It is important that both electrical power and physical site requirements are met prior to receiving equipment. Site preparation work is the responsibility of the customer (renter/lessee) and should be coordinated and paid for by the same.

Electrical Requirements

It is the customer’s responsibility to ensure that all electrical work completed on their property meets local codes. The customer should question any system requirements that are not understood. It is recommended that the customer contract a local licensed electrician to ensure power/service requirements are met by the facility.


Units operate on 460/480 VAC, 3-phase, 60 Hz power with a maximum electrical load, under rated operating conditions, not to exceed 18.75 kVA. The power consumption shall not exceed 15kW.

If 460/480 VAC is not available it is the customer’s responsibility to determine the power voltage available and communicate the same to you. You should dispatch equipment fitted with a step-up power transformer to meet the customer’s needs. Step-up transformers to accommodate either 208VAC or 230/240 VAC, 3-phase, 60 Hz power.
are recommended.

If the customer plans to invest in new electrical service in for this application, 460/480 VAC would be the more economical choice.

Phase Sequence

Since the compressor motor, which is the only 3-phase component on the refrigeration system, can rotate in either direction, having the proper “phase” sequence is not an issue. Fan motors are single phase.

Reefer Unit Circuit Breakers

FYI – These breakers are built into the reefer system.
460/480 VAC (25 amp) circuit breaker – must trip at 29 amps (standard) 230/240 VAC (50 amp) circuit breaker – must trip at 62.5 amps (optional) 208 VAC (70 amp) circuit breaker (optional)

Hardwiring vs. Use of Receptacles

There are two ways to connect the unit’s voltage power cable to electrical service.

1) Hardwiring – which typically requires that a licensed electrician connect each of 3 power legs and one ground connection to an electric service panel.

2) Receptacles – if the unit will be connected and disconnected frequently this may be the best method to connect the unit to power.

Electrical Plugs

There are two plug designs on the market that can be used with this equipment, a marine, and a domestic type plug.

Marine plugs CEE-17:

All refrigeration systems should be provided with a 460/480 VAC marine design power plug. If the customer plans on using 230/240
VAC power, then the 460/480 VAC plug is necessary, it connects to the unit’s step-up transformer, see diagram at right.

If the customer will operate on 460/480 VAC and plans to hardwire the same, they can have their electrician remove the supplied plug upon arrival at their site. This plug should be reinstalled when returned. Missing plugs should be charged back
to the customer for both parts and labor.

Marine Plug Specifications:
For 460/480 VAC power use 380/440 VAC, 32 AMP, 3-Pole, 4 Wire plug For 208/230/240 VAC power use 250 VAC, 50 AMP, 3-Pole, 4 Wire plug

Plug/Receptacle source – ERO Electric Reefer Outlets,

Domestic Plugs:

Trailer refrigeration systems with electric standby typically use a domestic type of plug. If the customer requires a domestic plug they will need to arrange for the purchase and installation of the same.

Domestic Plug/Receptacle Source – HUBBELL The customer’s electrician should determine if Hubbell’s TWIST-LOCK® devices (3 Pole, 4 wire ground plugs and receptacles available in both 480VAC, 50A, 3φ, and 250VAC, 50A, 3φ) meets their local requirements.

Land Site Preparation

Grounded Operation

If the unit will be placed on the ground, without a chassis (wheels), note the following points:

• Ensure there is sufficient space for a tilt-bed delivery truck or crane to safely unload the container.
• The surface that the unit will be placed on must be level and free of accumulating water.
• The unit must be placed within 50 feet of a power receptacle or service box.
• Containers are designed to be supported by their (4) corner castings. If the container cannot be placed on a level concrete surface where only the corner castings are touching the ground, use railroad ties or paving stones to support the corner castings. Never attempt to support the container from any other points on the bottom of the frame.
• Position the machinery end of the container no less than 3 feet from a wall or other objects that may block the airflow.


• Units have 4ft wide, bi- fold swing rear doors. Ensure there are no physical obstructions to prevent doors from opening fully before “placing” unit.
• Units should be operated in areas with ambient temperatures below 100oF, and never exceeding 122 oF.
• Save on energy expenses by placing the refrigeration unit in a shaded area.
• If planning to operate container indoors, defrost drain line may need to be routed to a pail or collection device to meet OSHA standing water requirements. Additionally, the space may need to be ventilated to control the ambient temperature and limit the heat load on the refrigeration system.

Wheeled Operation

If the container will remain on a chassis while in use at the customer’s facility, the unit can be treated like a trailer. The only caveat being, the container must be unplugged from its stationary electrical power outlet and the 60’ cable properly coiled up and secured before moving the chassis.

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