Johnson Controls ZF Series Installation Manual page 68

5566018-YIM-B-1018
Smart Equipment™ UCB - heat section connections
Location Label
H1 24 VAC hot output for heat section stage 1
H2 24 VAC hot output for heat section stage 2
H
24 VAC hot input confirming heat section
MV
operation
Smart Equipment™ UCB - pin cooling and fan output
Location Label
24 VAC hot output for the condenser fan contactor
CN-FAN
coil
AUX HGR 24 VAC hot output for hot gas reheat components Effective only for reheat units, output with reheat operation
24 VAC hot output for indoor blower contactor coil/
FAN
indoor blower VFD enable relay coil
I
C1 24 VAC hot output for compressor 1
C2 24 VAC hot output for compressor 2
Smart Equipment™ UCB - refrigerant circuit safety switch and indoor blower overload connections
Location Label
24 VAC hot out for refrigerant circuit 1 High
HPS1
(right pin)
Pressure Switch
24 VAC hot return from refrigerant circuit 1 High
HPS1
(left pin)
Pressure Switch
24 VAC hot out for refrigerant circuit 1 Low
LPS1
(right pin)
Pressure Switch
J
24 VAC hot return from refrigerant circuit 1 Low
LPS1
(left pin) Pressure Switch
24 VAC hot out for refrigerant circuit 2 High
HPS2
(right pin) Pressure Switch
24 VAC hot return from refrigerant circuit 2 High
HPS2
(left pin)
Pressure Switch
68
Description
Description
Description
Function and comments
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 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
Function and comments
Output with either C1 or C2 output; interrupted during defrost cycle for
heat pump units
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
Function and comments
Connects through circuit trace to the R terminal
Input is only considered if C1 output is needed; input must be present
to allow C1 output. Three HPS1 trips in a two hour period cause a
"High Pressure Switch 1 Lockout" and C1 output is then prevented
until alarm reset. Connects through circuit trace to the right LPS1 pin.
Connects through circuit trace to the left HSP1 pin
Input is only considered after 30 seconds of C1 output; afterwards,
input must be present to allow C1 output. Three LPS1 trips in a one
hour period cause a "Low Pressure Switch 1 Lockout" and C1 output
is then prevented until alarm reset.
Not effective for one stage compressor UCBs. Connects through
circuit trace to the R terminal
Not effective for one stage compressor UCBs. Input is only
considered if C2 output is needed; input must be present to allow C1
output. Three HPS2 trips in a two hour period cause a "High Pressure
Switch 1 Lockout" and C2 output is then prevented until alarm reset.
Connects through circuit trace to the right LPS2 pin.
Johnson Controls Ducted Systems