Evoqua Wallace&Tiernan 50-200 Series, Manual

Page: 63 / 111

WT.050.200.001.UA.IM.0814
50-200 EVAPORATOR FOR CHLORINE
52
EVOQUA W3T98237
Table 4.1 - Troubleshooting (Cont'd)
Symptom Probable Cause Corrective Action
Group 5
Low Temperature Panel Light On.
Low Temperature Alarm** (If
Provided) Activates.
Low Reading (Below 160 ° F) On
Panel Temperature Meter.
GPRV* (Or VR-CU) Closed.
Possible Additional Symptom:
Low Water Level Alarm** (If Pro-
vided) and Low Water Level Panel
Light On; See (h) Next Column.
Low tank water temperature as
a result of any of the following
conditions:
(a) Gas demand exceeds evaporat-
ing capacity.
(b) Circulator pump stops or ro-
tates in wrong direction.
(c) Solenoid valve stuck open
admitting cold water into tank.
(Water will be flowing out of over-
flow connection.)
(d) Water leaking out of tank or
piping.
(e) Heater contactor failure: coil
or contacts worn out.
(f) Heat exchanger malfunction:
1, 2 or all 3 elements burn out or
heater is not of the proper voltage
or power rating.
(g) Temperature control circuitry
on circuit board or temperature
sensor in probe housing fails or is
incorrectly wired.
(h) Low water level condition, see
Probable Cause in Group 8.
NOTE: A false alarm condition
would exist if the low tempera-
ture alarm switch is not set to
160°F or a temperature alarm
switch fails.
(a) Reduce gas withdrawl rate.
(b) Check pump motor and wiring.
Correct wiring or replace faulty
equipment.
(c) Check solenoid valve for for-
eign matter jamming valve. Check
water level probe wiring and con-
trol circuit. Replace equipment, if
faulty.
(d) Correct leaks.
(e) Check coil and contacts. Re-
palce faulty equipment.
(f) Check elements and nameplate
ratings. Replace faulty equipment.
(g) Check wiring or replace faulty
equipment.
(h) See Corrective Action for Sys-
tem, Group 8.
Replace temperature switch as-
sembly.
*GPRV - Gas Pressure Reducing Valve; VR-CU - Vacuum Regulator-Check Unit
**Alarms will not activate if customer power fails.