Installation
3/07 UDC3500 Universal Digital Controller Product Manual 25
Table 2-6 Single or Cascade Loop Controller – Loop 1 Output Functionality
and Restrictions
Output Alg.
Selection
Output #2
Option
Function of
Output #2
1st Current
Output
2nd Current
Output *
Relay #3 Relay #4 Relay #5
Single Relay HEAT NUL1 NUL1 Alarm 3 Alarm 2 Alarm 1
Third Current Output N/A N/A N/A N/A N/A N/A
Dual Relay HEAT NUL1 NUL1 Alarm 3 Alarm 2 Alarm 1
Time Simplex
or ON-OFF
Simplex
None N/A N/A N/A N/A N/A N/A
Single Relay N/A N/A N/A N/A N/A N/A
Third Current Output N/A N/A N/A N/A N/A N/A
Dual Relay HEAT and
COOL
NUL1 NUL1 Alarm 3 Alarm 2 Alarm 1
Time Duplex or
ON-OFF
Duplex or
TPSC or
Position
Proportional **
None N/A N/A N/A N/A N/A N/A
Single Relay Alarm 4 HEAT NUL1 Alarm 3 Alarm 2 Alarm 1
Third Current Output NUL1 HEAT NUL1 Alarm 3 Alarm 2 Alarm 1
Dual Relay Alarm 4 HEAT NUL1 Alarm 3 Alarm 2 Alarm 1
Current
Simplex
None N/A HEAT NUL1 Alarm 3 Alarm 2 Alarm 1
Single Relay Alarm 4 HEAT and
COOL
NUL1 Alarm 3 Alarm 2 Alarm 1
Third Current Output NUL1 HEAT and
COOL
NUL1 Alarm 3 Alarm 2 Alarm 1
Dual Relay Alarm 4 HEAT and
COOL
NUL1 Alarm 3 Alarm 2 Alarm 1
Current Duplex
100 %
1st Current
Output =
COOL and
HEAT
None N/A HEAT and
COOL
NUL1 Alarm 3 Alarm 2 Alarm 1
Single Relay Alarm 4 HEAT COOL Alarm 3 Alarm 2 Alarm 1
Third Current Output NUL1 *** HEAT COOL *** Alarm 3 Alarm 2 Alarm 1
Dual Relay Alarm 4 HEAT COOL Alarm 3 Alarm 2 Alarm 1
Current Duplex
50 % ***
Cur #1 = HEAT
Cur #2 or #3 =
COOL
None N/A HEAT COOL Alarm 3 Alarm 2 Alarm 1
Single Relay HEAT COOL NUL1 Alarm 3 Alarm 2 Alarm 1
Third Current Output N/A N/A N/A N/A N/A N/A
Dual Relay HEAT COOL NUL1 Alarm 3 Alarm 2 Alarm 1
Current/Time
First Current
Out = COOL
Time = HEAT
None N/A N/A N/A N/A N/A N/A
Single Relay COOL HEAT NUL1 Alarm 3 Alarm 2 Alarm 1
Third Current Output N/A N/A N/A N/A N/A N/A
Dual Relay COOL HEAT NUL1 Alarm 3 Alarm 2 Alarm 1
Time/Current
Time = COOL
First Current
Out = HEAT
None N/A N/A N/A N/A N/A N/A
TPSC = Three Position Step Control
N/A = The output form or the individual output is N
ot Available, not operable or is not used for this
Output #2 Option selection.
NUL1 = N
ot Used on Loop 1 – This particular output is not used for the selected Loop 1 Output
Type, But it may be used for the Second Loop Output Type. Refer to the selection made in
Table 2-7. Any current output not used as a Control Output for either loop may be used as
an Auxiliary Output.
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