nVent T-Series T43 Model Air Conditioner Instruction Manual

Warranty and Return Policy

Refer to the warranty and return policy information available at the following link: 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.

WARNING: Disconnect the power source from the air conditioner before servicing. ⚡

Receiving the Air Conditioner

Inspect the air conditioner upon receipt for any concealed damage that may have occurred during shipment, such as dents, scratches, loose assemblies, or oil evidence. Note any damage on the freight bill. Report damage to the delivering carrier within 15 days of delivery, not to nVent Equipment Protection. Save the carton and packing material and request an inspection. nVent Equipment Protection cannot accept responsibility for freight damages but will assist in the claims process.

Handling and Testing the Air Conditioner

If the air conditioner has been stored horizontally, ensure it is placed in an upright, vertical, or mounting position for at least five (5) minutes before operation.

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, and operating it in this state will cause permanent damage and void the warranty. ⚠️

Test the unit's functionality before mounting it to the enclosure. Refer to the nameplate for electrical requirements and connect to a properly grounded power supply. The minimum circuit ampacity should be at least 125% of the amperage shown in the design data section. Avoid connecting other equipment to this circuit to prevent overloading.

Operate the air conditioner for five (5) to ten (10) minutes. Listen for excessive noise or vibration. The condenser blower (ambient air), evaporator impeller (enclosure air), and compressor should be running. Condenser air temperatures should rise above normal room temperatures within minutes. The compressor has automatic reset thermal overload protection. This switch will activate if the compressor overheats due to a dirty filter, high ambient temperatures, or excessive enclosure heat loads, stopping compressor operation. The blowers will continue to run, and the compressor will restart once it cools to the thermal overload cut-in temperature setting.

Installation Instructions

1. Inspect the air conditioner and verify correct functionality before mounting. Refer to the "HANDLING AND TESTING THE AIR CONDITIONER" section on page 3.
2. Using the cutout dimensions specified in the "MOUNTING CUTOUT DIMENSIONS" section on page 6, prepare the air "IN" and air "OUT" openings, and the mounting bolt hole pattern for the enclosure.
3. Using the provided gasket kit, install gaskets to the air conditioner. Refer to the "MOUNTING GASKET KIT" on page 7 for proper location.
4. Mount the air conditioner onto the enclosure using the provided mounting bolts and screws. "EZ" mount tabs can assist in holding the unit during mounting. Ensure the unit remains upright for a minimum of five (5) minutes before starting. Caution: The air conditioner must be in an upright position during operation.
5. To prevent cross-threading mounting inserts, start bolts by hand before tightening with a wrench or ratchet driver.
6. When routing the drain tube, ensure it does not kink or elevate above the air conditioner's exit point. The drain tube must maintain a continuous downward slope. Any elevation could result in a secondary trap, potentially causing the condensate drain pan to overflow. FAILURE TO FOLLOW THESE INSTRUCTIONS COULD RESULT IN OVERFLOWING OF THE CONDENSATE DRAIN PAN.
7. Refer to the nameplate for electrical requirements. Connect the power cord to a properly grounded power supply. Using an extension cord is not recommended. The electrical circuit should be fused with a slow blow or HACR circuit breaker.

Design Data

XXX will be replaced with a three-digit number designating all desired options. Consult the factory for specific model numbers.

Dimensional Drawings

The document includes detailed dimensional drawings for the T-Series Air Conditioner. For the 6K BTU model, the overall dimensions are approximately 43.00 inches in height, 15.75 inches in width, and 15.64 inches in depth. It shows the placement of ambient air inlet/outlet ports and enclosure air inlet/outlet ports. Front, side, and rear views are provided, indicating measurements for features like the power cord, alarm wires, and drain location.

The 8-10K BTU model shares similar overall dimensions to the 6K BTU model, approximately 43.00 inches in height, 15.75 inches in width, and 15.64 inches in depth. The drawings illustrate the same port configurations (ambient and enclosure air), power cord, alarm wires, and drain location, with specific measurements detailed for each view.

Mounting Cutout Dimensions

This section provides precise measurements for preparing enclosure cutouts. Two sets of diagrams are shown: 'External Cutout' and 'Internal Cutout'. These diagrams detail the required dimensions for the air inlet and outlet openings, as well as the pattern for mounting bolt holes. For example, the external cutout shows dimensions up to 43.00 inches in height and 40.38 inches in width, with specific hole placements indicated. The internal cutout dimensions are also detailed, showing variations for mounting from the inside.

Mounting Gasket Kit

A mounting gasket kit (Part No. 45-1000-50) is included. The gasket should be applied to the air conditioner before mounting it to the enclosure. Diagrams depict 'External Mount (Evap Side)' and 'Internal Mount (Cond Side)', showing where the gasket is placed on the unit's frame. A note specifies adding a strip to the evaporator pan if internally mounted.

Components List (115 Volt)

The document includes diagrams showing the physical location of these components within the 115V unit, referencing item numbers.

Components List (230/460 Volt)

Diagrams are provided showing component locations for 230/460V models and specifically for 460V 3-Phase models, referencing item numbers.

Wiring Diagram and Schematic

The document includes generic wiring diagrams and schematics that may vary based on unit options. Page 10 shows a 'Generic Wire Diagram' illustrating connections for the service cord, heater, thermostats, freeze stat, compressor, various motors (ambient and enclosure impellers), and control components like start relays and capacitors. Page 11 provides 'Generic Schematic for 1-Phase Models' and 'Generic Wire Diagram for 3-Phase Models'. These schematics detail the electrical flow, including transformers, filters, motors, compressors, control switches, and safety components like overload protection and phase monitors. They are intended for qualified technicians.

Temperature Control

The electromechanical thermostat is factory preset to 75°F (24°C). To change the temperature setting, remove the nylon plug (if applicable) and use a screwdriver. Turning clockwise adjusts for cooler temperatures, counterclockwise for warmer. The set point equals the off temperature; the on temperature is 10°F (5°C) above the set point.

Units With Heat

The heating thermostat is factory preset to 55°F (13°C). The set point for the heating thermostat equals the on temperature; the off temperature is 10°F (5°C) above the set point.

Principles of Operation

If electrical power to the air conditioner is interrupted and reapplied within 3 to 5 seconds, the compressor may not restart immediately due to high back pressure. It requires approximately one minute after shut-down for the compressor suction and discharge pressures to equalize before the unit can 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 to review the warranty section for parameters of restricted operation. The moisture content of the enclosure air is limited; continuous drainage from the drain tube may indicate ambient air entering the enclosure. Frequent opening of the enclosure 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 designed for years of satisfactory service. Recharging ports (access fittings) on the suction and discharge sides are provided for qualified refrigeration repair service personnel for recharging or checking refrigerant pressures. Under no circumstances should these access fitting covers be loosened, removed, or tampered with, as this will void the warranty on the hermetic system.

Inlet Air Filter

Proper maintenance of the inlet air filter, located behind the front cover, is essential for normal operation. Delayed or ignored filter maintenance reduces the maximum ambient temperatures at which the unit can operate. A dirty or clogged filter (or plugged condenser coil) can cause the compressor's operating temperature to increase, triggering the thermal overload cut-out switch and stopping compressor operation. The compressor will restart once it cools, but this cycle will repeat until the filter or coil is cleaned. It is recommended to interrupt power when this occurs. Running the unit with the filter removed can allow dust and lint to clog the condenser coil. Continued operation under these conditions can damage the compressor. The unit features an easily removable inlet filter for convenient cleaning.

How To Remove, Clean or Install a New Inlet Air Filter

RP aluminum washable air filters offer high efficiency and low airflow resistance. They are lightweight and easy to service. Optimum performance is maintained by recoating after washing with RP Super Filter Coat adhesive. To clean the filter: 1. Flush with warm water from the exhaust side to the intake side (DO NOT USE CAUSTICS). 2. Allow to drain completely. 3. Recoat with RP Super Filter Coat adhesive, spraying from both sides for maximum concentration. The filter is accessed via a lower access cover or a pull ring.

Condenser and Evaporator Air Movers

Impeller motors require no maintenance as bearings and shafts are lubricated for life. If the condenser impeller motor fails, it can be replaced without removing the air conditioner from the enclosure; the blower is accessible by removing the lower access panel.

CAUTION: Operation of the air conditioner in areas containing airborne caustics or chemicals can rapidly deteriorate filters, condenser coils, blowers, and motors. Contact nVent Equipment Protection for special recommendations. ⚠️

Refrigerant Loss

Each air conditioner is factory tested for leaks. Shipping damage or microscopic leaks may require repair or recharging by qualified professionals. Refer to the nameplate for refrigerant type and charge size. Before recharging, ensure there are no leaks and the system has been properly evacuated to a deep vacuum.

Trouble Shooting

Basic Air Conditioning Trouble Shooting Check List

1. Check the manufacturer's nameplate on the unit for correct power supply.
2. Turn on power. The evaporator (enclosure or "COLD" air) impeller should activate. Check for airflow. If there is no airflow, possible issues include: Open motor winding, Stuck impeller motor, Obstructed wheel. In this case, repair or replace the defective part.
3. Check the thermostat setting and adjust it to the lowest setting. This should activate the condenser impellers and compressor. Verify if they turned on. If not, the possible cause is a Defective thermostat. Replace the part.
4. Confirm that both impellers and the compressor are running. If not, the unit will not cool properly.
5. Check the condenser (ambient or "HOT" air) impellers for airflow. If there is no airflow, possible issues include: Defective thermostat, Open motor winding, Stuck impeller motor, Obstructed wheel. In this case, repair or replace the defective part.
6. Carefully check the compressor for operation: the motor should cause slight vibration, and the outer case should be warm. If the compressor shows no signs of operation, wait 5 minutes and proceed to step 7. If still not operating, possible causes include: Defective thermostat, Defective capacitor, Defective overload, Defective relay. In this case, repair or replace the defective part.
7. Ensure the coils are clean. Check evaporator "air in" and "air out" temperatures. If the temperatures are the same, possible issues include: Possible loss of refrigerant, Possible bad valves in the compressor. In this case, repair or replace the defective part.
8. To check for a faulty thermostat: turn off power, remove the control box cover, and place both thermostat wires onto a single terminal (replace cover for safety). Turn power back on. If both blowers and the compressor start, the thermostat needs to be replaced.

Symptoms and Possible Causes

For additional technical support (e.g., amp draw, pressures, temperatures), contact nVent Equipment Protection at 800-896-2665.

F-Gas Information

This section details refrigerant type, Global Warming Potential (GWP), and factory charge amounts for various models, including CO₂ equivalents. Languages present include English, German ("Kühlmittel", "Füllmenge durch Hersteller", "Gramm", "Tonnen"), and Polish ("Chłodziwo", "Opłata Fabryczna", "Gramów", "Tonnen", "Tony").

Contact Information

nVent
2100 Hoffman Way
Anoka, MN 55303 USA
+1.763.422.2211
+1.763.576.3200
nVent.com