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If the condenser cooling water is not being used
as drinking water or is not re-circulated in a
closed or tower system, neutralizing is not
necessary.
11. Put the unit back in service and operate under
normal load. Check the head pressure. If normal, a
thorough de-scaling has been achieved.
What You Can Do For Further Help:
Contact the Engineering and Service Department of
the OAKITE PRODUCTS CO., 19 Rector Street, New
York, NY 10006 U.S.A. for the name and address of the
service representative in your area.
4.22
CHECKOUT PROCEDURE FOR
OPTIONAL POWER TRANSFORMER
If the unit does not start when connected to a 190/230
vac power supply, check the following:
a. Make sure circuit breaker (CB-2) is in the ON
position. If CB-2 does not hold in, check voltage supply.
b. Check to see if the transformer internal protector
(IP-AUTO-TRANS) is closed. Allow a reasonable length
of time for transformer to cool down. The transformer
includes two (2) internal protectors. Only one is wired
into the system as the second protector is a spare.
c.
To Check for Continuity Across the Internal Protector
(IP-AUTO-TRANS):
1. Turn power OFF and disconnect power source.
2. Disconnect white wires 1 and 2 from terminal
board.
3. Check for continuity across the internal
protector (IP). If (IP) is open and will not reset, connect
wires 3 and 4 (18 gauge) to terminal board. Check to see
if unit will start.
d. If the internal protector and circuit breakers (CB-1
and CB-2) are good, check the transformer. Use a
voltmeter and with the primary supply circuit ON check
the primary (input) voltage (230 vac). Next, check the
secondary (output) voltage (460 vac) at the voltage
selector switch. The transformer is defective if voltage is
not available.
4.23
TEMPERATURE CONTROLLER AND
RECORDER SENSOR CHECKOUT
PROCEDURE
a.
Place the sensor (sensing bulb) in 0_C (32_F) ice-water
bath. Ice-water bath is prepared by filling an insulated
container (of sufficient size to completely immerse bulb)
with ice cubes or chipped ice, then filling voids between ice
with water, and agitating until mixture reaches 0_C (32_F)
as shown by a laboratory thermometer.
b. Start unit and check air temperature/data readout on
the microprocessor control panel. You should have a
reading of 0_C (32_F); if not, continue on to the
following step.
c.
Turn unit OFF and disconnect power supply.
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d. Remove
two
Microprocessor Control Panel.
e. Remove three screws and loosen three other screws
to remove cover (Item 3, Figure 4-26).
f.
In the box there are wires marked supply and return.
Follow the wire to the plug connector and using the pins
of the plug, measure the ohms resistance. Readings are
shown in Table 4-4.
4.23.1 Replacing Temperature Sensor
a. Turn unit power OFF and disconnect power supply.
b. Cut cable 2 inches from shoulder of defective sensor
and discard defective probe.
c.
Cut one wire of existing cable 41 mm (1-5/8") shorter
than the other wire. (See Figure 4-19.)
SENSOR
SHOULDER
Figure 4-19. Sensor
d. Cut one replacement sensor wire (opposite color)
back 41 mm (1-5/8").
e. Strip back insulation on all wiring 6.35mm (1/4").
Do not allow moisture to enter wire splice area as
this may affect the sensor resistance.
f.
Slide a large piece of heat shrink tubing over the
cable and the two small pieces of heat shrink tubing over
the wires before adding crimp fittings as shown in
Figure 4-20.
g.
Slip crimp fittings over dressed wires (keep wire
colors together). Make sure wires are pushed into crimp
fittings as far as possible and crimp with crimping tool.
h. Solder spliced wires with a 60% tin and 40% lead
Rosincore solder.
i.
Slide heat shrink tubing over splice so that both ends
of tubing cover both ends of crimp as shown in
Figure 4-20.
SENSOR
CABLE
LARGE HEAT SHRINK
TUBING (1)
Figure 4-20. Sensor and Cable Assembly
j.
Heat tubing, preferably with a flameless heat gun. If
not available, a propane torch will work (caution should
be taken not to burn the heat shrink tubing or wire
4-15
capscrews
and
lower
41mm (1-5/8)
6.35mm (1/4)
CAUTION
HEAT SHRINK
TUBING (2)
the
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