Installation and Operation Manual
●
UNI2-VAV Electronic Thermostat
Nailor reserves the right to change any information concerning product or specification without notice or obligation.
Nailor reserves the right to change any information concerning product or specification without notice or obligation.
IOM-UNIVAVETINST
Date: 8-2021
Supersedes: NEW
4 of 12
The UNI2-VAV electronic thermostat
is designed to work with the VAV diff user. Depending on the applica� on, the UNI2-VAV
ELECTRONIC THERMOSTAT can be confi gured to modulate the damper actuator or provide two- posi� on control. The UNI2-VAV
ELECTRONIC THERMOSTAT should be installed in a zone being served by the damper or diff user and in a loca� on that represent
the ambient space temperature. It should not be installed in an area where dra� s are present, near the fl oor, behind doors or on
an external wall.
The UNI2-VAV ELECTRONIC THERMOSTAT contains a set of dip switches numbered 1 through 8. Only dip switches 1, 2, 3, 6 and 7
are ac� ve. Switch 1 is used to lock the thermostat a� er setup is complete. When the thermostat is locked, only setpoint changes
and status func� ons can be accessed by the user. Switch 2 is used to display the space temperature, duct temperature and setpoint
in Celsius or Fahrenheit. Switch 3 is used to select two-posi� on or fully modula� ng damper control. Switch 6 is used to control the
display of Heat and Cool. Switch 7 is used to control the display of the space temperature.
HOW IT WORKS:
The UNI2-VAV ELECTRONIC THERMOSTAT is a single setpoint, auto-changeover thermostat. The thermostat wires to a factory
mounted actuator board on a zone damper of VAV diff user that uses a 3-wire, fl oa� ng point actuator. A duct sensor is wired
to the actuator board. The thermostat uses the sensor to determine whether the temperature in the duct is compa� ble with
the thermostat call. For example, if the thermostat calls for cooling and the duct temperature is below 72
°
F, the damper will
be allowed to drive open; otherwise, the damper will maintain its minimum posi� on. The same applies for a hea� ng call. The
temperature in the duct must be above 72
°
F or the thermostat will keep the damper at its minimum posi� on.
SPECIFICATIONS
UNI2-VAV Electronic Thermostat specifi cati ons are subject to change without noti ce.
Input voltage:
24 VAC 50/60 Hz +/- 15%
Relay ra� ng:
24 VAC @ 1A maximum per relay
Opera� ng temperature
: 32
°
to 122
°
F
Opera� ng RH:
0 - 95% (non-condensing)
LCD Display size:
2-3/4" W x 1-7/8" H
Accuracy:
+/- 1
°
@ 77
°
F
TERMINAL DESIGNATIONS
Thermostat Subbase
The thermostat has dedicated screw terminals located on the subbase to facilitate ease of wiring to the actuator board mounted
on the damper of diff user. When wiring the thermostat to the actuator board, use standard 18-8 thermostat wire (verify with local
codes if plenum-rated wire is required).
MODBUS
MODBUS
HEATING RELAY
COOLING RELAY
DUCT SENSOR
DUCT SENDOR
REMOTE SENSOR
REMOTE SENSOR
24 VAC (COMMON)
24 VAC (HOT)
POWER OPEN
POWER CLOSE
Temperature sensor:
10K NTC Type II
Control range:
36
°
F to 96
°
F
Backlight:
Blue Electro Luminescent
Backlight life:
3,000 hours to half brightness
Approvals:
FCC Part 15 C-� ck
Dimensions:
4.0
"
H x 4.375
"
W x 0.875
"
D