10
Redundant operation is supported, allowing a control module to automatically power itself from
either of two switch interface modules or both. This permits one heat-trace circuit to be turned
off for maintenance without affecting the operation of the other circuit.
1.3.5 COMMUNICATIONS INTERFACE
In applications where the user wishes remote configuration capability or wants to communicate
trace information and/or alarms to another device such as the
GCC (Group Communications
Controller), an optional communications interface may be installed in the control module.
A modem version that maintains compatibility with legacy products is available, or other industry-
standard interfaces such as RS-232 and RS-485 may be specified.
1.3.6 SOLID-STATE RELAY OUTPUT MODULE
In applications where the benefits of solid-state control are desired, a modular solid-state relay
(SSR) is available. This component is easily installed on the outside of an enclosure using a sin-
gle 3/4
NPT knockout and locknut providing a weatherproof seal. This allows the heat generated
by the
SSR to be dissipated directly to the ambient air, without increasing the internal tempera-
ture of the enclosure. When applications require two-pole or 3-phase switching, multiple
SSR
modules may be ganged together, allowing the same component to be used.
1.4 Controller Assemblies
Due to its modular packaging, the 920 easily supports single-, dual-, or multi-point configura-
tions. Factory standard assemblies are available in a variety of enclosure types, and panels made
up of multiple points are also available. Refer to the Ordering Guide in section 1.5 on page 10 for
a sample listing of available configurations. If your application requires a customized solution,
please contact your Tyco Thermal Controls representative for help in specifying an assembly
suited to your particular requirements.
1.5 Ordering and Configuration Guide
920 series control assemblies are ordered as three separate items:
Fig. 1.6 920 series control assemblies
Tyco Thermal Controls maintains a shelf stock of enclosure assemblies, control modules, and
consoles. All other enclosure assemblies are built to order. Not all options may be listed. Contact
your local representative for any special applications you may have.
Tx
Rx
A
B
A
/
B
A
L
A
R
M
L
O
C
K
M
O
N
I
T
O
R
C
O
N
F
I
G
S
T
A
T
U
S
A
L
A
R
M
O
U
T
P
U
T
S
H
I
F
T
B
A
C
K
E
N
T
E
R
DigiTrace
™
920 SERIES
PROGRA
M
M
AB
LE DU
AL P
O
INT
H
EA
T TRACING CON
TRO
LLER
Enclosure assembly Control module(s)
(One for every two circuits)
Optional operator
console(s)
P
R
O
G
R
A
M
M
A
B
L
E
D
UA
L
P
O
IN
T
H
E
A
T
T
R
A
C
I
N
G
C
O
N
T
R
O
L
L
E
R
A
/B
A
L
A
R
M
L
O
C
K
M
O
N
IT
O
R
C
O
N
F
IG
S
T
ATU
S
A
L
A
R
M
O
U
T
P
U
T
S
H
IF
T
B
A
C
K
E
N
T
E
R
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