Johnson Controls ZL Series Installation Manual page 58

Table 37: Smart Equipment™ ucb details (continued)
CC1+
EC1+
CC2+
EC2+
RAH+
DCT PRS+
DFS (upper pin)
DFS (lower pin)
APS (upper pin)
APS (lower pin)
C
VFD
VFDFLT
24V FOR OUTPUTS
H1
H2
MV
CN-FAN
AUX HGR
FAN
C1
C2
Pin Refrigerant circuit safety switch and indoor blower overload connections at center on lower edge of UCB
HPS1(right pin)
58 Installation Manual ZL Series 7.5- 12.5 Ton 60 Hertz R-410A
Description
#1 refrigerant circuit Condenser Coil temperature
sensor input from 10KΩ @ 77°F, Type III
negative temperature coefficient thermistor
#1 refrigerant circuit Evaporator Coil temperature
sensor input from 10KΩ @ 77°F, Type III
negative temperature coefficient thermistor
#2 refrigerant circuit Condenser Coil temperature
sensor input from 10KΩ @ 77°F, Type III
negative temperature coefficient thermistor
#2 refrigerant circuit Evaporator Coil temperature
sensor input from 10KΩ @ 77°F, Type III
negative temperature coefficient thermistor
Pinned connections on right edge of UCB
Return Air Humidity input from 0
VDC to 10 VDC @ 0-100% RH sensor
Supply Duct Pressure input from 0 VDC
to 5 VDC @ 0 in. to 5 in. w.c. sensor
24 VAC hot return from Dirty Filter Switch
24 VAC hot out for Dirty Filter Switch
24 VAC hot return from Air Proving Switch
24 VAC hot out for Air Proving Switch
Common for the VFD output
2 VDC to 10 VDC (0-100%) output for the
indoor blower Variable Frequency Drive
24 VAC hot input from the normally open VFD alarm contact
Terminal at lower right corner of UCB
24 VAC hot for H1, H2, CN-FAN, AUX HGR,
FAN C1 and C2 output relay contact switching
Pin Heat section connections at right on lower edge of UCB
24 VAC hot output for heat section stage 1
24 VAC hot output for heat section stage 2
24 VAC hot input confirming heat section operation
Pin Cooling and fan output connections at right on lower edge of UCB
24 VAC hot output for the condenser fan contactor coil
24 VAC hot output for hot gas reheat components
24 VAC hot output for indoor blower contactor
coil/indoor blower VFD enable relay coil
24 VAC hot output for compressor 1
24 VAC hot output for compressor 2
24 VAC hot out for refrigerant circuit 1 High Pressure Switch
Johnson Controls Ducted Systems
Function and comments
Input required for heat pump units, not required for A/
C units; 3.625 VDC reading CC1+ to CC1– with open
circuit. Used in heat pump demand defrost calculation.
Input required for operation; 3.625 VDC reading EC1+ to EC1–
with open circuit. Used in suction line temperature safety.
Input required for 2-compressor heat pump units, not required for 2-
compressor A/C units, not active for 1-compressor units; 3.625 VDC reading
CC2+ to CC2– with open circuit. Used in heat pump demand defrost calculation.
Input required for operation of 2-compressor units, not active
for 1-compressor units; 3.625 VDC reading EC2+ to EC2–
with open circuit. Used in suction line temperature safety.
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.
Input required for variable air volume
units. Used in VAV indoor blower operation.
Optional input; switch closure for greater than 15 seconds
during indoor blower operation initiates a notification alarm
Connects through circuit trace to the R terminal
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 in- door 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
Connects through circuit trace to the R terminal
Negative of the VDC circuit for the VFD output
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.
The VFD alarm contact switches from R within the unit wiring
harness. 24 VAC input results in unit shutdown and a VFD fault alarm
Output relay circuitry is isolated from other UCB components and
the 24 VAC hot source may be from a second transformer in the unit
Not effective for cooling-only units. Output if demand is present and
permissions allow one stage or two stages of heat section operation
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
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 Off 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
Output with either C1 or C2 output; interrupted
during defrost cycle for heat pump units
Effective only for reheat units, output with reheat operation
Output with heat/cool operation, G input or schedule demand
If demand is present and permissions allow compressor
1 operation; output with compressor cooling, comfort
ventilation cooling, reheat or heat pump heating demands
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
Connects through circuit trace to the R terminal