AAON ® RM SERIES HEATING • COOLING & COMBINATION ROOFTOP UNITS USERS INFORMATION 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 OWNER'S INFORMATION ………………………………………………………………………………3 - 4 HEATING / COOLING SYSTEMS …………………………………………………………………… 4 - 5 Gas Unit Lighting Instructions PERIODIC INSPECTION PROCEDURES…………………………………………………………… 6 - 7 SERVICE, TROUBLE SHOOTING & MAINTENANCE …………………………………………… 8 Lubrication Cleaning FILTER INSTALLATION / REPLACEMENT ……………………………………………………… 9 SERVICING …………………………………………………………………………………………… 10 - 12 Rooftop Unit Replacement Parts SEQUENCE OF OPERATIONS …………………………………
OWNER'S INFORMATION 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 heating. ! ▲ WARNING Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit to OFF at disconnect switch(es). Unit may have multiple power supplies.
OWNERS INFORMATION continued ! IMPORTANT NOTICE: All gas-fired heat exchangers are completely tested at the factory before shipment. This will remove nearly all of the oils that have been used in the manufacturing process, however, trace amounts may remain. When performing the initial start-up at the jobsite, it is highly recommended that people or any other living animals, that may be sensitive to the residual odors or gases, NOT be present in the conditioned space during the start-up.
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 ! ▲ WARNING HEATING • ELECTRIC 1. Set thermostat in the heat mode. Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit to OFF at disconnect switch(es). Unit may have multiple power supplies. 2. Set thermostat to call for heat to engage all electric heat strips. Check blower for proper rotation and voltage. 3. Measure the amperage and voltage.
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. 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 II. VAV (Variable Air Volume) SYSTEMS POWER EXHAUST w/ FULL MODULATING ECON. In the unit "OFF" or in the minimum economizer position, the power exhaust is off. As the economizer begins to modulate open, an end switch (adjustable) closes which starts the power exhaust fan motor. The power exhaust operates until the economizer modulates below the end switch setting or the unit is shut off. NOTE: VAV BOXES AND CONTROLS ARE SUPPLIED BY OTHERS FOR FIELD INSTALLATION.
RM SERIES AAON ® USERS INFORMATION MANUAL AAON, Inc.
