HP < SYSTEM > GAS
DF < HP > CONV
Choose the type of HVAC system you want to control. Select HP, if your system is any type of heat pump. Select GAS,
if your system is a any type of Gas / Oil furnace, or any straight Electric furnace or Hydronic (hot water / steam)
heating system.
If you chose “HP” at switch #1, then choose the type of Heat Pump you want to control. Select DF, if your system is a Dual Fuel
heat pump with Gas or Oil furnace backup heat. Select CONV, if your system is a Conventional heat pump with Electric resistance
backup / supplemental heat. Also applies to Ground source / Geothermal heat pumps with Electric backup heat.
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1
2
3
4
5
OFF < FAN PRG > ON
Select ON, if you want the UZC4 to force the indoor blower ON at the end of a heat/cool call to assist the zone purge cycle.
Selecting OFF will allow the HVAC system to operate the indoor blower, without interference from the UZC4.
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CONTINUED ON NEXT PAGE...
Selecting the Options Using the DIP Switches - BANK1
90S < PURGE > 180S
Select 90S or 180S, if you want the zone dampers to hold position for 90 seconds or 180 seconds at the end of any heat or cool call.
This allows the HVAC system to purge the remaining hot or cold air, into the zone(s) that were calling for it.
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Select OAS, if you want to delay multi-stage operations based on the outside air temperature sensor. Select TIMER, if you want to
delay stage up based on the adjustable on-board timer. Both features are very useful when using single stage thermostats on all zones.
NOTE1: Y2/W2 stage up defaults to a 30 minute delay, when OAS is chosen. NOTE2: An optional Outside Air Sensor (Part#OAS) is required
to use the OAS feature. NOTE3: Thermostat demands to stage up, will always over-ride the Timer or OAS staging operations, Unless the
50% rule has been enabled, or the Return Air temperature limit has been exceeded. NOTE4: Thermostatic demands to Stage Down will be
honored unless the Timer is also in use. NOTE5: Disable the Timer by setting to OFF, and the UZC4 will obey Stage up & Stage down
demands via the thermostats only!
OAS < STAGES > TMR
OFF < 50% RULE > ON
Select OFF, if you do not want to inhibit 2nd stage compressor cooling/heating operations based on the total number of zones calling.
Select ON, if you want to inhibit 2nd stage compressor cooling/heating operations based on the total number of zones calling. Half or more of
the total number of thermostats must be calling or stage up will not occur. NOTE 1: In All Modes, the 50% rule occurs between Y1 and Y2.
NOTE2: In Gas mode the 50% rule occurs between W1 &W2. NOTE3: Emergency mode is never affected by the 50% rule.
OFF < SAS > ON
Select OFF, if you do not want to use the Supply air sensor included with the UZC4 Zone Control system. Select ON, if
you want to use the included Supply air sensor. Refer to the data sheet included with the Supply air sensor for
installation details. Refer to page 2 for details on Supply air Sensing Limit Controls and settings. Mount the Supply
Air Sensor in the discharge duct and/or plenum.
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GAS < FAN > HYDRONIC
Select GAS, if your HVAC system is a gas or oil forced air furnace. Select HYDRONIC, if your HVAC system has a hot
water / steam coil, or straight electric heat with no indoor blower support. Useful when you need the indoor blower to run
automatically in heat mode, just like it does in cool mode. NOTE: When you select HP on dip switch #1, the indoor fan
mode is automatically set for you. If so, then leave this switch in the factory GAS setting.
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362 E-Mail- info@ewccontrols.com
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