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Smart Equipment™ unit control board
Figure 29: Unit control board
The following tables describe the details of the UCB, see the previous figure for the connection locations.
Table 42: Smart Equipment™ UCB - thermostat connection strip
Location
Label
Description
Function and comments
W1
1st stage heating request, 24 VAC input switched from R
Not effective for cooling-only units
W2
2nd stage heating request, 24 VAC input switched from R
Not effective for cooling-only units or units with single-stage heat sections
Y1
1st stage cooling request, 24 VAC input switched from R
Y2
2nd stage cooling request, 24 VAC input switched from R
Visible in the display menu when the #ClgStgs parameter is set for 2 or more,
also effective for economizer free cooling supply air temperature reset when the
#ClgStgs parameter is set for 1 or more
G
Continuous indoor blower request, 24 VAC input switched from R
OCC
Occupancy request, 24 VAC input switched from R
Must have the OccMode parameter set for External to be effective
X
Hard lockout indicator, 24 volt output to a light thermostat LED
R
24 VAC hot for thermostat switching and power
If field-added external accessories for unit shutdown are used, 24 VAC hot
return from smoke detector, condensate overflow and/or user shutdown relay
switching in series
SD-24
If field-added external accessories for unit shutdown are used, 24 VAC hot
out for smoke detector, condensate overflow and/or user shutdown relay
switching in series
Unit wiring harness jumper plug for factory shutdown accessories must be
removed if the switching of field-added external accessories for unit shutdown
are wired between thermostat connection strip SD-24 and R
A
C
24 VAC common for thermostat power
INSTALLATION MANUAL ZX SERIES 6 - 12.5 Ton 60 Hertz R-410A
75
Johnson Controls Ducted Systems
Содержание ZX Series
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