Evoqua Wallace&Tiernan 50-200 Series, Manual

Page: 33 / 111

WT.050.200.001.UA.IM.0814
50-200 EVAPORATOR FOR CHLORINE
22
EVOQUA W3T98237
3.1 Preparation For Initial Operation
3.1.1 Controls
WARNING: FOR YOUR SAFETY AND THE SAFETY OF ALL PLANT PERSON-
NEL, READ AND UNDERSTAND THIS ENTIRE PREPARATION PROCEDURE
AND FAMILIARIZE YOURSELF WITH THE CHLORINE HANDLING MANUAL
BEFORE PERFORMING ANY WORK.
a. Turn on the water supply to the solenoid valve.
WARNING: TO AVOID SEVERE PERSONAL INJURY OR EQUIPMENT
DAMAGE, USE ONLY WATER TO FILL THE HOT WATER TANK AND HEAT
EXCHANGER. DO NOT USE ANY SUBSTITUTE FLUID. THE BOILING
TEMPERATURE OF WATER PROVIDES A LIMIT ON AN ACCIDENTAL
OVER-TEMPERATURE CONDITION, THEREBY LIMITING THE GAS PRES-
SURE INSIDE THE EVAPORATOR CYLINDER.
NOTE: Water supply pressure must be 10 psi minimum.
b. Turn the power switch located on the front of the control box to ON. The
solenoid valve in the water supply line will be energized and opened,
admitting water to the hot water tank, pump, and heat exchanger. The
LOW WATER LEVEL alarm light on the control box will go out when the
water level reaches a point just above the bottom of the sightglass. At
this point the circulating pump will switch on. The coil in the contactor
for the heat exchanger will be energized, resulting in the raising of the
temperature of the water bath. When the water level reaches normal
operating height, 2/3 to 3/4 of the height of the sightglass, the water
level control switch will de-energize the solenoid valve and shuts off the
water supply.
c. Check to see that the low water temperature alarm switch, labeled TS3-
LOW, is set to actuate at 160°F (+10°, -5°). This switch is factory calibrated.
No adjustment is necessary.
Below the tank water temperature of 160°F, the LOW TEMPERATURE
alarm light on the control box will stay on. When the temperature reaches
160°F (+10°,-5°) the low temperature switch will close, causing the vacuum
regulator-check unit (or gas pressure reducing valve) to open.
d. The water bath will reach operating temperature about 45-60 minutes
after start-up, depending on initial water temperature and heater ca-
pacity. The water bath temperature is controlled electronically by the
printed circuit board. The control circuitry has been factory-calibrated
to maintain the water temperature at approximately 180°F; adjustments
are not required.
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