Installation, Electrical Connections | Greenheck Fan HRE-90, HRE-20

INSTALLATION (continued)

ELECTRICAL CONNECTIONS

The electrical supply must be compatible with that shown on the nameplate: voltage, phase, and amperage capacity. The electrical supply line must be properly fused and conform to local and national electrical codes.

All internal electrical components are pre-wired at the factory. Field electrical connections only need to be made inside the unit to the main disconnect (See FIGURE 5, Item #1) and the 24 volt control circuit (See FIGURE 5, Item #7). A door interlocking safety disconnect is provided as standard feature.

Note: Standard factory installed electric post heaters have their own disconnect separate from the unit disconnect. Thus, electric post heaters require a separate power connection.

IMPORTANT: Use minimum 14 ga. wire for 24 volt control power.

Control wire resistance should not exceed 0.75 ohms (approximately 285 feet total length for 14 ga. wire; 455 feet total length for 12 ga. wire). If wire resistance exceeds 0.75 ohms, an industrial-style, plug-in relay should be added to the unit control center and wired in place of the remote switch (between terminal blocks 2 and 3 on the control strip — See FIGURE 5, Item #7). 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.

TYPICAL CONTROL CENTER COMPONENTS

1.Main Disconnect

2.Motor Starter — Exhaust/Scavenger Air Fan

3.Motor Starter — Outdoor Air Fan

4.	Motor Contactor — Energy Wheel	1
5.	Control Power Transformer	8
	(24 VAC Secondary)	8
	(24 VAC Secondary)	5
6.	Energy Wheel Motor Transformer	5
6.	Energy Wheel Motor Transformer
	(230 VAC Secondary)	6
	(for HRE-20 & HRE-45 units with	6
	primary voltage greater than 230 Vac)
7.	24 VAC Terminal strip
8.	Fuses for the control circuit, wheel	7
	drive transformer, and blower
	motors.

		4
Control Center	2	3
Off	2	3
On
Main
Disconnect
Intake	FIGURE 5
Hood
Exhaust
Hood

HRE-55, HRE-45, HRE-90, HRE-20 specifications

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