T775A/B/M SERIES 2000 ELECTRONIC STAND-ALONE CONTROLLERS
62-0254—13 20
Fig. 44. Setup - Sensors - Sensor B - Limit.
2.2.4. LIMIT (Sensor B only)
For the T775M2030 and T775M2048 models only, the
LIMIT item displays on the Sensor B menu.
NOTE: The LIMIT option acts only on Modulating
Output 1.
1. From the Sensors menu, use the button to
highlight SENSOR B.
2. Press the
button to display the Sensor B menu.
3. Use the
and buttons to select the LIMIT
item.
4. Use the
button to display the Limit selections.
5. Use the
and buttons to select the desired
limit, (Disable, Hi Limit, or Low Limit).
Default: Disable
6. Press the
button to accept the value and return
to the Sensor B menu.
When you select Hi Limit or Low Limit, the Sensor B menu
changes and adds the Hi/Low Limit and Throttling Range
items.
If you are setting a Hi or Low Limit, continue with “2.2.4.1.
HI LIMIT or LOW LIMIT (Sensor B only)”.
If you selected Disable for the Limit value, continue with
“2.3. Setting up the Outputs” on page 21.
Fig. 45. Setup - Sensors - Sensor B - Hi/Low Limit
(showing Hi Limit).
2.2.4.1. HI LIMIT or LOW LIMIT (Sensor B
only)
Fig. 45 shows the High Limit, but the process is the same
for setting the Low Limit.
Sensor B can be assigned a high/low limit, so that as you
are controlling temperature at Sensor A, the control
adjusts its modulating output to prevent exceeding the
user-entered limit for Sensor B.
1. From the Sensor B menu, use the
button to
highlight HI LIMIT or LOW LIMIT.
2. Press the
button display the LIMIT value.
3. Use the
and buttons to increase/decrease
the desired Limit value.
4. Press the
button to accept the value and return
to the Limit menu.
The high and low limit action will work in either the heat or
the cool mode as follows:
• When the low limit is used in the heat mode, the MOD1
output increases to prevent reaching the low limit at
sensor B.
• When the high limit is used in the heat mode, the
MOD1 output decreases to prevent reaching the hi
limit at sensor B.
• When the low limit is used in the cool mode, the MOD1
output decreases to prevent reaching the low limit at
sensor B.
• When the high limit is used in the cool mode, the
MOD1 output increases to prevent reaching hi limit at
sensor B.
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