Smart Equipment™ Ucb Details - York ZF Series Installation Manual

Table 36: Smart Equipment™ UCB Details
Limit, 24 VAC power and shutdown connections from unit wiring harness at left on upper edge of UCB
LIMIT
C
24V
SD 24
SD R
R
W1
W2
Y1
Y2
G
OCC
X
R
SD-24
C
POWER
Johnson Controls Ducted Systems
Description
Terminal Directional orientation: viewed with silkscreen labels upright
Monitored 24 VAC input through heat section limit
switch(es)
24 VAC, 75 VA transformer Common referenced
to cabinet ground
24 VAC, 75 VA transformer hot
24 VAC hot out for factory accessory smoke
detector, condensate overflow and/or user
shutdown relay switching in series
24 VAC hot return from factory accessory smoke
detector, condensate overflow and user shutdown
relay switching in series
24 VAC hot for switched inputs to the UCB
Terminal Thermostat connection strip on left edge of UCB
1st stage heating request, 24 VAC input switched
from R
2nd stage heating request, 24 VAC input switched
from R
1st stage cooling request, 24 VAC input switched
from R
2nd stage cooling request, 24 VAC input switched
from R
Continuous indoor blower request, 24 VAC input
switched from R
Occupancy request, 24 VAC input switched from
R
Hard lockout indicator, 24 volt output to a light
thermostat LED
24 VAC hot for thermostat switching and power
If field-added external accessories for unit
shutdown are used, 24 VAC hot out for smoke
detector, condensate over- flow and/or user
shutdown relay switching in series
24 VAC common for thermostat power
LEDs on left edge of UCB
Green UCB power indicator
Function & Comments
If voltage is absent, indicating the heat section is over-
temperature, the UCB will bring on the indoor blower
Connects through circuit traces to thermostat connection strip C
and indoor blower VFD pin C
Powers the UCB microprocessor, connects through circuit trace
to the SD 24 terminal
Connects through circuit trace to thermostat connection strip
SD-24. A wiring harness jumper plug connecting SD 24 to SD R
is in place if factory accessories for unit shutdown are not used -
this jumper plug must be removed if the switching of field-added
external accessories for unit shutdown are wired between
thermostat connection strip SD-24 and R
Connects through circuit trace to the R terminal on the upper left
of the board
Connects through circuit trace to the thermostat connection
strip R terminal, right FAN OVR pin, right HPS1 pin, right HPS2
pin, lower DFS pin and lower APS pin
Not effective for cooling-only units
Not effective for cooling-only units or units with single-stage
heat sections
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
Must have the OccMode parameter set for External to be
effective
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
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
thermo- stat connection strip SD-24 and R
Lit indicates 24 VAC is present at C and 24V terminals
5326602-XIM-B-1019
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