Greenheck Fan 470658 MSX manual Reference, Typical Control Center Layout, Dirty Filter Switch

Reference

Typical Control Center Layout

	10	3	1
			2
			4		5
7	9 11
		15	17
8	12			6
		13		16 14	18

1.	Primary Fuses — provides proper fusing to low	10.	Exhaust Fuses (optional) — provides proper
	voltage transformer.		fusing for exhaust fan motor(s).
2.	Low Voltage Transformer — provides low	11.	Exhaust Motor Starter (optional) — 24 volt
	voltage to controls and optional evaporative		magnetic contacts for starting exhaust motor.
	cooling controls.	12.	Exhaust Overload (optional) — provides
3.	Low Voltage Fuse — provides proper fusing		electronic overload protection to exhaust motor.
	to controls and optional evaporative cooling	13.	Inlet Air Sensor (optional) — outdoor air stat
	controls.		that automatically controls the cooling based on
4.	Control Terminal Block — provides wiring		outdoor air temperature.
	access to controls.	14.	Cooling Relay (optional) — allows power to
5.	Building Freeze Protection Timer (optional) —		pass to cooling controls.
	prevents the discharge of cold air into the	15.	Reset Timer (optional) — resets cooling system
	building.		to run a time interval.
6.	Fan Relay — allows power to pass to energize	16.	Auto Drain Relay (optional) — assures supply
	motor starter.		pump does not operate during drain interval.
7.	Supply Motor Starter — 24 volt magnetic		Allows pump to operate in cooling mode.
	contacts for starting supply motor.	17.	Cooling Timer (optional) — allows for
8.	Supply Overload — provides electronic		automatic draining of the evaporative cooling
	overload protection to supply motor.		system based on time schedule.
9.	Auxiliary Contact (optional) — provides one	18.	Dirty Filter Switch (optional) — monitors filter
	normally closed and one normally open contact		pressure drop, turns on indicating light when
	for other equipment.		pressure drop is above field adjustable set point.

Dirty Filter Switch

Common

Normally Open

Normally Closed

CCW to Decrease Trip Point

CW to Increase Trip Point

Negative Pressure

after the filters

Positive Pressure before the filters

® Model MSX Make-Up Air 37