NOTE: Delete last sentence when not necessary.
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Circuit controls shall include the following: Program timer, 30-minute
percentage timer, thermostat, control circuit transformer, and all
necessary relays and pressure switches to carry out the sequence of
operation as specified hereinbefore. Program timer shall be 7-day type,
electric motor driven, with each hour of the day shown. Time intervals
shall be adjustable with a minimum switching interval of 4 hours.
Percentage timer shall be 30-minute type. Thermostat shall have a range of
zero to 38 degrees C and a differential of 1 degree C 100 degrees F and a
differential of 7 degrees F; thermostat shall be provided with not less than
1.82 m 6 feet of capillary tubing. Control circuit voltage shall be 120
volts, single phase, 60 hertz. [A transformer shall be provided to step
down incoming service voltage to 120 volts.]
2.13.8
Alarm
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NOTE: Delete requirements for alarm circuit
auxiliary contacts where transmission of alarm to
remote 24-hour manned station is impractical or not
desired. Transmission is preferred where necessary
to expedite investigation of alarm condition. Insert
identity of remote location. Provision should be
made in the appropriate section of the project
specification to extend alarm circuit wiring from
auxiliary contacts to the remote location.
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Horn type or 150 mm 6 inch bell alarm, battery and necessary circuits shall
be provided to sound alarm: (a) when standby blower(s) has replaced lead
blower; (b) when power to plant has been interrupted. [Alarm circuit
shall include auxiliary contacts for transmission of signal indicative of
either alarm condition to [_____].]
2.13.9
Electrical Wiring
All control circuits shall be wired with 1.8 mm No. 14 gage stranded, 1 mm
2/64 inch insulation machine-tool wire with ring tongue compression type
lugs and number tags on both ends of all wires. Circuit breakers and power
circuits shall be wired with necessary gage wire, minimum size 2.5 mm No.
12 gage, with wire lugs and number tags. All wires shall be secured in a
neat workmanlike manner with plastic tie-raps and/or wiring duct. All
wires going to components mounted on the enclosure door shall be secured in
a cable-like bundle and strapped to the door and the enclosure with
sufficient slack to allow easy operation of the door. All circuits
requiring field connection shall be terminated on panel terminals.
2.14
APPURTENANCES AND ACCESSORIES
2.14.1
Walkways, Platforms, and Bridges
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NOTE: Delete references and requirements for raised
platform floor plate or for grating as necessary.
Grating is recommended where snow or ice
accumulation may be anticipated; otherwise, use
floor plate.
SECTION 11375N
Page 75
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