Honeywell 7351F Application Selection And Cross-Reference Manual page 11

iPRO Applications
™
Remote Sensing
Can be configured using Honeywell's line of 10K ohm and
20K ohm commercial sensors, supporting the following
applications that residential thermostats don't:
• Temperature Averaging Networks
Because commercial thermostats can be configured
to a 20K ohm network, temperature average networks
of anywhere from 1 to 9+ sensors can be deployed.
Combinations of 10K ohm and 20K ohm sensors are
use to create the averaging network. The most popular
sensors are the TR21 and TR21-A (averaging) 10K sensor
and the TR21 and TR21-A 20K sensor.
tr21
tr21
tHe tr21-a is a 10K oHm sensor
• Room Temperature Control
Performed via a sensing network using the following
sensors:
– W all Sensors: TR21-A (10K) for averaging only,
TR21 (20K), C7189U1005 (10K)
– Flush Mount Sensors: C7772A1012 (20K)
– Button Sensors: C7041P (20K)
• Duct Return Temperature Control
Performed using the following 20K sensors:
C7041B/C7041C/C7770A/C7041J
sUBBase
tr21-a
Unit Vent
• Can be programmed to control ASHRAE Cycle 1 unit vent
applications.
• Unit vent outside-air damper can be programmed through
the Economizer feature. When the unit vent is on and
occupied, the thermostat will enable the economizer
relay to keep the outside air damper at the maximum
percentage opening. Only maximum percentage
opening is available; the thermostat will not modulate
the damper. When the unit vent is unoccupied, the
thermostat will close the damper.
• Range Stop feature can be configured to program a low
limit setpoint to prevent equipment damage from freezing.
Commercial Codes
• Comply with commercial building codes and meet the most
rigorous standard, California's Title 24.
• No hold button is available, so the thermostat remains
in permanent schedule.
• Override button allows the tenant to override an
unoccupied mode for up to 4 hours and can be configured
for an exact override setpoint. Depending on the partial
lockout level deployed, a user may override to an exact
setpoint or be given a setpoint range to choose from.
• Pre-Occupancy Purge and Economizer functions allow
the building owner to meet all HVAC ventilation codes for
commercial buildings.
Lighting Load Reduction (TOD)
• Commercial buildings are frequently automated to turn off
lighting loads. Lighting loads can use even more energy
than HVAC systems in commercial buildings, and 79%
of commercial buildings have off-hours lighting load
reduction control. By using the time-of-day relay (TOD)
in conjunction with a lighting control system, users can
automate their lighting loads. (Not available on MultiPRO )
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