See Fig. 1. for location of gas valve. Refer to Fig. 2 while proceeding with the following steps: Step 1 — Set room thermostat to the lowest temperature setting andset SYSTEM switchtoOFF position. Step 2 — Close the shutoff valve on the gas supply piping. Step 3 — Turn off the electrical supply to the unit and install lockout tag. Step 4 — Open the heat section access panel. Step 5 — Move ON/OFF switch on the internal main gas valve to the OFF position an Step 6 — Move ON/OFF switch on internal

-MANUAL RESET, SPST-(N.C.) FSE FLAME PROVING ELECTRODE FU1 FUSE, 3 AMP, AUTOMOTIVE BLADE TYPE, FACTORY INSTALLED FU2 FUSE OR CIRCUIT BREAKER CURRENT INTERRUPT DEVICE (FIELD INSTALLED & SUPPLIED) GND EQUIPMENT GROUND GV GAS VALVE-REDUNDANT OPERATORS GVR GAS VALVE RELAY, DPST-(N.O.) HI/LO BLOWER MOTOR SPEED CHANGE RELAY, SPDT HSI HOT SURFACE IGNITOR (115 VAC) HSIR HOT SURFACE IGNITOR RELAY, SPST-(N.O.) HUM 24VAC HUMIDIFIER CONNECTION (.5 AMP. MAX.) IDM INDUCED DRAFT MOTOR IDR INDUCED DRAFT RELAY,

13221 Fan Sections and Accessory Electric Heaters CONTENTS Page . 2 SAFETY CONSIDERATIONS.......... MODULAR SYSTEM INTRODUCTION.......................2,3 INSTALLATION........................3-9 Step 1 — Inspect Equipment............ 3 Step 2 — Determine Position of Unit by Airflow Direction........................ 3 Step 3 — Assemble Required Unit......3-7 Step 4 — Connect Ductwork to Unit Supply and Return Air Openings........7,8 Step 5 — Insulate Ductwork.............8 Step 6 —

SAT 1 J8 – 1,2 (SGC) Supply Air Thermistor (SAT) — Inserted into supply section underneath the gas heat section (factory-provided, field-installed) HH79NZ016 SAT 2 J8 – 3,4 (SGC) Supply Air Thermistor (SAT) — Inserted into supply section underneath the gas heat section (factory-provided, field-installed) SAT 3 J8 – 5,6 (SGC) Supply Air Thermistor (SAT) — Inserted into supply section underneath the gas heat section (factory-provided, field-installed) 30 Fig. 24 — Supply-Air Thermistor Connections

This unit combines superior performance with compactness, versatility of application and ease of installation to supply year-round air conditioning for commercial and industrial buildings The unit is completely factory assembled, charged and tested Requires only natural gas, and suitable electrical and duct connections for hookup. Air can be supplied to the building either thru bottom of the unit or thru the side A manually-adjustable outdoor air intake is provided Condensers are air cooled Low

Immediately call a qualified service technician to inspect the unit and to replace any part of the control system and gas control which has been under water. MAINTAINING YOUR UNIT All maintenance should be handled by skilled, experienced personnel. Your dealer can help you establish a standard procedure. For your safety, keep the area around the unit clear and free of combustible materials, gasoline and other flammable liquids and vapors. To assure proper functioning of the unit, the flow of

S. 50 60 70 80 STEP 1 STEP 4 48D J D, LJ D005-009 48D J E, LJ E004-007 48DJD.LJD012,014 48DJE.LJE008-012 STEP 5 Fig. 3 — To Shut Unit Off 4 48DJD.DJE Fig. 4 — Filter Access Door/Panel Location Heat Exchanger — To ensure dependable and efficient heating operation, the heat exchanger should be checked by a qualified maintenance person before each heating season, and cleaned when necessary. This checkout should not be attempted by anyone not having the required expertise and equipment to

TABLE OF CONTENTS PAGE SAFETYCONSIDERATIONS ....................... 1- --2 INTRODUCTION ................................... 2 RECEIVINGANDINSTALLATION ................. 2- --13 CheckEquipment .................................. 2 IdentifyUnit .................................... 2 InspectShipment................................. 2 ProvideUnitSupport ............................... 2 RoofCurb ...................................... 2 SlabMount ..................................... 2 FieldFabricateD

24). Make sure OAT terminals are up. 12. Place knob, supplied with economizer, on OAT. Set it for 3 F below indoor room thermostat setting. If accessory solid-state enthalpy control (EC) is used instead of the OAT, see instructions shipped with EC for installation and adjustment (see Fig. 24). 13. Connect OAT per Fig. 25. 14. Slide outdoor-air inlet screens into screen track on hood side plates. While holding screens in place, fasten screen retainer to hood using screws provided. 15. Turn on

Do not loosen or remove compressor holddown bolts. Internal Wiring — Check all electrical connections in unit control boxes. Tighten as required. Refrigerant Service Ports — Each unit system has 3 Schrader-type service gage ports: one on the suction line, one on the liquid line, and one on the compressor discharge line. Be sure that caps on the ports are tight. One Schrader-type valve is located under both the high-pressure switch and the low-pressure switch. Cooling — Set space thermostat t