Technical data

16
Accessories
Figure 10 Emergency water switchover—optional
Table 8 Emergency water switchover (EWS) Data
EWS Model Number EWS05 EWS10 EWS20
Nominal Flow Rate - GPM (l/m) 5 (19) 10 (38) 20 (76)
Pressure Drop - Ft of water (kPa) 8.0 (23) 14.0 (41) 15.2 (44.5)
Minimum Flow Setting (adj) - GPM (l/m) 1.5 (5.7) 4.2 (16.0) 5.8 (22.0)
Maximum System Pressure - PSI (kPa) 100 (125) 100 (125) 100 (689)
Connections NPT male NPT male NPT male
A Supply from Chiller 3/4" 1" 1-1/4”
B From Emergency Water Source 3/4" 3/4" 3/4”
C To Open Drain 3/4" 3/4" 3/4”
D Return to Chiller 3/4" 1" 1-1/4”
E Supply to Load 3/4" 1" 1-1/4”
F Return from load 3/4" 1" 1-1/4”
NOTE
1. EWS is not for use with glycol systems.
2. The drain line must be piped to an open drain for the valve to operate properly.
3. Water pressure required must be greater than the sum of the EWS pressure drop,
piping pressure drop, and load pressure drop
Table 9 EWS electrical data—EWS05, EWS10 and EWS20
Input Voltage 120V / 60 Hz 220V / 50 Hz
Input Amps 0.6A 0.8A
Maximum Supply Circuit Ampacity 0.7A 1.0A
Maximum Fuse or Circuit Breaker Size 15A 15A
Table 10 Clearance requirements
Top: 24"
Left: 12"
Right: 24"
Front: 36"
36.00
4.50
3. 0 0
12.00
3. 0 0
Push But t o n
Power Switch
Copper Piping
Temperat ur e Display
Te mperature
Set Poi nt But t on
Pressure Gauge
30 . 0 0
Toggl e Switch
Val ve Handle
Temperature
set point button
Power switch
Toggle
switch
Push button
Copper
piping
Pressure
gauge
Temperature
display
Valve
handle
3"
30"
36"
4.5"
12"
3"
6"
6"
6"
22.5"
1.25"
8"8"8"
3"
4.5"
18"
RIGHT REAR LEFT