Operating Level Of Water In Cold Water Basin; Water Make Up Valve - EVAPCO ATC-E Operation And Maintenance Instruction Manual

Operating Level of Water in Cold Water Basin

The operating level should be checked monthly to make sure the water level is correct . Refer to Table 3 for unit specific levels .
ATW
ATW
ESWA
ESWA
LSWA
LSWA
LSWA
LSWA
LSWA
LRW
C-ATW
eco-ATW
eco-ATW
eco-ATWE
LSCE
LSCE
LSCE
LSCE
LSCE
LSCE
LSCE
LSCE
LSCE
LRC
ATC
ATC
C-ATC
PMCQ
eco-ATC
* Measured from lowest point on basin floor .
At initial start up or after the unit has been drained, the unit must be filled to the overflow level . Overflow is above the normal
operating level and accommodates the volume of water normally in suspension in the water distribution system and the riser piping .
The water level should always be above the strainer . Check by running the pump with the fan motors off and observing the water
level through the access door or remove the air inlet louver .

Water Make Up Valve

A mechanical float valve assembly is provided as standard
equipment on the evaporative cooling unit (unless the unit has
been ordered with an optional electronic water level control
package or the unit is arranged for remote sump operation) . The
make up valve is easily accessible from outside the unit through
the access door or removable air inlet louver . The make up valve
is a bronze valve connected to a float arm assembly and is
activated by a large foam filled plastic float . The float is mounted
on an all-thread rod held in place by wing nuts . The water level
in the basin is adjusted by repositioning the float and all-thread
using the wing nuts . Refer to Figure 12 for details .
The make up valve assembly should be inspected monthly and
adjusted as required . The valve should be inspected annually
for leakage and if necessary, the valve seat should be replaced .
The make up water pressure for the mechanical valve should be
maintained between 140 and 340 kPa .
Model Number
9 through
64 through
72 through
144 through
20 through
91 and
116 and
135 and
174 and
18 through
67-3H through
0,9 m wide and
2,3 m wide through
2,3 m wide through
36 through
281 through
591 through
400 through
800 through
410 through
820 through
550 through
1100 through
25 through
50E through
M170E through
181 through
316 through
176 through
Table 3 - Recommended Operating Water Level
Operation and Maintenance Instructions
48
866
142
216
87
182
232
270
348
379
133-6J
1,2 m wide
7,3 m wide
7,3 m wide
385
386
770
515
1030
560
1120
805
1610
379
165E
3714E
504
1786
4086
Figure 12 – Mechanical Water Make Up Valve
18
Operating
Level
230 mm
280 mm
280 mm
280 mm
280 mm
300 mm
300 mm
380 mm
380 mm
200 mm
280 mm
230 mm
280 mm
280 mm
280 mm
300 mm
300 mm
300 mm
300 mm
380 mm
380 mm
380 mm
380 mm
200 mm
230 mm
280 mm
280 mm
360 mm
280 mm