HRU

Overview

The Champion HRU is an Eseries High Temperature Heat Recovery Unit used with a commercial dishwasher. Its role in the dishwasher system is to preheat incoming cold water before that water reaches the final-rinse booster. Champion’s service and parts manual describes the HRU as significantly reducing the dishwasher’s energy use, though the supplied material does not give a savings percentage.

The manual identifies the HRU as a separate unit that works with the dishwasher’s built-in heat exchanger and final-rinse booster. Its model description and diagram labels identify cold-water inlet, preheated-water outlet, exhaust air and an exhaust-air booster. These labels identify the system connections and components, but the available material does not provide a complete piping or airflow specification.

Key Features

• Incoming-water preheating: The HRU heats cold water supplied to the dishwasher’s built-in heat exchanger to approximately 110°F/43°C.
• Final-rinse support: Preheated water is piped to the final-rinse booster, which ensures a minimum final-rinse water temperature of 180°F/82°C.
• Exhaust-air components: The HRU model diagram identifies exhaust air and an exhaust-air booster. The manual also includes an operation section for indicator lights and exhaust blowers.
• Service documentation: PartHubz provides an HRU service and parts manual and wiring diagram. The parts manual includes component identification and an electrical schematic.

Specifications

• Model: HRU.
• Product type: Eseries High Temperature Heat Recovery Unit.
• Incoming water preheat: Approximately 110°F/43°C.
• Final-rinse water temperature: The final-rinse booster ensures a minimum of 180°F/82°C.
• Dishwasher connection: Preheated water is plumbed to the final-rinse water booster.
• System labels shown in the manual: Cold water in, preheated water out, exhaust air and exhaust-air booster.
• Control components listed in the parts manual: Temperature control module, fixed 15-second and 30-second timers, indicator lights, relay and transformer.
• Serial-number parts distinction: The manual shows control-cabinet arrangements for units prior to serial number J11022850 and units beginning with serial number J11022850. The later parts list includes a 2-amp circuit breaker; the revision history notes its addition for that serial-number range.
• Manual reference: Installation/Operation Guide with Service Replacement Parts, manual P/N 114819, revision A, issue date 2.18.11. The manual states it applies to machines built from 8.21.09.

Installation & Requirements

The supplied manual states that installation and initial start-up of the dishwasher must be performed by qualified electricians, plumbers and authorized service technicians trained in commercial dishwashers. It warns that defects and repairs caused by unauthorized installers will not be covered by the dishwasher warranty.

The manual’s contents list sections for mounting, plumbing connections, pressure-reducing valve settings and electrical schematics. The available source material does not provide the associated procedures, clearances, utility ratings or connection details, so those requirements should be confirmed in the complete guide for the specific unit. The manual’s one-line piping diagram is identified in its contents, but the provided text does not include enough detail to reproduce its connections.

Operation

During operation, the HRU heats cold water supplied to the dishwasher’s built-in heat exchanger. The manual gives the resulting incoming-water temperature as approximately 110°F/43°C. That preheated water then goes to the final-rinse booster, which ensures a minimum final-rinse temperature of 180°F/82°C to sanitize clean wares.

The guide includes an operation section covering indicator lights and exhaust blowers, as well as separate sections for operation logic and the electrical schematic. The available material identifies these topics and lists related control components, but does not include the light meanings, operating sequence or blower-control instructions. Refer to the complete manual for those procedures.

Applications

The HRU is intended for use in a commercial dishwasher installation that uses a final-rinse booster. Its documented role is to preheat the dishwasher’s incoming water and supply that preheated water to the booster. This arrangement is relevant to commercial kitchens operating a high-temperature dishwasher; the supplied sources do not identify particular dishwasher models as compatible.