KE2 21710 Quick Start Manual

KE2 Compressor Sequencer
Quick Start Guide
This reference should remain on site with the installed KE2 Compressor Sequencer
Application:
▪ Designed for small to mid-sized racks - eliminates overly
complicated controls that are designed for larger systems.
▪ Easily applied to new or existing installations.
▪ Supports up to 5 stages of loading with onboard relays.
▪ On racks with compressors all of equal HP, will automatically
equalize runtime
▪ Racks with compressors of varying HP, it maintains consis-
tent suction pressure.
▪ Master View webpages, allows technicians to quickly and
easily assess the system's operation & Review historical per-
formance using onboard data logging.
▪ Works as a stand-alone rack controller or in conjunction with
KE2 Evaporator Efficiency controllers.
▪ Can limit the amount of defrost load, as dictated by the site's
electrical requirements.
The KE2 Compressor Sequencer is new to KE2 Therm's refrigeration con-
trols suite. Designed for small to mid-sized racks, The KE2 Compressor
Sequencer brings the controller's features in line with the job's require-
ments. It eliminates the necessity of using overly complicated controls
designed for larger systems.
The KE2 Compressor Sequencer replaces aging rack controllers or can
retrofit racks with existing mechanical controls.
The controller supports up to 5 stages of loading through its onboard
relays. Each relay can be configured as the rack's: Fixed Speed Compres-
sor, Compressor Unloader, Digital Scroll Compressor, Master Liquid Line
Solenoid, or Hot Gas Defrost Relay.
When applied to racks with compressors all of equal horse power, the
controller will automatically equalize the runtime of each compressor.
Compressors can also be of various HP. When more than one HP is se-
lected the controller will use the stage with the smallest capacity, to
maintain consistent suction pressure.
The KE2 Compressor Sequencer includes KE2 Therm's Master View web-
pages, allowing technicians to quickly and easily assess the system's
operation, and review historical performance through onboard data
logging.
The compressor sequencer works as a stand-alone rack controller or in
conjunction with KE2 Evaporator Efficiency controllers. When applied
with the KE2 Evaporator Efficiency controllers the KE2 Compressor Se-
quencer can limit the amount of defrost load, as dictated by the site's
electrical requirements.
Before you begin:
NOTE:
After the controller is wired, the KE2 Compressor Sequencer is
setup using the controller's onboard webpage.
To access the webpage on the controller you will need a laptop and
Ethernet cable, or a mobile device and either the KE2 LDA communica-
tion device, or the KE2 WiFi Service Tool. (See page 3)
© Copyright 2018 KE2 Therm Solutions, Inc., Washington, Missouri 63090
pn 21710
Parts List - Included
The following are included in the KE2 Compressor
Sequencer kit 21710:
(1) KE2 Compressor Sequencer 120/208-240 VAC
controller
(1) high voltage safety shield
(1) 15' high-temperature sensor
(1) 0-150 psia pressure transducer with 10ft. lead
(1) 0-500 psig pressure transducer with 10ft. lead
(1) 10 ft. temperature sensor for suction temperature
(4) 90 degree quick disconnects
(4) self-tapping screws
(2) course thread screws (1) fine thread machine screw with lock washer
(4) wire ties (rated for high & low temp)
(1) 5-position pluggable connector
(4) 3-position pluggable connectors (for power in, transducer & 3A relay)
(9) 2-position pluggable connectors (for sensors & digital input, analog output)
(1) 120 Voltage jumper
(1) 208-240V Voltage jumper (already installed on controller)
Other Supplies - Not Included
The KE2 Compressor Sequencer installation requires standard truck stock items.
A list of items is provided.
Conduit to go between the controller and the electrical panel
(2) Conduit connectors (straight or elbow as required)
High voltage wires matched to the number of compressors, liquid line so-
lenoid (if used), and the controller
Wire labeling (numbers, colors, etc.)
Additional wire ties
18 gauge twisted shielded pair (if extending sensor wires)
Part Numbers - Controllers & Accessories
Part Number Description
KE2 Compressor Sequencer
21246 Controller only
Pressure Transducers
20201 Pressure Transducer – 0 to 150 psia, 10 ft. leads
20202 Pressure Transducer – 0 to 500 psig, 10 ft. leads
Temperature Sensors
21230 High temp for discharge at condenser inlet, 15 ft.
20199 Standard for all other temp inputs, 10 ft. (black)
Solid State Relay
Solid State Relay for Compressor Sequencer (used to control
21304
5th compressor stage or digital scroll
Q.2.43
April 2018
KE2 WiFi
Service Tool
(pn 20906)
KE2 LDA (pn 21253)