CAMCORP Blower Package with Duroflow Blower - Manual (Page 46)

50-60 Hanover Road, Florham Park, New Jersey 07932
ASCO Valves
Page 3 of 4 Form No.P7050R1
Adjustment
NORMALLY CLOSED NORMALLY OPEN
Procedures Switch
Terminal
Test Lamp
On-Off
Switch
Terminal
Test Lamp
On-Off
1. Starting with zero
signal, connect test
lamp to common.
NC
On
(Closed
Circuit)
NO
Off
(Open
Circuit)
2. Apply desired acĆ
tuation signal. Then
back off signal adjustĆ
ing nut until switch
actuates.
NC
Off
(Open
Circuit)
NO
On
(Closed
Circuit)
3. Lower signal to
check reactuation
signal.
NC
On
(Closed
Circuit)
NO
Off
(Open
Circuit)
5. To adjust high signal setting, repeat steps of adjustment in chart above.
6. Cycle between actuation and reactuation signals and make minor
adjustments to nuts as required to achieve the exact signal setting.
7. After settings have been made, make permanent electrical connections.
Adjustment (Signal Setting) of Normally Closed or
Normally Open Switch, Decreasing Signal (Refer to Figure 3)
1. If the switch is in the line of final application when adjustment (signal
setting) is made, be sure switch can be test operated without affecting
other equipment.
2. On general purpose and watertight constructions, remove switch cover.
3. Turn low signal adjusting nut until low signal setting indictor is fully
down. Then turn high signal adjusting nut until high signal indictor is
fully down. Use a 1/4I wrench for adjusting nuts.
CAUTION: Adjusting nut will turn easily until it hits a stop. Do not
over torque. Over torquing may cause damage.
4. Follow the steps in the chart below to make signal settings. Test one
snap switch at a time. Be sure to start with the high signal side.
Adjustment
NORMALLY CLOSED NORMALLY OPEN
Procedures Switch
Terminal
Test Lamp
On-Off
Switch
Terminal
Test Lamp
On-Off
1. Starting with initial
signal above desired
actuation setting,
connect test lamp to
common.
NC
Off
(Open
Circuit)
NO
On
(Closed
Circuit)
2. Decrease signal to
desired actuation.
Then advance adjustĆ
ing nut until switch
actuates.
NC
On
(Closed
Circuit)
NO
Off
(Open
Circuit)
3. Increase signal to
check reactuation
signal.
NC
Off
(Open
Circuit)
NO
On
(Closed
Circuit)
5. To adjust low signal setting, repeat steps of adjustment in chart above.
6. Cycle between actuation and reactuation signals and make minor
adjustments to nuts as required to achieve the exact signal setting.
7. After settings have been made, make permanent electrical connections.
Testing of Installation
If the adjustment of the switch has been made outside of the line of final
application, the switch should be retested when installed in the line of final
application. Follow adjustment instructions. Be sure switch can be test
operated without affecting other equipment.
MAINTENANCE
WARNING: To prevent the possibility of personal
injury or property damage, turn off electrical power and
depressurize switch unit before inspection or removal.
IMPORTANT: Switch is not field repairable. The switch must be returned
to the factory (Automatic Switch Company, Florham Park, New Jersey) or
serviced only by an authorized factory representative. Address all service
inquiries to Automatic Switch Company, 50-60 Hanover Road, Florham
Park, New Jersey 07932, Valve Service Department. The only maintenance
which may be performed on the switch is changing the setting of the
adjusting nuts and replacement of the transducer unit. Replacement of
transducer should be done only if external leakage is evident.
Preventive Maintenance
S While in service, operate the switch (cycle between desired signals) at
least once a month to insure proper operation. If necessary, electrical
wiring and pipe connection should be made so that switch can be test
operated without affecting other equipment.
S Periodic inspection of the switch, external surfaces only, should be
carried out. Switch should be kept clean and free from paint, foreign
matter, corrosion, icing, and freezing conditions.
S Keep the medium entering the transducer as free as possible from dirt
and foreign material.
Causes of Improper Operation
Switch will not actuate or actuates and reactuates undesirable.
S Incorrect Electrical Connection: Check leads to switch. Be sure they
are properly connected. Switch is marked NO for Normally Open, NC
for Normally Closed and C for Common.
S Faulty Control Circuit: Check electrical power supply to switch. Check
for loose or blown fuses, open-circuited or grounded wires, loose
connections at terminal block or switch. See nameplate for electrical
rating and range.
S Incorrect Adjustment: Check adjustment nuts for proper setting. Refer
to adjustment instructions.
S External Leakage: Check to see that bolts (4) holding transducer to
pressure switch are properly torqued to 80 ± 10 in-lbs [9,0 ± 1,1 Nm].
If bolts are tight and leakage is still evident, replace transducer. Refer
to paragraph on Assembly of Switch Unit and Transducer Unit.
S Excessive Vibration or Surges Causing Switch to Actuate and
Reactuate: Check for fluctuations in system and install pressure surge
suppressor. Check switch mounting and be sure there is no excessive
vibration.
S Incorrect Pressure: Check pressure in system with suitable pressure
gage. Pressure must be within range specified on nameplate.
S Incorrect Temperature: Check temperature in system with suitable
thermometer. Temperature must be within range specified on
nameplate. Check location of capillary and bulb for incorrect mounting.
Refer to paragraphs on Installation of Temperature Transducers.
If the operation of the switch cannot be corrected by the above means, the
entire switch unit should be replaced or an authorized factory representative
consulted.
FOR SERVICE, REPLACEMENT, OR NEW TRANSDUCER
Consult Factory, or Authorized Factory Representative or Distributors
ORDERING INFORMATION
For Two-Stage Fixed Deadband Switch or New Transducer
When Ordering, Specify Catalog Numbers, Fluid, Pressure Range,
Temperature Range, Serial Numbers, and Proof
Pressure or Rated Overrange Temperature.
NAMEPLATES ARE LOCATED ON SWITCH COVER
AND BOTTOM OF TRANSDUCER.