................................................................................................................................................................7
Wire Diagrams and Schematics ....................................................................................................................................................................8
Wire Diagram and Schematic, 115 V, Without Heat .............................................................................................................................8
Wire Diagram and Schematic, 115 V, With Heat ..................................................................................................................................9
Wire Diagram and Schematic, 230 V, Without Heat ...........................................................................................................................10
Wire Diagram and Schematic, 230 V, With Heat ................................................................................................................................11
Temperature Control ....................................................................................................................................................................................12
Principles of Operation .................................................................................................................................................................................12
MAINTENANCE ..............................................................................................................................................................................12
Compressor...................................................................................................................................................................................................12
Inlet Air Filter .................................................................................................................................................................................................12
How To Remove, Clean or Install a New Inlet Air Filter .............................................................................................................................13
Condenser and Evaporator Blowers ...........................................................................................................................................................13
Refrigerant Loss............................................................................................................................................................................................13
TROUBLE SHOOTING ....................................................................................................................................................................14
Basic Air Conditioning Trouble Shooting Check List .................................................................................................................................14
Symptoms and Possible Causes: ...............................................................................................................................................................15
F-GAS INFORMATION ....................................................................................................................................................................16
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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 file 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 five (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 filled
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 five (5) to ten (10) minutes. No excessive noise or vibration should be evident
during this run period. The condenser blower (ambient air), the evaporator blower (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 thermo-switch 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 filter 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.
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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 shown 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
7 of this manual 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 five (5) minutes before starting. Caution! Air conditioner must be in upright position
during operation.
5. To avoid cross-threading mounting inserts, start bolts by hand before tightening with a wrench or
ratchet driver.
6. 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
COULD RESULT IN OVERFLOWING OF THE CONDENSATE DRAIN PAN.
7. 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.
TECHNICAL INFORMATION
DESIGN DATA
Model Voltage Hz Full Load
Amps Phase BTU/Hr @ Max Amb
Max Amb
Temp
°F/°C
Shipping
Weight
lb./kg
T290416GXXX 115 50/60 13.0/12.8 1 3600/4000 131/55 107/48.6
T290426GXXX 230 50/60 7.6/7.2 1 3600/4000 131/55 107/48.6
-XXX will be replaced with a three-digit number designating all desired options. Consult the factory for specific model numbers.
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DIMENSIONAL DRAWING
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MOUNTING CUTOUT DIMENSIONS
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MOUNTING GASKET KIT
COMPONENTS LIST
Part Description 115 Volt
4000 BTU
230 Volt
4000 BTU
Blower, Condenser 28-1064-06M 28-1064-05M
Blower, Evaporator 28-1064-06M 28-1064-05M
Capacitor, Compressor, Start N/A 89104096
Coil, Condenser 11-3001-03HE 11-3001-03HE
Coil, Evaporator 28-1001-00 28-1001-00
Compressor , AE/AK 89100365 89104088
Filter, Air, Reusable 89057619 89057619
Filter/Dryer 52-6028-00 52-6028-00
Relay, Compressor, Start N/A 89104095
Service Cord 52-6035-143 52-6035-141
Terminal Block 10-1003-03 10-1003-03
Thermal Overload, Compressor N/A 89112198
Cooling Thermostat, SPST, 55-100F 10-1061-16 10-1061-16
Optional Heating Thermostat 10-1061-16 10-1061-16
Optional Malf Switch 52-6104-42 52-6104-42
Capacitor, Compressor, Run N/A 89104095
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WIRE DIAGRAMS AND SCHEMATICS
WIRE DIAGRAM AND SCHEMATIC, 115 V, WITHOUT HEAT
NOTE: The actual unit options may vary, see unit label.
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WIRE DIAGRAM AND SCHEMATIC, 115 V, WITH HEAT
89101187
NOTE: The actual unit options may vary, see unit label.
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WIRE DIAGRAM AND SCHEMATIC, 230 V, WITHOUT HEAT
NOTE: The actual unit options may vary, see unit label.
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WIRE DIAGRAM AND SCHEMATIC, 230 V, WITH HEAT
NOTE: The actual unit options may vary, see unit label.
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TEMPERATURE CONTROL
The electromechanical thermostat is factory preset to 75 F/23 C for cooling (Top thermostat) and 55 F/13 C for
heating (Bottom thermostat). To change the temperature setting, remove the nylon plug from the back face of
the unit. Use a standard screwdriver to adjust thermostat. For cooler temperatures turn clockwise, for warmer
temperatures turn counterclockwise. Standard units have a factory installed lower limit of 70 F for cooling and a
upper limit of 60 F for heating.
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 shutdown 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 flows 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 fittings) 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 fitting covers be loosened, removed or tampered with.
Breaking of seals on compressor access fittings 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 filter, located behind the front cover, will assure normal operation of the air
conditioner. If filter 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
filter (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 filter 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 shutdown is symptomatic of a clogged or dirty filter, thus
causing a reduction in cooling air flow across the surface of the compressor and condenser coil.
Do not run the air conditioner for extended periods of time with the filter removed. Particles of dust, lint, etc., can
plug the fins of the condenser coil which will give the same reaction as a plugged filter. The condenser coil is not
visible through the filter opening, so protect it with a filter.
Continued operation under the above conditions can and will damage and shorten compressor life. The air
conditioner is available with an easily removable inlet filter to facilitate necessary cleaning. There should be no
reason to neglect this necessary maintenance.
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HOW TO REMOVE, CLEAN OR INSTALL A NEW INLET AIR FILTER
RP aluminum washable air filters are designed to provide excellent filtering efficiency with a high dust holding
capacity and a minimum amount of resistance to air flow. Because they are constructed entirely of aluminum
they are lightweight and easy to service. To achieve maximum performance from your air handling equipment, air
filters should be cleaned on a regular basis.
The inlet air filter is located behind the front access cover. To access the filter, loosen the access-cover screw.
Swing top edge of access cover forward. Slide air filter up and out of retaining tabs. The filter may now be cleaned
or new filter installed.
Cleaning Instructions:
1. Flush the filter with warm water from the exhaust side to the intake side. DO NOT USE CAUSTICS.
2. After flushing, allow filter to drain. Placing it with a corner down will assure complete drainage.
3. Recoat the filters with RP Super Filter Coat adhesive. When spraying filter do so from both sides
for maximum concentration of adhesive.
CONDENSER AND EVAPORATOR BLOWERS
Blower motors require no maintenance. All bearings, shafts, etc. are lubricated during manufacturing for the life
of the motor.
If the condenser blower motor (ambient blower) 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 front cover.
Operation of the air conditioner in areas containing airborne
caustics or chemicals can rapidly deteriorate filters, 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 qualified
professionals, generally available through a local, reputable air conditioning repair or service company.
Refer to the data on the nameplate, which specifies 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.
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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 the power to the unit on. The evaporator (Enclosure or “COLD” air) blower should come on. Is
there airflow?
YES, proceed to step 3.
NO, possible problem:
• Open motor winding
• Stuck blower motor
• Obstructed wheel
Repair or Replace
defective part
3. Check thermostat setting and adjust thermostat to the lowest setting. If set point is below the
enclosure temperature, the condenser blower and the compressor should turn on. Note: It could
take up to 5 minutes for the blower to come on after the compressor starts. Did condenser blower
and compressor come on when the thermostat was turned on?
YES, proceed to step 4.
NO, possible problem:
• Defective thermostat
• Cabinet temperature is cooler than
thermostat set point
Replace Part
4. Are both blowers and the compressor running? If not the unit will not cool properly.
5. Check condenser (Ambient or “HOT” air) blower for airflow. Is there airflow?
YES, proceed to step 6.
NO, possible problem:
• Defective thermostat
• Open motor winding
• Stuck blower motor
• Obstructed wheel
• Defective Head Pressure Control
valve
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.
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
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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. If both blowers and the compressor come on, the
thermostat needs to be replaced.
SYMPTOMS AND POSSIBLE CAUSES:
SYMPTOM POSSIBLE CAUSE
Unit won’t cool
Clogged fins on coil(s)
Dirty filter
Blowers 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, contact NVent Equipment Protection at 800-896-2665.
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F-GAS INFORMATION
T290416GXXX
T290426GXXX
T290446GXXX
Refrigerant
Kühlmittel
Chłodziwo R134a
GWP 1430
Factory Charge
Füllmenge durch Hersteller
Opłata Fabryczna
354 Grams
354 Gramm
354 Gramów
CO2 Equivalent
CO2 Equivalent
CO2 Ekwilalent
0.51 Tons
0,51 Tonnen
0,51 Tony
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NOTES
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NOTES
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NOTES
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