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NOTE:
1. Use a recessed aspirating type mounting in
public areas where it is necessary to make the
thermostat less obvious to minimize vandalism. Do
not use aspirating or concealed mountings in family
housing. Use adjustable thermostats in family
housing.
2. Locate room thermostats on interior walls where
they will respond to average conditions in the
rooms. Thermostats shall not be mounted on exterior
walls if other locations are available. If mounted
on exterior walls, thermostats shall be indicated
with an insulating subbase. Thermostats for comfort
cooling that are occupant controlled (indicate the
limits) shall have fixed factory temperature limits.
Indicate centerline of room thermostat at 1.50
meters 5 feet above finished floor.
3. Indicate switch differential for each contact
and between each contact on multistage switches;
also, indicate whether the differential is
adjustable or fixed.
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2.8.1
Ranges
Thermostat ranges shall be selected so that the setpoint is adjustable
[without tools] between plus or minus 5 degrees C plus or minus 10 degrees F
of the setpoint indicated.
2.8.2
Nonmodulating Electric Room Thermostats
Contacts shall be single-pole double-throw (SPDT), hermetically sealed, and
wired to identified terminals. Maximum differential shall be one degree C
2 degrees F. Thermostat covers shall consist of locking metal or
heavy-duty plastic, and shall be capable of being locked by an Allen wrench
or special tool. Thermostats shall have manual switches as required by the
application and a minimum range of 13 to 32 degrees C 55 to 90 degrees F.
2.8.3
Microprocessor-Based Room Thermostats
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NOTE: Use thermostats only for small split systems
and packaged single-zone units.
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Microprocessor-based room thermostats shall have built-in keypads for
scheduling of day and night temperature settings. [Access to the
scheduling mode shall be by password control code.] When out of the
scheduling mode, thermostats shall have continuous 12-hour time display,
with AM and PM indication, continuous display of day of the week, and
either continuous display of room temperature with display of temperature
setpoint on demand, or continuous display of temperature setpoint with
display of room temperature on demand. In the programmable mode, use the
display for setting and interrogating time program ON-OFF setpoints for
SECTION 15901N
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