IMPORTANT NOTE:
The UZC4 Zone Control System allows Heat Pump or Conventional Multi-Stage
thermostats to be wired to all Zones!
Thermostat demands to
stage up
, will always over-ride any programmed staging operation. The UZC4 will
remain in Multi-stage mode until that terminal is de-energized. If this occurs in dual fuel mode or emergency mode,
the UZC4 will stay in that mode until
all
Heating demands are satisfied. On the next heating cycle, the UZC4 will
attempt to activate 1st stage heat unless, Emergency Mode is still active, or the outdoor temperature is low and
OAS / DF has been selected. This comfort over-ride feature provides true versatility to your zoning system, and
gives the homeowner comfort control capability over the system.
Selecting the Options Using the DIP Switches - BANK2
1
1 < CS# > 2
Choose the number of Condensing Unit Stages
you want to control. Select
1
, if your CU has a
Y1
connection only. Select
2
, if
your CU has a
Y1 & Y2
connection.
NOTE1:
This feature must be set correctly for proper Timed & Outdoor Air Sensor staging
operations.
NOTE2:
Thermostat demands to
stage up
, will always Over-ride the Timer & OAS staging operations, unless the
50% rule has been enabled, or the Return air temperature limit has been exceeded.
NOTE3:
All
stage up
Operations depend upon
the correct setting of this switch.
HC < TSTAT > HP
Select the type of thermostats
you want to use. Select
HC
, if your thermostats are the standard Heat/Cool type. Select
HP
, if your
thermostats are Heat Pump types.
NOTE1:
You cannot mix thermostat types.
NOTE2:
You do not need HP thermostats to control
a Heat Pump.
NOTE3:
Thermostat demands to
stage up
, will always over-ride the Timer or OAS staging operations, unless the 50%
rule has been enabled.
NOTE4:
Thermostatic demands to
stage down
will be honored unless the Timer is in use.
2
3
O < RV > B
Choose the type of Reversing Valve
you want to control. Select
O
, if your heat pump reversing valve energizes in cooling and
defaults to heat mode. Select
B,
if your reversing valve energizes in heating and defaults to cool mode.
NOTE:
The UZC4 will hold
the “O” output or the “B” output continuously, even during idle periods, until a thermostatic demand to change modes is detected.
NOTE:
Proper setting of this switch is critical. The reversing valve will not function properly if this switch is not set correctly.
4
OFF < ZDL > ON
Select ON and the UZC4 will limit HVAC operations based on the total number of zones calling for conditioned air.
16% or 1/6 of the total number of zones (rounded up) must be calling for the same mode of operation, or the UZC4
will not
activate the HVAC system.
This feature only activates at 8 or more zones.
Select OFF if you do not want to utilize the Zone
Demand Limiter feature.
NOTE:
Zone 1 is not affected by this feature. Zone 1 demands are always honored.
ZDL example:
A zone system has 20 total zones and the ZDL feature is active; At least 4 zones must be calling for the same mode of
operation (Heat or Cool) or the UZC4
will not
activate the HVAC system.
18zone=3, 16zone=3, 14zone=3, 12zone=2, 10zone=2, 8zone=2.
5
RA < AUX RLY > DA
6
OFF < RAS > ON
If you connect an
OPTIONAL
Return Air Sensor to the UZC4
, then Select
ON
, and Choose to use the default set points
for Return Air Temperature Limit Operations, or choose to Offset those set points by 10 degrees higher at the next Dip Switch.
Refer to the data sheet included with the Return air sensor for installation details.
Mount the Return Air Sensor in the
return air duct as close to the Blower intake as possible, or in the blower cabinet. Read page 4 for Operational details.
7
If you connect an
OPTIONAL
Return Air Sensor
and
switch on
the “RAS” switch above; then choose “0” to accept the
default set points for Return Air Temperature Limits, or choose “+10” to Offset the default set points 10 degrees higher.
Refer to the data sheet included with the Return air sensor for installation details.
Read page 4 for Operational details.
8
0 < RA LIMIT > +10
ANY < FAN CTRL > Z1
8
Select which thermostat(s) can activate a demand for Continuous Fan Operation.
Choose “ANY”, and the UZC4 will
honor
any
thermostat demand to activate continuous fan, and only the dampers connected to that zone will open. All others
will close. Choose “Z1”, and the UZC4 will honor a demand to activate continuous fan from
zone 1 only
. All connected
dampers on all zones will open. Demands to activate continuous fan from any other thermostat will be ignored.
NOTE:
Continuous Fan Operations will only occur when there are no active or pending heat or cool operations.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 E-Mail- [email protected]
Select the control signal type you need, in order to activate your preferred Auxilary Relay function.
Choose RA (Reverse
Acting) for De-Humidification Control, or Choose DA (Direct Acting) for Humidification Control, depending on the control input signal
you require. Then connect your controlled device or circuit to the SPDT dry output contacts and achieve integrated control without
the need for 3rd party relays or specialty relays.
If this feature is not used, the switch must be in the DA position.
See Pages 14-16 for further information.
