installation &
operating instructions
Design Envelope 4200h & 4280
End Suction Horizontal Pumping Units
38
6.0 maintenance
6.1 general care
Vertical in-Line pumps are built to operate without periodic
maintenance, other than motor lubrication on larger units. A
systematic inspection made at regular intervals, will ensure
years of trouble-free operation, giving special attention to the
following:
• Keep unit clean
• Provide the motor with correctly sized overload protection.
Keep moisture, refuse, dust or other loose particles away
from the pump and ventilating openings of the motor.
• Avoid operating the unit in overheated surroundings (Above
100°f/40°c).
warning
Whenever any service work is to be performed on
a pumping unit, disconnect the power source to
the driver, lock it o and tag with the reason. Any
possibility of the unit starting while being serviced must be
eliminated. If mechanical seal environmental accessories are
installed, ensure water is flowing through the sight flow
indicator and that filter cartridges are replaced as recommend-
ed. (See Armstrong files 43.85 and 43.86 for seal environ-
mental instructions).
6.2 lubrication
Pump
Lubrication is not required. There are no bearings in the pump
that need external lubrication service.
Large Design Envelope 4200h 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 motor
manufacturer. Many small and medium sized motors are per-
manently lubricated and need no added lubrication. Generally,
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.
6.3 mechanical seal
Mechanical seals require no special attention. The mechanical
seal is fitted with a flush line. The seal is flushed from discharge
of the pump casing on Design Envelope 4200h pumps and
from the suction on Design Envelope 4280 pumps.
The Design Envelope 4200h 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
4200h flush line are very eective, 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.
warning
Hydronic system components may be pressurized
which, if suddenly released, can cause serious injury or
death. When performing any kind of service to the
pump, the pressure must be released in the system
and the unit should be properly drained before starting
any service work.
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