A
W-TRAC
IOM‐49
6 of 12
Mar 99 R4
CONTROLLER
DESCRIPTION
TERMINAL
LIST
Terminal
Description
C1
Sensor common, and 0‐10Vdc reset common (‐).
S
0‐10Vdc temperature reset input (+).
D
Supply air temperature sensor input.
E
Exhaust air temperature sensor input.
A
Outside air temperature sensor input.
RMH
0‐10Vdc return air RH% input.
EXH
0‐10Vdc exhaust air RH% input.
MOD
0‐10Vdc heat wheel control output (+).
C2
0‐10Vdc heat wheel control output (‐).
+12
12Vdc output power
+32
32Vdc output power (RH% sensor hot)
T2(N)
24Vac Neutral power input.
T1
24Vac Hot power input.
6
Output contact common
5
Output contact normally closed (N.C.)
4
Output contact normally open (N.O.). Start contact.
P1
Low output potentiometer (legacy, for old style DC drive motors).
P2
Wiper output potentiometer (legacy, for old style DC drive motors).
P3
High output potentiometer (legacy, for old style DC drive motors).
DIP
SWITCHES
W‐TRAC configuration options are configured by DIP switch selection and/or wiring connections. These
are factory set and should not normally need to be altered.
DIP SW
Description
BDRH SP EN
‘ON’ when RH% sensing of the return air is not used. W‐TRAC will control based on
pre‐defined RH% values. Switch will be ‘OFF’ when sensing actual RH%.
EXRH CTRL
‘ON’ when using exhaust air RH% sensing.
BDRH CTRL
‘ON’ when RH% sensing of the return air is not used. Switch must be in the same
position as BDRH SP EN (above).
MAN HI SPEED*
‘ON’ to drive the output to maximum wheel rotation speed.
MAN LO SPEED*
‘ON’ to drive the output to minimum wheel rotation speed.
* Do not enable both switches at the same time, or leave either switch ‘on’ in normal operation.
