S9360B, S9361B, S9370B, S9371B, S9380B, S9381B INTEGRATED WATER HEATER CONTROLLERS
15
69-1792—09
Mounting Sensor and
Thermowell
The remote upper temperature sensor is installed in
an immersion well (Fig. 9) that extends into the tank to
help prevent stacking.
Immersion Well Fitting
The immersion well must snugly fit the sensing bulb
for good thermal response. Install as follows:
1.
Use tapping provided by tank manufacturer, if
possible, or select an area where typical water
temperature is best measured.
2.
If tank is filled, drain to below point where bulb
will be installed.
3.
Screw well into tank.
4.
Insert bulb into well, pushing tubing until bulb
bottoms in well.
5.
Attach mounting clamp end of well spud.
6.
With mounting clamp attached to well spud
(make sure jaws of clamp hook over ridge at end
of spud, as shown at points A in Fig. 9), adjust
sensing leadwire to fit through mounting clamp
groove, as shown at point B in Fig. 9.
7.
Tighten draw nut until mounting clamp is firmly
attached to well spud and tubing is held securely in
place.
CAUTION
Do not secure draw nut so tightly that
mounting clamp collapses tubing.
Fig. 9. Immersion well fitting for sensor.
Wiring
Disconnect power supply before installation to
prevent electrical shock or equipment damage. All
wiring must comply with local codes and ordinances
regarding wire size, type of insulation, enclosure, etc.
OPERATION AND
CHECKOUT
Operation
The S9360B, S9361B, S9370B, S9371B, S9380B, and
S9381B continuously monitor the temperature of the
water heater and enable the burner based on this
temperature data. In general, when the temperature is
low a “Call for Heat” is activated, which activates the
ignition portion of the control module, ignites the
burner, and heats the water in the tank until the
setpoint temperature is achieved. At this point the call
for heat is de-activated, the ignition module
completes the heating cycle, returns to idle and waits
for the temperature to drop again.
See Fig. 10 for a graphical representation of a simple
control cycle. Note that the setpoint differential may
vary based on OS number.
High Limit Controller
All models include a 3-wire temperature sensor
interface, “Sensor 1,” which is utilized for High Limit
functionality in addition to the thermostatic control of
the water heater burner. If the temperature sensor ever
indicates a temperature above the maximum limit
then the control enters over temperature mode. In over
temperature mode no heating will occur.
Fig. 10. Basic control algorithm example.
SENSOR WIRES
M23086
HEAT-CONDUCTIVE COMPOUND
(OPTIONAL)
BOILER
IMMERSION
WELL
SENSOR
B
A
M24053A
SETPOINT
CALL FOR HEAT
DE-ACTIVE ON
TEMPERATURE RISE
CALL FOR HEAT
ACTIVE ON
TEMPERATURE FALL
70°F (21°C)
200°F (93.3°C)
15°F (8°C)
DIFFERENTIAL
