EWC Controls ULTRA-TALK 3000 Technical Bulletin page 8

The UT3000 has built-in Delay Timers
Built-In
Delay Timer
that insure safe HVAC system operation.
Settings
*Purge Delay Timer
EWC recommends
*Short Cycle Timer
that you turn off all
thermostat time
*Supply Air Limit Delay
delays and let the
UT3000 built-in Delay
*Changeover Timer
Timers protect the
HVAC system.
*Opposing System
Service Timer
Purge
At the end of any cooling or heating
Delay
operation, the UT3000 will hold the last
calling zone open for 210 seconds.
Timer
Short Cycle When all Zones are satisfied, the
Timer
UT3000 will not restart the same call for a
minimum of 2 minutes.
If a Heating or Cooling operation cycles
Supply Air
Limit Timer
down due to excessive Supply Air
temperature, the UT3000 will not re-start
the HVAC system for 3 minutes.
Changeover
At the end of a call, a 4 minute timer is
Timer
started and the UT3000 will not switch to
the opposite mode of system operation
until the timer has expired.
Opposing
A 20 minute delay must expire, or the active
System
zone(s) must satisfy, before the UT3000
will honor a thermostat demand to
Service
changeover to the opposite mode of
Timer
system operation.
The UT3000 includes the ONE ZONE
One Zone
feature that allows a Commercial Grade
Mode
Thermostat or Time Clock to Force the
Feature
UT3000 into the ONE ZONE MODE during
Setback Periods. In compliance with
California Title 24, when the One Zone
Terminal is energized, the UT3000 ignores
all Zone T-stat demands except for Zone 1.
All Zone Dampers are Forced Open. When
the One Zone terminal is de-energized, the
UT3000 will resume Zoning Operations.
The UT3000 includes a SPDT Indoor Air
Ancillary
Quality dry relay with a digital or 24v input
IAQ
Trigger. The IAQ relay can be used to
Dry Relay
Interlock and Control various IAQ devices.
Functions
The Indoor Fan will operate automatically,
whenever the Relay is Triggered.
NOTE: The UT3000 must observe a Heating,
Cooling or Fan demand from any one of the
zone
relay input, before the IAQ relay will trigger!
8
EWC Controls Inc. 385 Highway 33 Englishtown, NJ 07726 800-446-3110 FAX 732-446-5362
210 seconds, fixed.
2 minutes, fixed.
3 minutes, fixed.
4 minutes, fixed.
20 minutes, fixed.
TIMER DEFINITIONS
thermostats, in addition to the IAQ
The Diagrams shown below reflect different ways to utilize the IAQ Dry
Relay to your advantage. Other wiring is not shown for clarity.
UT3000
R
Whole
C
House
Humidifier
Class 2
IAQ RELAY
Low Voltage
NC
wiring only!
NO
C
SYSTEM
Most basic "Flow Thru" humidifiers require a separate 10va or 12va transformer to operate the water
solenoid valve or the media motor. EWC Controls highly recommends that you utilize it!
But if you don't have a lowVA transformer you can steal 24v from the UT3000. You can power and
control the basic humidifier as shown below, if you have provided a "dedicated" 60va transformer to
Each communicating thermostat can digitally enable & trigger the IAQ relay to operate the
humidifier. Program the communicating thermostats to Humidify with Heat only or Independent.
COM COM PO PO PC PC
Ultra-Zone
1 1 4 4 6 6 Damper
Model URD
Fresh Air IAQ Solution using a
Field Supplied CO2 Monitor
(The IAQ relay will activate when it
detects a "Fan" call from any zone )
NOTE: If the IAQ relay is used for fresh air, it cannot be used for humidifier control.
UT3000
ERV
R
or
HRV C
IAQ RELAY
Class 2
Low Voltage NC
wiring only!
NO
C
SYSTEM
The IAQ relay
contacts are dry!
Fresh Air IAQ Solution using an ERV.
Use a jumper to enable the IAQ relay.
(Any call for conditioned air will
trigger the IAQ relay and start the Ventilator)
NOTE: If the IAQ relay is used for fresh air, it cannot be used for humidifier control.
Communicating
UT3000
ZONE
1
FIELD
JUMPER
C
2
1
R
power the UT3000.
Field Jumper
UT3000
ZONE
UT3000
1
C
R
W/E
O/B
C
Y
IAQ RELAY
R
NC
G
NO
Relay
C
ONE
ZONE
SYSTEM
Communicating
UT3000
ZONE
1
C
2
1
R
ZONE
1
C
W/E
O/B
Y
R
G
Relay
ONE
ZONE
E-Mail- info@ewccontrols.com
Thermostat
2
C 1 R
ACI
A/CO
2
CO
2
Sensor
860ppm
Thermostat
2 1 R
C
Field Jumper
may be required