McLean T62 User manual

10-10088-18188-8-ReRev. 5
INSTRUCTION MANUAL
McLean Cooling Technology
11611 Business Park Blvd N
Champlin, MN 55316 USA
Tel [phone]
Fax [phone]
www.McLeanParts.net
T-Series™
Air Conditioner
T62 Model
Protecting Electronics.
Exceeding Expectations.
™

1 10-1008-188 rev 5
TABLE OF CONTENTS
Receiving the Air Conditioner ..................................................................... 1
Handling and Testing the Air Conditioner................................................... 1
Installation................................................................................................... 2
Design Data, Model Drawing ...................................................................... 3
Components List......................................................................................... 4
Wire Diagrams ............................................................................................ 5
Principles of Operation ............................................................................... 6
Maintenance ............................................................................................... 6
Trouble Shooting ........................................................................................ 7
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 MAI
if further information is required.
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
MAI -- within 15 days of delivery. Save the packing material and request an
inspection. Then file a claim with the delivering carrier.
MAI cannot accept responsibility for freight damages; however, we will assist you
in any way possible.
HANDLING & TESTING THE AIR CONDITIONER
If it is necessary to place the air conditioner in a horizontal position after unpacking, be certain it is placed
in an upright, vertical or mounting position for a minimum of five (5) minutes before operating.
Never 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. Running the compressor without oil in the lower part
of the housing will cause permanent damage to the air conditioner. This also voids the warranty.
TEST FOR FUNCTIONALITY BEFORE MOUNTING THE AIR CONDITIONER TO THE ENCLOSURE.
Refer to nameplate for proper electrical current requirements, then wire unit 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.
Immediately after applying power the evaporator blower (enclosure air) should start running. Operate the
air conditioner with the compressor running for five (5) to ten (10) minutes.
Condenser air temperatures should be warmer than normal room temperatures within a few minutes after
the condenser air blower starts.
The compressor is provided with automatic reset thermal overload protection. The switch operates when
the compressor overheats due to a clogged or dirty condenser coil 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
Step 1: Inspect air conditioner. Verify functionality before mounting the air conditioner, see Handling &
Testing the Air Conditioner on page 1.
Step 2: Using the mounting gasket kit provided with the unit, install gaskets to the air conditioner as
shown in Figure 1.
Step 3: Mount air conditioner on enclosure taking care not to damage the mounting gasket. The mounting
gasket is the seal between the air conditioner and the enclosure. Avoid dragging the air conditioner on
the enclosure with the mounting gasket attached as this could cause rips or tears in the gasket and risk
losing the water tight seal.
Step 4: Allow unit to remain upright for a minimum of five (5) minutes before starting. Caution: Air
conditioner must be in upright position during operation.
Step 5: Refer to the nameplate for electrical requirements. Wire the unit to a properly grounded power
supply. Electrical circuit should be fused with slow blow or HACR circuit breaker.
Step 6: The air conditioner requires a remote mounted thermostat and has an alarm feature. Wire the
thermostat and alarm outputs to the appropriate terminals on the 24VAC terminal strip (note locations on
the wiring diagram).

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T62 Series
22,000 BTU/Hr. (6440 Watts) H x W x D: 61.77" (1568.96) x 17.36" (440.94) x 19.88" (504.95)
Full BTU/Hr @ Max Shipping
Load Max Amb Amb Temp Weight
Model Voltage Hz Amps Phase Temp
oF/oC Lbs/Kgs
T62-2226-3XXX 230 60 17.0 1 22,000 131/55 218/99.1
XXX will be replaced with a three-digit number designating all desired options. Consult the MAI for
specific model numbers.
T62 Model Drawing

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T62 Series Components List
Part Description Part Number Part Description Part Number
Blower Motor, Condenser 10-1020-14 Filter/Dryer 52-6028-06
Blower Motor, Evaporator 10-1020-15 Filter, Evap Air Out (Optional) 10-1000-01
Capacitor, Condenser Blower 52-6084-05 Grille, Condenser fan 13-1014-03
Capacitor, Evaporator Blower 52-6084-00 Relay, Alarm 10-1005-62
Capacitor, Compressor, Run 52-6032-06 Relay, Compressor, Start 10-1042-13
Capacitor, Compressor, Start 10-1032-32 Switch, Low Pressure 52-6104-38
Coil, Condenser 62-1001-00 Terminal Block 10-1003-31
Coil, Evaporator 62-1001-03 Thermal Expansion Valve 10-1040-16
Compressor 10-1026-86 Timer, Random Start 10-1005-76
Contactor, Compressor 10-1005-44 Timer, Bypass 10-1005-58
Controller, Head Pressure 10-1106-108 Transformer 10-1006-93

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T62 Generic Schematic (actual unit options may vary)
T62 Generic Wire Diagram (actual unit options may vary)

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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 that 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.
Condenser and Evaporator Air Movers
Blower and impeller 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.
Caution: Operation of the air conditioner in areas containing airborne caustics or chemicals can rapidly
deteriorate filters, condenser coils, blowers and motors, etc. Contact McLean Cooling Technology 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 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: Open motor winding
Stuckblowermotor
Obstructed wheels/blades
3. Check thermostat setting? Adjust thermostat to the lowest setting. This should turn the condenser
blower and the compressor on. Did condenser blower and compressor come on when the thermostat was
turned on?
YES, proceed to step #4.
NO, possible: Defective thermostat
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: Defective thermostat
Open motor winding
Stuckblowermotor
Obstructed wheels/blades
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: Defective thermostat
Defective capacitor
Defective overload
Defectiverelay
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
8. To check for a bad thermostat. Turn power to the unit off. Remove control box cover, 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.
Repair or Replace
defective part
Replace part
Repair or Replace
defective part
Repair or Replace
defective part
Repair or Replace
defective part

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Symptoms and Possible Causes:
SYMPTOM POSSIBLE CAUSE
Unit won’t cool * Clogged fins on coil(s)
*Dirtyfilters
* Blowers/fans 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 * Under sized breaker/fuse or not time delayed
*Shortinsystem
Getting water in enclosure * 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 MAI at 317-257-6811.

McLean Cooling Technology
11611 Business Park Blvd N
Champlin, MN 55316 USA
Tel [phone]
Fax [phone]
www.McLeanParts.net
P
rotecting E
l
ectronics.
Exceeding Expectations.
™
©2008 McLean Midwest Corporation