15604-4
AUTOMATIC TEMPERATURE CONTROL (ELECTRIC)
2. Controllers shall be designed and constructed for equipment room use and shall
not be affected by ambient temperature and humidity.
3. | Duct mounted or immersion type shall have spans of one hundred degrees or
two hundred degrees Fahrenheit as required. Averaging element sensors shall
have a minimum nine-foot capillary element. Temperature sensors shall be of
rigid stem using bimetallic sensing elements except where averaging is
required.
4. — Sensors shall be of corrosion resistant construction, tamper proof, suitable for
mounting on a vibrating surface. If capillary, shall be temperature compensated
and armored or installed in protective tubing.
5. All sensing elements for water pipe mounting shall be furnished complete with
separable protecting wells filled with heat conductive compound. Sensors shall
be factory calibrated and tamper proof. If easily adjustable sensors are
provided, they shall be located inside metal enclosures with cylinder lock and
key to prevent unauthorized setting.
Low Temperature Safety Thermostat:
1. Electric: Low temperature safety thermostats shall have 20 ft. low point
sensitive elements (not averaging type) installed to cover the entire duct
area. These thermostats shall be two position manual reset type. Devices used
on integral coil face and bypass units shall have remote thermostat, and have
bulb in accordance with manufacturer's requirements.
High Temperature Safety Thermostat:
1. Electric: High temperature safety thermostat shall be duct mounted manual
reset type with adjustable setpoint. (75-165 degrees F).
Smoke Detectors:
1. Electric: Smoke detectors shall be of the duct-mounted, photo-electric
type. The units shall be of 120 volts with contacts or additional relays suitable
for the required safety shutdown sequence. The units shall have local alarm
indication, be of the manual reset type have an extra set of normally open and
normally closed contacts for use by the building fire detection system and be
compatible with the building fire detection system.
Thermometers:
1. A thermometer shall be located adjacent to each rigid stem thermostat. A dual
thermometer with liquid-filled remote system shall be mounted adjacent to each
remote bulb thermostat. Averaging bulb thermometers shall be used where
averaging bulb thermostats are required.
2. Provide duct-type thermometers in all fresh air intake, mixed air, return air, and
all supply fan discharges and elsewhere where noted or shown. Thermometers
shall have the proper range scales for the locations where installed.
3. Panel-mounted indicating thermometers shall be minimum two inches’
diameter.
Differential Pressure Controllers:
1. Static pressure regulators shall be direct or reverse acting as required with
adjustable setpoint and throttling range with field calibration capability.
Control Valves: Three-way, two-way, mixing, or diverting service as
required. Operator shall be electric. Valve pressure drop shall not exceed 7 feet water
13089K
