Plumbing / Piping Overview

Most factory-supplied electrical components are prewired. To determine what electrical accessories require additional field-wiring, refer to the unit-specific wiring diagram located on the inside of the control center access door.

The low voltage control circuit is 24 VAC and control wiring should not exceed 0.75 ohms.

Control wires should not be run inside the same conduit as that carrying the supply power. Make sure that field-supplied conduit does not interfere with access panel operation. All low voltage wiring should be run in conduit wherever it may be exposed to the weather.

If wire resistance exceeds 0.75 ohms, an insulator relay should be added to the unit control center and wired in place of the remote switch (typically between terminal blocks R and G on the terminal strip. The relay must be rated for at least 5 amps and have a 24 VAC coil. Failure to comply with these guidelines may cause motor starters to “chatter” or not pull in which can cause contactor failures and/or motor failures.

Discharge Air Temperature Sensor

WARNING

Discharge air temperature sensor is to be field- installed prior to unit start-up.

The sensor is to be installed at least three duct diameters downstream of the heat exchangers or where good mixed

average temperature occurs. All other sensor and low voltage devices are connected to the low voltage terminal strip in the control center. This discharge air sensor is shipped loose and can be found in the unit’s control center. See the unit- specific wiring diagram for connection locations.

Condensate Drain Trap

This unit is equipped with a stainless steel condensate pan with a stainless steel connection. It is important that the drain connection be fitted with a P trap to ensure proper drainage of condensate while maintaining internal static pressures.

A P trap assembly (kit) is supplied with each unit and is to be assembled and installed as local conditions require and according to the assembly instructions provided with the P trap. If local

and area codes permit, the condensate may be drained back onto the roof, but a drip pad should be provided beneath the outlet. If local and area codes require a permanent drain line, it should be fabricated and installed in accordance with Best Practices

and all codes. In some climates, it will be necessary to provide freeze protection for the P trap and drain line. The P trap should be kept filled with water or glycol solution at all times and it should be protected from freezing to protect the P trap from damage. If severe weather conditions occur, it may be necessary to fabricate a P trap and drain line of metal and install a heat tape to prevent freezing.

16Model ERCH-HP Energy Recovery Unit

473501 specifications

Greenheck Fan 473501 is a significant player in the world of ventilation solutions, specifically designed to meet the increasing demands for efficiency and effectiveness in air movement. This commercial-grade fan is particularly noted for its high performance and reliability, making it a top choice for various applications, ranging from industrial settings to larger commercial spaces.

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