Evoqua Wallace&Tiernan 50-200 Series, Руководство пользователя

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50-200 EVAPORATOR FOR CHLORINE
WT.050.200.001.UA.IM.0814
35
EVOQUA W3T98237
exchanger and to indicate the water temperature on the analog meter on the
front of the control box. This circuitry has been factory-calibrated; adjustments
are not required. Refer to the Troubleshooting Guide in case of malfunction.
4.3 High and Low Temperature Switches
This is a dual temperature switch that senses the water bath temperature di-
rectly at the tank. The low temperature switch (TS3-LOW) is set to 160°F; the
high temperature switch (TS2-HIGH) is set to 200°F. The switches are rated for
10 amperes at 120 VAC and 30 VDC. Alarm connections for the switches are
located on the printed circuit board inside the box.
4.4 Relief Systems Pressure Switches
This single-setting pressure sensing device is pre-set for 20 psi at the factory and
requires no readjustment. The switch is rated at 10 amperes for 125 or 250 Vac.
Should the pressure switch (W2T15225) function improperly on either the
liquid line pressure relief system (W3T99062) or the pressure relief system
(W3T97782), proceed as follows:
WARNING: TO AVOID A MAJOR RELEASE OF CHLORINE, CAUSING POS-
SIBLE SEVERE PERSONAL INJURY, DO NOT REMOVE THE PRESSURE RELIEF
SYSTEM WHILE THE EVAPORATOR IS PRESSURIZED. BEFORE ATTEMPTING
TO SERVICE THE PRESSURE RELIEF SYSTEM, FOLLOW STEPS A(1), A(2)
AND A(3) IN PARAGRAPH 4.12.
If after performing steps a1, a2 and a3 in paragraph 4.12, the pressure switch
remains actuated, chlorine under pressure is still present in the pressure relief
system. This indicates a leaking (not ruptured) rupture disc.
WARNING: TO AVOID SEVERE PERSONAL INJURY DUE TO INHALATION
OF CHLORINE GAS, USE AN APPROVED GAS MASK AND VENTILATION
EQUIPMENT WHEN REMOVING THE RUPTURE DISC.
a. Turn off the evaporator controls, alarm unit power supplies, and power to
the alarm circuit being serviced. Ensure that the chlorine supply valve will
remain closed while work is in progress.
b. Remove the front cover from the pressure switch and disconnect the alarm
wiring and electrical conduit from the switch’s terminals.
NOTE: The relief system pressure switch is protected from corrosion by an
oil-filled diaphragm capsule.
CAUTION: Do not disturb the threaded connections between the pressure
switch and this capsule, as a loss of oil will cause the pressure switch to mal-
function or become inopera tive.
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