© Copyright 2017 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.1.27 February 2017
Installing the KE2 Therm Door Switch
Conguring Ethernet Enabled Controllers: KE2 Evaporator Eciency, KE2 Evap for Rack Eciency &
KE2 Controlled Environment
Conguring Non-Ethernet Enabled Controllers: KE2 Low Temp & KE2 Adaptive Control
Door Switch - Specications - pn 20543
Contact 22AWG
Contact Rating 10VA
Contact Type Normally Open
Max Carry Current 2 Amp
Max Switching
Current .5 Amp
Breakdown Voltage 250 VDC
Operating Gap 2 inches (5 cm)
Temperature Range 32°F to 120°F (0°C to 49°C)
Housing Material solid aluminum housing
Cable Length 24” (61 cm) stainless steel armored cable
Certications UL and ULC listed
Basic Description
Designed to withstand rugged
high trac installations, the door
switch provides increased energy
eciency, more stable product
temperature, and is eective at
preventing coil freeze ups. The reed
switch is hermetically sealed with
a PVC shock absorber, enclosed
within a solid aluminum housing.
Installation wires are protected in a
24” (61 cm) stainless steel armored
cable. The magnet is mounted on
an adjustable L shaped bracket
providing greater exibility,
universal mounting, higher pulling power, and a professional
appearance.
L-Bracket
Magnet
Armored
Cable
Contact Assembly
2 ft. (61 cm)
multiple holes
for exibility
when mounting
magnet can be
adjusted forward or
backward in the slot
Attach to
the door
Attach to
the wall
Mounting the Door Switch
The door switch mounts in any position along the door, how-
ever the gap between the magnet Aand the contact assembly/
sensor Bcannot exceed 2”(5 cm) when the door is closed.
If the gap is greater than 2” (5 cm) the door switch will contin-
ually signal that it is open, and the controller will turn o the
evaporators. To help the installer adjust the gap, the L-bracket
has Cmultiple mounting holes, and the magnet can moved
forward, or backward, in the slot D.
Position
Controller Operation with Door Switch Activated
Normal system operation while the door is closed.
When the door is opened, evaporator fans are turned o.
If the door is left open for longer than 60 seconds, the sole-
noid (EEV) is closed to initiate system pumpdown.
System will remain in pumpdown until door is closed.
If the door is left open for time set in Door Alarm Delay (de-
fault is 30 min.) and the temperature rises 5°F (2.8°C) above
setpoint, a Door Alarm is activated and the system is turned
back on to resume cooling
Once the door is closed, normal system operation resumes.
The magnet can mount to the
inside of the L-Bracket or the
outside.
The Contact Assembly / Sensor mounts in any
postion,as long as it is within two inches of the
magnet, when the door is closed.
Side of
Door
KE2 EvaporatorEfficiency
TM
thermsolutions
ENTER
BACK
2
2
L-Bracket &
Magnet Options
Top of Door
