Johnson Controls York YHAU-C, Installation, Operation And Maintenance Manual

Page: 29 / 180

Electrical
The electrical work must be performed in accordance with the wiring diagrams, delivery
specifications, and technical standards for electrical equipment found in Technical data . Use the
specified cables to complete the wiring, and fasten them to the according terminals securely. Loose
fitting cables can cause the terminals to heat up, resulting in fire or electrical shock.
CAUTION
The chiller does NOT arrive with a ground fault (earth leakage) circuit breaker installed. Be sure to have
the customer install one at the primary side of the unit.
Electrical work must be supervised or completed by a Johnson Controls Service Representative.
Precautions for use
A caution label for a rotating object is pasted around the belt cover of the vacuum pump. When
replacing the oil in the vacuum pump, belt, or performing maintenance work, stop the chiller and
be sure to turn off the main circuit breaker (MCCB) and lockout or tagout the unit. Otherwise, the
vacuum pump could start abruptly and cause injury or damage to the unit.
Do not place heavy objects on the machine or its control panel; it can fall and injure a worker.
Do not climb up the machine without safety harnessing.
Contact your local Johnson Controls service office for inspection and maintenance of the machine.
Improper inspection and maintenance can cause a machine problem and also injure workers.
Keep the chilled water, cooling water, and steam under the maximum usage pressure. If levels
exceed the maximum usage pressure, they can spout, leak, or cause an electric leak and a burn.
Do not change the set values of the safety devices and protective devices. Operation with incorrect
set values can cause a problem.
The shut off valve for the pressure release valve must remain open except during servicing. Do not
operate the unit with the shut off valve closed.
A caution label for high temperature is pasted at the control panel, solution pump, and vacuum
pump. Do not touch the pump during pump operation; it can cause a burn.
Wear protective gloves and goggles when operating the control valve, or other parts of the chiller.
CAUTION
During service and maintenance work, be sure to turn OFF the main circuit breaker (MCCB) and follow
all required Lockout/Tagout procedures. Fully close the main valve to prevent electric shock and burn.
If the cables of the solution pump, refrigerant pump, or vacuum pump are disconnected for service
and maintenance work, check the rotating direction of the pump motor. If not, the chiller can
malfunction. When changing the oil of the vacuum pump, stop the purge operation.
In case of an accident, use the emergency stop device (external handle of MCCB) to stop the chiller
immediately.
27 YHAU-C Single Effect Steam-Fired Absorption Chiller