Electrical Connection

Heatcraft Refrigeration Products PRO3 Refrigeration Sequence of Operation, Electrical Connection

PRO3 Side Mount Packaged Refrigeration System

1.Refer to all local codes for proper connection.

2.A knock-out is provided for 1" conduit on the side of the condensing unit section above the electrical box. See FIGURE 12.

3.Wire will be brought into the electrical box through the bottom of the electrical box and connected to the top of the contactor.

Refrigeration Sequence of Operation

1.Power is provided to the temperature control, compressor contactor and cooler evaporator fans.

2.The temperature controller closes and energizes the compressor contactor, starting the compressor, evaporator and condenser fan(s).

3.When the system reaches the desired box temperature, the temperature control will de-energize the compressor contactor. Evaporator fans will continue to operate at this point.

4.When the fixture temperature rises above the set point

and minimum off-time has elapsed, the temperature control will close and re-energize the compressor contactor.

Coolers: Air-defrost Operation

Air defrost units are pre-programmed for 4 defrost per day. These periods are reprogrammable. When the coil temperature reaches 38°F, the control will terminate the defrost cycle.

For programming information see pages 7-16.

Cooler with Electric Defrost and Freezer Temperature/Defrost Control

PRO3 packaged refrigeration system cooler with electric defrost and freezer units come factory equipped with an electronic temperature/ defrost control.

For programming information see pages 7-16.

Table 1 Model PST Default Temperature Control Settings

Cooler with Electric Defrost and Freezer Sequence of Operation

Power is provided to the temperature control and compressor contactor. The drain line heater as well as the crankcase heaters will also have continuous power supplied to them.

The temperature controller energizes the compressor contactor, starting the compressor and condenser fan(s). The evaporator fans will be energized by the electronic controller.

When the system reaches the desired box temperature, the temperature control will de-energize the compressor contactor and the evaporator fans.

When the temperature rises above the set point and minimum off- time (4 minutes) has elapsed, the temperature control will close and re-energize the compressor contactor.

1.During normal operation, at the preset times of day, the temperature/defrost control will de-energize the compressor contactor and evaporator fans and energize the defrost heaters. These functions are controlled through relays on the controller.

2.When the coil has defrosted fully and has reached the preset coil temperature (as sensed by the coil temperature sensor) the defrost heater de-energizes and the fan delay and drip sequences begin.

3.The temperature/defrost control energizes the compressor contactor, starting the compressor and condenser fan(s).

4.Freezer evaporator fans will be energized by the temperature/ defrost control when the coil temperature reaches 35°F or fan delay time has elapsed.

Application:

Temperature set

points

Defrost start times

Defrost	Drip Time	Fan Delay
Duration	Drip Time	Fan Delay
Duration
	Minutes

Defrost

Termination

Set Point

Cooler: 35˚ F	Every 3 hours of	60	–	–	38˚ F
Cooler: 35˚ F	compressor run time	60	–	–	38˚ F
	compressor run time

Cooler w/ Electric		40	2	2	65˚ F
Defrost: 34˚ F		40	2	2	65˚ F
Defrost: 34˚ F
Freezer: -10˚ F	4 times / day	40	2	2	65˚ F

PRO3 Side Mount Packaged Refrigeration System Installation and Operations Manual, May 2008

PRO3 specifications

Heatcraft Refrigeration Products PRO3 is an innovative line of refrigeration solutions designed to meet the dynamic needs of various commercial environments. Renowned for its energy efficiency, reliability, and user-friendly features, the PRO3 series is a game changer in the realm of temperature control.

One of the standout features of the PRO3 is its advanced microprocessor control system. This technology allows for precise temperature management, ensuring that perishable goods are maintained at optimal conditions. The intuitive interface makes monitoring and adjustments hassle-free, further enhancing user convenience.

Another notable characteristic is the PRO3's energy-efficient design. Engineered with the latest sustainable practices in mind, these refrigeration units consume significantly less power than their counterparts. This energy efficiency not only reduces operating costs but also minimizes the environmental impact of refrigeration operations.

The PRO3 series incorporates advanced evaporator and condenser coil designs that maximize heat exchange and cooling performance. This optimizes the refrigeration cycle, contributing to quick recovery times and overall system efficiency. The inclusion of high-performance fans ensures consistent air distribution, preventing temperature fluctuations that could jeopardize product integrity.

Durability is a core attribute of the PRO3. Constructed with high-quality materials, these refrigeration units are designed for long-lasting performance, even in challenging environments. Their robust build ensures they can handle the rigors of daily use in busy commercial settings.

Moreover, the PRO3 series features easy accessibility for maintenance, which is crucial for prolonging the lifespan of the equipment. Maintenance-friendly designs make it straightforward for technicians to conduct service checks and repairs, reducing downtime and enhancing operational efficiency.

The PRO3 also includes customizable options to cater to specific customer needs, such as different sizes and configurations. This versatility makes it ideal for a wide range of applications, from supermarkets to restaurants and storage facilities.

In summary, Heatcraft Refrigeration Products PRO3 stands out with its sophisticated temperature control, energy efficiency, and durable construction. Combining advanced technologies with user-friendly features, it represents a modern solution for commercial refrigeration, ensuring optimal performance and product preservation.

PRO3 Side Mount Packaged Refrigeration System