Product Overview
TH 192 DN Day-Night and DNV Day-Night-Vent Room Thermostat Technical Instruction
155-067P25
Rev. 1, July, 1999
Siemens Building Technologies, Inc. Page 7
Landis Division
Manual Selector Switch A manual selector switch allows an individual thermostat to control at its day setting
even though the remainder of the system is controlling at its night setting.
•
In the normal AUTO position, the manual selector switch does not interfere with air
passage to the changeover relay.
•
To manually set the selector switch to the DAY position, push selector in until it
latches and the handle points downward. In the latched DAY position, the manual
selector switch seals off air to the changeover relay.
•
To manually reset the selector switch, rotate the handle until it unlatches and
returns to the normal AUTO position.
•
Manual Selector Switch resets automatically when supply pressure changes back to
day time control.
Day-Night-Vent Operation The TH 192 DNV provides a supplementary air line connection at the back of the
thermostat.
N
NN
NO
OO
OT
TT
TE
EE
E:
::
:
This third line feature cannot be added to a TH 192 DN in the field.
The vent line provides either 0 or 25 psi (0 or 172 kPa) pressure via the manual selector
switch to pilot auxiliary controls. For example, a unit ventilator can provide continuous
full day operation when the space is occupied and intermittent night operation when the
space is unoccupied.
T
TT
TH
H H
H 192
192 192
192 D
DD
DN
N N
N &
& &
& D
DD
DN
NN
NV
VV
V
T
TT
Th
hh
he
ee
er
rr
rm
mm
mo
oo
os
ss
st
tt
ta
aa
at
t t
t D
DD
De
ee
et
tt
ta
aa
ai
ii
il
ll
ls
ss
s
F
FF
Fi
ii
ig
gg
gu
uu
ur
rr
re
e e
e 6
66
6.
. .
.
T
TT
TH
H H
H 1
11
192
92 92
92 D
DD
DN
N N
N &
& &
& D
DD
DN
NN
NV
V V
V T
TT
Th
hh
he
ee
er
rr
rm
mm
mo
oo
os
ss
st
tt
ta
aa
at
t t
t D
DD
De
ee
et
tt
ta
aa
ail
ilil
ils
ss
s.
..
.
T
TT
Th
hh
he
ee
er
rr
rm
mm
mo
oo
om
mm
me
ee
et
tt
te
ee
er
rr
r
C
CC
Ca
aa
ali
lili
libr
brbr
bra
aa
at
tt
ti
ii
io
oo
on
nn
n
1.
Use a test thermometer to read the current room temperature.
2.
Place a screwdriver in the center of the thermometer assembly (Figure 6). Carefully
rotate thermometer assembly until pointer tip indicates the correct room
temperature.
N
NN
NO
OO
OT
TT
TE
EE
E:
::
:
Avoid breathing on or touching the bimetal spiral since this influences the
temperature reading.