22
If you have a positive displacement pump or a cen trif u gal
pump capable of generating excessive pressure, you must
in stall a pressure relief valve and adjust it to a safe max i-
mum pressure. If a positive dis place ment pump is operated
without a pressure relief valve, damage may re sult to pump
or other plumbing component.
See Illustration to the right.
Range Adjust Valve
With oversized pumps, it may be necessary to install a range
adjust valve. The range adjust valve will reduce the pump’s
output to the rest of the system.
Ad just ment of this valve
is covered in the Pre-Field System Checkout, pages 38-39.
See Illustration to the right.
Servo, Throttling Valves
For
BYPASS
installations, the servo valve installs in an
unrestricted return line to the inlet of the pump or directly
into the tank. The console must be calibrated for bypass
operation,
see Calibration Section.
DO NOT
install the servo
valve closer than 12” to the flowmeter. The servo valve has a
flow direction decal on it. Make certain that the actual flow
direction matches the decal on the servo valve.
DO NOT
install the servo valve in the agitation line. Slow response
time and marginal operation may result. The return line
should tee from the main line just after the throttling valve.
See Illustration to the right. The throttling valve is used to
limit the output (set maximum output) of the pump to the
flowmeter and servo valve. The throttling valve is adjusted
to put the servo valve in its optimal operating range.
Please
refer to Pre-Field System Checkout on pages 38-39 for proper
valve adjustment procedure.
The servo valve connects directly to the 3-pin connector on
the main harness. If more length is required, use a 3-pin W/P
extension cable of the appropriate length.
IMPORTANT NOTE: If using the MT-3405D with an old style
Micro-Trak servo valve, the valve voltage must be set to 8
volts.
See Special Calibration Valve Voltage section on page
31.
NOTE:
The servo valve may be installed in the main spray
line as shown in
Illustration 10.
For in-line installations, you
will need to calibrate the system for
INLINE
operation,
see
page 28.
For positive displacement pumps
For oversized pumps
Tee “C”
Tee “A”
Pressure
Relief Valve
Tee “C”
Range
Adjust Valve
Tee “A”
Installation
(cont)
Manual Pressure Relief Valve
Return to pump
inlet or unrestricted
return to tank
Servo Valve Cable
From Pump
Throttling Valve
To Flowmeter
Servo Valve
BYPASS
Servo
Flowmeter
From Pump
INLINE
Содержание DUAL CONTROL MT-3405D
Страница 1: ...REFERENCE MANUAL DUAL CONTROL AUTOMATIC RATE CONTROLLER MT 3405D ...
Страница 47: ...Appendices 47 ...
Страница 56: ...P N 14366 56 Appendix F cont MT 3405D NH3 Specific cont MT 3405D Wiring Diagram for NH3 Channel 1 ...
Страница 82: ...82 NOTES ...
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