Honeywell BA 299 I Einbauanleitung Seite 9

3. Installation
Type BA backflow preventers must be installed horizontally.
Fig. 1
Shutoff valves should be fitted on both sides. In addition, a
strainer (see Section 11. Accessories) is recommended to be
fitted before the backflow preventer to protect against
damage by coarse dirt. The backflow preventer is installed
without bending or other stresses as follows:
1. Thoroughly flush system pipework (Fig. 1).
2. Ensure that connections on backflow preventer are
clean (Fig. 2).
3. Install backflow preventer as shown in Fig. 3, observing
points in section 3.1:
Check that flow is in direction of arrow
Maintain required clearances
Fig. 2
Ensure good accessibility
Tighten union backnuts to torque values in table 1
Connect discharge pipework close coupled and without
tight bends according to connection dimensions in table 2.
Install discharge pipework in such a way that the
discharge connection and the discharge valve can be
removed for inspection.
Table1
Connection size
Tightening torque
[Nm]
Fig. 3
A
C
B
16
GB
1 / " 3 / " 1'' 1 1 / '' 1 1 /
2 4 4 2
40 50 65 70 85
F
E
G
D
Table 2
Connection size 1 / " 3 / " 1'' 1 1 / '' 1
2 4 4
A 100 100 100 100
B 500 500 500 500
C 45 45 55 55
D 40 40 50 50
E 112 112 122 122
F 200 200 220 220
G 20 20 20 20
Dimensions (mm)
3.1 Guidelines for a safe installation
" 2"
100
1 / " 2"
2
100 100
500 500
60 70
60 70
127 127
280 280
20 20
GB
The location where the backflow preventer is installed must
be accessible at all times and be free from frost. Good
ventilation is also necessary.
If the discharge pipework is also used for other appliances
or systems, then the pipework must be suitably sized to
allow for this.
No other unprotected potable water system may be
connected downstream of the backflow preventer.
Individual connections in the downsteam system are not
protected against back flow from other parts of the
downstream system. If required, further protection
measures can be installed to protect individual parts of the
system.
The backflow preventer must at all times be fully accessible.
Pressure gauges and control elements must not be added.
Where backflow preventers are installed care must be taken
that when the valve is in the shutoff position discharges are
safely carried away by the discharge pipework. Installation
in ducts or areas where there is risk of flooding is not
permissible. To facilitate inspection and maintenance, shutoff
valves should be fitted on both sides of the backflow
preventer. The backflow preventer must be installed so that
the discharge valve is above the surrounding maximum
water table.
The control of the discharge valve is fitted with suitable
safety equipment to ensure that in the event of failure the
discharge valve aperture remains fully open. If this occurs,
the following discharge rates can be expected when the
pressure in the middle chamber is 1.0 bar and discharge
pipework should be sized accordingly.
1 / " 3 / " 1'' 1 1 / ''
2 4 4
m 3 /h 2.5 2.5 9.0 9.0
1 1 / " 2"
2
16.0 16.0
17