Table of Contents
Advertisement
SECTION 6 - COMMISSIONING
Avoid levels in either oil separator that are above
the middle of the top sight glass. This may cause
excessive oil carryover in the system. High oil concen-
tration in the system may cause nuisance trips resulting
from incorrect readings on the level sensor and tem-
perature sensors. Temperature sensor errors may result
in poor liquid control which will result in liquid over-
feed and subsequently damage the compressor. High
oil carryover may also cause liquid to be returned to the
compressor, which can damage the compressor.
Fans
Check that all fans are free to rotate and are not dam-
aged. Ensure blades are at the same height when
rotated. Ensure fan guards are securely fixed.
If condenser fans are manually operated
in VFD mode, manually turn on all 4 fan
digital outputs before enabling fan control
voltage output. Damage to a fan contactor
or fan VFD may occur if this instruction
is not followed.
Isolation / Protection
Verify all sources of electrical supply to the unit are
taken from a single point of isolation. Check that the
maximum fuse sizes recommended in SECTION 5 -
TECHNICAL DATA has not been exceeded.
Control Panel
Check the panel to see that it is free of foreign materi-
als (wire, metal chips, etc.) and clean out if required.
Power Connections
Check that the customer power cables are connected
correctly to the terminal blocks or optional circuit
breaker. Ensure that connections of power cables within
the panels to the circuit breaker or terminal blocks are
tight.
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 di-
rection of water flow through the evaporator. The inlet
should be at the bottom connection on a two pass evapo-
rator. Purge air from the top of the evaporator using the
92
plugged air vent mounted on the top of the evaporator
body.
Flow rates and pressure drops must be within the limits
given in SECTION 5 - TECHNICAL DATA. Operation
outside of these limits is undesirable and could cause
damage.
If main power must be switched OFF for maintenance
or shutdown, precautions must be taken. See Unit
Maintenance and Shutdown in Sub-freezing Conditions
on Page 94. 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 evaporator outlet, and
wired into the control panel correctly using shielded
cable.
There should be a straight run of at least five pipe diam-
eters 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 out-
let 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
inserted 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. Then press the DATE/TIME key and set the
date and time (See Date/Time and Schedule Keys on
FORM QTC4-NM1
ISSUE DATE: 4/2/2018
QUANTECH
Advertisement
Table of Contents
