Start-Up; Checking Operation; Operating Log Sheet; Chiller Commissioning - York YR TB TB T0 Installation Operation & Maintenance

SECTION 2 – CHILLER COMMISSIONING

START-UP

1. If the chilled water pump is manually operated,
start the pump – the OptiView Control Center will
not allow the chiller to start unless chilled liquid
flow is established through the unit. (A field in-
stalled chilled water flow switch is required.) If
the chilled liquid pump is wired to the OptiView
Control Center the pump will automatically start;
therefore, this step is not necessary.
2. To start the chiller, place the START/STOP con-
trol in the START position. This switch will auto-
matically spring return to the RUN position. When
the START switch is energized, the control center
is placed in an operating mode and the "START
SEQUENCE INITIATED" will be displayed. Any
malfunction will be noted by messages on the 40
character alphanumeric display.

CHECKING OPERATION

During operation, the following conditions should be
checked:
1. On starting, the slide valve should remain un-
loaded until the compressor motor is up to speed
on the run winding; then the slide valve solenoid
valve causes the slide valve to load and unload
the compressor as required to maintain the leav-
ing chilled water temperature equal to the leaving
water temperature setpoint.
2. Check Oil Pressure Display. The oil and oil filter
transducers are compared during compressor op-
eration. A gradual decrease in bearing pressure of
5 to 10 PSI (34 to 69 kPa) (with constant suction
and discharge pressures) may be an indication of
a dirty filter. The filter should be replaced when
pressure loss is 30% of the original pressure. The
actual bearing oil pressure will vary with com-
pressor suction and discharge pressures. When
a new system is first operated under normal full
load conditions, the bearing oil pressure should be
recorded as a reference point with which to com-
pare subsequent readings.
42

OPERATING LOG SHEET

A permanent daily record of system operating condi-
tions (temperatures and pressures) recorded at regular
intervals throughout each 24 hour operating period
should be kept.
An optional status printer is available for this purpose, a
log sheet can be used by Johnson Controls personnel for
recording test data on chiller systems. It is available from
the factory in pads of 50 sheets each under Installation
Check List and Request (Form 160.81‑CL1) and may be
obtained through the nearest Johnson Controls Service
Office. Automatic data logging is possible by connecting
the optional printer and programming the DATA LOG-
GER function (Refer to OptiView Control Center – Op‑
erating and Maintenance (Form 160.81‑O1) Section 3).
An accurate record of readings serves as a valuable ref-
erence for operating the system. Readings taken when
a system is newly installed will establish normal condi-
tions with which to compare later readings.
For example, dirty condenser tubes may be indicated
by higher than normal temperature differences be-
tween leaving condenser water and refrigerant leaving
the condenser.

CHILLER COMMISSIONING

This checklist is provided as a guide to the service
technician to ensure the YR Chiller is properly com-
missioned. Refer to Installation Check List and Re‑
quest (Form 160.81‑CL1).

YR CHILLER START-UP

Start
Start the chiller and operate the chiller at design
… …
conditions or at the maximum load conditions
available.
OptiView Control Center
Recheck the setpoints and programmable func-
… …
tions of the OptiView Control Center. Change as
necessary to match the operating conditions.
Print
Use the OptiView Control Center print feature to
… …
print a copy of all operating data.
Print a copy of the Sales Order Screen.
… …
Important: Save the hard copies of the operat-
ing data and the Sales Order screen. Maintain a
file in the local Johnson Controls Service Office.
FORM 160.81-NOM1
ISSUE DATE: 10/3/2020
JOHNSON CONTROLS