Wiring LOW Voltage Wiring, Thermostat Wire Size

WIRING – LOW VOLTAGE WIRING

230/208V, 1 phase and 3 phase equipment dual primary voltage transformers. All equipment leaves the factory wired on 240V tap. For 208V operation, reconnect from 240V to 208V tap. The acceptable operating voltage range for the 240 and 208V taps are:

TAP	RANGE
240	253	- 216
208	220	- 187

NOTE: The voltage should be measured at the field power connection point in the unit and while the unit is operating at full load (maximum amperage operating condition).

Nine (9) wires should be run from thermostat subbase to the 24V terminal board in the unit. A nine conductor, 18 gauge copper, color-coded thermostat cable is recommended.. The connection points are shown in Figure 7.

TABLE 3

THERMOSTAT WIRE SIZE

			Maximum
Transformer			Distance
VA	FLA	Wire Gauge	In Feet

55	2.3	20 gauge	45
		18 gauge	60
		16 gauge	100
		14 gauge	160
		12 gauge	250

COMPRESSOR CUTOFF THERMOSTAT AND OUTDOOR THERMOSTATS

Heat pump compressor operation at outdoor temperatures below 0° F are neither desirable not advantageous in terms of efficiency. Since most equipment at time of manufacture is not designated for any specific destination of the country and most of the equipment is installed in areas not approaching the lower outdoor temperature range, the compressor cutoffs are not factory installed.

Outdoor thermostats are available to hold off various banks of electric heat until needed as determined by outdoor temperature. The set point of either type of thermostat is variable with geographic region and sizing of the heating equipment to the structure. Utilization of the Heating Application Data and the heat loss calculation of the building are useful in determining the correct set points.

See Figure 8 for compressor cutoff and outdoor thermostat wiring.

FIGURE 8 – COMPRESSOR CUTOFF AND OUTDOOR THERMOSTAT WIRING

4 & 8 KW 1 Phase – 6 KW 3 Phase

MIS-409

Manual 2100-373

Page 11

WH183, WH242 specifications

The Bard WH242 and WH183 are innovative heating and cooling systems designed to meet the demands of various residential and commercial applications. These units are recognized for their efficiency, reliability, and advanced technologies, making them popular choices among property owners and HVAC professionals.

The Bard WH242 is a high-capacity unit that delivers optimal temperature control, making it ideal for larger spaces. It boasts a robust design and a powerful compressor, which work together to provide consistent heating and cooling throughout the year. The unit features a multi-speed blower, helping to distribute air evenly while also enhancing comfort levels. Energy efficiency is a key highlight, as the WH242 complies with Energy Star standards, which means it consumes less energy while offering high performance.

On the other hand, the Bard WH183 is designed for smaller spaces without compromising on comfort or efficiency. It incorporates a compact design, making it easier to install in tight spaces. Despite its size, the WH183 is equipped with advanced technologies that ensure reliable operation. Like the WH242, this unit also features a multi-speed blower, which aids in maintaining a steady and comfortable indoor climate.

Both models utilize high-quality insulation and advanced refrigerant management systems that minimize energy loss. The systems are also equipped with advanced diagnostics, allowing for easier maintenance and troubleshooting. This means that HVAC technicians can quickly identify potential issues, ensuring that the units remain operational with minimal downtime.

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