Technical information

C6.1.7/0609-1110/E 5
2.7.3 Electrical box components
All electrical components are pre-wired into the panel. The panel contains:
 Compressor contactor(s)
 Fuse(s)
 Terminal blocks
 DIN rail-mounted terminals
 Alarm relays
 Electronic controller
NOTE: For further information, please refer to the application guideline C6.1.3
"Condensing Unit Controller for Copeland EazyCool™ Outdoor Condensing Units" available on
www.emersonclimate.eu.
2.7.4 Pressure switch
Single-compressor units are equipped with:
 Dual pressure switch with automatic reset ALCO PS2-W7A
 Electronic unit controller EC2-552 with HP and LP pressure transmitters
Two-compressor units are equipped with:
 Single low-pressure switch with automatic reset ALCO PS1-W3A
 Two high-pressure switches with automatic reset ALCO PS3-W4S
 Electronic unit controller EC2-552 with HP and LP pressure transmitters
1) PS2-W7A: Alco Controls dual pressure switch with automatic reset (for single-
compressor unit)
The switch is equipped with display scale and pointers to indicate the
approximate settings. The display scales are printed in relative pressure
units “bar” and “psi”.
For precise setting of the control, external gauges must be used.
The PS2-W7A has the following characteristics:
 Adjustable dual pressure switch
Set point adjustment range: LP (left) = -0.5 to 7 bar and HP (right) = 6 to 31 bar
Differential adjustment range: LP = 0.5 to 5 bar, HP = 4 bar
Factory setting: LP = 3.5 / 4.5 bar, HP = 20 bar
NOTE: The HP value should be set at maximum 26.2 bar (according to EN 12263).
2) PS1-W3A: Alco Controls single low-pressure switch with automatic reset
The control is equipped with display scale and pointers to indicate the
approximate settings. The display scales are printed in relative pressure units
“bar” and “psi”.
For precise setting of the control, external gauges must be used.
The PS1-W3A has the following characteristics:
 Adjustable single pressure switch
Set point adjustment range: = -0.5 to 7 bar
Differential adjustment range: = 0.5 to 5 bar
Factory setting: = 3.5 / 4.5 bar
3) PS3-W4S: Alco Controls high-pressure switch with automatic reset
 Fixed switch point settings
Cut-out point: 26.2 bar
Cut-in point: 22 bar
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