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Plumbing
Requirements
Ensure the unit is off before connecting tubing to the unit.
Hose Connections
The pump connections are located at the rear of the pump box and are labelled
PUMP INLET and PUMP OUTLET. These connections are bent upward so the
recirculating fluid will drain back into the reservoir when the hoses are discon-
nected. Both connections are capped with stainless steel serrated plugs.
The pump lines have ¼" MPT for mating with standard plumbing fittings. For
your convenience stainless steel adapters, ¼" FPT to
3
/8" O.D. serrated fitting,
are provided. (To assure proper fit, they should be installed using 1½ turns of
Teflon
®
tape around the threads.)
Flexible tubing, if used, should be of heavy wall or reinforced construction.
Make sure all tubing connections are securely clamped. Avoid running
tubing near radiators, hot water pipes, etc. If substantial lengths of tubing
are necessary, insulation may be required to prevent loss of cooling capacity.
Tubing and insulation are available from NESLAB. Contact our Sales
Department for more information (see Preface, After-sale Support).
It is important to keep the distance between the unit and the external system
as short as possible, and to use the largest diameter tubing practical. Tubing
should be straight and without bends. If diameter reductions must be made,
make them at the inlet and outlet of the external system, not at the unit.
If substantial lengths of cooling lines are required, they should be pre-filled
with bath fluid before connecting them to the unit. This will ensure that an
adequate amount of fluid will be in the bath once it is in operation.
Pumping
The pump is designed to deliver a flow of 15 liters per minute (4 gallons per
minute) at 0 feet head. To prevent external circulation, the PUMP INLET and
PUMP OUTLET lines on the rear of the unit are capped. The caps must be
removed when external circulation is required.
To properly secure external hose connections to the unit, wrap Teflon
®
tape
around the pipe line threads before installation. Once the hose connections
are made, the hoses must be properly plumbed to an external system.
It is
important the bath is not in operation until all plumbing is complete.
NOTE: To increase agitation in the bath when not circulating externally,
connect a short loop of hose between the inlet and outlet lines.
If the bath is not used for external circulation or incresed agitation, make sure
the stainless steel caps are in place prior to operating the bath.
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