[pneumatic] [4-20 mA dc], proportional to the temperature differential
sensed. Provisions for local and remote set point adjustments shall be
included. Range shall be as required to meet system requirements. For
immersion service, thermal wells shall be provided.
2.6.5
Pilot Lights
Panel mounted pilot lights shall be NEMA Class 12 oil-tight, push-to-test
transformer type for 6-8 Vac lamps. Lamps shall be replaceable by removal
of color cap. Caps color shall be as indicated.
2.6.6
Programmer, Demand Control/Load
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NOTE: Before application of energy management
systems/load shedders to refrigeration systems, and
related fans and pumps, the designer shall ascertain
that application will not be conducive to equipment
damage and counterproductive. Safety trips,
compressor slugging, freeze-ups and reloading of
circuits may occur.
**************************************************************************
Programmer shall be fully automatic, fail safe, field programmable,
solid-state, demand control and load programming for [_____] [16] loads.
Demand control portion shall monitor power consumption by [watt] [or]
[current] transducers. Set point shall be field adjustable with adjustable
dead band. Load shedding sequence time and differential time between load
shedding shall be adjustable. Contacts shall store alarm condition. Meter
readout shall indicate demand deviation from set point. Load profile
recorder shall be strip chart type with readily discernable event record.
Load programmer shall permit programming of on/off time of each load for
any time element within a week and shall equalize power demand over a
preset time cycle. System shall include input override and time cycle
accelerator for checkout. Alarm condition, status of loads and time period
shall be visually indicated and recorded. Each load shall include a H-O-A
toggle switch. Alarm provisions shall include relay contacts for external,
remote alarm functions and test provisions. Override [thermostat]
[pressure switch] [timer] shall be provided to restore shedded loads
indicated. Control panel enclosure shall be NEMA ICS 6, Type 1, surface
mounted type with key lock. Load profile recorder shall be [surface]
[flush panel] mounted type. Load relays shall be plug-in type with
critical load failure in "on" mode and contacts rated for pilot duty at 120
volt a.c. Load shedding position switches shall shed loads on a first
shed/last restore basis and remove loads from system logic for shedding
cycle. Time clock shall be fitted with spring motor to maintain time in
event of power failure.
2.6.7
Switches, Fluid Service
Switches shall be field adjustable SPDT type and shall have NEMA ICS 6,
Type 1 enclosure with operating range specified or indicated. Circuits
shall be as required for the applicable functions.
a.
Provide air flow switches with a service pressure range of 30 to
2940 Pa 0.12 to 10 inches water gage.
b.
Provide water flow switches with a body rating suitable for the
service, field adjustable activating flow rate, and a pressure
SECTION 15602N
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