Install Instructions

LOCKPLATE AND KNOB
The lockplate can be used to lock:
1. Both Range and Differential Screws. Neither setting can be
adjusted. To use lockplate options 2 or 3, break one end off
the lockplate along the creaseline (see exploded view
diagram below).
2. Range Screw Only. Range screw is locked so that high event
is fixed – adjusting the differential screw allows low event only
to be changed.
3. Differential Screw Only. Differential is locked so that
differential is fixed – adjusting range screw moves both high
and low event up or down together.
NOTE: If only one screw is
locked, knob can be applied to
unlocked screw.
NOTE: The Range Screw(s) and
Lockplate attachment screw are
cross-drilled to allow the use of a
wire seal.
Procedures
1) Adjust the Range Screw/Pointer to the desired "High Event"
setting.
2) Adjust the Differential screw to the desired differential.
Low Event = High Event – Differential
3) Adjustment of the Range Screw changes both high and
low events.
4) Adjustment of the Differential Screw changes the "Low Event"
only.
SETTINGS & ADJUSTMENTS
Adjustable Range & Differential Controls
Do not set the Low Event below the lowest allowable event.
Low Event = High Event – Differential
Lowest Allowable Events
Range Lowest Event
-20 to +60°F -40°F
-20 to +95°F -30°F
Before leaving a new control installation, it is best to observe a
minimum of 3 cycles to assure proper operation.
MOUNTING DIMENSIONS
Room Sensing – Air Coil Controls
Room Sensing Air Coil Controls and other vapor charged controls
when specified utilize a 82 K ohm bellows/control body heater to
reduce cross ambient temperature effects, and improve control
sensitivity. An insulating mounting bracket is also provided with
air coil controls to reduce the "heat sink" effect of the mounting
surface.
Heater Wiring for
thermostats with
bellows heater.
KNOB
KNOB
SCREW
FULL LOCKPLATE
LOCKS BOTH
RANGE &
DIFFERENTIAL
TO COMPRESSOR
OR COOLING MEANS
TO
HEATING
MEANS
Single Temperature SPDT
Switch Response
Refrigeration/Air Conditioning/
Ventilation Applications
Heating
Applications
SINGLE TEMPERATURE CONTROL SWITCH CONNECTIONS