BOC Edwards 18B4B, Instruction Manual, Page: 51 / 62

Feb 04 Issue A
18B4B Vapour Booster Pumps
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5.9 Check the heater clamp plate and
retaining nuts
You must regularly check the heater clamp plate and
retaining nuts, to ensure that the heaters make good
contact with the pump base. If a heater does not
make good contact, thermal transfer will be
inefficient, and the heater may overheat.
Refer to Figure 13 and use the following procedure
to check the heater clamp plate and retaining nuts:
1. Check that the heater clamp and spacer
assembly (10) is tight. Tighten if necessary.
2. Check that each of the three heater retaining
nuts (13) is tight. If necessary, tighten the nut to
a torque of 44 N m.
5.10 Clean the cooling-coil
You must clean the cooling-coil at least once a year,
and more regularly if the water supply has a high
calcium content.
To clean the cooling-coil:
1. Flush the cooling-coil with a suitable descaling
agent. For example, a 15% hydrochloric acid
solution can be used for decalcification,
followed by a 5% sodium carbonate solution for
neutralization.
2. Flush the cooling-coil through with clean water,
to ensure that no descaling agent (or
neutralizer) remains in the cooling-coil.
5.11 Fault finding
A list of fault conditions and their possible causes is
provided in Table 12 (page 46) to assist you in basic
fault-finding.
If problems persist, contact your supplier or your
nearest BOC Edwards Service Centre.