QTEC SERIES PACKAGED HEAT PUMP INSTALLATION INSTRUCTIONS Models: QH243 QH302 QH362 QH422 QH482 QH602 Bard Manufacturing Company, Inc. Bryan, Ohio 43506 Since 1914 . . . Moving ahead, just as planned.
CONTENTS Getting Other Information and Publications For more information, contact these publishers: .......... 3 QTEC General Information QTEC Model Nomenclature .......................................... 4 Shipping Damage ......................................................... 8 Unit Removal From Skid .............................................. 8 Handling Unit After Removal From Skid ....................... 9 General .........................................................................
GETTING OTHER INFORMATION AND PUBLICATIONS These publications can help you install the air conditioner or heat pump. You can usually find these at your local library or purchase them directly from the publisher. Be sure to consult current edition of each standard.
QTEC Series General Information QTEC MODEL NOMENCLATURE QH 36 2 – A MODEL NUMBER | QH - QTEC Model CAPACITY | 24 - 2 Ton 30 - 2½ Ton 36 - 3 Ton 42 - 3½ Ton 48 - 4 Ton 60 - 5 Ton REVISION | SPECIAL UNITS | L - Low Ampacity Circuit VOLTS & PHASE | A - 230/208/60/1 B - 230/208/60/3 C - 460/60/3 10 X KW 0Z - 0KW 05 - 5KW 06 - 6KW 09 - 9KW 10 - 10KW 12 - 12KW 15 - 15KW X X X FILTER OPTIONS X - 1-Inch Fiberglass (Standard) F - 2-Inch Fiberglass P - 2-Inch Pleated X COIL OPTIONS X - Standard INTERNAL
TABLE 2 ELECTRICAL SPECIFICATIONS SINGLE CIRCUIT 3 MODELS RATED VOLTS & PHASES 1 DUAL CIRCUIT 2 3 2 2 1 MINIMUM MAXIMUM CIRCUIT EXTERNAL FIELD AMPACITY NO.
TABLE 2A ELECTRICAL SPECIFICATIONS (Continued) SINGLE CIRCUIT 3 MODEL RATED VOLTS & PHASE 1 DUAL CIRCUIT 2 MAXIMUM NO.
FIGURE 1 UNIT DIMENSIONS Manual Page 2100-420H 7 of 34
SHIPPING DAMAGE Upon receipt of equipment, the carton should be checked for external signs of shipping damage. The skid must remain attached to the unit until the unit is ready for installation. If damage is found, the receiving party must contact the last carrier immediately, preferably in writing, requesting inspection by the carrier’s agent. FIGURE 2 AIR SEAL UNDER QTEC UNIT UNIT REMOVAL FROM SKID WARNING This unit is heavy and requires more than one person to handle and remove from the skid.
HANDLING UNIT AFTER REMOVAL FROM SKID WARNING Exercise extreme caution when pushing the unit on the rollers. Handle and push from the lower 1/3 of the unit. Insure that debris is not on the floor where the unit is to be moved on the rollers. Failure to do so could result in the unit tipping over and causing bodily injury and/ or damage to the unit. The unit will have to be turned sideways and removed from the skid to fit through a 36" doorway.
FIGURE 5 INSTALLATION WITH FREE BLOW PLENUM FIGURE 6 DUCTED APPLICATION Manual 2100-420H Page 10 of 34
DUCT WORK Any heat pump is more critical of proper operating charge and an adequate duct system than a straight air conditioning unit. All duct work must be properly sized for the design airflow requirement of the equipment. Air Conditioning Contractors of America (ACCA) is an excellent guide to proper sizing. All duct work or portions thereof not in the conditioned space should be properly insulated in order to both conserve energy and prevent condensation or moisture damage.
FRESH AIR INTAKE CONDENSATE DRAIN This unit is equipped with a fresh air damper assembly. The damper blade is locked in the closed position when the unit is shipped from the Factory. To allow the damper to operate remove the two plastic locking pins, one on each end of the blade. This will allow for maximum fresh airflow. The damper blade will now open when the indoor blower is operating.
FIGURE 11 REAR DRAIN (TOP VIEW) SERVICE LIGHT The unit is equipped with a service light which signals the user that service is required. The light is located in the upper control panel and is visible only when the hinged service/filter access door is open. DRAIN LINE WALL (MAXIMUM 10" FOR REAR DRAIN) SLEEVE The Service Unit light indicates that the unit has been shut off by a high or low pressure device. This indicates that the unit needs to be serviced.
INSTALLATION INSTRUCTIONS MOUNTING THE UNIT When installing a QTEC unit near an interior wall on the left side, a minimum of 8 inches is required; 12 inches is preferred. When installing a QTEC unit near an interior wall on the right side, a minimum of 18 inches is required as additional space is required to connect the side drain. If the rear condensate drain kit QCDS48 is used the minimum can be reduced to 8 inches.
WIRING – MAIN POWER Refer to the unit rating plate and/or Table 2 for wire sizing information and maximum fuse or “HACR Type” circuit breaker size. Each unit is marked with a “Minimum Circuit Ampacity”. This means that the field wiring used must be sized to carry that amount of current. Depending on the installed KW of electric heat, there may be two field power circuits required. If this is the case, the unit serial plate will so indicate. All models are suitable only for connection with copper wire.
LOW VOLTAGE CONNECTIONS These units use a grounded 24 volt AC low voltage circuit. The “R” terminal is the hot terminal and the “C” terminal is grounded. “G” terminal or pins 6 and 1 of P2 are the fan inputs. Both must be energized for proper fan operation. This is done automatically in the factory installed climate control options. If the climate control option is abandoned and connections are made directly to P2 both pins 6 and 1 of P2 must be energized for proper operation.
TABLE 4 WALL THERMOSTATS Thermostat Predominant Features 8403-060 (1120-445) 3 stage Cool; 3 stage Heat Programmable/Non-Programmable Electronic HP or Conventional Auto or Manual changeover 2 stage Cool; 2 stage Heat 8403-058 Electronic Non-Programmable (TH5220D1151) Auto or Manual changeover FIGURE 15 MIS-1285 Manual Page 2100-420H 17 of 34
FIGURE 16 REMOTE THERMOSTAT WIRING DIAGRAM “X” THERMOSTAT OPTION VENTILATOR OR DAMPER NOTE: On option X or A the CS2000A1 (or other field provided means to control ventilation) must be used if any of the motorized ventilation options are installed.
FIGURE 17 UNIT MOUNTED THERMOSTAT WIRING DIAGRAM “A” THERMOSTAT OPTION NOTE: On option X or A the CS2000A1 (or other field provided means to control ventilation) must be used if any of the motorized ventilation options are installed.
FIGURE 18 UNIT MOUNTED THERMOSTAT WIRING DIAGRAM “D” THERMOSTAT OPTION Manual 2100-420H Page 20 of 34
START UP DESCRIPTION OF STANDARD EQUIPMENT Solid State Electronic Heat Pump Control Provides efficient 30-minute defrost cycle. A thermistor sensor and speed up terminal for service along with a 10- minute defrost override are standard on the electronic heat pump control. High / Low Pressure Switch Provides refrigerant circuit high pressure and loss of charge protection. Includes lockout circuit that is resettable from room thermostat.
SERVICE HINTS 1. Caution user to maintain clean air filters at all times. Also, not to needlessly close off supply air registers. This may reduce airflow through the system, which shortens equipment service life as well as increasing operating costs and noise levels. 2. Switching to heating cycle at 75°F or higher outside temperature may cause a nuisance trip of the remote reset high pressure switch. Turn thermostat off, then on to reset the high pressure switch. 3.
VENT OPTIONS BAROMETRIC FRESH AIR DAMPER (Standard) Before starting, make sure the power has been turned off. The return air grille panel must be removed. The fresh air damper assembly can be seen on the back of the unit. See Figure 19. QTEC R ENERGY RECOVERY VENTILATOR (Option) Before starting, make sure that the power has been turned off. The return air grille panel must be removed. The energy recovery ventilator (QERV) can be seen after the panel has been removed.
FIGURE 19 FRESH AIR DAMPER REMOVAL MOUNTING SCREW Manual 2100-420H Page 24 of 34
FIGURE 20 QERV REMOVAL POWER CONNECTORS MOUNTING SCREWS LOWER BLOWER ASSEMBLY POWER CONNECTOR FRONT FILL Manual Page 2100-420H 25 of 34
SEQUENCE OF OPERATION Cooling – Circuit R-Y makes the thermostat pull in the compressor contactor starting the compressor and outdoor motor. The G (indoor motor) circuit is automatically completed on any call for cooling operation, or can be energized by manual fan switch on subbase for constant air circulation. Heating – A 24V solenoid coil on the reversing valve controls heating cycle operation.
DEFROST CYCLE The defrost cycle is controlled by temperature and time on the solid state heat pump control. When the outdoor temperature is in the lower 40°F temperature range or colder, the outdoor coil temperature is 32°F or below. This coil temperature is sensed by the coil sensor mounted near the bottom of the outdoor coil. Once coil temperature reaches 30°F or below, the coil sends a signal to the control logic of the heat pump control and the defrost timer will start.
TROUBLESHOOTING TABLE 5 TROUBLESHOOTING Symptom Compressor will not start (heating or cooling) Possible Causes Check for 24V from R to C on the heat pump control What & How to Check / Repair If 24V is not present at R, check wiring from board to transformer and check transformer input and output voltage. If transformer has no 24V output, determine cause and replace transformer.
SOLID STATE HEAT PUMP CONTROL TROUBLESHOOTING PROCEDURE 1. NOTE: A thorough understanding of the defrost cycle sequence is essential. Review that section earlier in this manual prior to troubleshooting the control. Turn on AC power supply to unit. 2. Turn thermostat blower switch to “fan on” – the indoor blower should start. (If it doesn’t, troubleshoot indoor unit and correct problem.) 3. Turn thermostat blower to “auto” position. Indoor blower should stop.
TROUBLESHOOTING GE ECM™ MOTORS CAUTION: Disconnect power from unit before removing or replacing connectors, or servicing motor. To avoid electric shock from the motor’s capacitors, disconnect power and wait at least 5 minutes before opening motor. Symptom Cause/Procedure • Noisy blower or cabinet • Check for loose blower housing, panels, etc.
TROUBLESHOOTING GE ECM™ MOTORS CONT’D. Replacing ECM Control Module To replace the control module for the GE variable-speed indoor blower motor you need to take the following steps: 1. You MUST have the correct replacement module. The controls are factory programmed for specific operating modes. Even though they look alike, different modules may have completely different functionality. USING THE WRONG CONTROL MODULE VOIDS ALL PRODUCT WARRANTIES AND MAY PRODUCE UNEXPECTED RESULTS. 2.
FAN BLADE SETTING DIMENSIONS REFRIGERANT CHARGE Any service work requiring removal or adjustment in the fan and/or motor area will require that the dimensions in Table 7 be checked and blade adjusted in or out of the motor shaft accordingly. The correct system R-22 charge is shown on the unit rating plate. Optimum unit cooling performance will occur with a refrigerant charge resulting in a Super Heat as shown in Table 8.
TABLE 10 COOLING PRESSURE (ALL TEMPERATURES IN DEGREES F) MODEL QH243 QH302 QH362 QH422 QH482 QH602 R E TU R N AIR TEMP.
TABLE 11 HEATING PRESSURE (ALL TEMPERATURES IN DEGREES F) MODEL R E TU R N AIR TEMP.