nVent CR29 Air Conditioner Instruction Manual

nVent CR29 Air Conditioner

PROAIR Air Conditioner
Model: CR29

INSTRUCTION MANUAL

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.

CAUTION

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.

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.

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 6 for 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 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. 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.
7. 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.

TECHNICAL INFORMATION

DESIGN DATA

Model| Voltage| Hz| Phase| BTU/Hr @        Amps @ 131 F/131 F   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| 1| 2600/3000| 9.2/7.8| 1900/2400| 9.0/6.9| 131/55| 98/44
CR290226GXXX| 230| 50/60| 1| 2600/2700| 3.7/3.6| 2200/2700| 3.4/3.1| 131/55| 98/44
CR290416GXXX| 115| 50/60| 1| 3500/4000| 12.7/12.1| 2400/2800| 11.9/9.4| 131/55| 118/54
CR290426GXXX| 230| 50/60| 1| 3500/4000| 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 specific model numbers.

DIMENSION DRAWING

CR29 MODELS 2700-4000 BTU/HR. (791-1172 WATT)

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 flow. Allow 20 inch above filter for removal.
Mounting gasket kit part no. 29-4100-02 as applied to rear of CR29.

MOUNTING CUTOUT DIMENSIONS

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

29-4120-10
8| Compressor thermal overload switch| See Components List
9| Capacitor, 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

WIRE DIAGRAMS AND SCHEMATICS

WIRE DIAGRAM, LEVEL 1, 2000 BTU

SCHEMATIC, LEVEL 1, 2000 BTU

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.

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.

WIRE DIAGRAM, LEVEL II AND III, 2000 BTU

SCHEMATIC, LEVEL II AND III, 2000 BTU

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.

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.

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 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 shut-down 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.

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. Since they are constructed entirely of aluminum, they are lightweight and easy to service. Optimum filter performance is maintained by recoating the filters after washing with RP Super Filter Coat adhesive. 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 right side panel. To access the filter, pull from slot on top cover. The filter may now be cleaned or a 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 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.

CAUTION

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.

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.

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 airflow?

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 airflow. Is there airflow?

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

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.

SYMPTOMS AND POSSIBLE CAUSES:

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.

F-GAS INFORMATION

| CR290216GXXX| CR290226GXXX CR290246GXXX CR290416GXXX CR290426GXXX CR290446GXXX
---|---|---
Refrigerant Kühlmittel Chłodziwo| R134a| R134a
GWP| 1430| 1430
Factory Charge
Füllmenge durch Hersteller
Opłata Fabryczna| 340 Grams
340 Gramm
340 Gramów| 312 Grams
312 Gramm
312 Gramów
CO2 Equivalent CO2 Equivalent CO2 Ekwilalent| 0.49 Tons
0,49 Tonnen 0,49Tony| 0.45 Tons
0,45 Tonnen
0,45 Tony

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