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Summary of Contents for Bard Q36A4DA
- Page 1 INSTALLATION INSTRUCTIONS 11EER Q-TEC Q**A4D Series Packaged Air Conditioner Models: Q36A4DA Q42A4DA Q48A4DA Q36A4DB Q42A4DB Q48A4DB Q36A4DC Q42A4DC Q48A4DC Bard Manufacturing Company, Inc. Manual: 2100-752B Bryan, Ohio 43506 Supersedes: 2100-752A Date: 5-14-21 www.bardhvac.com Page 1 of 49...
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Page 2: Table Of Contents
CONTENTS Getting Other Information and Publications ..3 Low Pressure Switch ......27 Freeze Stat Switch .........27 Q-TEC General Information ........4 Logic Control Board ........28 Q-TEC Model Nomenclature ........4 Phase Monitor ............28 Shipping Damage ..........4 Condenser Fan Operation ........28 Unit Removal from Skid .........4 Sequence of Operation ........28 Handling Unit after Removal from Skid ....6 Balanced Climate... -
Page 3: Getting Other Information And Publications
Table 14 10K OHM NTC Sensor: Temperature/ Figure 20 High Voltage Connections .......20 Resistance ..........44 Figure 21 Thermostat Connections ......23 Table 15 Dehumidification Relay Logic Board ..49 Figure 22 Thermostat Connections ......24 Figure 23 Compressor Logic Control Board ....27 FIGURES Figure 24 CCM LED Fault Illumination .... -
Page 4: Q-Tec Tm General Information
Q-TEC GENERAL INFORMATION Q-TEC Model Nomenclature ACCESSORIES AND CONTROL MODEL SERIES OPTIONS X – Standard Controls CAPACITY E – Standard Controls, Low 36 – 3 Ton Ambient Control (LAC) 42 – 3½ Ton 48 – 4 Ton COIL OPTIONS X – Standard A –... -
Page 5: Figure 1 Air Seal Under Q-Tec Unit
FIGURE 1 Air Seal Under Q-TEC Unit Air Seal MIS-1008 FIGURE 2 Removal of Q-TEC Unit from Skid Hold Skid Down C Front Wheels On Floor A Shipping Brackets B Front Wheels Over Edge MIS-1007 Manual 2100-752B Page 5 of 49... -
Page 6: Handling Unit After Removal From Skid
Handling Unit after Removal from Skid FIGURE 4 Q-TEC Unit on Appliance Cart CAUTION Q/TEC UNIT Be careful pushing unit on rollers to prevent the unit from tipping over. Failure to do so could result in personal injury. The unit will have to be turned sideways and removed APPLIANCE CART from skid to fit through a doorway. -
Page 7: Minimum Installation Height
Minimum Installation Height The minimum installation height for ducted applications is 8' 4-1/2". This provides enough The minimum installation height of the unit with a free clearance to install the duct work (see Figure 6). blow plenum is 8' 6". This provides enough clearance for the plenum to be removed (see Figure 5). -
Page 8: Duct Work
Duct Work For hot water coil option, a QPBHW**-F for free blow or QPBHW**-D for ducted airflow is used. All duct work must be properly sized for the design When used with a ducted supply, a Q4CX Cabinet airflow requirement of the equipment. Air Conditioning Extension can be used to conceal the duct work above Contractors of America (ACCA) is an excellent guide to the unit to the ceiling. -
Page 9: Switching Filter Sizes
Switching Filter Sizes All capacity, efficiency and cost of operation information as required for Department of Energy To switch from 1" to 2" filters, remove the filter slide “Energyguide” Fact Sheets are based upon the fresh and bend the tabs down out of the way to accommodate air blank-off plate in place and is recommended for the 2"... -
Page 10: Commercial Room Ventilator (Option)
Commercial Room Ventilator (Option) Before starting, make sure the power has been turned off. The commercial room ventilator (CRV) can be seen after the main front doors are opened. The CRV must be removed to gain access to the mist eliminator. 1. -
Page 11: Installation
INSTALLATION Basic Installation Design and This unit is to be secured to the wall sleeve with mounting brackets provided. The unit itself, the supply Application Planning duct and the free blow plenum are suitable of “0” Successful unit installations require proper planning clearance to combustible material. -
Page 12: Figure 13A Unit Mounting - Method 1
FIGURE 13A Unit Mounting – Method 1 Side Trim (2 PCS.) Enlarged view of mounting bracket showing sleeve to cabinet attachment Side Trim (2 PCS.) Mounting Bracket Wall Sleeve #8 Screw Provided (Light Color) Mounting Bracket Cabinet Side Panel #10 Hex Head Screw Bottom Trim Provided... -
Page 13: Condensate Drain
FIGURE 14 floor or through the wall. If the drain is to be routed Remove Locking Screws from Wheels through an unconditioned space, it must be protected from freezing. The drain line must be able to be removed from the unit if it is necessary to remove the unit from the wall. -
Page 14: Optional Rear Drain Kits
FIGURE 17 Rear Drain (Top View) Drain Line Wall (maximum 10" for rear drain) Sleeve Couplings not shown but recommended for ease of removability for service Wall Bracket Water Trap Unit MIS-977 The drain box permanently mounts onto the wall sleeve Optional Rear Drain Kits and is then either piped directly outdoors, or can be Optional Rear Drain Kit Model QCDS48A is also... -
Page 15: Figure 18A
FIGURE 18A OVERFLOW TUBE CAULK AROUND TUBE WALL SLEEVE DRAIN BOX MIS-2469 FIGURE 18B PLUG INSTALLED IN SIDE Q/Tec DRAIN MIS-2469 REAR DRAIN CONNECTION IN Q/Tec PRODUCT IMPORTANT! 1/2" SLIP X 1/2" SLIP X 3/4" NPT TEE SUPPLIED WITH DRAIN BOX KIT 3/4"... -
Page 16: Figure 18C
FIGURE 18C REMOVE KNOCK-OUT FOR INDOOR DRAIN HOSE CONNECTOR (If used) MIS-2471 A Manual 2100-752B Page 16 of 49... -
Page 17: Figure 18D
FIGURE 18D DRAIN HOSE FROM INDOOR DRAIN PAN. MOVE HOSE FROM ATTACHMENT IN LOWER DRAIN PAN AND SLIDE ONTO DRAIN BOX BARB FITTING, SECURING WITH SUPPLIED CLAMP IF OUTDOOR PAN IS BYPASSED. ( WILL REDUCE RISK OF ALGAE GROWTH IN THE OUTDOOR PAN BUT AT A SLIGHT COOLING PERFORMANCE REDUCTION OF 2-3% ) MIS-2472 A... -
Page 18: Indoor Ducted And Non-Ducted Applications
The spacing between louvers on the grille directly in front of the unit return grilles and registers. shall not be larger than 5/8". Bard recommends at least 2' between solid objects and return grilles or registers. Thermostat or Indoor Temperature Sensor Placement... -
Page 19: Figure 19 Unit Dimensions
FIGURE 19 Unit Dimensions (Width) (Plenum Supply) (Returns) (Trim Width) Q36A4 42.0 30.0 (2) 17.0 43.0 Q42A4 Q48A4 48.0 40.0 (2) 20.0 49.0 All dimensions are in inches. Dimensional drawings are not to scale. TOP VIEW (SHOWN WITHOUT PLENUM) 5.000 SUPPLY AIR OPENING 2.000 1.625... -
Page 20: Wiring - Main Power
Wiring – Main Power The electrical data on the serial plate, in the unit specifications and also in Table 9 on page 37 list fuse Main electrical power must be supplied to the unit and wire sizes (75°C copper) for all models including from a clean, reliable power source. -
Page 21: Wiring - Low Voltage
Wiring – Low Voltage compressor cooling operation. The Y2 terminal is the 24VAC input for compressor cooling standard operation. All 230/208V 1 phase and 3 phase equipment have Y1 and Y2 are connected with a brass jumper bar which dual primary voltage transformers. All equipment leaves can be removed to enable Balanced Climate mode. -
Page 22: Freeze Protection Thermostat
Freeze Protection Thermostat high side system pressure. Operation of the LAC occurs as outdoor temperatures drop below 60ºF. LAC operation An evaporator freeze protection thermostat is supplied cycles the condenser fan on/off based on outdoor with all units. The freeze thermostat cuts out compressor temperature. -
Page 23: Figure 21 Thermostat Connections
FIGURE 21 Thermostat Connections Completestat Model #CS9B-THOA or Model #CS9BE-THOA W1/E Thermostat YO/D W1/E Bard #8403-060 Optional CO2 Controller Bard Part #8403-096 24VAC CO2 OUT TEMP-OUT Unit Low B/W1 Voltage Term. Strip 12-Pin Vent Plug ALL VENT OPTIONS PLUG IN HERE If not equipped with a ventilation option to plug in, a jumper plug must be installed. -
Page 24: Figure 22 Thermostat Connections
Thermostat Connections Units With Dehumidification 8403-038 Mechanical Humidistat T4 Pro 8403-089 T6 Pro 8403-090 8403-092 8403-047 Electronic Humidistat Optional CO2 Controller Bard Part #8403-096 24VAC CO2 OUT TEMP-OUT Unit Low B/W1 Voltage Term. Strip 12-Pin Vent Plug ALL VENT OPTIONS PLUG IN HERE If not equipped with a ventilation option to plug in, a jumper plug must be installed. -
Page 25: Start Up
"Y1" at the compressor control module, first check Topping Off System Charge to make sure that either the optional vent is plugged If a leak has occurred in the system, Bard into the vent connection plug or the supplied jumper Manufacturing recommends reclaiming, evacuating plug is in place. -
Page 26: Important Installer Notes
Three Phase Scroll Compresser Start found on page 36. It is imperative to match the correct pressure table to the unit by model number. Up Information This unit employs high-flow Coremax valves instead of Scroll compressors, like several other types of the typical Shrader type valves. -
Page 27: Over And Under Voltage Protection
(see Figure 23). Troubleshooting Compressor Logic CCM FIGURE 23 The Bard Q**A4D Series is equipped with a high pressure switch, low pressure switch and freeze stat Compressor Logic Control Board switch. The switches are all located in the condenser section of the unit. -
Page 28: Logic Control Board
FIGURE 24 The freeze stat switch is located on the return bend tube located on the evaporator coil. When there is a CCM LED Fault Illumination fault related to the freeze stat switch, a red LED light will give notice by illumination, indicating a fault condition is present. -
Page 29: Balanced Climate Tm Mode
Balanced Climate™ is a great comfort feature that can easily be applied under any normal circumstances. If the Bard air conditioning system is being set up in a typical environment where 72°F is the lowest cooling setpoint, remove the Y1/Y2 jumpers from the upper and lower low voltage strips and install a 2-stage cooling thermostat. -
Page 30: Service
Also ensure the motor is secure in its mounting system, and the mounting system is secure to the unit. The Bard Q-TEC may be equipped with a low EXPOSED MOVING PARTS. ambient control pressure switch. This pressure... -
Page 31: Replacing The Motor
Replacing the Motor This motor is replaced in one piece. The control cannot be replaced separately from the motor. Even if the control is remotely located, the replacement part will be a new control with harness and new motor. The correct replacement motor from the manufacturer that is a direct replacement for the failed motor must be used. -
Page 32: Troubleshooting Ecm Indoor Blower Motors
Troubleshooting ECM Indoor Blower Motors CAUTION: Symptom Cause/Procedure • Noisy blower or cabinet • Check for loose blower housing, panels, etc. Disconnect power from unit before removing or replacing • High static creating high blower speed? connectors, or servicing motor. To avoid electric shock from - Check for air whistling through seams in the motor’s capacitors, disconnect power and wait at least ducts, cabinets or panels... -
Page 33: Replacing Ecm Control Module
Replacing ECM Control Module Verify that the replacement control is correct for the application. Refer to the manufacturer’s authorized To replace the control module for the GE variable-speed indoor blower replacement list. USING THE WRONG CONTROL WILL motor, take the following steps: RESULT IN IMPROPER OR NO BLOWER OPERATION. -
Page 34: Table 6 Troubleshooting Ecm Blower Motors
TABLE 6 Troubleshooting ECM Indoor Blower Motors Part Load Continuous Cooling Heat 1st Heat 1st & Mode of Blower Full Load Dehum. ("Y1-Y2" Bank of Elec. 2nd Bank of Operation (Ventilation Cooling Mode Jumper Heat Elec. Heat Mode) Removed) Thermostat 24 VAC "G", "G", "B/W1",... -
Page 35: Fan Blade Setting Dimensions
Fan Blade Setting Dimensions R-410A Refrigerant Charge The correct fan blade setting for proper air delivery This unit was charged at the factory with the quantity of across the outdoor coil is shown in Figure 29. Refer to refrigerant listed on the serial plate. AHRI capacity and Table 7 for unit specific dimension. -
Page 36: Table 8A Cooling Pressure - Standard Airflow
TABLE 8A Cooling Pressure – Standard Airflow Air Temperature Entering Outdoor Coil °F Return Air Temp Model Pressure (DB/WB) Low Side 75/62 High Side Low Side Q36A4D 80/67 High Side Low Side 85/72 High Side Low Side 75/62 High Side Low Side Q42A4D 80/67... -
Page 37: Table 9 Electrical Specifications Q**A4D Series
TABLE 9 Electrical Specifications − Q**A4D Series No. Field Rated Volts Minimum Maximum Model Power Field Power & Phase Circuit External Fuse Ground Wire Circuits Wire Size Ampacity or Ckt. Brkr. Q36A4DA0Z -A05 230/208-1 -A10 Q36A4DB0Z -B06 230/208-3 -B09... -
Page 38: Table 10 Indoor Blower Performance
TABLE 10 Indoor Blower Performance Balanced Climate Model Rated ESP* Maximum ESP* Vent* Rated CFM* CFM* Q36A4D 0.15 1100 1150 Q42A4D 0.15 1300 1300 Q48A4D 0.20 1500 1500 1050 * These units are equipped with a variable speed (ECM) indoor motor that automatically adjusts itself to maintain approximately the same rate of indoor airflow in both heating and cooling, dry and wet coil conditions and at both 230/208 or 460 volts. - Page 39 GRAPH 1 Q36A4D FAD Ventilation Delivery GRAPH 2 Q42A4D FAD Ventilation Delivery Manual 2100-752B Page 39 of 49...
- Page 40 GRAPH 3 Q48A4D FAD Ventilation Delivery Manual 2100-752B Page 40 of 49...
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Page 41: Dehumidification Unit Instructions
DEHUMIDIFICATION UNIT INSTRUCTIONS Q**A4D dehumidification models provide a unique This mode will allow the indoor blower to run at a dehumidification circuit for periods of low outdoor reduced airflow on the first stage of cooling. A 2-stage ambient temperature and high indoor humidity thermostat connected to Y2 will then allow the airflow conditions. -
Page 42: Troubleshooting The Electronic Expansion Valve
FIGURE 32 to be manually opened first. The valve can be opened High Side Connection manually using the magnetic EEV service tool (Bard Filter Drier P/N 2151-021) shown in Figure 31. To do this, remove FILTER DRIER... -
Page 43: Control Board
Check to see if valve can be moved by manually moving the stepper motor using the EEV service tool shown in Figure 31 (Bard Part # 2151-021). If valve still does not control, check the transducer and thermistor sensors as described on page 43. If sensors are good, replace the valve. -
Page 44: Thermistor Sensor
Thermistor Sensor 1. Make a visual check for broken wire insulation, 4. Compare the resistance reading to Table 14. Use broken wires or cracked epoxy material. sensor ambient temperature. (Tolerance of part is ±10 %.) 2. Disconnect 10k ohm NTC thermistor from the EEV control box. -
Page 45: Air Conditioning Mode Circuit Diagram
EVAPORATOR COIL Air Conditioning Mode Circuit Diagram REHEAT COIL CHECK VALVE CONDENSER COIL SUCTION PRESSURE TRANSDUCER FOR EEV COMPRESSOR 4-WAY VALVE MIS-4017 A EVAPORATOR COIL Dehumidification Mode Circuit Diagram REHEAT COIL CHECK VALVE CONDENSER COIL SUCTION PRESSURE TRANSDUCER FOR EEV COMPRESSOR 4-WAY VALVE MIS-4016 A... -
Page 46: Q36A4D Cooling And Dehumidification Application Data
Q36A4D Cooling and Dehumidification Application Data OD Temp. 75°F 85°F 95°F DB/WB Mode Dehum Dehum Dehum Total Cooling Btuh 38,300 16,000 36,300 11,600 34,300 7,100 Sensible Btuh 26,700 4,600 25,800 1,300 24,800 (2,000) 0.697 0.29 0.711 0.11 0.723 Latent Btuh 11,600 11,400 10,500... -
Page 47: Q42A4D Cooling And Dehumidification Application Data
Q42A4D Cooling and Dehumidification Application Data OD Temp. 75°F 85°F 95°F DB/WB Mode Dehum Dehum Dehum Total Cooling Btuh 38,300 16,000 36,300 11,600 34,300 7,100 Sensible Btuh 26,700 4,600 25,800 1,300 24,800 (2,000) 0.697 .029 0.711 0.11 0.723 Latent Btuh 11,600 11,400 10,500... -
Page 48: Q48A4D Cooling And Dehumidification Application Data
Q48A4D Cooling and Dehumidification Application Data OD Temp. 75°F 85°F 95°F DB/WB Mode Dehum Dehum Dehum Total Cooling Btuh 49,500 17,800 46,700 13,700 43,600 8,000 Sensible Btuh 34,200 3,900 32,800 1,100 31,200 -3,200 0.691 0.219 0.702 0.080 0.716 Latent Btuh 15,300 13,900 13,900... -
Page 49: Table 15 Dehumidification Relay Logic Board
TABLE 15 Dehumidification Relay Logic Board Energize on Occupied/ Unit Terminal Mode Inputs to the Board Outputs from the Board Unoccupied Strip RV TWV Y1, G 1st Cooling Unoccupied Y1, G, A 1st Cooling Occupied 1st Cooling Y1, G, A, D Occupied w/Dehum ...
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