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JANUARY 2008 UCCS STANDARDS 15950-22
provide smooth, reliable actuation at all times. Modulating valves shall be complete with
positioners by the same manufacturer. Where indicated, position switches by the same
manufacturer shall be provided.
2.08 AUXILIARY DEVICES - PNEUMATIC
A. Room Thermostats:
1. All room thermostats shall be high-capacity, relay type, with pneumatic feed-back,
adjustable sensitivity (1 to 4 psi°F minimum), and an output test port. Provide
indicating set point, locking covers (Allen-head screws, or other means), as noted on
drawings.
2. Provide single temperature thermostats for heating-only or cooling-only applications,
direct-or reverse-acting with range as required.
3. Deadband thermostats are not acceptable. For heating/cooling applications, utilize
non-overlapping spring ranges on the heating/cooling devices to achieve a deadband.
4. Provide recessed, aspirating thermostats or conventional thermostats with locking
enclosures/gaurds for all thermostats located in public areas, such as lobbies,
corridors, auditoriums, gyms, pools, theaters, stores, warehouses, garages,
classrooms, etc.
B. Pressure-Electric (PE) Switches:
1. Provide one or two-stage switch action SPDT, DPST, or DPDT, as required by
application. Electrically rated for pilot duty service (125 VA minimum), and/or for
motor control.
2. Shall be open type (panel-mounted) or enclosed type for remote installation.
Enclosed type shall be NEMA 1, unless otherwise specified.
3. Furnish permanent indicating gauge on each pneumatic signal line to PE switches.
C. Electro-Pneumatic (EP) Solenoid Air Valves:
1. Shall be snap-acting, three-way air valve with three ports (common, N.O. and N.C.),
UL-listed.
2. Provide diecast or plastic body with stainless steel trim. Minimum safe pressure shall
be 30 psig at 130F ambient and 130F control air temperatures.
3. Coil voltage as required up to 120VAC
4. Provide open type (panel-mounted) or enclosed type for remote installation.
Enclosed in type NEMA 1 unless otherwise specified.
D. Current-Pneumatic (I/P) and Pneumatic-Current (P/I) Transducers:
1. Shall accept industry standard inputs and provide standardized outputs.