York DH 036 Technical Manual
Also see for CSA DH 036: Technical guide
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Contents
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036-21506-003-C-040534 Unitary Products GroupCoils:a. Evaporator and condenser coils shall have alumi-num plate fins mechanically bonded to seamlessinternally enhanced copper tubes with all jointsbrazed. Special Phenolic coating shall be availableas a factory option.b. Evaporator and Condenser coils shall be of thedirect expansion, draw-thru, design.Refrigerant Circuit and Refrigerant Safety Components shallinclude:a. Thermal expansion devices (TXV’s).b. Filter drier/strainer to eliminate any moisture or for-eign matter.c. Accessible service gage connections on both suc-tion and liquid lines to charge, evacuate, and mea-sure refrigerant pressure during any necessaryservicing or troubleshooting, without losing charge.d. The refrigeration system shall provide at least 15°Fof sub-cooling at design conditions.UNIT CONTROLSa. Unit shall be complete with self-contained low-volt-age control circuit protected by a resetable circuitbreaker on the 24-volt transformer side.b. Unit shall incorporate a lockout circuit which pro-vides reset capability at the space thermostat orbase unit, should any of the following standardsafety devices trip and shut off compressor.c. Loss-of-charge/Low-pressure switch.d. High-pressure switch.e. Freeze-protection thermostat, evaporator coil.f. If any of the above safety devices trip, a LED (light-emitting diode) indicator shall flash a diagnosticcode that indicates which safety switch has tripped.g. Unit shall incorporate “AUTO RESET” compressorover temperature, over current protection.h. Unit shall operate with conventional thermostatdesigns and have a low voltage terminal strip foreasy hook-up.i. Unit control board shall have on-board diagnosticsand fault code display.j. Standard controls shall include anti-short cycle andlow voltage protection, and permit cooling operationdown to 0°F.k. Control board shall monitor each refrigerant safetyswitch independently.l. Control board shall retain last 5 fault codes in nonvolatile memory which will not be lost in the event ofa power loss.GAS HEATING SECTIONShall be designed with induced draft combustion with postpurge logic, energy saving direct spark ignition, and redun-dant main gas valve. Venter wheel shall be constructed ofstainless steel for corrosion resistance. The heat exchangershall be of the tubular type, constructed of T1-40 aluminizedsteel for corrosion resistance and allowing minimum mixedair entering temperature of 25°F. Burners shall be of theinshot type, constructed of aluminum coated steel and con-tain air mixture adjustments. All gas piping shall enter the unitcabinet at a single location through either the side or curbwithout any field modifications. An integrated control boardshall provide timed control of evaporator fan functioning andburner ignition. Heating section shall be provided with the fol-lowing minimum protection:a. Primary and auxiliary high-temperature limitswitches.b. Induced draft motor speed sensor.c. Flame roll out switch (manual reset).d. Flame proving controls.ELECTRIC HEATING SECTIONAn electric heating section, with nickel chromium elements,shall be provided in a range of 5 thru 30 KW, offering twostages of capacity - 16 KW and above on 208/230 volt heatersand 20 KW and above on 460 and 575 volt heaters. The heat-ing section shall have a primary limit control(s) and automaticreset to prevent the heating element system from operating atan excessive temperature. The heating section assemblyshall slide out of the unit for easy maintenance and service.Units with Electric Heating shall be wired for a single pointpower supply with branch circuit fusing (where required).UNIT OPERATING CHARACTERISTICSa. Unit shall be capable of starting and running at 125°Foutdoor temperature, exceeding maximum load crite-ria of ARI Standard 210/240. The compressor, withstandard controls, shall be capable of operationdown to 0°F outdoor temperature. Unit shall be pro-vided with fan time delay to prevent cold air deliverybefore heat exchanger warms up (Gas heat only).ELECTRICAL REQUIREMENTSAll unit power wiring shall enter unit cabinet at a single factoryprovided location and be capable of side or bottom entry, tominimize roof penetrations and avoid unit field modifications.Separate side and bottom openings shall be provided for thecontrol wiring.STANDARD LIMITED WARRANTIES• Compressor 5 Years• Heat Exchanger 10 Years• Electric Heat Element 5 Years• Other Parts 1 Year |
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