3RECEIVING EQUIPMENTOn receipt of the equipment, visually check forexternal damage to the carton or the shipping crate. Ifthe carton or shipping crate is damaged, make a noteon the Bill of Lading and report the damage to theCarrier immediately. Remove the heater from thecarton or the shipping crate.Do NOT use the shipping crate base as an instal-lation base.On occasion, items are shipped loose. Be sure thatyou receive the number of packages indicated on theBill of Lading.When ordering parts, you must specify Model andSerial Number of the heater. When ordering underwarranty conditions, you must also specify date ofinstallation.Raypak recommends that this manual be reviewedthoroughly before installing your Raypak heater. Ifthere are any questions which this manual does notanswer, please contact the factory or your local Raypakrepresentative.Claims for shortages and damages must be filedwith carrier by consignee. Permission to return goodsmust be factory-authorized and are subject to a stock-ing charge.Purchased parts are subject to replacement onlyunder the manufacturer's warranty. Debits for defec-tive replacement parts will not be accepted and will bereplaced in kind only per our standard warranties.MODEL IDENTIFICATIONThe model identification number and the heaterserial number are found on the heater data plate. Themodel number will have the form WH1-0514A or simi-lar depending on the heater model.(WH = Hot Water Supply System, 1 = on/off firing, 0514= size of heater).Rated inputs are suitable for up to 2000 feet eleva-tion. For elevations above 2000 feet, reduce input 4%for each 1000 feet above sea level.GENERAL SPECIFICATIONSThe Raypak water heaters are design certified andtested under the latest requirements of the AmericanNational Standard, ANSI Z21.10.3. Each heater hasbeen constructed and pressure tested in accordancewith the requirements of Section IV of the AmericanSociety of Mechanical Engineers Code, and factory firetested.ALL MODELS (APPROVED)All models are National Board approved. Tem-perature and pressure gauge is standard. Intermittentignition device is standard on models 0514 and up.Model 0133 has 4-pass heat exchanger, 1 tube perpass.Models 0181-0401 have 2-pass heat exchangers,5 tubes first pass, 4 tubes second pass.Models 0514-1826 have 2-pass heat exchangers,5 tubes first pass, 4 tubes second pass.Models 2100-4001 have 2-pass heat exchangers,9 tubes per pass.Models 926-4001 have optional single pass withcast iron headers only.HOT WATER SUPPLY HEATERSAll Raypak hot water supply heaters are ASME anddesign certified as hot water heaters, with 125 PSIpressure relief valves.TYPE WH1 WITH ON/OFF CONTROLSModels 0133-4001To be used with storage tank systems. Availablewith integrally mounted pump, factory mounted andwired for models 0133-1826. Models 181,261,331 and401 are Low NOx Hot Water Heaters.TYPE WH2 WITH MODULATING CONTROLSModels 0133-4001Hot water supply heater with 110°-170°F gasmodulation. Available with integrally mounted pump,factory mounted and wired for models 0133-1826. Tobe used with storage tank systems.TYPE WH3 WITH 2-STAGE CONTROLSModels 0181-4001Hot water supply heater with low-high fire for2-stage control. Available with integrally mountedpump, factory mounted and wired for models 0181-1826. To be used with storage tank systems.TYPE NH INSTANT-PAKModels 0514-1826Tankless instantaneous direct fired hot water sup-ply heater with 110°-170°F gas modulation, factorymounted bronze body or cast iron bronze fitted pumpand flow switch.CALIFORNIA PROPOSITION 65 WARNING:This product contains chemicals known to the Stateof California to cause cancer, birth defects or otherreproductive harm.