EVAPCO LSWE User Manual

26
F
reeze Protection of Closed Circuit Cooler Coils
The simplest and most effective way of protecting the heat exchanger coil from freezing is to use an inhibited ethylene or propylene
glycol anti-freeze. If this is not possible, an auxiliary heat load and minimum flow rate must be maintained on the coil at all times so that
the water temperature does not drop below 50°F when the cooler is shut down. See Table 6 for recommended minimum flow rates.
I
f an anti-freeze solution is not used, the coil must be drained immediately whenever the pumps are shut down or flow stops. This is
accomplished by having automatic drain valves and air vents in the piping to and from the cooler. Care must be taken to ensure that the
piping is adequately insulated and sized to allow the water to flow quickly from the coil. This method of protection should be used only in
emergency situations and is neither a practical nor recommended method of freeze protection. Coils should not be drained for an
e
xtended period of time, as internal corrosion may occur.
When the unit is in operation during freezing weather, some type of capacity control is normally required in order to keep water
temperatures from dropping below 50°F. Operating dry with a remote sump is an excellent way of reducing unit capacity at low
temperatures. Other methods of capacity control include two-speed motors, VFDs and fan cycling. These can be used individually or in
combination with dry/remote sump operation.
Closed Circuit Cooler
Standard Flow Series Flow
Footprint
GPM GPM
ATWB Products, eco-ATW & eco-ATWE
3’x3’** — 26
4’ wide units** 74 37
7’ wide units 140 70
8.5’x7.5’ 148 74
8.5’x9’ to 8.5’x21’ 160 80
17’x12’, 17’x14 320 160
10’x12’, 10’x18’ 188 94
10’x24, 10’x36’, 20’x12’, 20’x18’ 376 188
20’x24’, 20’x36’ 752 376
12’x12’, 12’x14’, 12’x18’, 12’x20’ 232 116
12’x24’, 12’x28’, 12’x36’, 12’x40’ 464 232
24’x12’, 24’x14’, 24’x18’, 24’x20’ 464 232
24’x24’, 24’x28’, 24’x36, 24’x40’ 928 464
LRWB Products
3’ wide units 60 30
5’ wide units 94 47
8’ wide units 148 74
LSWE Products
4’x6’, 4’x9’, 4’x12’, 4’x18’ 66 30
5.5’x12’, 5.5’x18’ 94 47
8’x12’, 8’x18’ 148 74
8’x24’, 8’x36’ 296 148
10’x12’, 10’x18’ 188 94
10’x24, 10’x36’ 376 188
ESWA Products
8.5’x9’, 8.5’x12’, 8.5’x18’ 237 119
12’x12’, 12’x18’ 330 165
ESW4 Products
8.5’x6’-LP 100 50
8.5’x9’, 8.5’x12’, 12’x12’-LP, 12’x12’-SP 160 80
8.5’x18’, 12’x12’-LF, 12’x12’-SF, 12’x18’-LF, 12’x18’X-SF 240 120
12’x18’X-LP, 12’x18’X-SP 320 160
12’x18’X-LF, 12’x18’X-SF 480 240
14’x22’ 440 220
Minimum Flows
Table 6 - Closed Circuit Cooler Minimum Recommended Flow Rate
** Not available as eco-ATWE

EVAPCO LSWE Specifications

General

Brand	EVAPCO
Model	LSWE
Category	Cooling boxes
Language	English