Lochinvar EcoForce EF100, Installation, Commissioning, User And Maintenance Instructions

Page: 43 / 120

43
O
PEN
V
ENTED
S
YSTEM
A
RRANGEMENT
The Lochinvar E
CO
F
ORCE
™ can be used in an open vented arrangement provided that a vent pipe in accordance with CP 342, BS6644 or
BS6700 as appropriate is fitted. The minimum static head requirement for an open vented system is 0.5 bar.
U
NVENTED
S
YSTEM
A
RRANGEMENT
It is strongly recommended that unvented hot water systems be installed by an approved installer.
If the Lochinvar E
CO
F
ORCE
™ is to be used in an unvented arrangement, the system should follow the guidance given in BS6700 and must
comply with The Building Regulations 1992: Part G3, in England and Wales,P5 in Northern Ireland and P3 in Scotland. A kit of
components that have been suitably sized for the unvented operation of the appliance is available from Lochinvar Limited. For further
information, contact Lochinvar Technical Support.
10.3.1
Expansion vessel sizing
The following information is based on an inlet pressure of 3.5 bar. If a different inlet pressure is to be used, please consult BS6700.
V V = S V * e
0.45
Where:
V V
= Vessel Volume
S V = System Volume
e = Coefficient of Expansion (See Table 10.2)
Stored Temp.
 C
30 35 40 45 50 55 60
e 0.005 0.006 0.008 0.010 0.012 0.015 0.017
Stored Temp.

C
65 70 75 80 82 85 90
e 0.020 0.023 0.026 0.030 0.031 0.033 0.037
10.3.2 Coefficient of expansion of water at 3.5 bar inlet pressure
D
E
-S
TRATIFICATION
If the hot water system does not include a constantly circulated building return, it is recommended that a de-stratification pump be fitted,
between the flow connection and the circulation connection on the right hand side of the storage vessel, to ensure an even temperature
distribution throughout the stored water. De-stratification pump kits are available from Lochinvar Limited as an ancillary option.