Leslie Controls Temperature Fixed and Adjustable Proportional band type - Manual (Page 7)

7
Figure 5 - Body assembly RTP - DTP Types, showing
adjustable proportional band mechanism
3.
Place diaphragm plate (1) on diaphragm complete
(raised face downward). Insert screws (3) and turn
down into body threads just enough to hold diaphragm
plate snug. DO NOT overtighten as this will cause
snap in diaphragm with possible erratic response
resulting.
4.
In R and RTP, etc. types assemble lever spring (7) and
lever (11) to body, then insert fulcrum pin (26) in
holes in body and lever. Test action of lever. It should
be smooth and free. Check lever clearance as
described under “Setting Lever Clearance”*.
In D, DPT, etc. types assemble lever (11) to body and
insert fulcrum pin (26). Test action of lever. It should
be free and smooth. Check lever clearance as
described under “Setting Lever Clearance”*. Then
assemble lever spring (7) on lever, insert screw (8)
through spring and into diaphragm plate (1). Tighten
screw.
* If lever clearance is correct DO NOT DISTURB
adjustment.
5.
Reassemble cover (6) to body. Insert screw (12).
Tighten. Reconnect operating medium tubing (if
disconnected). Readjust as described under
“OPERATION”.
HOW TO SET LEVER CLEARANCE
NOTE: Lever setting is factory set. Do not disturb if
dimension corresponds to that shown below for the
particular temperature pilot.
* To adjust when necessary, subject tube of temperature
pilot to a temperature of approximately 70°F then turn
adjusting screw (9) outward until it is clear of diaphragm
complete (2) and proceed as follows (See Figure 7).
LEVER CLEARANCE ADJUSTMENT
NOTE: Thermo tube must be at room temperature while
making lever clearance adjustments.
For Reverse Acting Types – R, RT, RTP, etc.
1.
Loosen temperature adjusting knob lock screw and
remove knob.
2.
Remove cover screw and lift off cover.
3.
Move temperature adjusting screw upward until
bottom of screw is no longer in contact with
diaphragm.
4.
Check dimension “A” with a scale. Distance from
bottom of lever to top of diaphragm plate should be
5/32”.
5.
If dimension is incorrect, loosen adjusting screw lock
nut and screw adjusting screw into lever toward
plunger plug if dimension is greater than 5/32” or
away from plunger plug if dimension is less than
5/32”. Check clearance. Repeat procedure until 5/32”
clearance is obtained. Hold adjusting screw in place
with a screwdriver and tighten lock nut. Replace cover
and cover screw.
6.
Adjust pilot for required control temperature. Replace
temperature adjusting knob with pointer in center
position of cover and tighten adjusting knob lock
screw.
For Direct Acting Types – D, DT, DTP, etc.
1.
Loosen temperature adjusting knob lock screw and
remove knob.
2.
Remove cover screw and lift off cover.
3.
Move temperature adjusting screw upward until
bottom of screw is no longer in contact with
diaphragm.
4.
Check “A” dimension with a scale. Distance from
bottom of lever to top of diaphragm plate should be
11/32”.
5.
If dimension is incorrect, remove lever spring screw
and lever spring.
6.
Remove one fulcrum pin retaining washer and push
out fulcrum pin.