23
De-Icer Installation (if applicable)
Figure 13. Shively de-icer control
box layout
Thermostat installation (if
applicable)
You may locate the thermostat, if applicable, at your discretion. We recom-
mend mounting it as close as practical to the antenna.
a. Mount the thermostat and connect the thermostat leads to points S1 and S2
in the control box as shown in the schematic diagram,
Figure 11
on page 21.
b. Before you connect the thermostat, take initial readings:
CAUTION
When taking thermostat resistance readings, be sure to have one or
both thermostat leads disconnected. Otherwise, readings may be
affected by other components.
(1) Measure the resistance across the thermostat circuit and from it to
ground to ensure that there are no short-circuits. Test at the location
shown in
Figure 11
.
(2) Measure the resistance across each heater leg. Be sure to add in the
resistance of any long cable runs from the control box to the antenna.
(3) Thermostat readings should be as shown in
Table 3
on page 24 (single
thermostat) or
Table 4
on page 25 (tandem thermostat).
(4) Record the resistance and current readings in your maintenance log for
future reference in troubleshooting the de-icer system.
c. Complete thermostat electrical connections.
