York B1CH240 Cooling System, Preliminary Operation Cooling, Cooling Sequence of Operation

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511.06-N3Y

OPERATION

COOLING SYSTEM

The unit has an air-cooled cooling section and is factory-charged with Refrigerant-22.

The compressors are hermetically sealed, internally sprung and base-mounted with rubber-insulated hold-down bolts.

Compressors have inherent (internal) protection. If there is an abnormal temperature rise in a compressor, the protector will open to shut down the compressor.

PRELIMINARY OPERATION COOLING

After installation has been completed, energize the crankcase heaters for at least four hours before operating the unit. After the initial installation, the compressors should be given three false starts (energized just long enough to make a few revolutions) with 5-7 minutes delay between each start, before being put into full time service.

NOTE: Prior to each cooling season, the crankcase heaters must be energized at least 8 hours before system is put into operation.

COOLING SEQUENCE OF OPERATION

NO OUTDOOR AIR OPTIONS - When the room thermostat calls for "first-stage" cooling, the low voltage control circuit from "R" to "G" and "Y1" is completed to energize compressor #1, outdoor fan motor #1, outdoor fan motor #2 (if the ambient temperature is above 60° F), and the supply air blower motor (if the fan switch on the room thermostat is set in the "AUTO" position).

When the thermostat calls for "second-stage" cooling, the low voltage control circuit from "R" to "Y2" is completed to energize compressor #2.

After the thermostat is satisfied and opens, all components will stop simultaneously. The blower motor will continue to operate if the fan switch on the room thermostat is set in the "ON" position.

The reversing valve is energized thru the "Y1" circuit when the subbase is in the cooling mode.

The suction line freezestat will cut the compressors out when the suction line temperature drops below 26° F. This is and automatic reset device.

ECONOMIZER WITH SINGLE ENTHALPY SENSOR - When the room thermostat calls for "first-stage" cooling, the low voltage control circuit from "R" to "G" and "Y1" is completed. The "R" to "G" circuit energizes the blower motor (if the fan switch on the room thermostat is set in the "AUTO" position) and drives the economizer dampers from fully closed to their minimum position. If the enthalpy of the outdoor air is below the setpoint of the enthalpy controller (previously determined), "Y1" energizes the economizer. The dampers will modulate to maintain a constant supply air temperature as monitored by the discharge air sensor. If the outdoor air enthalpy is above the

setpoint, "Y1" energizes compressor #1, outdoor fan motor #1, and outdoor fan motor #2 (if the ambient temperature is above 60° F).

When the thermostat calls for "second-stage" cooling, the low voltage control circuit from "R" to "Y2" is completed. If the enthalpy of the outdoor air is below the setpoint of the enthalpy controller (i.e. first stage has energized the economizer), "Y2" will energize compressor #1. If the outdoor air is above the setpoint, "Y2" will energize compressor #2.

After the thermostat is satisfied and opens, all components will stop simultaneously. The blower motor will continue to operate if the fan switch on the room thermostat is set in the "ON" position.

ECONOMIZER WITH DUAL ENTHALPY SENSORS - The operation with the dual enthalpy sensors is identical to the single sensor except that a second enthalpy sensor is mounted in the return air. This return air sensor allows the economizer to choose between outdoor air and return air, whichever has the lowest enthalpy value, to provide maximum operating efficiency.

ECONOMIZER (SINGLE OR DUAL) WITH POWER EXHAUST - This system operates as specified above with one addition. The power exhaust motor is energized whenever the economizer is chosen by the enthalpy sensor for first stage cooling, "Y1". As always, the "R" to "G" connection provides minimum position but does not provide power exhaust operation.

MOTORIZED OUTDOOR AIR DAMPERS - This system operation is the same as the units with no outdoor air options with one exception. When the "R" to "G" circuit is complete, the motorized damper drives open to a position set by the thumbwheel on the damper motor. When the "R" to "G" circuit is opened, the damper spring returns fully closed.

HEATING SEQUENCE OF OPERATION

The following sequence of operation is based on using a standard heat pump two-stage heating/two-stage cooling thermostat/subbase. Economizer (if supplied) operation is not allowed in the heating mode - however the minimum position does operate.

FIRST STAGE HEAT

When the thermostat calls for “heating”, the low voltage control circuit from “R” to “G” and “W1" (wiring schematic) is completed to energize the compressors, outdoor fan motors and blower motor (if subbase is set on auto) simultaneously. If the subbase has the indoor fan set on ”on" the motor will run all of the time.

SECOND STAGE HEAT

If the compressors alone can not satisfy the heating requirements, second stage heat will energize all the electric heat (if supplied) thru the “W2" circuit.

Unitary Products Group

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Contents Sunline 2000 Single Package Heat Pumps Table of Contents Installation Condensate Drain Service AccessPower and Control Wiring Fixed Outdoor AIR Intake DamperControl Wire Sizes Typical Field WiringElectric Heat Application Data Power EXHAUST/BAROMETRIC Relief Damper and Rain Hood OptionEnthalpy SET Point Adjustment Optional Electric HeatersEnthalpy Setpoint Adjustment Physical Data Utilities Entry Data Return AIR Supply AIR Outdoor AIROpening Hole Size Used for Unit Point Loads LBS Point LoadsSpeed Turns RPM ESP BHP Open Blower Motor CFM PulleySpeed RPM Turns ESP BHP Open Power Exhaust Performance Static ResistancesBlower Motor and Drive Data Fuse Size Electrical Data Basic UnitsMotor Supply Fuse Size FLA RLA LRA Amps EachCooling Sequence of Operation OperationCooling System Preliminary Operation CoolingChecking Supply AIR CFM Heat Anticipator SettingHeater Voltage SETTING, Amps TH1 TH2 Heat Anticipator SetpointsLockout Control Defrost Sequence of OperationMotors MaintenanceNormal Maintenance T2 80 Minute Setting T3 110 Minute Setting511.06-N3Y Unitary Products Group

B1CH240, B1CH180 specifications

The York B1CH240 and B1CH180 are two prominent models in the commercial HVAC (Heating, Ventilation, and Air Conditioning) sector, known for their efficiency and reliability in demanding environments. Both units are designed with the latest technologies to provide optimal climate control, making them suitable for a variety of applications including offices, retail spaces, and industrial environments.

One of the main features of the York B1CH series is its high energy efficiency. These models are equipped with advanced inverter technology, allowing them to adjust their cooling and heating output based on the current demand. This not only minimizes energy consumption but also reduces operating costs, making them an environmentally friendly choice. The units also meet or exceed industry standards for energy efficiency, complying with stringent regulations set forth by organizations such as ASHRAE and ENERGY STAR.

Another key characteristic of the B1CH240 and B1CH180 is their adaptability. These units come with customizable settings and programmable controls, enabling users to optimize performance based on specific needs. Whether it is cooling an entire building or maintaining comfortable temperatures in different zones, the B1CH series can be tailored to fit the unique demands of any space.

In terms of technology, York has integrated advanced refrigerant management into the B1CH series. The units utilize R-410A refrigerant, which not only enhances cooling efficiency but also minimizes environmental impact. This refrigerant is known for its higher performance and lower toxicity compared to traditional options, aligning with global efforts to reduce ozone depletion.

Durability is another hallmark of the York B1CH240 and B1CH180 models. Constructed from high-quality materials, these units are designed to withstand the rigors of everyday use while maintaining peak performance. The units are also equipped with comprehensive diagnostic and monitoring systems that alert users to any potential issues before they escalate, ensuring uninterrupted operation and reducing maintenance downtime.

Moreover, the B1CH series features a quiet operation mode, making them ideal for noise-sensitive environments. The design incorporates sound-dampening materials and efficient airflow dynamics to ensure that the units operate at a low noise level while providing powerful heating and cooling.

In summary, the York B1CH240 and B1CH180 models stand out in the HVAC market for their energy efficiency, adaptability, advanced refrigerant management, durability, and quiet operation. Together, these features make them an excellent choice for businesses seeking reliable and cost-effective climate control solutions. Whether for new construction or retrofitting existing spaces, these units are poised to meet the diverse needs of commercial and industrial applications.
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