Guide specifications (cont)
2)One-in. pleated, (2) 1-in. throwaway or 2-in pleated MERV 11 filters with 2-in. pre-filter shall be installed as indicated on the equipment schedule.
c.Insulation:
1)Units shall be equipped with 1-in. thick Tuf-Skin™ II insulation (standard).
2)Units are available with ¾-in. closed cell, 1-in. Tuf-Skin Rx™ edge sealed, or 1-in. foil-faced insulation.
d.Controls:
1)Unit shall be equipped with 24-v trans- former, motor contactor and terminal strip for connection to field or factory provided controller.
2)Unit shall be equipped with interlock- ing door-disconnect switch, touch-type fusing, 24-v transformer, motor con- tactor and terminal strip for connec- tion to field provided controller.
3)Unit shall be equipped with interlock- ing door-disconnect switch, separate motor and electric heater touch-type fusing, 24-v transformer, motor con- tactor and terminal strip for connec- tion to field-provided or factory- provided controller.
e.Motor(s):
Single-phase motors are capacitor start and shall include automatic reset thermal over- load protection and shall be available in 115, 208, 230, or 277 volts (60 Hz). Three-phase motors shall be available in 208, 230, or 460 volts (60 Hz).
f.Electric Heat:
1)Electric heaters shall be constructed of high-grade resistance wire supported by ceramic insulators on plated steel brackets. The heat elements shall be suspended in front of the outlet, after the blower and coil. High-limit thermal cutouts shall protect the heat elements in the event of an air failure.
2)Single-phase heaters shall be available in 115, 208, 230, or 277 volts (60 Hz). Three-phase electric heat shall be available in 208, 230, or 460 volts (60 Hz).
2.Field-Installed Accessories:
a.Mixing Boxes:
2)Mixing boxes shall include
a linkage kit, which consists of two crank arms, 2 swivels and a rod, 25 in. long (for unit sizes 06-16) or 84 in. long (for unit sizes 20-40), for the field installation of the actuator.
b.Thermostats:
Three thermostats shall be available for field installation:
1)The single stage heat thermostat shall feature manual changeover, off-cool- heat system switch, on-auto fan mode switch, single-stage electric heat, and outside air signal.
2)The 2-stage heat thermostat shall fea- ture automatic/manual changeover, digital display of temperatures and all functions, off-cool-heat-auto system mode buttons, single speed fan opera- tion, on-auto fan mode button, single or two stage electric heat signal, out- side air signal and optional remote temperature sensor.
3)The single-stage heat, 2-pipe heat/ cool thermostat shall feature digital display of ambient temperature and operating mode, single fan speed oper- ation, power and operating mode but- tons, continuous fan operation, cycling water control valve, 4-pipe automatic changeover/manual changeover with “on-auto” fan mode button, optional one or 2-stage electric heat signal, and purge cycle, temperature sensor for 2-pipe cold water/hot water systems, and programmable operating range, dead band, digital display, tempera- ture set-back.
c.Valve Packages:
1)Valve packages shall be factory- assembled for field installation.
2)Basic valve packages shall include 2-way or 3-way valves with balancing valves and 2 ball valves.
3)Deluxe valve packages shall include a circuit setting and a strainer in addition to the features included in the basic valve package.
