Honeywell W7620 - Manual (Page 10)

T and Al). See the T7660 Space Temperature
Sensor specification sheet, Form 63-4219, for the
correct temperature to resistance value
cross-reference.
4 . If long sensor wiring is used, resistance
supplied to the W7620 by both the temperature
sensor and the leadwire for greater accuracy.
Output Point Test Procedures
Testing outputs consists of observing the analog or digital
output states of physical points to see that the value or
state is comparable to the point value as displayed on
the S7610 POT or ZM760l/ZM7603 software. These
devices can be used to override the output point to a
known state to facilitate checkout. Use the following
procedures:
1 . Set the override on an output point to a desired
value with the S7610 POT or ZM7601/ZM7603
software.
2. Measure or observe the output condition (e.g., fan
turns on).
3 . If the output does not follow the command
override condition, isolate the problem by
checking connections and measurements at the
output destination as well as at the W7620.
4. Clear the override condition.
Example:
The following procedure is for Fan (can be
any one of the outputs, 1-7, depending on
output options selected, see W7620 Single
Zone/WSHP Application Guide, Form
63-4220.
1. Display Fan (OUT.) on the S7610 POT or
ZM7601/03 software.
2. Set into override the point to the desired state, ON
or OFF.
3 . Observe the fan or measure the output. If the
expected result is not achieved, measure the
resistance across the correct terminals (e.g.,
OUT1 A and C). The resistance should hold at
approximately
1.0 when the output is ON.