Armstrong 4300 - System Cleanliness Importance

installation &
operating instructions
Design Envelope 4300 and 4380 vertical in-line
pumping unit with integrated controls
9
2.7 lubrication
Pump
Lubrication is not required. There are no bearings in the pump
that need external lubrication service.
Large Design Envelope 4300 units are installed with a shaft
bushing located beneath the impeller that is lubricated from the
pump discharge.
Motor
Follow the lubrication procedures recommended by the mo-
tor manufacturer. Many small and medium sized motors are
permanently lubricated and need no added lubrication. Gener-
ally if there are grease fittings evident the motor needs periodic
lubrication. None if not.
Check the lubrication instructions supplied with the motor for
the particular frame size indicated on the motor nameplate.
Mechanical Seal
The mechanical seal is fitted with a flush line. The seal is flushed
from discharge of the pump casing on Design Envelope 4300
pumps and from the suction on Design Envelope 4380 pumps.
The Design Envelope 4300 pump is flushed from the pump
discharge because the mechanical seal chamber is isolated from
the liquid in the pump by a throttle bushing. Because the seal
chamber is isolated, seal environmental controls such as filters
and separators, when installed in the Design Envelope 4300
flush line are very eective, as only the seal chamber needs
cleansing, and will prolong seal life in hvac systems.
Do not run the pump unless properly filled with water as the
mechanical seals need a film of liquid between the faces for
proper operation.
Mechanical seals may ‘weep’ slightly at start-up. Allow the
pump to continue operating for several hours and the mechani-
cal seal to ‘seat’ properly prior to calling for service personnel.
The following Armstrong files are available for mechanical seal
replacement instructions:
• Series4300: tc Motor Frame – File 43.88
• Series4380: File 43.81
2.8 system cleanliness
Before starting the pump the system must be thoroughly
cleaned, flushed and drained and replenished with clean liquid.
Welding slag and other foreign materials, ‘Stop Leak’ and clean-
ing compounds and improper or excessive water treatment are
all detrimental to the pump internals and sealing arrangement.
Proper operation cannot be guaranteed if the above conditions
are not adhered to.
note:
Particular care must be taken to check the following before the
pump is put into operation:
a Pump primed?
b RotationOK?
c LubricationOK?
d Pipe work properly supported?
e VoltagesupplyOK?
f OverloadprotectionOK?
g Is the system clean?
h Is the area around the pump clean?
warranty
Does not cover any damages to the equipment resulting from
failure to observe the above precautions. Refer to Armstrong
General Terms and Warranty sheet. Contact your local
Armstrong representative for full information.