Johnson Controls BQ 060, BQ 036, BQ 048 installation manual XIM-B-0508

Page 36

364985-XIM-B-0508

has energized when the fan switch is in the AUTO position, check the room thermostat for contact between R and G in the AUTO position during calls for cooling.

3.If the supply air blower motor does not energize when the fan switch is set to ON, check that line voltage is being supplied to the contacts of the M2, contactor, and that the contactor is pulled in. Check for loose wiring between the contactor and the sup- ply air blower motor.

4.If M2 is pulled in and voltage is supplied to M2, lightly touch the supply air blower motor housing. If it is hot, the motor may be off on internal protec- tion. Cancel any thermostat calls and set the fan switch to AUTO. Wait for the internal overload to reset. Test again when cool.

5.If M2 is not pulled in, check for 24 volts at the M2 coil. If 24 volts are present at M2 but M2 is not pulled in, replace the contactor.

6.Failing the above, if there is line voltage supplied at M2, M2 is pulled in, and the supply air blower motor still does not operate, replace the motor.

7.If 24 volts is not present at M2, check that 24 volts is present at the UCB supply air blower motor ter- minal, “FAN”. If 24 volts is present at the FAN, check for loose wiring between the UCB and M2.

8.If 24 volts is not present at the “FAN” terminal, check for 24 volts from the room thermostat. If 24 volts are not present from the room thermostat, check for the following:

a.Proper operation of the room thermostat (contact between R and G with the fan switch in the ON posi- tion and in the AUTO position during operation calls).

b.Proper wiring between the room thermostat and the UCB.

c.Loose wiring from the room thermostat to the UCB.

9.If 24 volts is present at the room thermostat but not at the UCB, check for proper wiring between the thermostat and the UCB, i.e. that the thermostat G terminal is connected to the G terminal of the UCB, and for loose wiring.

10.If the thermostat and UCB are properly wired, replace the UCB.

On a call for cooling, the supply air blower motor is operating but the compressor is not (the room thermo- stat fan switch is in the “AUTO” position).

1.If installed, check the position of the economizer blades. If the blades are open, the economizer is

providing free cooling and the compressors will not immediately operate. If both stages of cooling are requested simultaneously and the economizer pro- vides free cooling, following a short delay the com- pressor will be energized unless it is locked out, unless this option has been disabled through com- puter communications.

2.If no economizer is installed or the economizer is not opening to provide free cooling and the compressor does not energize on a call for cooling, check for line voltage at the compressor contactor, M1, and that the contactor is pulled in. Check for loose wiring between the contactor and the compressor.

3.If M1 is pulled in and voltage is supplied at M1, lightly touch the compressor housing. If it is hot, the compressor may be off on inherent protection. Cancel any calls for cooling and wait for the inter- nal overload to reset. Test again when cool.

4.If M1 is not pulled in, check for 24 volts at the M1 coil. If 24 volts are present and M1 is not pulled in, replace the contactor.

5.Failing the above, if voltage is supplied at M1, M1 is pulled in, and the compressor still does not oper- ate, replace the compressor.

6.If 24 volts is not present at M1, check for 24 volts at the UCB terminal, C1. If 24 volts is present, check for loose wiring between C1 and the compressor contactor.

7.If 24 volts is not present at the C1 terminal, check for 24 volts from the room thermostat at the UCB Y1 terminal. If 24 volts is not present from the room thermostat, check for the following:

a.24 volts at the thermostat Y1 terminal

b.Proper wiring between the room thermostat and the UCB, i.e. Y1 to Y1, Y2 to Y2

c.Loose wiring from the room thermostat to the UCB.

8.If 24 volts is present at the UCB Y1 terminal, the compressor may be out due to an open high-pres- sure switch, low-pressure switch, or freezestat. Check for 24 volts at the HPS1, LPS1, and FS1 terminals of the UCB. If a switch has opened, there should be a voltage potential between the UCB ter- minals, e.g. if LPS1 has opened, there will be a 24- volt potential between the LPS1 terminals.

9.If 24 volts is present at the UCB Y1 terminal and none of the protection switches have opened, the UCB may have locked out the compressor for repeat trips. The UCB should be flashing an alarm code. If not, press and release the ALARMS button on the UCB.

36

Johnson Controls Unitary Products

Page 35 Page 37
Image 36
Page 35 Page 37
Contents Installation Table of Contents List of Figures List of TablesSafety Considerations GeneralInspection ReferenceProduct Nomenclature Ton Sunline Simplicity Model Number NomenclatureInstallation Installation Safety InformationLimitations Unit Application Data BQRigging and Handling ClearancesDuctwork Condensate DrainService Access CompressorsFilters Typical Power Wiring Power and Control Wiring Control Wire SizesOPTIONS/ACCESSORIES ThermostatElectric Heater CFM Limitations Minimum Position Adjustment Enthalpy Setpoint Adjustment BQ 4 Point Loads Weight Distribution BQ 6 Point Loads Weight DistributionOperating Weights LBS Physical DataMCA Pwr Max Size Motors Fuse XIM-B-0508 Pwr Max MCA1 Electric Heat Correction Factors Voltage LIMITATIONS1Unit with Economizer Rainhood Unit Dimensions Rear View Minimum ClearancesRPM BHP BHP RPM BHP Belt Drive RPM Selection Belt Drive Blower Motor and Drive DataStatic Resistances Drive Selection Factor Phasing Supply AIR BlowersChecking Supply AIR CFM Operation Sequence of Operations OverviewCooling Sequence of Operation Cooling Operation Errors Safety Controls ResetCompressor Protection Flash CodesElectric Heat Limit Control Setting Heat Anticipator SetpointsTroubleshooting START-UP CoolingXIM-B-0508 Unit Flash Codes Unit Control Board Flash CodesMaintenance Normal MaintenanceMotors Outdoor CoilXIM-B-0508 Johnson Controls Unitary Products Johnson Controls Unitary Products York Drive Norman, OK

BQ 048, BQ 036, BQ 060 specifications

Johnson Controls has established itself as a leading player in the HVAC and building management industries, and its BQ series of chillers - including the BQ 060, BQ 036, and BQ 048 - reflects this commitment to innovation and efficiency. These models are designed to provide advanced cooling solutions suitable for a variety of commercial applications.

The BQ 060 is particularly notable for its high-performance capabilities. With a cooling capacity of 60 tons, it utilizes variable-speed compressors, allowing it to adjust its performance based on the cooling demand. This flexibility not only enhances energy efficiency but also reduces operational costs. The unit incorporates advanced microprocessor controls that facilitate seamless integration with building management systems, enabling real-time monitoring and adjustments.

Moving on to the BQ 036, this model is engineered for facilities that require a smaller footprint but still demand reliability and efficiency. With a cooling capacity of 36 tons, it features a compact design without compromising on performance. The BQ 036 also employs environmentally friendly refrigerants, aligning with Johnson Controls' commitment to sustainability. Enhanced insulation and sound-dampening technologies make it an ideal choice for noise-sensitive environments, ensuring comfort without sacrificing efficiency.

The BQ 048 lies in between the two, with a capacity of 48 tons, making it versatile for medium-sized commercial buildings. Its design incorporates a modular approach, allowing for easy scalability in future expansions. This model also features energy recovery options that can utilize excess heat to improve overall efficiency, further solidifying its role in sustainable building practices. Its user-friendly interface enhances operability, simplifying management for building operators.

All three models of the BQ series share key characteristics, such as robust construction to withstand diverse environmental conditions, and low maintenance requirements thanks to their durable components. They utilize advanced technologies for temperature control and energy efficiency, including an intelligent controller that automates more routine tasks. Together, the BQ 060, BQ 036, and BQ 048 offer comprehensive solutions that cater to the growing demands of energy efficiency, sustainability, and reliability in modern building operations. With these chillers, Johnson Controls continues to lead the way in shaping the future of HVAC solutions.
Top Page Image Contents