Bard CH3S1 START UP cont’d, safety practices, Important Installer Note, Pressure Service Ports

START UP cont’d.

safety practices:

1.Never mix R-410A with other refrigerants.

2.Use gloves and safety glasses, Polyol Ester oils can be irritating to the skin, and liquid refrigerant will freeze the skin.

3.Never use air and R-410A to leak check; the mixture may become flammable.

4.Do not inhale R-410A – the vapor attacks the nervous system, creating dizziness, loss of coordination and slurred speech. Cardiac irregularities, unconsciousness and ultimate death can result from breathing this concentration.

5.Do not burn R-410A. This decomposition produces hazardous vapors. Evacuate the area if exposed.

6.Use only cylinders rated DOT4BA/4BW 400.

7.Never fill cylinders over 80% of total capacity.

8.Store cylinders in a cool area, out of direct sunlight.

9.Never heat cylinders above 125°F.

10.Never trap liquid R-410A in manifold sets, gauge lines or cylinders. R-410A expands significantly at warmer temperatures. Once a cylinder or line is full of liquid, any further rise in temperature will cause it to burst.

IMPORTANT INSTALLER NOTE

For improved start-up performance, wash the indoor coil with a dish washing detergent.

PRESSURE SERVICE PORTS

R-410A requires high pressure hose connections and gauges. High and Low pressure service ports are installed on all units so that the system operating pressures can be observed. Pressure tables can be found later in the manual covering all models on both cooling and heating cycles. It is imperative to match the correct pressure table to the unit by model number.

HIGH & Low PRESSURE SWITCH

All models are supplied with a remote reset high and low pressure switch. If tripped, this pressure switch may be reset by turning the thermostat off then back on again.

High/Low Pressure control provides protection for the compressor. In the event system pressures go above 575 PSI or below 32 PSI, in either cooling or heating mode, the compressor will be stopped. This high pressure switch is located on the discharge line and is matched with Bard Part #8406-113. This will activate the “L” terminal of the low voltage terminal strip. This terminal can be used for remote indication of a pressure lockout. The lockout circuit will hold compressor off line. When the system problem is corrected, the unit operation can be restored by turning the main power supply off and then back on, or reset the room thermostat. The low pressure control has a bypass circuit built into the Defrost Control Board.

THREE PHASE SCROLL COMPRESSOR STart UP INFORMATION

Scroll compressors, like several other types of compressors, will only compress in one rotational direction. Direction of rotation is not an issue with single phase compressors since they will always start and run in the proper direction.

However, three phase compressors will rotate in either direction depending upon phasing of the power. Since there is a 50-50 chance of connecting power in such a way as to cause rotation in the reverse direction, verification of proper rotation must be made. All three phase units incorporate a phase monitor to ensure proper field wiring. See the “Phase Monitor” section later in this manual.

Verification of proper rotation must be made any time a compressor is changed or rewired. If improper rotation is corrected at this time there will be no negative impact on the durability of the compressor. However, reverse operation for over one hour may have a negative impact on the bearing due to oil pump out.

NOTE: If compressor is allowed to run in reverse rotation for several minutes, the compressor’s internal protector will trip.

All three phase ZR3 compressors are wired identically internally. As a result, once the correct phasing

is determined for a specific system or installation, connecting properly phased power leads to the same Fusite terminal should maintain proper rotation direction.

Verification of proper rotation direction is made by observing that suction pressure drops and discharge pressure rises when the compressor is energized. Reverse rotation also results in an elevated sound level over that with correct rotations, as well as substantially reduced current draw compared to tabulate values.

The direction of rotation of the compressor may be changed by reversing any two line connections to the unit.

Manual 2100-455M

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