Start The Chiller-Heater; Stop The Chiller-Heater; Interlocking Procedure - York EX Series Installation, Operation & Maintenance Instructions Manual

FORM 155.32-ICOM1.EN.GB
ISSUE DATE: 10/13/2017

START THE CHILLER-HEATER

Before starting the chiller-heater, review the following:
• Check that the refrigerant blow valve (V8) is
closed.
• Check that the fuel gas supply valve is open.
• Check that the fuel gas supply pressure is kept at
its specification.
• Check that the Refrigerant Pump Auto button is
pressed.
After the review is complete, start the chiller-heater.
The OPER. and STOP buttons are avail-
able on the Main, Data, and Setting
screen. We recommend that you use them
on the Main screen whenever possible.
1. Navigate to the Main screen on the Control Panel.
2. Press the OPER. button on the Control Panel to
start the chiller-heater. To start the chiller-heater
from a remote location, enter the remote start sig-
nal.
When the chiller-heater starts, the following occurs:
• The solution circulation pump, solution spray
pump, and the refrigerant pump start.
• The burner fan starts.
• The ignition sequence starts.
• The Low Combustion lamp lights. The low open-
ing of the capacity control valves are held for
about 10 minutes.
• After 10 minutes, the capacity control valves are
controlled automatically according to the cooling
load. The Temp Control lamp lights.
JOHNSON CONTROLS

STOP THE CHILLER-HEATER

1. Press the STOP button on the Main screen of the
Control Panel. To stop the chiller-heater from a
remote location, enter the remote stop signal.
When the chiller-heater stops, the following occurs:
• The capacity control valves close.
• Combustion stops.
• The dilution operation starts. It continues for 7 -
30 minutes.
• During the dilution operation, the solution circu-
lation pump, the solution spray pump, and the re-
frigerant pump operate.
• Once the dilution operation is complete, the solu-
tion circulation pump, the solution spray pump,
and the refrigerant pump stop. Then, the chilled/
hot water pump, the cooling water pump, and the
cooling tower fan stop.

INTERLOCKING PROCEDURE

Operating the chiller-heater in cooling mode without
the air conditioner running can cause the chilled water
to freeze. If the unit contains only one air conditioner,
secure the air conditioner interlock.
SECTION 5 - COMMISSIONING
79
5