drop not in excess of 13.8 kPa 2 pounds per square inch at maximum
flow rate.
c.
Pressure switches shall be factory set, one or two stage as
indicated, with adjustable operating and differential pressure.
Bourdon tube inlet shall be fitted with damper screw adjustment.
d.
Differential pressure switches shall be factory set, provided with
high and low sensing ports, one or two stages and adjustable
differential range and pressure.
e.
Temperature switches shall be factory set, provided with [armored]
capillary tubing and filled sensing system, one or two stages as
indicated, and operating adjustable differential range. For
immersion service, thermal wells shall be provided.
f.
Differential temperature switch shall be factory set, provided
with two separate, [armored] capillary systems, one or two stages,
and adjustable differential range and temperature. For immersion
service, thermal wells shall be provided.
2.6.8
Push-Button Stations
Stations shall be NEMA Class 12 oil-tight, momentary or maintained contact
type, as indicated. Start-push-buttons shall have a fully guarded or flush
black operator button. Stop-push-buttons shall have an unguarded or
extended red operator button.
2.6.9
Selector
Switches shall be NEMA Class 12 oil-tight, momentary or maintained contact
type, as indicated, with standard operator.
2.7
HEAT RECOVERY DEVICES
Water heater shall be double-wall, tube-within-tube heat exchanger type,
complete with thermostatic control. [Heater shall be provided with
[refrigerant compressor head pressure control] [and] [interlocked, potable
water circulating pump].] [Cabinet shall be fabricated of zinc protected
steel and shall be internally insulated in coil space.] Heat exchanger
coil shall consist of an external refrigerant containing carbon steel tube
and an internal, double-wall-in-metallic contact, convoluted, potable water
containing copper tube. [Pump and motor assembly shall be close-coupled,
manufacturer's standard type with indicated head and capacity
characteristics, and with brass, bronze, copper or stainless steel wetted
parts.] Pump shall be [remotely mounted and] rated for [115] [208] [230]
volt a.c. power supply. [Heat exchanger shall be sized to extract not more
than [_____] [25] percent [of the superheated portion] of the total rated
condenser load.]
2.8
MOTORS
Provide continuous duty rated motors conforming to NEMA MG 1. Unless
otherwise specified, motor synchronous speed shall be 1800 rpm.
Refrigeration compressor motors shall comply with compressor manufacturer's
recommendations. Rate motors with nameplate power less than 3/8 kW 1/2 hp
for 115 volts, single-phase, 60 Hz power supply. Rate motors with
nameplate power 3/8 kW 1/2 hp and greater as indicated. Extended voltage
motors nameplated 208-230 and rated for 187-253 volts are not acceptable.
SECTION 15602N
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