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CONVERTIBLE CONTROLS CONT.
To convert from Vertical to Horizontal model, remove
Knockout Plug and Plate. Remove Hex Nut (inside con-
trol) and swing capillary upward into back knockout. Place
Knockout Plate beneath Hex Nut on back of control and
tighten Hex Nut (inside control). If bottom knockout is not
used for wiring, insert Knockout Plug.
NOTE
Convertible Control converted to Vertical Model.
KNOCKOUT PLATE
BULB
CAPILLARY
MOUNTING STEM
HEX NUT
KNOCKOUT PLUG
RED
WHITE
BLUE
COMMON
CLOSE ON RISE
OF TEMPERATURE
OPEN ON RISE
OF TEMPERATURE
Refer to the wiring diagram supplied by the boiler or
burner manufacturer, or to the suggested circuits
included with the primary control. The information
below shows the terminals to use for the various
applications.
Limit Control: When used as either a high limit
control or as a low limit control, use the open-on-rise
terminals, (red and blue).
Circulator Control: When used as a circulator control,
use the close-on-rise terminals, (red and white).
Combination Low Limit and Circulator Control: For
this application, all 3 terminals are used. The wiring
diagram on the next page shows a typical circuit for a
hot water system having a boiler with tankless domes-
tic coil.
This control has a single-pole, double-throw, snap-action
switch. The top left-hand terminal (red) is the common
terminal. The top right-hand terminal (blue) has open-on-
rise switch action. The bottom center terminal (white) has
close-on-rise switch action.
All wiring should be done in accordance with local and national electrical codes and ordinances.
WIRING
When used on a combination low limit and circulator
control, it should be located the same as suggested for
low limit service.
To remove the well from the control, loosen set screw in
the large nut, then slide the well off which exposes the
bulb. Screw the well into the proper tapping. Slide the bulb
back into the well, making sure that the bulb enters the
well as far as it will go. Tighten the set screw.
Do not dent or bend the bulb as this will prevent
it from fitting into the well properly.
If the boiler manufacturer recommends a control location,
then follow such recommendations. If none are offered
the following are suggested locations.
For high limit service, the control should be located in
the hottest part of the boiler. This is usually near the top
of the boiler. A high limit control should not be in the same
section of the boiler that contains the heat exchanger that
supplies domestic hot water.
For low limit or operating service, the control should be
so located that it responds to the temperature of that
section of the boiler that heats domestic hot water.
When used as a circulator control, it may be located
near the boiler outlet or riser.
CAUTION
INSTALLATION
Some controls have excess stored capillary which may be
extended for use with an extended shank well. Use reason-
able care when straightening and forming the capillary.
With the capillary fully extended, the bulb should slide all
the way to the end of the well.
EXTENDING CAPILLARY