KE2 Therm Solutions 20844 User Manual

© Copyright 2017 KE2 Therm Solutions, Inc., Washington, Missouri 63090
Q.1.3 November 2017
Page 2
KE2 EvaporatorEfciency
Quick Start Guide
Subcooling - There should be a solid column of liquid at the inlet of the valve.
This can be veried by looking at the sight glass, however, the proper method
requires measuring the subcooling of the liquid entering the valve.
Verify Temperature Dierence
A typical Temperature Dierence (TD) between the coil temperature and the
air temperature is between 5 and 15°F. An insucient TD, between the coil
and air temperature, indicates a system issue that needs to be addressed be-
fore installing the KE2 Evap.
Understanding Frost
The air exiting side of the evaporator is often the coldest spot on the coil due
to the load aecting the temperature. As air travels through the ns of the
evaporator, the Relative Humidity will reach 100%. Moisture will begin to
drop out of the air, and deposit on the coil surfaces to form frost. Although
frost typically has a negative connotation when discussed in refrigeration, ini-
tial frost formation has a positive eect, due to increased surface area of the
tubes, which increases air velocity through the ns. It is not uncommon to see
a small amount of frost on the coils that have KE2 Evap controllers installed.
The KE2 Evap is continually measuring, monitoring, and managing the frost
to assist in maximum energy eciency. When the eciency of the coil is re-
duced due to excessive frost, the KE2 Evap will initiate a defrost.
Arriving at the Jobsite
When arriving at any jobsite, it is good practice to verify the correct operation
of the system. Even systems running for a considerable amount of time with-
out requiring a service call may not be running properly.
Inspect the coil to see the current frost pattern. If the unit has not recently
performed a defrost, look for the heaviest area of frost. This will be used to
locate the coil sensor.
Installers should account for a full system diagnostic in the installation esti-
mate for the controller.
Although it may seem unnecessary, identifying system issues before the con-
troller is installed will save time overall. It will also allow the controller to pro-
vide the highest energy savings.
Verify the system is running correctly. Taking several measurements will help
determine the current health of the system.
Two of the most critical indicators of system health are the superheat
and subcooling.
Superheat - Superheat is the most overlooked ineciency in existing sys-
tems. Typically the superheat on a mechanical thermostatic expansion valve
(TEV) is set when there is no product in the controlled space, if it is set at all.
When applying the controller to an existing system with a mechanical ex-
pansion valve, the superheat should be set to the manufacturer’s recom-
mendation. With an electronic expansion valve (EEV), lower superheat and
improved eciency can be maintained.
KE2 EvaporatorEfficiency
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KE2 EvaporatorEfficiency
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At the entrance
On the wall
On the evaporator
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Determining Controller Location
The controller is designed to be as versatile as possible, and can be installed
inside or outside the controlled space. The location of the controller should
be discussed with the end user to determine if they have a preference, and
in a location convenient for installation by the service provider. Locating the
controller at the entrance to the space typically does not increase the com-
plexity of the wiring, merely the length of the wires.
The controller can also be located at the condenser, but should not be in-
stalled outdoors without an enclosure to protect it from sunlight and mois-
ture (must be within operating range -40°F to 140°F (-40°C to 60°C)

KE2 Therm Solutions 20844 Specifications

General

Brand	KE2 Therm Solutions
Model	20844
Category	Controller
Language	English