Leslie Controls Temperature Fixed and Adjustable Proportional band type - Manual (Page 3)

3
Classes and Types
(Letter “P” in Class Indicates
Adjustable Proportional Band Type)
REVERSE ACTING DIRECT ACTING
R-2, RQ-2, RTP-2, RTHP-2 D-2, DQ-2, DTP-2, DTHP-2
INSTALLATION
Typical installations Figures 1 through 5. Follow sketch
applicable to equipment in use. Temperature Pilot may be
installed in any position. See note regarding liquid
operating mediums.
1.
Control valve piping in figures are schematic. Consult
control valve instructions for proper piping details.
2.
Location of Thermal Tube – Locate thermal bulb a
minimum of 6” from nearest heating or cooling coil.
DO NOT place in direct path of heating or cooling
fluids in injection systems. Full length of thermal tube
must be in contact with heated fluid at a point where
true changes in temperature will be felt immediately.
See Figure 5 for shell and tube heaters
(Instantaneous).
3.
Thermometer – Position thermometer in immediate
area of thermal tube indication of signal temperature.
4.
Location of Temperature Pilot – Temperature Pilot
may be installed as far as 50’ from the control valve.
However, in heat exchanger applications control valve
should be close enough to the heater to prevent
existence of an excessive reservoir of heating fluid
between valve and heater which will pass through
heater, after valve closure, causing override.
5.
Liquid Operating Mediums – Elevation between
temperature pilot and control valve should not exceed
10’ when liquid is used as operating medium.
NOTE: New type covers have two directional arrows both
of which indicate “WARMER”. However, the LEFT side of
cover is marked “D-TYPES” and the right side is marked
“R-TYPES”. To INCREASE controlled temperature
setting, turn the knob to the left (counter-clockwise) for
“D-TYPES” and to the right (clockwise) for “R-TYPES).
OPERATION
NOTE: Start initially with all stop valves closed.
1. Open operating medium supply line. Adjust pressure
reducing valve to supply proper operating pressure to
temperature pilot. See Figure 6 for correct values.
Figure 1 - Temperature Pilot Installation Details
Figure 2 - Typical Installation on Storage Heater
Figure 3 - Type RTP Temperature Pilot with Class
GPK Control Valve - Delivered heating or cooling
agent pressure limited by restricting loading pressure
value