Q.
15604-5
AUTOMATIC TEMPERATURE CONTROL (ELECTRIC)
column (w.c.). Control valves shall be sized by the ATC contractor.
Dampers:
1. All control dampers shall be furnished as part of Section 15862.
2. All dampers shall be installed by sheet metal trades.
Damper Operators and Linkages:
1. Damper operators shall be electric open-close or fully proportioning as
indicated or required.
2. Linkages shall be suitable to connect operator to damper leaves and transmit
full torque of motor. All necessary hardware shall be included with the
linkages.
3. Damper motors shall be quiet in operation and shall have ample power to
overcome friction of damper linkage and air pressure acting on louvers to
position dampers accurately and smoothly. The damper operator mounting
arrangement shall be outside the airstream wherever possible.
4. The operators shall be capable of operating at varying rates of speed to
correspond to the dictates of the controllers and variable load
requirements. The operators shall be capable of operating in sequence when
required by the sequence of the operation. The operators shall have external
adjustable stops to limit the stroke in either direction. The operator linkage
arrangement shall be such as to permit normally open or normally closed
positions of the dampers as required.
5. — Electric Operators:
a. On-off, reversing, or proportional as required.
b. Spring return to closed or open position as required.
6. Dampers associated with emergency generator cooling shall fail open on loss
of electrical power.
Miscellaneous Devices:
1. Provide all the necessary relays, positioners, clocks, transformers, etc. to make
a complete and operable system.
2. Locate these devices on local panel unless specified otherwise.
Miscellaneous Hand Switches and Indicator Lights:
1. Size: 30 mm
2. All indicator lights shall be 120V AC, LED with push to test option.
3. Reference Section 16900 for additional specifications.
4. Number of positions and nameplate legends shall be as indicated in Paragraph
3.1 of this specification.
Relays:
1. Pilot duty relays shall be Form C, UL listed, two (2) to four (4) pole relay with
DIN rail mounted base rated a minimum of 5 amps at 120 VAC. Relay shall
have indicator and mechanical test pushbutton.
2. Industrial relays or contactors shall be used to directly drive 120 VAC single
phase equipment.
3. Refer to Section 16900 for additional requirements.
Panels:
1. Panels shall be provided to enclose all relays, switches, and controllers as
required.
13089K
