connections suitable for connection to the type of control valve supplied,
and manual air vent. Test coils hydrostatically at 2000 kPa 300 psi or
under water at 1700 kPa 250 psi air pressure. Coils shall be suitable for
1400 kPa 200 psi working pressure. Make provisions for coil removal.
2.9.1.4
Drain Pans
Size and locate drain and drip pans to collect all water condensed on and
dripping from any item within the unit enclosure or casing. Condensate
drain pans shall be designed for self-drainage to preclude the buildup of
microbial slime and shall be thermally insulated to prevent condensation
and constructed of not lighter than 0.9 mm 21 gauge type 304 stainless
steel or noncorrosive ABS plastic. Insulation shall have a flame spread
rating not over 25 without evidence of continued progressive combustion, a
smoke developed rating no higher than 50, and shall be of a waterproof type
or coated with a waterproofing material. Design drain pans so as to allow
no standing water and pitch to drain. Provide minimum 19 mm 3/4 inch NPT
or 15 mm 5/8 inch OD drain connection in drain pan. Auxiliary drain pans
to catch drips from control and piping packages, eliminating insulation of
the packages, may be plastic; if metal, the auxiliary pans shall comply
with the requirements specified above. Insulation at control and piping
connections thereto shall extend 25 mm 1 inch minimum over the auxiliary
drain pan.
2.9.1.5
Manually Operated Outside Air Dampers
Manually operated outside air dampers shall be provided according to the
arrangement indicated. Dampers shall be parallel airfoil type and of
galvanized construction. Blades shall rotate on stainless steel or nylon
sleeve bearings.
2.9.1.6
Filters
Filters shall be of the fiberglass disposable type, 25 mm 1 inch thick,
conforming to ASTM F 1040. Filters in each unit shall be removable without
the use of tools.
2.9.1.7
Motors
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NOTE: Edit depending on whether the units are
freestanding, built-in or both. Values for high
static motors cover 115V, 230V, and 277V.
**************************************************************************
Motors shall be of the permanent split-capacitor type with built-in thermal
overload protection, directly connected to unit fans. Motor switch shall
be two or three speeds and off, manually operated, and shall be mounted on
an identified plate [inside the unit below or behind an access door] [or]
[adjacent to the room thermostat] [as indicated]. In lieu of the above fan
speed control, a solid-state variable-speed controller having a minimum
speed reduction of 50 percent may be provided. Motors shall have
permanently-lubricated or oilable sleeve-type or combination ball and
sleeve-type bearings with vibration isolating mountings suitable for
continuous duty. Motor power consumption, shown in watts, at the fan
operating speed selected to meet the specified capacity shall not exceed
the following values:
SECTION 15895
Page 43
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