Installation and User Manual HB Series Package Units & Air Handlers • R-410A DX or Chilled Water Cooling • Gas, Electric or Hot Water Heat • Bottom or Side Discharge R-410A Package FOR YOUR SAFETY WHAT TO DO IF YOU SMELL GAS • EXTINGUISH ANY OPEN FLAME • DO NOT TOUCH ANY ELECTRICAL SWITCH • DO NOT TRY TO LIGHT ANY APPLIANCE • DO NOT USE ANY PHONE IN YOUR BUILDING • IMMEDIATELY CALL YOUR GAS SUPPLIER FROM A NEIGHBOR’S PHONE. FOLLOW THE GAS SUPPLIER’S INSTRUCTIONS.
Contents 1. Owner should pay particular attention to the words: NOTE, CAUTION, and WARNING. NOTES are intended to clarify or make the installation easier. CAUTIONS are given to prevent equipment damage. WARNINGS are given to alert owner that personal injury and/or equipment damage may result if installation is not handled properly.
1. Description WARNING Important Safety Information RISK OF ELECTRICAL SHOCK Before attempting to perform any service or maintenance, turn the electrical power to the unit OFF at disconnect switch(es). Unit may have multiple power supplies. ONLY QUALIFIED PERSONNEL SHOULD PERFORM INSTALLATION, OPERATION, AND MAINTENANCE OF EQUIPMENT DESCRIBED IN THIS MANUAL.
Package Unit Orientation (Compressorized) Service access is from the front of the unit. As you face the front of the unit, the condensing section will be on the right end of the unit, and the air handling section on the left. The drain connection is located on the back.
Air Handling Unit Orientation (Non-Compressorized) Service access is from the front of the unit. As you face the front of the unit, the controls section will be on the right end of the unit, and the air handling section on the left. The drain connection is located on the back.
2. Model Number Description Unit Model Number Main Features Model HB Nom.
air temperatures (typically air temperatures below 40°F) that could cause coils to freeze. 3. User’s Information WARNING Figure 7a, Piping Chase Location Failure to observe the following instructions may result in premature failure of your system, and possible voiding of the warranty.
Multiple Unit Operation Night and Vacancy Operation When several units are used in conditioning the space, and any are combination heating-cooling units, all system thermostat switches must be set at either heating, cooling, or set at ‘OFF’. Do not run part of a system switched to an opposite mode. Cooling only units should be switched to ‘OFF’ at the thermostat during the heating season.
Filter Sizes Modulating Hot Gas Reheat and Hot Gas Bypass Systems on DX Units Table 9.1, Pleated Filter Sizes Some DX cooling units may contain Modulating Hot Gas Reheat (MHGRH) and/or Hot Gas Bypass (HGBP) systems as factory installed options. Piping and valves for these systems will be located on the inside wall of the condenser section. The condenser top must be removed for access to these components.
4. Delivery 5. Installation ALL SHIPMENTS ARE F.O.B. THE FACTORY. IT IS THE RESPONSIBILITY OF THE RECEIVING PARTY TO INSPECT THE EQUIPMENT UPON ARRIVAL. General DX models of this unit use R-410A refrigerant only, and should not be used with any other refrigerant. HB package units are for outdoor installation only. Receipt & Inspection The unit should be inspected for damage that may have occurred in transit.
ELECTRIC HEATING SYSTEM warranty. Attach all service panels, and cover all exposed equipment when work is not being performed. Leave unit protected from other construction until startup is to occur. Heating is accomplished by passing electrical current through a specified amount of resistance heaters that produce the required heat. The indoor blower motor energizes at the same time as the heaters.
Service & Installation Clearances Figure 12b, Airflow Clearance Minimums Before setting the unit into place, caution must be taken to provide clearance for unit panels/doors that must be accessible for periodic service. These areas contain the controls, safety devices, refrigerant, shutoff valves and filter access. Adjacent Condenser HB package units have minimum service and airflow clearance requirements.
Setting the Unit NOTE Units should always be installed level, and above water drainage routes. Unit operation can be affected by wind. It is good practice to position unit condensing sections away from prevailing winds. PRIOR TO SETTING UNIT ON CURB – To ensure proper isolation and seal between the unit and the curb, gasket material MUST BE APPLIED to the curb on ALL SURFACES meeting with the unit.
Electrical Figure 14a, Lifting Lugs and Outside Air Hood Check the unit data plate to make sure it matches the power supply. Connect power to the unit according to the wiring diagram provided with the unit. The power and control wiring may be brought in through the utility entry. Do not run power and control wires in the same conduit. Lifting lug on each corner Protect the branch circuit in accordance with code requirements.
Figure 15a, Power and Control Wiring Compressor and Control Compartment Standard Control Board Red, yellow and green LEDs for fault, mode, and power indicators. Standard Control Board has low voltage terminals for R, G, Y1, Y2, W1, W2, W3 & GND. GND is the ground, or “C” side of the low voltage power supply transformer. Optional Control Board Optional Control Board has expanded capability to support optional unit features. Connect control wiring to low voltage terminal block.
Table 16.2, Optional Control Board Blink Codes Each HB has a standard Cooling Lock-out feature that prevents the compressor cooling mode when the outdoor temperature is below 55°F. Each unit also has a condenser fan cycle feature that delays the start of the condenser fan until there is satisfactory compressor discharge pressure.
2 Step Compressor Cooling Models Factory Installed − The HB models with a 2 step cooling compressor may use a 2 step cooling thermostat with the R, G, Y1, Y2 & W terminals connected to the similarly labeled terminals on the Control Board in the HB unit. − These HB models can also be connected to a single step cooling thermostat with the Y terminal on the thermostat connected to the Y2 terminal on the Control Board in the HB unit.
Figure 18a, External Control Inputs to Control Board 18
Modulating Hot Gas Reheat Example: We want the Discharge Air Temperature Setpoint to increase from 55°F when the Reset Input signal is at 0 Volts, to 75°F when the Reset Input signal is at 10 Volts. • Set the SETPOINT DIP Switch to 55°F • Set the RESET LIMIT DIP Switch to 75°F The modulating hot gas reheat option is used to provide additional moisture removal capacity to the HB unit.
Figure 20a, Reheated Supply Air Temperature 20
Gas Piping Table 21.2, Gas Piping Support Intervals Size gas piping to supply the unit with 6” to 10.5” water column (w.g.) pressure for natural gas, or 11” w.g. for propane (when a natural gas to propane conversion kit has been field installed) 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.
Figure 22a, Gas Piping Gas Valve Valve Inlet Piping to gas valve inlet must be completed in field. Gas valve installed at factory. Sidewall Entry Bottom or Side Utility Entry Options Run piping through utility entry in front of unit, or through entry in floor of unit located next to the compressor. Then run piping through sidewall into heating cabinet. Remember to seal around all exterior cabinet penetrations at utility entries. Piping assembly ready to connect to field supplied gas line.
Condensate Piping 6. Start-Up HB package units are equipped with a condensate drain connection, and ‘P’ traps are furnished with the equipment. The drain connection must be used and individually trapped to ensure a minimum amount of condensate accumulation in the drain pans. General ONLY QUALIFIED, AUTHORIZED PERSONNEL SHOULD POWER ON, OR START-UP THIS EQUIPMENT.
excessive sound, or vibration. Follow procedures outlined below to start each piece of equipment. Before powering on, or starting the unit: DX Cooling: 1. Ensure that drain P-trap is installed. 2. Turn the unit power on. 3. Turn the unit blower on, and check for correct rotation. 4. If correct, take blower amp readings, and compare to see if the amp draw is within the safety factor area of the motor. 5. Check and record ambient temperature. 6. Start the first stage cooling circuit, and blower circuit. 7.
Electric Heating: Water Balancing 1. Turn the unit power on. 2. Turn the unit blower on, and check for correct rotation. 3. If correct, take blower amp readings, and compare to see if the amp draw is within the safety factor area of the motor. Once correct, turn blower off. 4. Turn on the first stage of heating. 5. Check amp draw of each element of each stage. 6. Ensure blower started with heat. 7. Check temperature rise across heating section while all stages are on. 8.
costs during the year. As a minimum, clean the condenser coil at the beginning of each cooling season. It is preferable to use a medium pressure water spray from the inside of the condenser cabinet with a non-corrosive coil cleaning solution. TURN OFF all power to the unit before cleaning. 7. Operation & Maintenance General Immediately following building occupancy, the air conditioning system requires a maintenance schedule to assure continued successful operation.
Heating Sequence Filters On a call for heating, the supply fan will go to high speed, and the first stage of heating will be energized. The unit will go through a 5 second pre-purge of air in the heat exchanger, then it will come on, or ignite if gas heat. If the unit has a second heating stage, then stage two will come on with a call for W2 after the stage up delay. If W2 is called for before W1, then heat stage one will come on first, then heat stage two will follow after the stage up delay.
The modulating hot gas valve is factory mounted and wired. The control board is shipped with a default setting for a neutral discharge air temperature of 75°F. The factory setting can be overridden by connection to a 0 to 10 VDC signal from another control system. 8. Hot Gas Bypass The purpose of external hot gas bypass (HGBP) is to prevent coil freeze-up and compressor damage from liquid slugging during periods of low airflow operation, or with low entering air temperatures.
Pressure – Temperature Chart R-410A (° F) PSIG (° F) PSIG (° F) PSIG (° F) PSIG (° F) PSIG 20 78.3 50 142.2 80 234.9 110 364.1 140 540.1 21 80.0 51 144.8 81 238.6 111 369.1 141 547.0 22 81.8 52 147.4 82 242.3 112 374.2 142 553.9 23 83.6 53 150.1 83 246.0 113 379.4 143 560.9 24 85.4 54 152.8 84 249.8 114 384.6 144 567.9 25 87.2 55 155.5 85 253.7 115 389.9 145 575.1 26 89.1 56 158.2 86 257.5 116 395.2 146 582.3 27 91.0 57 161.
AAON, Inc. 2425 S. Yukon Tulsa, Oklahoma 74107 Tel 918-583-2266 Fax 918-583-6094 Download this manual, and others from: www.aaon.com It is the intent of AAON to provide accurate and current specification information. However, in the interest of product improvement, AAON, Inc. reserves the right to change pricing, specifications, and/or design of its products without notice, obligation, or liability. AAON is a registered trademark of AAON, Inc.
