gledhill BoilerMate CP 120 Design, Installation & Servicing Instructions page 12

DESIGN
Zone valve
District
supply
Heat meter
District
return
Pump position to overcome pressure loss on central heating circuit – no additional requirement for system expansion or excess pressure
Zone valve
District
supply
Heat meter
District
return
Pump position to overcome pressure loss on central heating circuit and coil no additional requirement for system expansion or excess pressure
Zone valve
District
supply
Heat meter
District
return
Pump and plate heat exchanger position to overcome pressure loss and additional expansion requirement on central heating circuit
– no additional requirement for excess district pressure.
Zone valve
District
supply
Heat meter
District
return
Plate heat exchanger
Pump and plate heat exchanger position to overcome pressure loss, additional expansion requirement and excess district pressure requirements
SYSTEM DETAILS
Coil flow and return
Coil flow and return
(not mid position)
Coil flow and return
Diverter Valve
(not mid position)
Local expansion system
connection required
Plate heat exchanger
Coil flow and return
Open vented feed and expansion
Or Temp. filling loop required
Local expansion system
connection required
Diverter Valve
(not mid position)
CH Bypass
CH flow to dwelling
CH return from dwelling
Diverter Valve
CH Bypass
CH flow to dwelling
CH return from dwelling
Open vented feed and expansion
Or Temp. filling loop required
CH flow to dwelling
CH Bypass
CH return from dwelling
Diverter Valve
(not mid position)
CH flow to dwelling
CH Bypass
CH return from dwelling
Page 12
In this diagram an additional pump is shown
fi tted because the pressure loss in the central
heating system is too large for the district pump.
The pump is now fi tted in the district supply
because the pressure loss over the BoilerMate
CP coil is too large.
Here, the plate heat exchanger has been fi tted
because the expansion requirements of the
central heating system are to be handled in the
dwelling rather than the whole system, or the
components in the central heating system are
not capable of withstanding the pressure of the
district heating system.
In this instance, the plate heat exchanger
provides a full pressure break between the
district heating system and the dwelling system.
The dwelling system will need to cater for
expansion and circulation requirements. This
may be used where excessive district heating
pressure occurs.