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OPERATION
Calculated D/T is
Compared to Actual D/T
Temperature
Calculated
D/T
Temperature
1. The W8710A Equipment Monitoring System evaluates
system performance by comparing actual return and
supply air sensor readings to its own calculations. An
important calculation is the temperature difference
between the two sensors that is called Delta T or D/T.
Actual D/T Exceeds
Calculated D/T Range
Temperature
Permitted Range
Calculated
D/T
Alert Report Sent
2. When the Equipment Monitoring system determines
that the operating temperature difference, D/T, is too far
off from its own calculation, an alert is generated and
the report will be sent.The Equipment Monitoring Sys-
tem is used to monitor heating and cooling systems.
Supply Air
Actual
D/T
Return Air
Supply Air
Exceeds
Actual
D/T
Return Air
Temperature
W8710A EQUIPMENT MONITORING SYSTEM
Gas Heat
Supply Air
Temperature
HVAC Monitor
Calculated 55
Temperature Rise
Return Air
Temperature
3. The Equipment Monitoring System uses the national
industry average to determine that a 55° F calculated
D/T is the best temperature rise for most gas heat sys-
tems. The calculated D/T is factory set at 55° F and, if
necessary, can be adjusted for your individual system
and area. See Customizing Standard Calibration Set-
tings section.
Gas Heat
Supply Air
Temperature
Return Air
Temperature
4. The factory-set tolerance range in a gas heating appli-
cation is +/-20°F calculated D/T. (This example has a
tolerance range of 35°F to 75°F.) If desired, the toler-
ance range can be increased or decreased for individ-
ual system requirements. See Entering Custom Setup
section.
13
+ 20 Tolerance Range
-20 Tolerance Range
Calculated 55
Temperature Rise
68-0256
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