T822/TS822 Spec Sheet

T822, TS822 HEATING/COOLING THERMOSTATS
5 68-0095-2
Fig. 8. TS822A in typical heating application.
SETTINGS AND ADJUSTMENTS
Temperature Setting (All Models)
Move the temperature setting lever to the desired control point
on the temperature scale.
NOTE: On positive Off models, the control circuit is broken
when the lever is moved to the extreme low end of
the temperature scale.
T822F System Switching
The Fan switch control system operation as follows:
Auto: For gas or oil heating systems, the fan operates in
response to the thermostat call for cooling.
On: The fan operates continuously.
Heat Anticipator Setting (T822D,F,G Only)
IMPORTANT
— The T822D,F,G has an adjustable heat anticipator
and operates correctly only if the anticipator is
adjusted to match the current draw of the primary
control.
— Use the T822D,F,G only on systems with current
draws that fall within the range of the heat anticipa-
tor. Do not use this device on Powerpile (millivolt)
systems.
1. A current rating is usually stamped in the nameplate of
the primary control. Set the adjustable heat anticipator
indicator to match the value given on the nameplate.
2. If the current rating is not available, proceed as follows
to determine the rating:
a. Turn off the power.
b. Wire thermostat, except connection to W terminal,
but do not mount it on the wall.
c. Connect ammeter between W wire and W terminal
on thermostat in series with primary control.
d. Prepare system for operation.
e. Turn on power.
f. Turn System switch to Heat.
g. Increase thermostat setpoint, as necessary, to start
system operating.
h. With system operating through ammeter, wait one
minute, then read ammeter.
i. Turn System switch to Off and turn off power.
j. Adjust heat anticipator to match reading on amme-
ter.
k. Disconnect ammeter, reconnect W wire, and mount
thermostat. Continue with system checkout.
NOTE: The heat anticipator may require further adjustment
for best performance. To lengthen burner-on time,
move indicator in direction of longer arrows but not
more than a half-scale marking at a time. To shorten
burner-on time, move indicator in opposite direction.
CONNECT R AND W TERMINALS FOR 750 mV SYSTEMS. CONNECT
R AND Y TERMINALS FOR 250/500 mV SYSTEMS.
M1294
TS822A
TEMP. FALL
H1
R
Y
W
LIMIT
CONTROL
TH
TH/
PP
PP
MILLIVOLTAG
E
GENERATOR
MILLIVOLTAGE
GAS CONTROL
PILOTSTAT
CONTROL
(IF USED)
1
1