McQuay IM 987 95
Unit Options
Ultraviolet Light Operation
Refer to the wiring schematic below. 115 V (ac) power for the
UV lights is provided by control circuit transformer T1. The
lights operate whenever the unit is powered, system switch S1
is closed, and all doors with door power disconnect switches
are closed. To turn the lights off, disconnect power to the entire
unit, or open system switch S1.
The normally open disconnect switches are wired in series in a
circuit that supplies 24 V (ac) to the coil of relay R45. When
all doors are closed, relay R45 is energized, and its normally
open contacts (in series with system switch S1) provide 115 V
(ac) to the UV lights.
Figure 110: Typical Ultraviolet Light Wiring Schematic
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