Johnson Controls ZY Series, Installation Manual

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Table 63: Smart Equipment™ UCB - pinned connections
Location Label Description Function and comments
RAH+ Return Air Humidity input from 0-10 VDC @ 0-100% RH sensor
Input required for reheat units, optional in all other units, may be a communicated
value. Used in return air enthalpy calculation, temperature/humidity setpoint reset,
reheat operation.
DCT PRS+ Supply Duct Pressure input from 0-5 VDC @ 0-5” w.c. sensor Input required for variable air volume units. Used in VAV indoor blower operation.
DFS
(upper pin)
24 VAC hot return from Dirty Filter Switch
Optional input; switch closure for greater than 15 seconds during indoor blower
operation initiates a notification alarm
DFS
(lower pin)
24 VAC hot out for Dirty Filter Switch Connects through circuit trace to the R terminal
APS
(upper pin)
24 VAC hot return from Air Proving Switch
When this optional input is enabled: the air proving switch must close within 30
seconds of initiation of indoor blower operation and not open for greater than 10
seconds during indoor blower operation to allow heat/cool operation and prevent an
“APS open” alarm; the air proving switch must open within 30 seconds of termination
of indoor blower operation to prevent an “APS stuck closed” notification alarm
APS
(lower pin)
24 VAC hot out for Air Proving Switch Connects through circuit trace to the R terminal
C Common for the VFD output Negative of the VDC circuit for the VFD output
VFD
2-10 VDC (0-100%) output for the indoor blower Variable
Frequency Drive
Output is active with indoor blower operation. For CV units: this output provides
stepped IntelliSpeed control of the indoor blower VFD based on fan-only, cooling stage
and heating stage outputs. For VAV units: this output provides control of the indoor
blower VFD based on supply duct static pressure input and setpoint.
E
VFDFLT 24 VAC hot input from the normally open VFD alarm contact
The VFD alarm contact switches from R within the unit wiring harness. 24 VAC input
results in unit shutdown and a “VFD fault” alarm
Table 64: Smart Equipment™ UCB - USB connector
Location Label Description Function and comments
J10 Type A female Universal Serial Bus connector
Used for backup, restoration, and copying of board parameters as well as board software
updating through a flash drive
F
J15 Factory wired SA Bus connector
Table 65: Smart Equipment™ UCB - 24 V terminal
Location Label Description Function and comments
G 24 V FOR OUTPUTS
24 VAC hot for H1, H2, CN-FAN, AUX HGR, FAN C1 and C2
output relay contact switching Output relay circuitry is isolated from other UCB components and the 24
VAC hot source may be from a second transformer in the unit
Table 66: Smart Equipment™ UCB - heat section connections
Location Label Description Function and comments
H1 24 VAC hot output for heat section stage 1
Not effective for cooling-only units. Output if demand is present and permissions allow one
stage or two stages of heat section operation
H2 24 VAC hot output for heat section stage 2
Not effective for cooling-only units or units with single-stage heat sections. Output if demand
is present and permissions allow two stages of heat section operation
H
MV 24 VAC hot input confirming heat section operation
Sourced from gas valve in gas heat units or first stage heat contactor in electric heat units.
Input within 5 minutes from initiation of H1 output initiates the “Heat On Fan Delay” timer,
loss of input following the termination of H1 output initiates the “Heat On Fan Delay” timer,
no input within 5 minutes from initiation of H1 output initiates an “Ignition Failure” alarm,
input for longer than 5 minutes without H1 output initiates a “Gas Valve Mis-wire” alarm
Table 67: Smart Equipment™ UCB - pin cooling and fan output
Location Label Description Function and comments
CN-FAN 24 VAC hot output for the condenser fan contactor coil
Output with either C1 or C2 output; interrupted during defrost cycle for heat pump
units
AUX HGR 24 VAC hot output for hot gas reheat components Effective only for reheat units, output with reheat operation
FAN
24 VAC hot output for indoor blower contactor coil/indoor
blower VFD enable relay coil
Output with heat/cool operation, G input or schedule demand
C1 24 VAC hot output for compressor 1
If demand is present and permissions allow compressor 1 operation; output with
compressor cooling, comfort ventilation cooling, reheat or heat pump heating demands
I
C2 24 VAC hot output for compressor 2
Not effective for one stage compressor UCBs. If demand is present and permissions
allow compressor 2 operation; output with compressor cooling, comfort ventilation
cooling or heat pump heating demands
INSTALLATION MANUAL ZY SERIES 3 - 10 ton 60 Hertz R-410A 106
Johnson Controls Ducted Systems