TC 1, TC 2, TC 3 · Edition 07.22
EN-6
Mains voltage: 120 V AC/230 V AC, control voltage:
24 V DC
Finishing the wiring
5 tIGHtness test
➔
All new connections between the valve and the TC
must be checked for tightness.
1
Pressurize the system. Do not exceed the maximum
inlet pressure.
2
Use a soap solution to check the pipe connections
for leaks.
6 settInG tHe test InstAnt
➔
The test instant (MODE) can be set using two DIP
switches.
1
Disconnect the unit from the electrical power sup-
ply.
➔
Before opening the unit, the fitter should ground
himself.
2
Unscrew the housing cover.
3
Set the test instant to Mode 1, 2 or 3.
➔
Mode 1: test before burner start-up with incoming
thermostat/start-up signal (factory setting).
➔
Mode 2: test after burner run when the thermostat/
start-up signal drops and after switching on the
mains voltage.
➔
The tightness test also starts after a reset.
➔
Mode 3: test with incoming thermostat/start-up
signal before burner start-up and when the
thermostat/start-up signal drops after burner run.
➔
Invalid switch setting: no function. The operating
signal LED is permanently red, see page 8
(9 Assistance in the event of malfunction).
➔
Continue with page 6 (7 Setting the measure-
7 settInG tHe MeAsUReMent tIMe
➔
The measurement time t
M
can be set with a jumper
in increments of 5 s to max. 30 s.
➔
t
M
is set to 30 s at the factory.
t
M
5s
10s
15s
20s
25s
30s
➔
No jumper: no function. The operating signal LED
is permanently red, see page 8 (9 Assistance
➔
The longer the measurement time t
M
, the greater
the sensitivity of the tightness control. The longer
the measurement time, the lower the leakage rate at
which a safety shut-down/fault lock-out is triggered.
➔
The tightness control TC requires a mini-
mum start rate in order to carry out tight-
ness tests on slow opening valves:
up to 5 l (1.3 gal) test volume
V
P
= 5% of maximum flow rate Q
max.
,
up to 12 l (3.12 gal) test volume V
P
= 10% of max-
imum flow rate Q
max.
.
7.1 Determining the measurement time
If a leakage rate is specified, find the measurement
time t
M
from the following:
Q
max.
= max. flow rate [m
3
/h]
Q
L
= Q
max.
[m
3
/h] x 0.1% = leakage rate [l/h]
p
u
= inlet pressure [mbar]
V
P
= test volume [l]
t
M
[s] =
2,5 x p
u
[mbar] x V
P
[l]
Q
L
[l/h]
For all CG versions, measurement time t
M
must be
set to 5 s on TC 1C.
7.2 Determining the test volume
Test volume V
P
is calculated from the valve volume V
V
,
added to the volume of the pipe V
R
for each additional
metre in length L.
L
V
P
= V
V
+ L x V
R
V
P
V1
V2
