INSTALLATION INSTRUCTIONS QTEC SERIES PACKAGED HEAT PUMP Models: QH243 QH302 QH362 QH422 QH482 QH602 MIS-1554 Bard Manufacturing Company Bryan, Ohio 43506 Since 1914 . . . Moving ahead, just as planned.
CONTENTS Getting Other Information and Publications For more information, contact these publishers: .......... 1 QTEC General Information QTEC Model Nomenclature .......................................... 2 Shipping Damage ......................................................... 6 Unit Removal From Skid .............................................. 6 Handling Unit After Removal From Skid ....................... 7 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 - 2-1/2 Ton 36 - 3 Ton 42 - 3-1/2 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 INT
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.
Manual 2100-420 Page 5 FIGURE 1 UNIT DIMENSIONS
FIGURE 2 AIR SEAL UNDER QTEC UNIT 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. 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 CEILING 8 FT. - 6 IN. MINIMUM RECOMMENDED CEILING HEIGHT 8 FT. - 5 IN. MIS-1574 FLOOR FIGURE 6 DUCTED APPLICATION 20 IN. MINIMUM SUSPENDED CEILING FIXED CEILING DUCT DUCT FLANGE 12 IN. MINIMUM 2 IN. MINIMUM FROM DUCT FLANGE TO DUCT BOTTOM 7 FT. - 4 IN. UNIT HEIGHT 8 FT. - 7 IN. MINIMUM RECOMMENDED CEILING HEIGHT 8 FT. - 4.5 IN.
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 air flow 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 air flow. The Damper blade will now open when the indoor blower is operating.
SERVICE LIGHT FIGURE 11 REAR DRAIN (TOP VIEW) 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 AND SUBBASE COMBINATIONS Thermostat S u b b ase Predominant Features 8407-017 (T874R1129) 8404-009 Heat or Cool (Q674L1181) No Auto 8403-018 (T874N2024) 8404-010 Automatic Heat / Cool (Q6741261) Changeover Position 8403-049 (1F93-380) N/A Manual / Auto / Heat / Cool Programmable 8403-042 (T8511G1070) N/A Manual / Auto / Heat / Cool Non-Programmable Electronic FIGURE 15 THERMOSTAT PLUG TERMINALS P2 AND P4 (VIEWED FROM PIN END) BLOWER MOTOR LOW VOLTAGE PLUG (VIEWED FROM
FIGURE 16 REMOTE THERMOSTAT WIRING DIAGRAM “X” THERMOSTAT OPTION 24VAC HOT COMPRESSOR REVERSING VALVE 2ND STAGE HEAT BLOWER EMERGENCY HEAT 24VAC COMMON VENTILATOR OR DAMPER NOTE: On option X or A the CS2000 (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 CS2000 (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 4102-022C Manual 2100-420 Page 18
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 air flow 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 QTEC R ENERGY RECOVERY VENTILATOR (Option) BAROMETRIC FRESH AIR DAMPER (Standard) 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. To gain access to the mist eliminator, the QERV must be removed. See Figure 20. Before starting, make sure the power has been turned off. The return air grille panel must be removed.
FIGURE 19 FRESH AIR DAMPER REMOVAL MOUNTING SCREW MIS-1627 Manual 2100-420 Page 22
FIGURE 20 QERV REMOVAL POWER CONNECTORS MOUNTING SCREWS LOWER BLOWER ASSEMBLY POWER CONNECTOR FRONT FILL MIS-1039 Manual 2100-420 Page 23
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 reversing valve controls heating cycle operation.
DEFROST CYCLE The defrost cycle is controlled by temperature and time on the solid state heat pump control. (Refer to Figure 19.) 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 Sympton Compressor contactor does not energize (cooling or heating) Fan outdoor motor does not run (cooling or heating except during defrost) Reversing valve does not energize (heating only) Unit will not go into defrost (heating only) Unit will not come out of defrost (heating only) Manual 2100-420 Page 26 Possible Cause What to Check How to Check or Repair Control circuit wiring Check for R connection at unit, and Run R connection to outdoor unit to 24V be
SOLID STATE HEAT PUMP CONTROL TROUBLESHOOTING PROCEDURE CHECKING TEMPERATURE SENSOR 1. Disconnect temperature sensor from board and from outdoor coil. 1. Turn on AC power supply to indoor and outdoor units. 2. Use an ohmmeter and measure the resistance of the sensor. Also use ohmmeter to check for short or open. 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.
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.
