T-SERIES
Air Conditioner
t15 Model
INSTRUCTION MANUAL
Rev. F
© 2018 nVent 89059119
P/N 10-1008-194
TABLE OF CONTENTS
RECEIVING THE AIR CONDITIONER ...............................................................................................................................................3
HANDLING AND TESTING THE AIR CONDITIONER ......................................................................................................................3
INSTALLATION INSTRUCTIONS .....................................................................................................................................................4
Design Data .....................................................................................................................................................................................................4
Dimensional Drawing .....................................................................................................................................................................................4
Mounting Cutout Dimensions ........................................................................................................................................................................5
Components List ............................................................................................................................................................................................5
Wire Diagrams .................................................................................................................................................................................................6
Without Heat ...........................................................................................................................................................................................6
With Heat .................................................................................................................................................................................................7
Schematics .....................................................................................................................................................................................................8
TEMPERATURE CONTROL ..............................................................................................................................................................9
Units With heat ................................................................................................................................................................................................9
PRINCIPLES OF OPERATION ..........................................................................................................................................................9
MAINTENANCE ............................................................................................................................................................................. 10
Compressor ...................................................................................................................................................................................................10
Inlet Air Filter .................................................................................................................................................................................................10
How To Remove, Clean or Install a New Inlet Air Filter .............................................................................................................................10
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.
CAUTION
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.
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 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 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.
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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 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.
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
T150116GXXX 115 60 3.6 1 800 131/55 27/12.3
T150116GXXX 100 50 3.8 1 800 125/52 27/12.3
T150126GXXX 230 60 1.5 1 900 131/55 27/12.3
T150126GXXX 220 50 1.4 1 800 125/52 27/12.3
-XXX will be replaced with a three-digit number designating all desired options. Consult the factory for specic model numbers.
Full Load
Amps
Phase
BTU/Hr. @
Max Ambient
Temperature
Max Ambient
Temperature
(°F/°C)
Shipping
Weight
(lb./kg)
DIMENSIONAL DRAWING
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MOUNTING CUTOUT DIMENSIONS
87981867
Externally Mounted Internally Mounted
Cutout Instructions
(As viewed from outside of enclosure)
NOTE: Phantom lines represent air conditioner.
COMPONENTS LIST
Part Description
115V 230V
Fan, Condenser 12-1012-01 12-1012-02
Fan, Evaporator 13-1015-01 13-1015-02
Capacitor, Compressor 52-6032-09 52-6032-10
Coil, Condenser 15-1001-02 15-1001-02
Coil, Condenser, Coated 15-1001-01 15-1001-01
Coil, Evaporator 15-1001-03 15-1001-03
Compressor 10-1016-82 10-1026-101
Filter, Air, Reusable 89057626 89057626
Filter/Dryer 52-6028-03 52-6028-03
Freeze stat 10-1033-26 10-1033-26
Service Cord 52-6035-140 52-6035-141
Terminal Block 10-1003-03 10-1003-03
Thermal Overload, Compressor 10-1007-67 10-1007-68
Thermostat, SPST, 55-100F 10-1061-16 10-1061-16
Optional Heater 10-2004-23 10-2004-24
Optional Malf Switch 52-6104-42 52-6104-42
Part Number
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© 2018 nVent
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WIRE DIAGRAMS
WITHOUT HEAT
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WITH HEAT
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SCHEMATICS
With Heat Without Heat
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TEMPERATURE CONTROL
The electromechanical thermostat is factory preset to 75 F/23 C. To change the temperature setting, remove
the nylon plug from the front face of the unit. Use a standard screwdriver to adjust thermostat. For cooler
temperatures turn clockwise, for warmer temperatures turn counterclockwise. Setpoint differential is 6 F.
UNITS WITH HEAT
With a dial setting of 75 F, heat will turn on @ 70 F and turn off @ 75 F. Cooling will turn on @ 85 F and turn off
at80 F.
There is a 10 F difference between the heater off setpoint and cooling on setpoint to prevent both from operating
at the same time.
The dial range of the thermostat is 50-95 F.
PRINCIPLES OF OPERATION
If electrical power to the air conditioner is interrupted and reapplied immediately, (within 3 to 5 seconds),
thecompressor 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.
Units with the optional malfunction switch have a normally open connection between the red & yellow wires and
normally closed with the red and blue wires. During alarm the red and yellow wires will be closed and the blue and
red wires will be open.
Maximum electrical ratings for the switch are 13A for 120 VAC and 10A for 240 VAC.
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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 shutdown 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.
HOW TO REMOVE, CLEAN OR INSTALL A NEW INLET AIR FILTER
RP aluminum washable air lters are designed to provide excellent ltering eciency 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 front cover. To access lter, pull ring protruding from slot in bottom of front
cover. 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.
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CONDENSER AND EVAPORATOR AIR MOVERS
Fan motors require no maintenance. All bearings, shafts, etc. are lubricated during manufacturing for the life of
the fan.
CAUTION
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.
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 qualied
professionals, generally available through a local, reputable air conditioning repair or service company.
Refer to the data on the nameplate which species 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
deepvacuum.
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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) fan should come on.
Is there airow?
YES, proceed to step 3.
NO, possible problem:
• Open motor winding
• Stuck fan motor
• Obstructed blades
Repair or Replace
defective part
3. Check thermostat setting and adjust thermostat to the lowest setting. This should turn the
condenser fan and the compressor on. Did condenser fan 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 fans and the compressor running? If not the unit will not cool properly.
5. Check condenser (Ambient or “HOT” air) fan for airow. Is there airow?
YES, proceed to step 6.
NO, possible problem:
• Defective thermostat
• Open motor winding
• Stuck fan motor
• Obstructed blades
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 activate
the switch in the thermostat. Turn the power on and if both fans and the compressor come on, the
thermostat needs to be replaced.
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© 2018 nVent
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SYMPTOMS AND POSSIBLE CAUSES:
SYMPTOM POSSIBLE CAUSE
Unit won’t cool
Compressor tries to start but won’t run
Clogged ns on coil(s)
Dirty lter
fans not running
Compressor not running
Compressor runs, but has bad valves
Loss of refrigerant
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
Getting water in enclosure
Undersized breaker/fuse or not time delayed
Short in system
Drain plugged
Drain tube kinked
Enclosure not sealed (allowing humidity in)
Mounting gasket damaged
For additional technical information (i.e., amp draw, pressures, temperatures) , contact nVent
Equipment Protection at 800-896-2665.
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© 2018 nVent
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NOTES
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NOTES
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© 2018 nVent
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Rev. F
© 2018 nVent 89059119
P/N 10-1008-194
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