moyno 20302, Service Manual

Page: 9 / 40

Section:
MOYNO
®
500 PUMPS
Page:
1
of 4
Date:
March 1, 1998
DESIGN FEATURES
Housing:
Cast iron/316 SS
Pump Rotor:
Chrome plated AISI 416 stainless steel/Chrome
plated 316 stainless steel
Pump Stator:
NBR (Nitrile)
Seal:
Mechanical (carbon/ceramic)
Motor Shaft:
AISI 416 stainless steel/ANSI 316 stainless
steel
Motor:
1/2 HP, 60 Hertz, 1725 rpm, totally enclosed,
fan cooled (TEFC) C-Faced, 1 phase 115/230V
or 3 phase 230/460V (other motor options
available; consult sales representative)
Note: Alternate elastomers available. Refer to
Repair/Conversion kit numbers pages 3 and 4.
INSTALLATION
Mounting Position. Pump may be mounted in any
position. When mounting vertically, it is necessary to keep
bearings above seals to prevent possible seal leakage into
bearings.
Pre-Wetting. Prior to connecting pump, wet pump elements
and mechanical seal by adding fluid to be pumped into
suction and discharge ports. Turn pump over several times
in a clockwise direction to work fluid into pump elements.
Piping. Piping to pump should be self-supporting to avoid
excessive strain on pump housings. See Table 1 for suction
and discharge port sizes of each pump model. Use pipe
“dope” or tape to facilitate disassembly and to provide seal
on pipe connections.
Electrical. Follow the wiring diagram on the motor
nameplate or inside the terminal box for the proper
connections. The wiring should be direct and conform to
local electrical codes. Check power connections for proper
voltage. Voltage variations must not exceed ±10% of
nameplate voltage. Motor is provided with internal
automatic overload protection.
To prevent damage to pump, pump rotation must be
clockwise when facing pump from motor end.
OPERATION
Self-Priming. With wetted pumping elements, the pump is
capable of 25 feet of suction lift with pipe size equal to port
size. Be sure suction lines are air tight or pump will not self
prime. Self-priming capabilities will vary due to fluid
viscosity.
DO NOT RUN DRY. Unit depends on liquid pumped for
lubrication. For proper lubrication, flow rate should be at
least 10% of rated capacity.
Pressure and Temperature Limits. See Table 1 for
maximum discharge pressure of each model. Unit is
suitable for service at temperatures shown in Table 2.
Storage. Always drain pump for extended storage periods
by removing bottom drain plug in pump body.
Caution: Suction pressure should never be greater than
discharge pressure.
Table 1. Pump Data
Pump
Model
Suction
Port
(NPT)
Discharge
Port
(NPT)
Voltage
Rating
(VAC)
Discharge
Pressure
(psig)
331 3/4 3/4
See Motor Name
Plate For
Voltage Ratings
150
332 3/4 3/4
See Motor Name
Plate For
Voltage Ratings
100
333 3/4 3/4
See Motor Name
Plate For
Voltage Ratings
50
344 3/4 3/4
See Motor Name
Plate For
Voltage Ratings
†30
†With
3/4
HP
motor, pressure is
40
psig.
Table 2. Temperature Limits
Elastomer Temperature Limits
*NBR 10°-160°F
*EPDM 10°-210°F
*FPM 10°-240°F
*NBR = Nitrile
EPDM = Ethylene-Propylene-Diene Terpolymer
FPM = Fluoroelastomer
SERVICE MANUAL
MOYNO
®
500 PUMPS
300 SERIES MOTORIZED
331, 332, 333, AND 344 MODELS