Chilled/Hot Water Outlet Temperature Controller; Liquid Level Gauges; Start The Chiller-Heater; Table 30 - Liquid Level Gauges (Sight Glass) - York YHAU-CGN Installation Operation & Maintenance

FORM 155.32-ICOM2.EN.UL
ISSUE DATE:1/10/2018

CHILLED/HOT WATER OUTLET TEMPERATURE CONTROLLER

The chilled/hot water outlet temperature controller (23A) is located on the sequencer and
controls the chilled/hot water outlet temperature.

LIQUID LEVEL GAUGES

Liquid level gauges are used to check the conditions of the chiller-heater components.

Table 30 - Liquid Level Gauges (Sight Glass)

LIQUID LEVEL GAUGE NAME
Refrigerant overflow monitoring level
gauge
Refrigerant tank level gauge
Absorber level gauge
HT-GEN level gauge
LT-GEN level gauge

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 the required specification.
• Check that the Refrigerant Pump Auto button is pressed.
After the review is complete, start the chiller-heater.
NOTE: The OPER. and STOP buttons are available 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 signal.
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 opening 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
SYMBOL
G101 Checks refrigerant overflow level
G102 Checks lower limit of refrigerant tank level
G103 Checks lower limit of absorber
Checks condition of solution in high-temperature
G104
generator
Checks condition of solution in low-temperature
G105
generator
FUNCTION
SECTION 5 - COMMISSIONING
85