34
50
OP1
-50
OP2
•1
•2
…2 OPERATOR LEVEL
2.11 Heat/Cool Output Types
2.11.1 Reverse (Heat)/Direct (Cool) or Direct (Heat)/Reverse (Cool)
The active output, either OP1 (Heat) or OP2 (Cool) is displayed and may be adjusted in manual
mode. The OP1 and OP2 l.e.d.s indicate which output is changing.
Output Positive (Heat Output Active)
Heat Output
[0 to 100% (0 to 110% in manual mode with analog
outputs)]. Adjustable in manual mode only.
Output Negative (Cool Output Active)
Cool Output
[–100 to 0% (–110 to 0% in manual mode with
analog outputs)]. Adjustable in manual mode only.
OP2 (cool)
OP1 (heat)
Y2.St Y1.St
PID O/P
0%
–100%
100%
+100%
Fig. 2.10 Typical Response – Reverse/Direct or Direct/Reverse Control Action
2.11.2 Reverse (Heat)/Reverse (Cool) or Direct (Heat)/Direct (Cool)
It is not possible to view or adjust the heat/cool outputs directly. The PID output (0 to 100%), used to
calculate the heat (OP1) and cool (OP2) outputs, is displayed and may be adjusted in manual mode.
The OP1 and OP2 l.e.d.s indicate which output is changing.
OP2
(cool)
OP1
(heat)
Y2.St
Y1.St
PID O/P
OP2 l.e.d. lit OP1 l.e.d. lit
100%
0%
0%
100%
Fig. 2.11 Typical Response – Reverse/Reverse or Direct/Direct Control Action
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