T-
Stat LLC User’s Manual Rev
3.2, 04/10/18
Page | 4
1.0 Overview
The Quest Controls Lead/Lag control thermostat is designed for controlling two single stage HVAC
systems. It is an easy to use thermostat for remote shelters that require a simple to use lead/lag
controller with a wide profile operating range for cooling.
1.2 Features and Benefits
•
Controls two single-stage HVAC systems for Fan, Cool and Heat.
•
Powered from the HVAC 24VAC transformers.
•
Automatic lead change every 24 hours.
•
LCD display for current operating mode and shelter temperature readings.
•
Comfort mode to allow “Occupied” settings for a
one hour timed duration.
•
Five button keypad for navigation to other status screens.
•
Built in zone temperature.
•
All configurations and setpoints are stored in non-volatile flash memory and are not field
changeable.
2.0 Installation / Wiring
The T-Stat LLC is a simple application specific controller designed to control two Single -Stage
Conventional HVAC systems.
1-1/16"
1-1/2"
2-1/4"
3-1/4"
Back mounting plate 5-3/8", 5-1/2" with cover
B
a
c
k
m
o
u
n
ti
n
g
p
la
te
3
-5
/8
",
3
-7
/8
"
w
it
h
c
o
v
e
r
1-9/16"
1/2"
UP
Figure 1
–
Back Plate Mounting
