41
ST 5220
QM 1336.rev.01
1
Adjusting Starting Temperatures
The heater starting temperature is the temperature at which the heating
units turn on (see diagram above). The Heater A starting temperature is
bounded above by the off temperature — 0.5°F and below by the off
temperature — 20
o
F. The Heater B starting temperature is bounded above
by the Heater A starting temperature — 0.5°F and below by the Heater A
starting temperature — 20
o
F.
n
Set selection knob to HEATER
A — START TEMP. The cur-
rent starting temperature for
Heater A is displayed, alternat-
ing with the letters "Ht.A".
n
Use the adjustment knob to ad-
just the starting temperature to
the desired value.
n
Set selection knob to HEATER B — START TEMP. The current starting
temperature for Heater B is displayed, alternating with the letters "Ht.b".
n
Use the adjustment knob to adjust the starting temperature to the de-
sired value.
2
Adjusting Off Temperature
The heater off temperature can provide substantial energy savings if cor-
rectly adjusted according to the outside temperature. It is the temperature
below the set point at which the heating units turn off (see diagram above).
The off temperature is bounded above by the set point + 10°F and below
by the set point — 20
o
F.
n
Set selection knob to HEATER A/B — OFF TEMP. The current off
temperature is displayed, alternating with the letters "Ht.A".
n
Use the adjustment knob to adjust the off temperature to the desired
value.
