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Appendix E
Flowmeter Assembly (FM-1500 N)
WARNING
TO PREVENT SERIOUS INJURY, DO THE FOLLOWING
1.
ALWAYS WEAR
gloves, goggles, and other necessary
equipment when handling NH3 apparatus.
2.
DO NOT
cross thread. Use anti-seize lead base thread
compound.
3.
THOROUGHLY BLEED
hoses before disconnecting NH3
apparatus.
4.
COMPLETELY EVACUATE
NH3 apparatus before
servicing.
IMPORTANT:
Opening the flowmeter will void the Flow
Calibration value assigned to your unit. However, you may
need to take the flowmeter apart for periodic cleaning or to
remove an obstruction.
See Illustration 18
.
TO REMOVE THE FLOWMETER
Loosen two 1/2” bolts securing unit (shutoff valve end) to
tool-bar. Loosen union between flowmeter and shutoff
valve. Slide shutoff valve away from flowmeter and unscrew
flowmeter from heat exchanger.
Assemble in reverse order.
Complete assembly
FM1500 N Flowmeter
P/N 14348
TO DISASSEMBLE THE FLOWMETER
Remove retainer clip from one end and slide out internals.
See Illustration 19.
Be careful not to bend turbine shaft.
Clean and inspect parts.
After assembly, shaking flowmeter end-to-end should
produce a “rattling” sound (shaft end play). Blowing into
the meter from either end should cause the turbine to spin
freely. If the turbine only spins from one direction, install
the flowmeter so that liquid flows that direction.
If turbine does not spin freely, flowmeter may require repair.
Turbines and bearing replacement kits are available.
Before reconnecting the union, loosen all six 3/8” carriage
bolts at bottom of mounting bracket uprights. Tighten
union then re-tighten 3/8” carriage bolts. This ensures that
unit sits flat on tool bar and does not “teeter” on center
bracket.
Start with original calibration number and follow procedure
in Appendix B to fine-tune the calibration.
Illustration 18
Retainer clip
Sensor bracket
Flowmeter housing
Bearing housing
Bearing housing
Sleeve
Turbine
Retainer clip
Screws
