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EcoVision EZ Door Upgrade
TECHNICAL GUIDELINE FOR CASE AND
REFRIGERATION SYSTEM ADJUSTMENTS
Upgrading your existing store with doors
is an excellent way to reduce energy costs.
However, adjustments to your equipment
may be required as a result of adding doors,
because the original equipment was designed
for higher refrigeration loads. Below is a list of
recommended changes that need consideration
for cases, line-ups and the refrigeration system
after upgrading to doors in order to maintain
optimal performance of the refrigeration equip-
ment.
For a detailed analysis and quote of the spe-
cific adjustments needed at your store, please
contact your Hussmann sales representative.
The Hussmann Team will help ensure that your
existing equipment remains at optimal perfor-
mance after the door upgrade.
Oil Return, case performance and product tem-
perature could be negatively impacted without
proper evaluation by a Hussmann Application
Engineer or qualified professional.
CASES
A. Thermostatic Expansion Valve (TXV)/Orifice
Each case may have multiple evaporator
coils, and each evaporator coil has a TXV /
orifice combination. The setting of the super-
heat of each coil is critical to the performance
of the case. The superheat setting on the valve
may require changing to achieve optimal per-
formance of the case.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
The change is likely due to the large decrease
in case load (the existing valve may not have
enough range in its operation to accommo-
date the smaller load). For non-adjustable
valves, add a stem kit. If you have a non-ad-
justable Danfoss valve, it must be changed
to a valve with superheat adjustment. If you
have an adjustable valve, adjust the valve.
Recommended superheat is 4° to 7°.
B. If an electronic TXV is used, no change is
needed.
LINE-UPS
A. Each line-up of cases has a solenoid valve or
Evaporator Pressure Regulator (EPR) by which
to control temperature.
If a solenoid valve is used in either the liquid or
the suction line, more than likely, these will not
have to be changed. An evaluation of the sizing
of these lines is required based on the reduced
load. If they are oversized or undersized by
more than one size, then they should be resized.
The reason for this is that these valves, especially
if they are in the suction line, require a pres-
sure drop in which to operate. If valves are
oversized, this pressure drop may not be strong
enough to actuate the valve. This reduction
in load allows the case saturated suction tem-
perature to run 3° to 6° warmer, therefore it is
recommended that a mechanical or electronic
EPR, per line-up, be utilized to optimize case
performance and increase energy savings. Rear-
load cases must have an EPR added.
P/N 558756_C
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