APC UCCS Temperature Control - Manual (Page 24)

JANUARY 2008 UCCS STANDARDS 15950-24
2. Line-voltage thermostats shall be UL-listed, SPDT, SPST, or DPST with contact rat-
ing suitable for application, maximum 2F differential.
3. Low-voltage thermostats shall be single or multi-stage heating and/or cooling type as
required by application.
a. Combination heating/cooling thermostats shall have independent adjustments for
heating and cooling setpoints and shall not allow setpoint cross-over.
b. Provide individual heat or cooling anticipator for each control stage. Anticipator
shall be matched to connected load, or shall be adjustable.
c. Microprocessor-based programmable type thermostats, when used, shall not lose
time or program on power failures of 12 hours or less.
4. Provide locking enclosures/guards for all thermostats located in public areas such as
lobbies, corridors, gyms, cafeterias, classrooms, auditoriums, pools, theaters, stores,
warehouses, garages, etc.
B. Room Humidistat:
1. All wall-mounted room humidistats shall have locking covers with concealed setpoint
adjustment, minimum range 30-60% RH. Omit humidity indicator when possible.
2. Provide metal guards with security screws for all humidstats located in public areas
such as lobbies, corridors, gyms, cafeterias, classrooms, auditoriums, pools, theaters,
stores, warehouses, garages, etc.
C. Duct, Immersion, and Outdoor Thermostats:
1. Provide single or multistage type with contact arrangement and rating suitable for
application. Line voltage units shall be UL-listed.
2. Sensing element shall be liquid-filled, remote-bulb type or bi-metal type as required.
a. Remote bulb type shall have sufficient capillary lengths to allow mounting of
thermostat at convenient location for adjustment.
b. Provide separable wells for immersion applications.
c. Provide sun shields for outdoor sensing bulbs.
d. Provide ambient temperature compensation where thermostat body is subjected
to outdoor ambient temperature variations.
3. Individual stage differential -2F maximum (fixed). Provide adjustable differential
type when thermostat is used for capacity control of DX refrigeration or to cycle fans.
D. Duct Humidistats:
1. Shall be line or low-voltage type utilizing non-organic sensing element. Contact