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INSTALLATION
NOTE
Use care not to bend or dent either of the sensing bulbs
Both the outdoor bulb and inside bulb should be installed
before the control case, since capillary lengths of these bulbs will
normally determine the final location for the control case.
A. INSTALLING THE OUTDOOR BULB:
Locate the outdoor bulb so that it senses actual outdoor air
temperature. Attach mounting bracket supplied with control to
some convenient outside part of the building so that the outdoor
bulb is:
1. Exposed to circulation of air and wind.
2. Shielded from rain, snow, and direct rays of sun.
3. Not close to false sources of heat such as dryer vents,
exhaust fans, melting snow or ice, etc.
4. Sufficiently above ground to prevent tampering or being
covered with snow, ice, or debris.
B. INSTALLING THE WATER BULB:
The water bulb should be installed in a hot section of the boiler.
It should never be installed near a return inlet to the boiler.
C. INSTALLING THE CONTROL CASE:
The case of the Indoor-Outdoor Control should be installed as
follows:
1. Install it on a vertical surface such as a wall or the side of a
joist.
2. Do not install it on a heated surface such as on the boiler or
a hot water pipe.
3. Install it high enough so that it will be convenient to make
adjustments on round dial and large screw at bottom of case.
4. Install it so end of case with electrical outlet is on top.
MOUNTING
BRACKET
OUTDOOR BULB
CEILING
ROOF
The underside of the eaves or
overhang of a NORTH or
NORTHWEST roof is normally
a good location. It should be
exposed to the circulation of air
and wind.
INSTALLED
HIGH ON WALL
INSTALLED
ON JOIST
WIRING & OPERATION
All wiring should be done in accordance with local and national electrical codes and ordinances.
This indoor-outdoor control is designed to vary boiler
temperature according to outdoor weather conditions.
For this reason, it is recommended that this control only
be used on systems where the domestic hot water supply
is heated by a separate source from the heating boiler.
The most common method for using an indoor-outdoor
control is shown in the block diagram below, and in the
wiring diagrams which follow. A separate high limit control
should always be used with an indoor-outdoor control.
HOT WATER BOILER
INDOOR
OUTDOOR
CONTROL
HIGH LIMIT
CONTROL
BURNER
CIRCULATOR
RELAY
ROOM
THERMOSTAT