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244 ASHRAE Guide And Data Book HI HHRS WORLD'S FINEST GAS-FIRED EQUIPMENT Laars LCR: Heavy-duty copper-tube heating boiler The Laars LCR offers performance without compromise-the first boiler designed specifi cally and totally for gas-fired generation of hot water. The result is a smaller, more rugged unit with weight savings up to 50%. Proved in continuous, heavy duty applications for over ten years. FINNED COPPER TUBES The most efficient heat exchanger available, with 9.7 times the heat trans fer surface of plain tubes. Single row design pre vents sludge buildup. COMPACT FIREBOX Efficient design, using thinwall lifetime ceramic refractory, reduces firebox size and results in clean, complete combustion (flue prod ucts guaranteed less than .04% carbon monoxide). Eliminates warm-up allowance or need to store large amounts of water in the boiler. HEAVY DUTY CONSTRUCTION All-galvanized steel jacket with porcelain-enameled cast iron headers, corrosion-resistant fittings, baked enamel finish. Components float' inside housing without creating internal stresses. 40 SIZES AVAILABLE From 154,000 to 7,000,000 BTU input with standard on-off controls or Dual FioMonitor control system. Complete range of ignition safeguard systems available. Look to Laars for lifetime durability in water heating equipment AFJ MARK II SWIMMING POOL HEATERS Sizes to 7,000,000 BTU for all commercial and quality residen tial installations. Lifetime warranty on firebox, burners and other key parts. Proven scale-free and corrosionfree under severe water conditions. LAARS LC VOLUME WATER HEATERS Sizes to 7,000,000 BTU with recovery rates from 126 gal. to 6048 gal. per hour (100* rise). Rugged, lifetime construction with scale-free, water flow. Designed for use with storage tank and circulating pump. STRATA-TEMP SUPPLY SYSTEMS Volume hot water for hotels, restau rants, etc. LC heater plus exclusive Strata-Temp storage tank delivers 80% of stored water at design temper ature. Single and two-temperature sys tems available for every need. Com pact design with simplified installation. Laars products conform to ASME Boiler Code for 125 pst working .pressure, and are AGA-epproved as gas4ired boilers. LAARS ENGINEERS, INC. / 13246 SAT1COY STREET. NORTH HOLLYWOOD, CALIFORNIA (213) 875-0201 Office*: Dallas, Detroit, Miarrd, Phoenix, San Francisco / Warehouses: Atlanta, Dallas, Detroit, Miami Catalog Data Section 245 ALCO VALVE CO. Box 398, Creve Coear Br., St. Louis, Mo. 63141, U.S.A. THERMOSTATIC EXPANSION VALVES . . . CONSTANT PRES SURE (AUTOMATIC) EXPANSION VALVES . . . REFRIGERANT DISTRIBUTORS ... SOLENOID VALVES ... SUCTION LINE REG ULATORS ... FLOODED EVAPORATOR CONTROLS... REVERS ING VALVES ... LIQUID AND SUCTION LINE STRAINERS... RE FRIGERANT FILTER-DRIERS... HOT GAS BY-PASS CONTROLS. SEE YOUR ALCO WHOLESALER For capacities in excess of those listed, write ns and give specific requirements THE COMPLETE LINE OF REFRIGERANT CONTROLS ii THERMO EXPANSION VALVES--For automatic control of liquid refrigerant on all types of refrigeration and air conditioning systems. Capacities: Fractional tonnage to 200 tons. Refrigerants: R-12. R-22, R-500, R-502, etc. AVAILABLE WITH NEW ALL-PURPOSE "W" POWER ELEMENT CHARGE OR OTHER STANDARD CHARGES. Low temperature valves for applicants below --40*F. evaporator temp. TYPE 402 with or without pressure limit, ing feature TYPE SI TYPE POS Valve--with integral solenoid stop valve--maintains positive control over wide ranges in load. TYPE TCL with either angle or straight-thru conneetons TYPE S2 SOLENOID VALVES FOR ALL TYPES OF SERVICE. Liquid, np to 75 tons Refrigerant 12, 110 tons Refngerant 22. Suction, ap to 10 tons Re frigerant 12, 15 tons Refrigerant 22. For discharge gas, brine, water, steam, air or oil service. Operate with pressure differ entials to 30b psL AMMONIA CONTROLS TYPE M3 TYPE TER, TIR, THR with either angle or straight - thru connections TYPE R2-R6 TYPE TX VENTURI-FLOW DISTRIBUTORS Wide application range. One piece con struction ; replace distributors requir ing as many as 6 or 7 nozzle*. FLOAT SWITCHES TYPE J56 ELECTRIC FLOAT SWITCH. For Refrigerant 12. 22. Ammonia and other noncorrosive liquids having a specific gravity of 0.6 or more and a maximum viscosity of 5.000 Saybolt Universal Seconds ap to 230 volts, AC or D.C 90S LECTRO-LEVEL . . . ELECTRONIC REMOTE CONTROL OF LIQUID LEVEL. Ac curate control for full-flooded evaporators. Ad justable to a wide range of level changes. Easyto-set control dials conveniently mounted in remote box. FILTER-DRIERS ADR DRI-K.LEANERS-- 13 lira, sealed or re placeable block type. Features exclusive block form desiccant (97% pure), shock-proof con struction, copper (O.D.S.) or brass (SAX.) fittings simplify installation. with strainer Solenoid Liquid Valves--ap to 172 tons. Solenoid Suction Valves--ap to 28 tons. Thermo Expansion Valves--from frac tional tonnage to 125 tons. Automatic Ex pansion Valves--from fractional tonnage to 60 tons. Evaporator Pressure Regula tors--up to 675 tons. SUCTION LINE CONTROLS TYPE 771-772 SUCTION PRESSURE (HOLD BACK) REGULATORS. Prevent motor overload. Refrigerants 12 and 22, 500 and 502. / TYPE EPR EVAPORATOR PRESSURE REGULATORS. For all refrigerants, %" to 6" port she, ODF, FPT or welding socket flanged con nections. "EVAPOTROL" EVAPORATOR PRESSURE REGULATORS: Type 760: % Ton R-12 or R-500 Type 435: 1 Ton R-12 or R-500 it {; \' $ fi