H23.REV

COMMERCIAL REFRIGERATION

NOTE: FINAL COPY: JANUARY, 1987.

NOTE: THIS SECTION FOR WALK-IN REFRIGERATOR SYSTEMS WITH 7-1/2 HP OR SMALLER CONDENSING UNITS. COORDINATE WITH TRADE CHIEF AND PROJECT MANAGER

Part 1 -	GENERAL

1)	WORK INCLUDED

A.	Work in this Section includes the providing of labor, materials, equipment and services necessary for a complete and safe installation in accordance with the contract documents and all applicable codes and authorities having jurisdiction for refrigeration systems for each walk-in refrigeration with the following

UNIT

1.	Water-cooled condensing unit.

2.	Air-cooled condensing unit.

UNIT

3.	Unit cooler.

4.	Liquid suction interchanger.

5.	Automatic defrost system, where noted.

6.	Piping.

7.	Emergency switch.

8.	Testing and charging.

2)	RELATED WORK AND REQUIREMENTS

A.	Requirements of GENERAL CONDITIONS, DIVISION NO. 1 and Section GENERAL PROVISIONS FOR HEATING, VENTILATING, AND AIR CONDITIONING WORK apply to all work in this Section

NOTE: EDIT TO SUIT PROJECT REQUIREMENTS. INCLUDE ONLY SECTIONS DIRECTLY AFFECTING WORK OF THIS SECTION

B.	Related work in the following Sections:

1.	PIPING.

2.	MOTORS.

3.	MOTOR CONTROLLERS.

4.	AUTOMATIC CONTROL SYSTEMS.

5.	INSULATION.

6.	-----.

3)	REFERENCE STANDARDS

A.	Published Specifications' standards, tests or recommended methods of trade, industry or governmental organizations apply to work in this Section

B.	Comply with all applicable national, state and local codes and refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING, AND AIR CONDITIONING WORK for additional Reference Standards

4)	QUALITY ASSURANCE

A.	Refer to Section GENERAL PROVISIONS FOR HEATING, VENTILATING, AND AIR CONDITIONING WORK for Guarantee and other Quality Assurance requirements

5)	SUBMITTALS

A.	Submit shop drawings for unit coolers, condensing units and automatic defrost equipment, including catalog cuts, dimensioned layout drawings and wiring diagrams

Part 2 -	PRODUCTS

1)	BASE BID MANUFACTURERS

A.	Condensing units: Carrier Air Conditioning Co., Copeland Refrigeration Corp., Dunham-Bush Inc., Kramer Trenton Co., Tecumsen Products and York Corp

B.	Unit coolers: Dunham-Bush,Inc. and Kramer Trenton Co.

C.	Automatic defrost equipments: Dunham-Bush Inc. and Kramer Trenton Co

2)	PIPING AND FITTINGS

A.	Piping: Refer to Section "PIPING" for refrigerant, refrigerant relief and condensate drain piping. Provide soldered wrought copper fittings for all services

3)	REFRIGERATION EMERGENCY SWITCH

A.	Break glass type, similar to Acme Fire Alarm Co., 390 Series

4)	CONDENSING UNITS

A.	Factory assembled and prewired units.

COND

B.	Water cooled condenser, cleanable tube type, mounted on common steel base with compressor and water regulating valve

C.	Air cooled condenser, fan and coil type, mounted on common steel base with compressor

COND

D.	Compressor: Serviceable semi-hermetic, reciprocating type, suction gas cooled and suitable for use with refrigerants as follows

NOTE: COORDINATE REFRIGERANT WITH MANUFACTURER.

1.	Suction temperature:

a.	30 deg F and above: R-22.

b.	-10 deg F to 30 deg F: R-12.

c.	Below -10 deg F: R-502

NOTE: COORDINATE WITH ELECTRICAL DEPARTMENT.

d.	Provide motor controller.

E.	High-low pressure switch, inherent motor heat thermostat, service valves, refrigerant relief valves, receiver, suction gas filter, oil sight glass and crankcase heater

F.	Compressor motors shall be high starting torque type.

NOTE: FOR WATER COOLED UNITS ONLY.

G.	Condensing units 7-1/2 hp and larger: With positive displacement oil pump and oil failure switch. Condensing units similar to Dunham-Bush

5)	UNIT COOLERS

A.	Except for meat storage and food preparation rooms, unit coolers shall be direct expansion type, tested at 300 psig, with aluminum plate fins and copper tubes. Cabinet shall be aluminum with enamel finish with drain connection. Fan shall be direct-connected, motor driven propeller type

1.	Unit similar to Dunham-Bush.

B.	For meat storage and food preparation rooms, cooler shall be gravity type similar to Dunham-Bush Low Velocity Unit Cooler Type ND

6)	AUTOMATIC DEFROSTING

A.	Electric type: With electric heating cables in unit cooler finned coil

DUN

1.	Similar to Dunham-Bush EC.

2.	Similar to Dunham-Bush ECLS.

DUN

B.	Control cabinet complete with defrost control timer, time initiated, coil temperature cutout, defrost and fan contactors as required

C.	Unit cooler drain pipe: Defrost system shall extend entire length within cold box and through cold box wall. Insulate piping outside of cold box. Refer to Section "INSULATION"

7)	REFRIGERATION ACCESSORIES

A.	Refrigeration circuits with the following:

1.	Combination filter and dryer in liquid line, with two (2) replaceable cartridges, similar to Sporlan Catchall, replaceable core type

2.	Combination sight-glass and moisture indicator, similar to Sporlan See-All

3.	Liquid line solenoid valve.

Part 3 -	EXECUTION

NOTE: ON DRAWINGS SHOW ELEVATION, INCLUDING SUPPORTS, VIBRATION ELIMINATORS AND OTHER INFORMATION REQUIRED FOR COMPLETE AND PROPER INSTALLATION

1)	INSTALLATION

A.	Unit cooler condensate drainage shall be piped to floor drain

B.	Refrigerant piping shall be sized and installed in accordance with ASHRAE recommendations and arranged to insure proper oil flow in system

C.	Refrigerant relief shall be piped to atmosphere in accordance with code requirements

2)	FIELD QUALITY CONTROL

A.	Testing and charging:

1.	Test before charging as follows:

a.	Pressurize system to 300 psig with nitrogen and refrigerant mixture

b.	Test points of possible leakage with halide testing device

c.	Evacuate system to 100 microns using high vacuum pump

d.	With vacuum pump stopped, maintain vacuum for 24 hours without losing more than 50 microns

e.	Vacuum measurements shall be made using a micron gauge

2.	After system is tested pressure tight, charge with refrigerant

3.	Provide complete charge of lubricating oil.

4.	Certify that units have passed above test before turning over to Owner

B.	System operating pressure shall be in accordance with ASME Code for operating refrigerant pressures

C.	Test refrigerant piping in accordance with regulations of all authorities having jurisdiction