36
Ecosaire
®
July 2009
After all piping connections have
been completed, the system should
be leak tested by pressurizing it with
air to approximately 50 psig. Check
each joint with soap solution or per-
form a pressure-drop vs. time test.
After testing, the system can be
charged with the glycol/water mix-
ture.
First, determine the proper water-
to-glycol mixture to provide adequate
freeze protection in your area. This
may already have been determined
by a consulting engineer. Do not
exceed the recommended glycol
concentration for your area since
increased concentrations reduce
heat exchange efficiency. These
concentrations and corresponding
freeze temperatures are listed in the
table included here.
IMPORTANT!
Use only an inhibited ethylene
glycol suitable for HVAC
applications, such as Dowtherm
SR-1 or equivalent. DO NOT use
automotive antifreeze since it may
damage components.
All glycol-cooled and FreeCool
data is based on forty-percent
glycol by volume.
If possible use a pre-mixed gly-
col/water solution. Where this is not
possible, mix the solution by
volume in a clean non-galvanized
container.
Open the fill valve and all air vents,
including the petcocks at the top of
the
FreeCool coils
on the right-
hand side of the unit.
The pipe plugs on the pump impeller
housing and at the top of the room
unit inlet and outlet headers should
be carefully loosened to permit air to
escape.
Do not remove the plugs since they
can be difficult to replace once glycol
reaches the port. The core of the
access valve on the glycol-cooler
inlet header must be held open or
temporarily removed.
Pour the glycol mixture into the
system fill port until full.
E
cosaire
®
EN Series Precision Air Conditioner Owners Manual
Data subject to change without notice.
0
10
20
30
40
50
32
25
16
4
-11
-33
9.0
4.0
2.3
1.5
1.0
GLYCOL SOLUTIONS
Percent
Ethylene
Glycol
Solution
Freezing
Point (°F)
Gallons of Water
Per Each Gallon
of Ethylene Glycol
All Water
Glycol-Cooled
Model No.
Brazed-Plate Cond.
Shell & Tube Cond.
EN-027G
EN-035G
EN-042G
EN-051G
EN-068G EN-079G
EN-087G
EN-102G
INTERNAL VOLUMES (GALLONS)
Installation Piping Glycol Filling
Glycol-Cooled Direct-Expansion, Glycol-Cooled DualCool, & FreeCool Units Only
INST
ALLA
TION
GVD122F-F14
5.8
Glycol Cooler
Model @ 95°F
Internal Volume
GVD123F-F21
8.8
GVD124E-F29
11.7
GVD133D-F43
12.9
GVD133E-E26
15.6
GVD134C-F29
17.2
GVD143E-F43
17.1
GVD224E-F58
23.3
0.3
1.2
0.3
1.2
0.4
1.6
0.4
1.6
0.4
1.6
0.4
1.6
0.7
2.2
0.9
3.6
FreeCool
Model No.
Brazed-Plate Cond.
Shell & Tube Cond.
EN-027F
EN-035F
EN-042F
EN-051F
EN-068F
EN-079F
EN-087F
EN-102F
INTERNAL VOLUMES (GALLONS)
GVD122F-F14
5.8
Glycol Cooler
Model @ 95°F
Internal Volume
GVD123F-F21
8.8
GVD124E-F29
11.7
GVD133D-F43
12.9
GVD133E-E26
15.6
GVD134C-F29
17.2
GVD143E-F43
17.1
GVD224E-F58
23.3
5.5
6.4
7.0
7.9
7.1
8.3
7.1
8.3
10.7
11.9
10.7
11.9
11.0
12.5
11.2
13.9
Summary of Contents for EN Series
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