First Time Start-Up - York YCIV0157 Installation Operation & Maintenance

Air-cooled screw liquid chillers

Table of Contents

Section 5 - Commissioning

Grounding

Verify that the unit's protective ground terminal(s) are

properly connected to a suitable grounding point. En-

sure that all unit internal ground connections are tight.

Water system

Verify the chilled liquid system has been installed cor-

rectly, and has been commissioned with the correct

direction of water flow through the cooler. The inlet

should be at the refrigerant piping connection end of

the cooler. Purge air from the top of the cooler using

the plugged air vent mounted on the top of the cooler

body.

Flow rates and pressure drops must be within the limits

given in Section 6 - Technical data. Operation outside

of these limits is undesirable and could cause damage.

If mains power must be switched OFF for extended

maintenance or an extended shutdown period, the com-

pressor suction, discharge and economizer service stop

valves should be closed (clockwise). If there is a pos-

sibility of liquid freezing due to low ambient tempera-

tures, the coolers should be drained or power should

be applied to the chiller. This will allow the cooler

heater to protect the cooler from freezing down to

- 20°F. Before placing the unit back in service, valves

should be opened and power must be switched on (if

power is removed for more than 8 hours) for at least 8

hours (24 hours if ambient temperature is below 86°F

[30°C]) before the unit is restarted.

Flow switch

Verify a chilled water flow switch is correctly fitted in

the customer's piping on the cooler outlet, and wired

into the control panel correctly using shielded cable.

There should be a straight run of at least five pipe di-

ameters on either side of the flow switch. The flow

switch should be connected to Terminals 2 and 13 in

the panel.

Temperature sensor(s)

Ensure the leaving liquid temperature sensor is coated

with heat conductive compound (Part No. 013-00890-

000) and is inserted to the bottom of the water outlet

sensor well in the evaporator. This sensor is part of the

pump control freeze protection operation. It provides

some freeze protection and must always be fully in-

serted in the water outlet sensor well.

Programmed options

Verify that the options factory-programmed into the

Micro Panel are in accordance with the customer's

order requirements by pressing the OPTIONS key on

the keypad and reading the settings from the display.

Programmed settings

Ensure the system cutout and operational settings are in

accordance with the operating requirements by press-

ing the PROGRAM key.

Date and time

Program the date and time by first ensuring that the

CLK jumper JP2 on the chiller control board is in the

ON position. See Figure 79 on page 170 and Figure

80 on page 171. Then press the DATE/TIME key and

set the date and time (see Page 270).

Start/stop schedule

Program the daily and holiday start/stop by pressing

the SCHEDULE key (see Page 270).

Setpoint and remote offset

Set the required leaving chilled liquid temperature

setpoint and Control Range under the SETPOINTS

key. The chilled liquid temperature control settings

need to be set according to the required operating con-

ditions.

If remote temperature reset (offset) is to be used, the

maximum reset required must be programmed by

pressing the SETPOINTS key (see Page 262).