D E S C R I P T I O N
Safety Fittings
It is not necessary to fit control and safety equipment
normally associated with mains pressure hot water
storage appliances e.g. temperature and pressure relief
valves and expansion vessel. PulsaCoil is WBS listed
and a non-return valve is not required. However if the
ancillary equipment fitted in the supply to these appliances
require a non-return valve then the valve must be fitted
directly after the branch to the drinking water i.e. a kitchen
sink as shown schematically in Figure 1.1.
Domestic Hot Water Flow Rates
Provided the pipe sizing and the supply pressure is ad-
equate the hot water flow rate should be up to 35 litres/
min for all models (see Table 1.1). The domestic hot
water outlet temperature is regulated to 55
o
C by the elec-
tronic control system and is not user adjustable.
Use in Hard Water Areas
There are two options for the pump speed control. Option
‘H’ must be used in hard water areas above 200ppm.
Option ‘S’ can be used in soft water areas below 200ppm.
A patented control system within the Option ‘H’
microprocessor offers a more sophisticated level of pump
speed control and will help prevent the formation of scale.
Both options (‘H’ and ‘S’) prevent domestic hot water
from exceeding 55
0
C for most of the operational times of
the appliance.
It is not necessary to fit any form of scale inhibiting
equipment in the domestic cold water supply to the
PulsaCoil when using option ‘H’.
If scale should however become a problem the plate heat
exchanger is easily isolated and can be replaced with a
service exchange unit.
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