9
7.3.1 Thermostat Replacement
Use the following thermostat replacement proce-
dure when the sensing bulb is located WITHIN the
bathpan. Some models only have externally
mounted sensing bulbs on the underside of the
pan, if this is the case follow procedure 7.3.2.
CAUTION:
CARE MUST BE EXERCISED WHEN HANDLING
THE THERMOSTAT CAPILLARY, SINCE A
SHARP BEND WILL CRIMP OFF THE FLOW OF
THE HYDRAULIC OPERATING MEDIUM. TO
AVOID TWISTING THE CAPILLARY OR
DAMAGING O-RING, HOLD THE FITTING
UNDER THE BATH STATIONARY, AND FIRMLY
TIGHTEN LOCKNUT INSIDE BATH CHAMBER.
DO NOT OVER-TIGHTEN, AS O-RING
COULD BE SQUEEZED OUT OF POSITION,
CAUSING BATH TO LEAK. UNDERTIGHTENING
WILL ALSO CAUSE THE BATH TO LEAK.
A. Put switch in "OFF" position and disconnect
power to bath.
B. Remove shelf and drain bath.
C. Remove thermostat control knob by loosening
two set screws on knob.
D. Place bath on its side and remove bottom plate
and insulation to gain access to thermostat
fitting.
E. Remove two screws fastening thermostat to
control panel.
F. Remove wires from thermostat terminals. Mark
location of wire leads.
G. Hold the fitting under the bath stationary, unscrew
locknut inside bath chamber, and remove from
capillary.
H. Feed thermostat capillary out through hole in
bottom of chamber.
I. Replace O-ring on bottom side of chamber with
new Viton O-ring.
J. Complete installation by reversing above
procedure. Be certain all wiring is away from
heater. Insulation must be replaced between
heater and bottom plate to prevent possible
wire shorting.
7.3.2 Thermostat Replacement
Use the following procedure when the sensing
bulb is located UNDER the pan.
A. Put the power in the "OFF" position and
disconnect power to the bath.
B. Turn bath upside down and remove bottom plate
and fiberglass insulation.
C. Mark the location of the wire leads on the
thermostat and disconnect.
D. Remove thermostat control knob by loosening
two set screws on knob.
E. Remove two screws fastening thermostat to
control panel.
F. Loosen the two hex nuts holding thermostat bulb
bracket and pull the thermostat and bulb out
from behind the control panel.
G. Mount the new thermostat by reversing steps A
through G.
CAUTION:
MAKE SURE THE WIRE LEADS DO NOT TOUCH
THE HEATER ELEMENT.
To Next Page
Loading...
Need help?
General
