moyno 20302, Service Manual

Page: 37 / 40

Section:
MOYNO ® 500 PUMPS
Page: 1 of 4
Date: March 2002
SERVICE MANUAL
MOYNO ® 500 PUMPS
SANITARY/HYGIENIC MOTORIZED
331, 332, 333 AND 344 MODELS
SANITARY MODELS
These pumps include housings polished to a #4 finish
both inside and out. The Durametallic FRO mechanical seal
has carbon/ceramic faces. The elastomers meet the FDA
requirement for food contact. These pumps meet 3A require-
ments. The universal joint may be dismantled for cleaning.
HYGIENIC MODELS
These pumps provide the quick disassembly features
of the sanitary version for easy cleaning. The housings
are 316 stainless steel construction, however they are
not polished.
These pumps utilize rubber-covered
universal joints. The stators are available in non-FDA
nitrile, EPDM and fluoroelastomers. The mechanical seals
are rubber bellows type with carbon/ceramic faces.
INSTALLATION
Mounting Position. Pump may be mounted in any posi-
tion. When mounting vertically, it is necessary to keep the
motor above the pump to prevent possible seal leakage into
the bearings.
Pre-Wetting. Prior to connecting the pump, wet the pump
elements and mechanical seal by adding fluid to be
pumped into suction and discharge ports. Turn the pump
over several times in a clockwise direction to work fluid
into the pump elements.
Piping. Piping to the pump should be self-supporting to
avoid excessive strain on pump housings.
Electrical. Follow the wiring diagram on the motor name-
plate 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
10% of nameplate
voltage. The motor is provided with internal automatic over-
load protection.
To prevent damage to the pump, pump rotation must be
clockwise when facing the pump from the 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 the pump
will not self prime. Self-priming capabilities will vary due to
fluid viscosity.
DO NOT RUN DRY. The unit depends on liquid pumped
for lubrication. For proper lubrication, the flow rate should be
at least 10% of rated capacity.
Pressure and Temperature Limits. See Table 1 for max-
imum discharge pressure of each model. The unit is suitable
for service at temperatures shown in Table 2.
Storage. Always drain the pump for extended storage
periods by removing the suction housing and stator.
Caution: Suction pressure should never be greater
than discharge pressure.
Table 1. Pump Data
Table 2. Temperature Limits
*FDA Food Grade on Sanitary Models. FDA Fluoroelastomer
not currently available. Call factory.
Pump Models
Discharge
Pressure
(psig) (maximum)
331 332 333 344
150 100 50 40
Elastomer Temperature Limits
*NBR (Nitrile) 10˚-160˚F
*EPDM 10˚-210˚F
FPM (Fluoroelastomer) 10˚-240˚F