nVent Hoffman PROAIR CR29 Series User manual

© 2018 nVent 89104461
Rev. I P/N 89104461
PROAIR
Air Conditioner
Cr29 Model
INSTRUCTION MANUAL

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WARRANTY AND RETURN POLICY
https://hoffman.nvent.com/en/hoffman/warranty-information
TABLE OF CONTENTS
Warranty and Return Policy.............................................................................................................................................................2
RECEIVING THE AIR CONDITIONER...............................................................................................................................................3
HANDLING AND TESTING THE AIR CONDITIONER......................................................................................................................3
INSTALLATION INSTRUCTIONS .....................................................................................................................................................4
SYSTEM CONTROLS........................................................................................................................................................................4
Level I Temperature Controller ......................................................................................................................................................................4
Level II and III Temperature Controller ..........................................................................................................................................................4
TECHNICAL INFORMATION............................................................................................................................................................5
DESIGN DATA..................................................................................................................................................................................................5
DIMENSION DRAWING...................................................................................................................................................................................5
CR29 Models 2700-4000 BTU/Hr. (791-1172 Watt) ............................................................................................................................5
Mounting Gasket Kit.......................................................................................................................................................................................6
Design Notes...........................................................................................................................................................................................6
Mounting Cutout Dimensions........................................................................................................................................................................6
Components List ............................................................................................................................................................................................7
Parts List .........................................................................................................................................................................................................7
Wire Diagrams and schematics ....................................................................................................................................................................8
Wire Diagram, Level 1, 2000 BTU ..........................................................................................................................................................8
Schematic, Level 1, 2000 BTU ...............................................................................................................................................................8
Wire Diagram, 115V, Level 1, 4000 BTU ................................................................................................................................................9
Schematic, 115V, Level 1, 4000 BTU .....................................................................................................................................................9
Wire Diagram, 230V, Level 1, 4000 BTU ..............................................................................................................................................10
Schematic, 230V, Level 1, 4000 BTU ...................................................................................................................................................10
Wire Diagram, Level II and III, 2000 BTU .............................................................................................................................................11
Schematic, Level II and III, 2000 BTU..................................................................................................................................................12
Wire Diagram, 115 VLevel II and III, 4000 BTU ...................................................................................................................................13
Schematic, 115 V Level II and III, 4000 BTU .......................................................................................................................................13
Wire Diagram, 230 V Level II and III, 4000 BTU ..................................................................................................................................14
Schematic, 230 V Level II and III, 4000 BTU .......................................................................................................................................14
TEMPERATURE CONTROL........................................................................................................................................................... 15
PRINCIPLES OF OPERATION ....................................................................................................................................................... 15
MAINTENANCE............................................................................................................................................................................. 15
Compressor...................................................................................................................................................................................................15
Inlet Air Filter .................................................................................................................................................................................................15
How To Remove, Clean or Install a New Inlet Air Filter .............................................................................................................................16
Condenser and Evaporator Air Movers.......................................................................................................................................................16
Refrigerant Loss............................................................................................................................................................................................16
TROUBLE SHOOTING ................................................................................................................................................................... 18
Basic Air Conditioning Trouble Shooting Check List.................................................................................................................................18
Symptoms and Possible Causes:................................................................................................................................................................19

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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 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 air conditioner and verify 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
6for proper location.
4. Mount air conditioner on enclosure using mounting bolts and washers provided to secure unit to
enclosure. 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. Refer to the top of the 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.
6. When the unit is equipped with an automatic temperature controller, the controller is preset at the
factory for your convenience and should not require adjustment.
SYSTEM CONTROLS
LEVEL I TEMPERATURE CONTROLLER
The Level I controller is located inside the air
conditioner. To adjust, disconnect power to the air
conditioner and open the front panel by loosening the
front panel screw. Refer to Figure 2 on page 7 to
locate the controller. Turn the controller adjustment
screw slot counter-clockwise to increase and
clockwise to decrease the temperature set point, see
Figure 1. The thermostat cooling set point is indicated
by the alignment of the adjustment screw slot with the
dial decal. After completing adjustment, close the front
panel and tighten the front panel screw. Restore power
to the air conditioner for operation.
LEVEL II AND III TEMPERATURE
CONTROLLER
The Level II and III controller mounted on the air
conditioner front panel is factory set for standard
operation. All operating parameters are programmable
for custom applications. Refer to the Level II and III
programming and Operating Instruction Manual,
10-1008-161.
Figure 1
Level I control

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TECHNICAL INFORMATION
DESIGN DATA
Model Voltage Hz Phase BTU/Hr @
131 F/131 F Amps @ 131 F/131 F BTU/Hr @ 95 F/95 F Amps @ 95 F/95 F
Max
Amb
Temp
°F/°C
Shipping
Weight
lb./kg
CR290216GXXX 115 50/60 12600/3000 9.2/7.8 1900/2400 9.0/6.9 131/55 98/44
CR290226GXXX 230 50/60 12600/2700 3.7/3.6 2200/2700 3.4/3.1 131/55 98/44
CR290416GXXX 115 50/60 13500/4000 12.7/12.1 2400/2800 11.9/9.4 131/55 118/54
CR290426GXXX 230 50/60 13500/4000 4.7/4.9 2400/2800 4.1/4.2 131/55 118/54
-XXX will be replaced with a three-digit number designating all desired options. Consult the factory for specic model numbers.
DIMENSION DRAWING
CR29 MODELS 2700-4000 BTU/HR. (791-1172 WATT)

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MOUNTING GASKET KIT
DESIGN NOTES
1. Gasket kit included. Apply gasket to rear
of air conditioner before mounting on
enclosure.
2. Service cord terminated with
appropriate plug cap.
3. Millimeter dimensions [ ] are for
reference only; do not convert to inch
dimensions.
4. Allow at least 4 inch inlet and 6 inch
outlet clearance for proper ambient
air ow. Allow 20 inch above lter for
removal.
Mounting gasket kit part no. 29-4100-02 as applied to
rear of CR29.
MOUNTING CUTOUT DIMENSIONS
1. DASHED LINES REPRESENT OUTSIDE OF AIR C
ONDITIONER
NOTE:
Cutout Instructions

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COMPONENTS LIST
Part Description 115 Volt
2700 115 Volt 4000 230 Volt 3000 230 Volt 4000
Blower, Condenser 29-4121-10 29-4121-10 29-4120-10 29-4120-10
Blower, Evaporator 29-4121-10 29-4121-10 29-4120-10 29-4120-10
Capacitor, Compressor, Start 89111993 N/A 89117017 89104095
Compressor 89108747 89100365 89108748 89104088
Thermal Overload, Compressor 89111994 N/A 89111997 89112198
Filter, Air, Reusable 10-1000-32 10-1000-32 10-1000-32 10-1000-32
Thermostat, SPST, 55-100F 10-1061-16 10-1061-16 10-1061-16 10-1061-16
Mounting Gasket Kit 29-4100-02 29-4100-02 29-4100-02 29-4100-02
Relay, Compressor, Start 89111992 N/A 89111995 89104096
Power Cord Consult factory Consult factory Consult factory Consult factory
Capacitor, Compressor, Run N/A N/A N/A 89104097
PARTS LIST
Part Description Part No.
1Condenser Coil 29-4101-00
2Filter, drier, refrigerant 52-6028-00
3Compressor See Components List
4Hot Gas bypass valve
(CR29-04xx units only) 89100261
5Evaporator coil 29-4102-00
6Inlet air lter,
reusable aluminum 10-1000-32
7Blower (115V)
Blower (230V) 29-4121-10 29-4120-10
8Compressor thermal
overload switch See Components List
9Capacitor, compressor, start (CR290426 and CR290446
units only) See Components List
10 Capacitor, compressor (CR2902XX and
CR290416GXXX units only) See Components List
11 Terminal block 086912
12 Power cord Consult Factory
13 Temperature controller Consult Factory
14 Relay, compressor, start (CR290426 and CR290446
units only) See Components List
15 Relay, compressor (CR2902XX and
CR290416GXXX units only) See Components List
16 Mounting gasket kit 29-4100-02
17 Capacitor, Compressor, Run See Components List
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Figure 2

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WIRE DIAGRAMS AND SCHEMATICS
WIRE DIAGRAM, LEVEL 1, 2000 BTU
89111534 A
SCHEMATIC, LEVEL 1, 2000 BTU

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WIRE DIAGRAM, 115V, LEVEL 1, 4000 BTU
SCHEMATIC, 115V, LEVEL 1, 4000 BTU
NOTE: For voltage, hertz, and options not shown in this manual, refer to the wiring diagram
attached to the unit.

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WIRE DIAGRAM, 230V, LEVEL 1, 4000 BTU
SCHEMATIC, 230V, LEVEL 1, 4000 BTU
NOTE: For voltage, hertz, and options not shown in this manual, refer to the wiring diagram
attached to the unit.

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WIRE DIAGRAM, LEVEL II AND III, 2000 BTU

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SCHEMATIC, LEVEL II AND III, 2000 BTU

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WIRE DIAGRAM, 115 VLEVEL II AND III, 4000 BTU
SCHEMATIC, 115 V LEVEL II AND III, 4000 BTU
NOTE: For voltage, hertz, and options not shown in this manual, refer to the wiring diagram
attached to the unit.

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WIRE DIAGRAM, 230 V LEVEL II AND III, 4000 BTU
SCHEMATIC, 230 V LEVEL II AND III, 4000 BTU
NOTE: For voltage, hertz, and options not shown in this manual, refer to the wiring diagram
attached to the unit.

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TEMPERATURE CONTROL
The electromechanical thermostat is factory preset to 75 F/23 C. To change the temperature setting, refer to
SYSTEM CONTROLS on page 4.
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.

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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. Since 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 right side panel. To access the lter, pull from slot on top cover. The lter
may now be cleaned or a 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
Blower motor requires no maintenance. All bearings, shafts, etc. are lubricated for the life of the motor during
manufacturing.
If one of the condenser impeller motors (ambient impellers) 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 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.

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NOTES

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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) blower should come on. Is
there airow?
YES, proceed to step 3.
NO, possible problem:
• Open motor winding
• Stuck blower motor
• Obstructed wheels/blades
Repair or Replace
defective part
3. Check thermostat setting and adjust thermostat to the lowest setting. This should turn on the
condenser blower and compressor. Did condenser blower 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 blowers and the compressor running? If not, the unit will not cool properly.
5. Check condenser (Ambient or “HOT” air) blower for airow. Is there airow?
YES, proceed to step 6.
NO, possible problem:
• Defective thermostat
• Open motor winding
• Stuck blower motor
• Obstructed wheels/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 off to the unit. Remove control box cover and place
both thermostat wires onto one terminal (replace control box cover for safety). This will bypass
the switch in the thermostat. Turn on the power. If both blowers and the compressor come on, the
thermostat needs to be replaced.

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SYMPTOMS AND POSSIBLE CAUSES:
SYMPTOM POSSIBLE CAUSE
Unit won’t cool
Blower 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 relay
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)
For additional technical support (amp draw, pressures, temperatures), contact nVent
Equipment Protection at 800-896-2665.

© 2018 nVent 89104461
Rev. I P/N 89104461
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