Keston Thermomatic RSM20/FB, Installation & Servicing Instructions Manual, Page: 8 / 46

Page 8
Speed RPM Watts
Input
Full Load
Current in Amps
Position 1 1000 30-35 016
Position It 170O 45-60 025
Position III 2450 72.92 038
Fig. 3-2 PUMP PERFORMANCE
M. Central heating pressure
We recommended that the initial design pressure, i.e. when cold, be 1 bar When fully heated and drawing
a full load, the resultant hot pressure must not exceed 2.7 bar. The safety valve will discharge at 3 bar ± 0.3
bar.
N. System design
A typical sealed system is shown in Fig.3.3.
3.3.2 Domestic hot water circuit
See Fig.3.1 for connections
An extended copper coil is filled which is healed from the primary water. Starting from cold, the appliance
should be fully heated before full capacity hot water supply is obtained
IMPORTANT
To conform to the requirements of the National Water Council, il the main water pressure is at any lime in
excess of 73 psi. (5 bars) {1 69(1) a Pressure Limiting or Pressure Reducing Valve must be fined by the
installer into the mains supply in an inconspicuous approved by Ihe NWC and must not allow more than 73
psi. (5 bars) pressure to the appliance.