Essick Air 21 DD, 14 DD Typical Electrical Wiring Diagrams, 110525, Volt, 1 Phase Electric Supply

Typical Electrical Wiring Diagrams

120 Volt, 1 Phase Electric Supply

240 Volt, 1 Phase Electric Supply

Disconnect Switch At Cooler

See Notes 1 & 2

L

H

P

N

Gnd

Fuses

See Note 1

Cooler Cabinet

See Note 3

Equipment Pump Motor

Ground

Blower Motor

Control Contacts

See Note 4

L1	120 Volts
N
	1 Phase
Gnd
	Power Supply

Main Disconnect

See Note 1

•115 Volt single phase blower motor.

•120 Volt pump motor.

•Diagram shown for two speed motor. Low speed circuit drawn with dashed lines is not required for single speed.

Disconnect Switch At Cooler

See Notes 1 & 2

	L
	H
	P
	120V
	L2
	Gnd
	Transformer
	Cooler Cabinet
	See Note 3
Equipment	Pump Motor
Ground
Blower Motor

Control Contacts

See Note 1

L1	208 or 240V
L2
	1 Phase
Gnd
	Power Supply

Fuses

See Note 1 Main Disconnect

See Note 1

•230 Volt single phase blower motor.

•120V pump motor shown. Trans- former may be omitted when a 240V pump is used with a 240V supply

•Diagram shown for two speed motor. Low speed circuit drawn with dashed lines is not required for single speed.

208, 240, or 480 Volt, 3 Phase Blower & 120 Volt 1 Phase Pump & Control Electric Supply

Motor Starter With

Overload Protection Sized

To Match Motor Full Load

Current

See Note 1

T3

T2

T1

Gnd

Disconnect Switch At

Cooler

See Notes 1 & 2

Equipment

Ground

		Gnd	208, 240, or 480V
		L1
		L2	3 Phase
Control Contacts		L3	Power Supply
		Main Disconnects
See Note 4 H
P		See Note 1
		L1	120V
N		N
			1 Phase
Gnd		Gnd
			Power Supply
Fuses
See Note 1
Disconnect Switch At Cooler
See Note 1&2	•	Three phase single speed blower motor
Cooler Cabinet
	•	Three pole motor starter with overload
See Note 3		protection
Pump Motor	•	120V single phase control and pump shown.
		If 240V control and pump are to be used, then
Blower Motor		both legs of power supply must be fused.

Typical Control Contacts Function and Connection

L- Low Fan P - Pump H - Hi Fan

L1 - Supply Power

Function	Connection
Off	None
Pump Only	L1-P
Hi-Cool	L1-H
* Low-Cool	L1-L & L1-P
Hi-Fan	L1-H
* Low-Fan	L1-L

* Omit for single speed blower motor

208, 240, or 480 Volt, 3 Phase Blower Electric Supply With Transformer For Pump & Control

Motor Starter With
Overload Protection
Sized To Match Motor
Full Load Current	Control Contacts
See Note 1
	See Note 4
	H
	P
	Disconnect Switch At Cooler
T3	See Notes 1 & 2
T2
T1	Cooler Cabinet
Gnd
Disconnect Switch At Cooler	See Note 3
See Notes 1 & 2	Pump Motor
Equipment	Blower Motor
Ground

Gnd	208, 240 or 480V
L1
L2	3 Phase
L3	Power Supply

Main Disconnect

See Note 1

120	Fuses
	See Note 1
V

Transformer

See Note 1

•Three phase single speed blower motor.

•Three pole motor starter with overload protection.

•120V single phase pump powered by a transformer. Transformer may be omitted when 240V control & pump are used with a 240V supply.

WARNING: Electrical hookup should be performed by a qualified electrician. All electrical wiring must conform to national and local standards.

NOTE 1. All switches, motor starters, transformers, fuses, junction boxes, receptacles, receptacle boxes, cover plates, and conductors shall be supplied by the installer and must comply with local and national electrical codes.

NOTE 2. The national electric code requires a disconnect switch located at equipment if the main disconnect at equipment controller is not visible from the equip- ment. If more than one disconnect is used they must be mounted adjacent to one another.

NOTE 3. A receptacle for a NEMA 5-15P plug is required for 120V recirculating pump and a receptacle for a NEMA 6-15P plug for 230V pump. NOTE 4. The control contacts may be part of a switch, thermostat or other control device.

4 110525