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TC · Edition 08.17 12

Application

1.1.6

TC 2 in a multiple burner system with several valves

installed in series

Mains voltage = control voltage

V3 and V4: quick opening, nominal size is dependent

on test volume V

and inlet pressure p

, see page 38

(Project planning information), but is at least DN 15.

When using slow opening main valves (V1 and V2), aux-

iliary valves (V3 and V4) must be used for the supply

and discharge of the test volume V

TC 2 checks the central shut-off valve V1, the gas so-

lenoid valve V2, the auxiliary valves V3 and V4 and the

pipe between these valves for tightness.

Valve V2 can only be checked for tightness when the

pressure downstream of V2 approximately corresponds

to the atmospheric pressure and the volume down-

stream of valve V2 is 5 x V

. The gas solenoid valve VAS

and the pressure switch DG

VAS

are used to relieve the

pressure. The pressure switch must be adjusted in such

a way so that enough pressure is relieved and no air can

get into the pipework.

Once the tightness test has been carried out success-

fully, TC 2 opens the main valves V1 and V2 with the

OK enable signal and enables the downstream burner

control units.

V1 V2

TC 2

VAS

TC 2

Honeywell TC Series User Manual

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