HAMWORTHY HEATING LTD
9
WEYMOUTH
500001112/C
7.5 Initial Setting Of Both Standard And Advanced Units
1) Check water inlet supply, it MUST have a flow greater than 8l/min.
2) Flow Restrictors
Standard
Each Standard comes with a selection of inserts that can be fitted into the inlet valve to achieve the required
output:
Mains inlet pressure > 4 bar H.P. restrictor (narrow coils see fig 11)
Figure 11 Restrictor Inserts Standard
Mains inlet pressure < 4 bar L.P. restrictor (wide coils see fig 11)
The restrictors are fitted by pushing them into the open end of the
Inlet before attaching the unit to the water supply (see fig 11)
Advanced
Each Advanced comes with a selection of inserts that can be fitted into the inlet valve to achieve the required
output:
Mains inlet pressure > 4 bar H.P. restrictor (white see fig 12)
Figure 12 Restrictor Inserts Advanced
Mains inlet pressure < 4 bar L.P. restrictor (red see fig 12)
The HP restrictor is fitted in the inlet side of the float valve assembly. This
should be unscrewed in order to change the restrictor (see fig 13). The LP
Restrictor is clipped to the side of the valve assembly.
Figure 13 Changing Advanced Restrictor Inserts
3) If the cold water is from a tank then the tank must be at least 2m above the inlet for the header tank to remain
full when the pump is working at maximum rate. The pressurisation units should not be used to fill a heating
system.
4) Check that the unit has been connected to the system using a suitable isolation valve.
5) Check that the mains lead has been connected to a suitably fused and switched isolator.
6) The cold fill pressure switches on both the Advanced and Standard are factory set to the levels listed in figure
2 as are the Hi and Lo pressure switches. If these levels are unsuitable for the installation then adjustment
instructions are given in section 7.3.
7) Set the float to its lowest level. (fig 14)
Figure 14a. Float Adjustment Standard Figure 14b. Float Adjustment Advanced
