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34
Ecos
aire
®
July 2007
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 con-
centration for your area since
increased concentrations reduce heat
exchange efficiency. These concen-
trations and corresponding freeze
temperatures are listed in the table
included here.
IMPORTANT!
Use only an inhibited ethylene
glycol suitable for HVAC applica-
tions, such as Dowtherm SR-1 or
equivalent. DO NOT use automo-
tive antifreeze since it may dam-
age components.
All glycol-cooled and FreeCool
data is based on forty-percent gly-
col by volume.
If possible use a pre-mixed
glycol/water solution. Where this is
not possible, mix the solution by vol-
ume in a clean non-galvanized con-
tainer.
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 reach-
es the port. The core of the access
valve on the glycol-cooler inlet head-
er must be held open or temporarily
removed.
Pour the glycol mixture into the sys-
tem fill port until full.
E
cos
aire
®
EC 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
or Free-Cool
Model No.
CM
010
CM
015
CM
020
CM
030
CM
050
CM
070
CM
080
CM
100
Room Unit
Expansion Tank
0.19
1.0
0.21
1.0
0.25
1.0
0.33
1.0
0.39
1.0
0.43
1.0
0.51
1.0
UNIT INTERNAL VOLUMES (GALLONS)
0.17
1.0
DDM18 - 2.0 Gallons
DDM28 - 4.1 Gallons
DDM32 - 4.1 Gallons
DDM39 - 5.8 Gallons
DDM63 - 8.5 Gallons
DDM70 - 8.5 Gallons
Glycol-Cooler Internal Volumes
Installation Piping Glycol Filling
Glycol-Cooled Direct-Expansion, Glycol-Cooled DualCool, & FreeCool Units Only
INST
ALLA
TION