Lochinvar NSF SSB-i & s--01 - Manual (Page 6)

6
HIGH TEMPERATURE LIMIT SWITCH
RECALIBRATION
If the temperature in the heater exceeds 210ºF (99ºC), the high
temperature limit will shut off the power. The switches must be
manually reset by pushing the red buttons. The limit switch has been
calibrated at the factory and should not require adjusting. If the
calibration changes and must be re-adjusted, the procedure is as
follows:
Models 4-18kW
Hold lock nut (F) and turn calibrating screw (G) clockwise 1/8
turn to increase set point 7ºF (3.9ºC), or hold screw (G) and turn
nut (F) clockwise.
Model 24 - 58kW
Turn adjustable screw (D) clockwise to raise set point
- 1/8 turn equals about 7ºF (3.9ºC).
REMOVAL
1. Shut off power and drain tank; remove leads from
terminals (E).
2. Remove two screws holding the switch on the bracket.
3. Loosen nut (A), then remove bushing (B) from tank.
The high limit switch and sensor bulb (C) can now be
removed from tank.
INSTALLATION
1. Pull end of sensor bulb (C) into recess in bushing (B).
2. Insert bushing (B) and sensor bulb into tank; holding
sensor bulb in place with capillary tube, tighten bushing (B).
3. Lock sensor bulb and capillary tube in place by
tightening nut (A).
4. Replace switch on bracket. Replace leads on terminals.
Be sure tank is filled with water before turning on power.
CAUTION !!
Do not overtighten nut, or sleeve inside of bushing
will cut through tubing.
CAUTION !!