3.1.17
Thermometers
Thermometers shall be fitted with thermal well. Mercury shall not be used
in thermometers. Where test thermometer locations are indicated, only
plugged thermal well shall be provided. Thermometers located within 1525
mm 5 feet of floor may be rigid stem type. Where thermal well is located
above 1525 mm 5 feetabove floor, thermometer shall be universal adjustable
angle type or remote element type to 2135 mm 7 feet above floor and remote
element type where thermal well is 2135 mm 7 feet or more above floor.
Thermometers shall be located in coolant supply and return or waste lines
at each heat exchanger, at each automatic temperature control device
without an integral thermometer, refrigerant liquid line leaving receiver,
refrigerant suction line at each unit cooler, and where indicated or
required for proper operation of equipment.
3.1.18
Flexible Connectors
Flexible metallic connectors shall be installed perpendicular to line of
motion being isolated. Piping for equipment with bidirectional motion
shall be fitted with two flexible connectors, in perpendicular planes.
Reinforced elastomer flexible connectors shall be installed in accordance
with manufacturer's instructions. Piping guides and restraints related to
flexible connectors shall be provided as required. Connectors shall be
provided in the suction and discharge lines on spring mounted compressors.
Connectors shall be anchored firmly at the upstream end on the suction line
and the downstream end in the discharge line.
3.1.19
Power Transmission Components Adjustment
V-belts and sheaves shall be properly aligned and tensioned preliminary to
operation and after 72 hours of operation at final speed. Belts on drive
side shall be uniformly loaded, not bouncing. Alignment of direct-drive
couplings shall be to within 50 percent of manufacturer's maximum allowable
range of misalignment.
3.1.20
Unit Cooler Drainage
Drain lines from product storage spaces maintained at 2 degrees C 35
degrees F or lower shall be fitted with NSF approved connections and
cleanout tee; shall be short as possible; shall not be trapped; and shall
not be combined, unless all combined units are defrosted simultaneously and
are controlled by a single timer. Drain lines may be combined in spaces
maintained at nonfreezing temperatures after individual trapping. Drain
lines shall be heat traced and insulated starting with drain pan fitting
through the surface penetration into a nonfreezing space, a distance
sufficient to ensure freedom from ice during defrost cycle. Drain line
size shall be not less than drain pan outlet size. Drain line shall be
pitched as shown, and not less than 6 mm/300 mm 1/4 inch/foot where not
shown. Drain line heat tracing shall be [electric] [and] [hot gas] as
indicated. [Hot gas supply line to the unit cooler shall be routed in
contact with the drain line by banding with all stainless steel worm drive
hose clamps on not more than 300 mm 12 inch centers and heat transfer area
shall be increased by continuous tangential fillets of heat conducting
paste.] [Electrically heat traced drain lines shall utilize external or
internal to drain line heating elements, applied to produce watt-density
and temperature recommended by the manufacturer. Where metallic sheathed
heat tracer is used in contact with metallic drain line or internal
thereto, sheath material shall be stainless steel. External metallic
sheathing shall be installed by banding on not more than 300 mm 12 inch
SECTION 15652A
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