7
6.0
WATER CONNECTIONS
6.1
GENERAL
1.
Circulating pipework should be insulated; cisterns, expansion vessels and pipework situated in
areas exposed to freezing conditions should also be insulated.
2.
Drain valves must be located in accessible positions that will permit draining of the entire
system.
3.
Ideally, individual valves should be fitted to each unit to enable isolation from the system.
6.2
OPEN VENTED SYSTEM
The Lochinvar SST can be used in an open vented arrangement provided that a vent pipe in accordance
with CP342 or BS6700 is fitted. The minimum static head requirement for an open vented system will
be detailed in the ICM Instructions of the primary heat source. If you require a pipework schematic for
multiple appliances please contact Lochinvar Limited.
6.2.1
RECOMMENDED PIPEWORK FOR A CONDENSING CIRCULATING APPLIANCE
6.2.2
RECOMMENDED PIPEWORK FOR A STORAGE APPLIANCE
BUILDING
RETURN
BUILDING
FLOW
IV
STORAGE VESSEL
TD
TPRV
BRP
NRV
IV
IV
CONDENSING
CIRCULATING
WATER HEATER
PCP
IV
TD
EV
IV
IV
IV
IV
IV
= ISOLATION VALVE
NRV = NON-RETURN VALVE
TD
= TUNDISH
LSV
= LOCKSHIELD VALVE
TPRV = TEMPERATURE & PRESSURE RELIEF VALVE
DV
= DRAIN VALVE
BRP = BUILDING RETURN PUMP
PCP = PRIMARY CIRCULATING PUMP
*
= OPTIONAL
COLD WATER
STORAGE CISTERN
COLD WATER
DISTRIBUTION
PIPE
WARNING
PIPE
NRV
VENT PIPE
*
IV
CP
NRV
IV
BUILDING
RETURN
IV
= ISOLATION VALVE
NRV = NON-RETURN VALVE
TD
= TUNDISH (OPTIONAL)
TPRV = TEMPERATURE & PRESSURE RELIEF VALVE
CP
= CIRCULATING PUMP
BRP = BUILDING RETURN PUMP
TPV = THREE PORT VALVE
*
= OPTIONAL
BUILDING
FLOW
COLD WATER SUPPLY TO BUILDING
COLD WATER STORAGE TANK
VENT PIPE
STORAGE VESSEL
STORAGE WATER
HEATER
IV BRP
NRV
IV
IV
NRV
IV
IV
TD
EV
IV
