WattMaster WCC II - Manual (Page 168)

Section 3: Screen Descriptions
WCC II Operator’s Guide
Operator Interfaces 3-136
For example, assume that the space temperature setpoint is 72 ºF,
and the actual temperature is 70 ºF. The “Offset” is -2 ºF.
Actual Temperature
Temperature Setpoint Offset
74 ºF 72 ºF +2 ºF
72 ºF 72 ºF 0 ºF
70 ºF 72 ºF -2 ºF
To enter an offset value, simply use the arrow keys to position the
cursor over the offset number, type in the desired value, and press
. Then move the cursor over the [(+),(-), or (+/-)] sign and
press the once, and the next choice will appear. After
the desired symbol appears, press .
Deadband
Enabled by Spread
Relay 1 [GB1-GB15] [0-16] Deg F
Relay 2 [GB1-GB15] [0-16] Deg F
Relay 3 [GB1-GB15] [0-16] Deg F
Deadband spreading is used to adjust the temperature setpoints if
a global binary value goes on. The TUC’s can monitor the status
of global binary values GB1-15. If the global binary value which
enables the deadband spread goes ON, the spread value is added
to the offset. For example, assume that the offset value for relay 1
is +/- 1 °F, the deadband spread value is 1 °F, and the deadband is
enabled by GB1. When GB1 is OFF, relay 1 will be energized when
the actual space temperature is more than 1 °F (plus hysteresis)
above or below the setpoint. When GB1 is ON, relay 1 will be
energized when the actual space temperature is more than 2 °F
(plus hysteresis) above or below the setpoint.
Minimum
ON Time OFF Time
Relay 1 [0-127] [min] [sec] [0-127] [min] [sec]
Relay 2 [0-127] [min] [sec] [0-127] [min] [sec]
Relay 3 [0-127] [min] [sec] [0-127] [min] [sec]
This input specifi es the minimum ON and OFF times for the relays.
That is to say, once a relay is energized, it will remain energized
for its minimum ON time value. Once it is de-energized, it will
remain OFF for its minimum OFF time value. The range is from 0-
127 minutes or seconds. Since you have a choice between minutes
and seconds, place the cursor over the present choice and press
the
once for each choice. When the desired choice
appears, press .
Forced
Relay 1 [ON] [OFF] [NO]
Relay 2 [ON] [OFF] [NO]
Relay 3 [ON] [OFF] [NO]
This position allows you to manually force a relay ON or OFF.
For example, if you want to force Relay 1 OFF, place the cursor
over the ON/OFF choice fi eld and press the
until
the “OFF” message appears, and then press . Relay 1 will
then be forced “OFF” when you leave the TUC Setup Screen. To
release the force, you must re-enter this screen and select “No.”
Note: If the relays have other control options which are also
causing them to be forced ON or OFF, this manual override
may not have top priority. For example, if you have set the
system up so the fan (relay 1) is forced ON if the compressor
(relay 2) is ON, then you cannot override the fan OFF if the
compressor is ON.
-
<-RELAY ON-> <--------------RELAY OFF------------>
<--(-)OFFSET-->
<--DECREASE IN SPACE TEMP----->+<---INCREASE IN SPACE TEMP--->
SETPOINT
(-) OFFSET
__________________________________________
<-RELAY ON-><-----------RELAY OFF--------->
<--(-)OFFSET--><--(+)OFFSET-->
<---DECREASE IN SPACE TEMP--->+<--INCREASE IN SPACE TEMP-->
SETPOINT
(+/-) OFFSET
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