2.15
REFRIGERANT SIGNS
Refrigerant signs shall be a medium-weight aluminum type with a baked
enamel finish. Signs shall be suitable for indoor or outdoor service.
Signs shall have a white background with red letters not less than 13 mm
0.5 inches in height.
2.15.1
Installation Identification
Each new refrigerating system shall be provided with a refrigerant sign
which indicates the following as a minimum:
a.
Contractor's name
b.
Refrigerant number and amount of refrigerant.
c.
The lubricant identity and amount.
d.
Field test pressure applied.
2.15.2
Controls and Piping Identification
Refrigerant systems containing more than 50 kg 110 lb of refrigerant shall
be provided with refrigerant signs which designate the following as a
minimum:
a. Valves or switches for controlling the refrigerant flow [, the
ventilation system,] and the refrigerant compressor.
b. Pressure limiting device.
2.16
POWER TRANSMISSION COMPONENTS
Fan and open compressor drives shall be in accordance with the
manufacturer's published recommendations, except as otherwise specified.
Horsepower rating of V-belt drive shall be based on maximum pitch diameter
of sheaves. Compressors shall be fitted with fixed sheaves and drives with
a minimum service factor of [1.5] [2.0]. Where the number of unit starts
exceeds 8 per 24 hours, add 0.1 to the required drive service factor.
Sheaves shall be statically and dynamically balanced, machined ferrous
metal, bushing type, secured by key and keyway. Pitch diameter of fixed
pitch sheaves and adjustable sheaves, when adjusted to specific limits,
shall be not less than that recommended by NEMA MG 1. Adjustable sheaves
shall be selected to provide the required operating speed with the sheave
set at mid-point of its adjustment range. The adjustment range for various
size and type belts shall be 16 percent minimum for classical section belts
and 12 percent minimum for narrow section belts. Belt drive motors shall
be provided with slide rail or equivalent adjustable motor bases. Direct
drive couplings for motors rated less than 2.2 kW 3 hp shall be
manufacturer's standard. Direct drive couplings for motors rated greater
than 2.2 kW 3 hp shall be elastomer-in-shear type. Each drive shall be
independent of any other drive. Drive bearings shall be protected with
water slingers or shields. V-belt drives shall be fitted with guards where
exposed to contact by personnel.
2.17
CONDENSER WATER SYSTEMS
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NOTE: Delete this paragraph if inapplicable. Use
UFGS 15645 and 15181 to develop the requirements for
a condenser water system.
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SECTION 15652A
Page 30
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