AAON ® RM SERIES HEATING • COOLING & COMBINATION ROOFTOP UNITS INSTALLATION INSTRUCTION MANUAL 7-2003 ! WARNING ▲ FOR YOUR SAFETY WHAT TO DO IF YOU SMELL GAS • EXTINGUISH ANY OPEN FLAME. If the information in this manual is not followed exactly, a fire or explosion may result causing property damage, personal injury or loss of life. • DO NOT TOUCH ANY ELECTRICAL SWITCH. • DO NOT TRY TO LIGHT ANY APPLIANCE. • DO NOT USE ANY PHONE IN YOUR BUILDING.
AAON® TABLE OF CONTENTS SECTION PAGE NUMBER GENERAL DESCRIPTION …………………………………………………………………………… 03 Unpacking Certification Codes and Ordinances OWNER'S INFORMATION …………………………………………………………………………… 04 HEATING / COOLING SYSTEMS …………………………………………………………………… 05 INSTALLATION ………………………………………………………………………………………… Setting the Curb / Unit ………………………………………………………………………… Service Clearances Outside Air Hood………………………………………………………………………………… Electrical Gas Piping………………………………………………………………………………………… Condensate Piping ………………………………………
GENERAL DESCRIPTION ! WARNING ▲ The units are designed as self-contained heating, cooling or combination units for outdoor installation only, using the refrigerant shown on the rating plate, chilled water, natural or propane gas, electric resistance, steam or hot water. Improper installation, adjustment, alteration, service or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a qualified installer, service agency or the gas supplier.
OWNER'S INFORMATION WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause property damage, personal injury or loss of life. Installation and service must be performed by a qualified installer, service agency or if gas fired units, the gas supplier. Refer to installation instructions provided with the unit and this manual. WARNING Failure to observe the following instructions will result in premature failure of your system, and possible voiding of the warranty.
HEATING & COOLING SYSTEMS INSTALLATION IS TO BE ADJUSTED TO OBTAIN AN AIR TEMPERATURE RISE WITHIN THE RANGE SPECIFIED ON THE RATING PLATE. NORMAL OPERATION HEATING Set the thermostat system switch to "HEAT". Set the thermostat fan switch to "AUTO" or "ON". Set the thermostat temperature at the desired point. The units are equipped with a direct spark ignition system which proves the burner operation during each call for heat. Power to the ignition control is 24 Vac to reduce hazards.
INSTALLATION ▲! ! ▲ CAUTION If outside air is in contact with the bottom of the unit, the unit must have the bottom insulation option or be field insulated. WARNING INSULATION MATERIALS MAY BE COMBUSTIBLE GASKET DO NOT DRILL OR PUNCH HOLES IN BASE OF UNIT FROM INSIDE THE UNIT OR FROM BELOW TO ATTACH DUCTWORK. LEAKING MAY OCCUR IF UNIT BASE IS PUNCTURED.
INSTALLATION continued Prior to setting the unit onto the roof curb, be sure that the gasket material has been applied to curb on all surfaces meeting with the unit. Hoist unit to a point directly above the curb and duct openings. Carefully lower and align the unit with utility and duct openings unit perimeter fits around the curb. Make sure the unit is properly seated on the curb and is level. AAON Rooftop units are designed for fast, easy installation.
INSTALLATION continued ELECTRICAL Verify the unit data plate voltage agrees with the power supply. Route power and control wiring through the utility entry. Do not run power and signal wires in the same conduit. Connect power according to the (unit specific) wiring diagram provided. OUTSIDE AIR HOOD CAUTION: Prior to unit operation, the outside air hood must be opened as shown below: APPLY SILICONE CAULKING ON TOP & BOTH SIDES OF AIR HOOD Protect the branch circuit in accordance with code requirements.
INSTALLATION continued GAS PIPING Size gas piping to supply the unit with 6" to 10.5" water column pressure for natural gas or 11" water column pressure for propane when all gas consuming devices in the building connected to the same gas system are operating. Install piping in accordance with local codes, the piping must conform with the latest ANSI-Z223.1 National Fuel Gas Code; in Canada, Current Standard CAN / CGA-B149, Installation Codes for Gas Burning Appliances and Equipment.
INSTALLATION continued ! CONDENSATE PIPING AAON units are equipped with drain connections and 'P' traps are furnished with the equipment. All drain connections must be used and individually trapped to ensure a minimum amount of condensate accumulation in the drain pans. WARNING DO NOT USE OPEN FLAME OR OTHER SOURCE OF IGNITION FOR LEAK TESTING. When pressure testing the gas supply piping, the furnace must be isolated or disconnected by closing the individual manual shut-off valve from the gas supply.
GAS UNIT LIGHTING INSTRUCTIONS FOR YOUR SAFETY READ BEFORE OPERATING WARNING: IF YOU DO NOT FOLLOW THESE INSTRUCTIONS EXACTLY, A FIRE OR EXPLOSION MAY RESULT CAUSING PROPERTY DAMAGE, PERSONAL INJURY OR LOSS OF LIFE. A. B. • • • This appliance does not have a pilot. It is equipped with an ignition device which automatically lights the burner. Do not try to light the pilot by hand. • If you cannot reach your gas supplier, call the fire department. C.
PERIODIC INSPECTION PROCEDURES GAS HEATING UNITS 1. The flow of combustion and ventilating cannot be obstructed in any way. The indoor blower, evaporator coil and filters must be inspected monthly. 2. Once each year, prior to the heating season, a qualified technician must inspect all flue product carrying areas of the furnace and main burners for continued safe operation.
PERIODIC INSPECTION PROCEDURES Continued COOLING 1. Main Power Switches are on and power is to the unit. HEATING • ELECTRIC 1. Set thermostat in the heat mode. 2. Set thermostat in cooling mode and place the "fan" switch to on. Check blower for correct operating direction, amperage and voltage. 2. Set thermostat to call for heat to engage all electric heat strips. Check blower for proper rotation and voltage. 3. PACKAGED UNITS - Check compressor operation.
SERVICING, TROUBLE SHOOTING & MAINTENANCE ! ▲ LUBRICATION All original blower motors and bearings are furnished with an orginal factory charge of lubrication. Some applications will require that bearings be re-lubricated periodically. The schedule will depend on the operating duty, temperature variations or other harsh atmospheric conditions. WARNING ELECTRIC SHOCK HAZARD. Shut off all electrical power to unit to avoid shock hazard or injury from rotating parts.
FILTER INSTALLATION / REPLACEMENT ! ▲ Before inspecting or replacing the filters, be sure the unit IS NOT operating. The filters are located in the filter access section of the unit. Open filter access door, and pull filters straight out to inspect. Inspect ALL filters each time. Replace filters with the size indicated on each filter or as shown in the filter chart below. Arrow on replacement filters must point towards the blower. Monthly inspection is required to maintain optimum efficiency.
SERVICING POSSIBLE CAUSE TROUBLE ELECTRIC HEATING SYSTEM OFF 1. Check power at line side of contactor(s). 2. Thermostat not set for heating. EVAPORATOR MOTOR WILL NOT RUN 1. Overload relay tripped. 2. Heater Relay not energized. 3. Blower Contactor not energized. 4. Capacitor shorted or open (PSC motors only). BLOWER DOESN'T DELIVER AIR 1. Blower running backwards. 2. Dirty air filters. 3. Dirty coils. 4. Duct obstruction. 5. Belts loose (if applicable). BLOWER COMES ON, BUT LITTLE OR NO HEAT 1.
SERVICING Continued POSSIBLE CAUSE TROUBLE STEAM AND HOT WATER HEATING SYSTEM OFF 1. Check power at line side of contactor(s). 2. Thermostat not set for heating. BLOWER MOTOR WILL NOT RUN 1. Overload relay tripped. 2. Heater Relay not energized. 3. Blower Contactor not energized. BLOWER DOESN'T DELIVER AIR 1. Blower running backwards. 2. Dirty air filters. 3. Dirty coils. 4. Duct obstruction. 5. Belts loose (if applicable). 1.
SERVICING Continued POSSIBLE CAUSE TROUBLE COOLING - CHILLED WATER SYSTEM OFF 1. Check power at line side of contactor(s). 2. Thermostat not set for cooling. EVAPORATOR BLOWER WILL NOT RUN 1. Overload thermal protector open in motor. 2. Contactor not closing. 3. Motor failed. FAN MOTOR RUNS HOT AND CUTS OUT 1. Line voltage too high. BLOWER DOES NOT DELIVER AIR 1. Blower running backwards. 2. Dirty air filters. 3. Duct obstruction. 4. Belt loose (if applicable).
SEQUENCE OF OPERATIONS I. GENERAL INFORMATION A. HEATING B. COOLING 1. Natural Gas When the thermostat calls for heating, W1 makes R to the heat relay (HR). All N.O. (Normally open) contacts close and all N.C. (normally closed) contacts open. The combustion motor starts and as the pressure decreases in the flue outlet box the ignition control is energized. The control sends 24 VAC to the main gas valve and high voltage to the ignitor.
SEQUENCE OF OPERATIONS Continued B. Full modulating economizer, a full modulating power exhaust will control the amount of actual exhausted air by means of a building sensing pressure control which opens or closes according to desired pressure in the space. II. VAV (Variable Air Volume) SYSTEMS NOTE: VAV BOXES AND CONTROLS ARE SUPPLIED BY OTHERS FOR FIELD INSTALLATION. When a call for cooling is received, the controller board stages on compressors to maintain a field set supply air temperature.
COMPRESSOR CHECKOUT PROCEDURE CONTROL PANEL NOT SET FOR COOLING THERMOSTAT NOT CALLING FOR COOLING POWER TO UNIT CHECK UNIT FUSES AND WINDING LO PRESSURE SWITCH OPEN NO POWER TO CONTACTOR HI PRESSURE SWITCH OPEN NO POWER TO UNIT CHECK CIRCUIT BREAKER AT POWER DISTRIBUTION PANEL COMPRESSOR LOW AMBIENT LOCKOUT OPEN (TEMPERATURE OUTSIDE BELOW 55 DEG.
IGNITION CONTROL CHECKOUT PROCEDURE WARNING: ALL SAFETY PRECAUTIONS MUST BE FOLLOWED WHEN EVALUATING THE IGNITION CONTROL SYSTEM ON GAS HEATING UNITS.
AAON , Inc. FACTORY START-UP FORM JOB NAME: DATE: ADDRESS: MODEL No: CITY, STATE: SERIAL No: START-UP CONTRACTOR: RTU No: START-UP CHECK LIST • GENERAL CHECKS Inspect Unit For Damage: Verify All Air Filters Are Installed: Check All Fans For Free Movement: Inspect Economizer Damper Assembly: Verify All Copper Tubing Is Isolated So It Doesn't Rub: Verify Voltage: Check & Tighten All Electrical Terminals: Verify Transformer Tap On 208/230v Equip.
RM SERIES AAON ® INSTALLATION INSTRUCTION MANUAL AAON, Inc.
