gledhill GC2000/120/E-OV Design, Installation & Servicing Instructions page 14

3.2 Heating System Design
3.2.1 General
The installation must comply with the requirement of BS 6798 and BS 5449.
Maximum water temperature is 82 ± 2°C. The appliance is supplied with the flow
and return connections terminating in 22mm copper pipe or 22mm compression
fittings.
The pump head available for the central heating circuit is shown in Figure 11.
The sealed system models incorporate the following components:-
• Heating pump - on the flow from the store.
• Expansion vessel - 12 litres, pre-charged to 1.0 bar.
• Pressure gauge 0 to 4 bar
• Expansion relief valve - set to operate at 3 bar.
At least one flushing valve should be fitted at the lowest point in the system to
enable the water system to be drained.
If the appliance is the highest point on the heating system a manual air vent is
provided above the heating pump. However, if any point of the heating system is
higher than the appliance we would recommend that an automatic air vent is fitted
at the highest point in the system.
Normal procedures for sizing heating circuit pipes should be used and the pump
head available for the heating system is shown in Figure 11.
are provided with thermostatic valves a suitable by-pass should be provided as
normal on the heating circuit.
3.2.2 Sealed Central Heating System
The sealed heating system/appliance must only be filled by a competent person.
Full details are provided in Appendix A - Design/Installation details for the CA type
backflow prevention valve assembly and anti-vacuum valve.
Note: Minimum of 2 bar mains pressure must always be available for correct
operation of CA devices.
Supplied By www.heating spares.co Tel. 0161 620 6677
SYSTEM DESIGN
If all the radiators
Page 14