IV.
STARTUP
1.
Verify installation is complete and all Pre-Startup steps are completed.
2.
STARTUP CHECKLIST - Review and use. (Typically, located at end of this manual)
3.
Attach refrigerant gauges to the appropriate service ports.
4.
PUMP ONLY: Turn switch to Pump Only (or use local system pump) and operate for at
least 15 minutes. Shut unit down and clean strainer to remove any debris that may
have been in the system. Depending on the system cleanliness, this step may be
conducted several times to help ensure all debris is removed from the system.
5.
Depending on system design, if the pump is operated for extended periods without
cooling, the fluid will heat up.
6.
Once all the air is purged from the circuit and the system is free from debris, verify
that the chilled fluid has the proper flow of 3 GPM per ton of capacity.
a)
Typical systems with a manual bypass valve which are factory set. The valve
must be open enough to ensure proper flow to the evaporator or the system
will shut down on low flow safety condition.
b)
Process systems with automatic and variable control flows will need to ensure
that the bypass valve is throttled to accommodate all stopped process flow.
7.
TEMPERATURE CONTROLLER (See Temperature Controller Section for details):
a)
Set the controller to the desired Set Point value. Typically, for smaller
systems, press and hold the up or down scroll button for two seconds until
the value starts changing. Adjust the value to the desired temperature then
stop pressing any buttons. After two seconds, the new value will become operative. For larger
systems, press Set after changing temperatures. (Do not adjust the set point below the temperature
listed on the unit nameplate).
b)
The controller will also display “Present Value” (upper LED readout) which is an indication of the current
temperature of the fluid in the chiller tank, or “Leaving Fluid Temperature” depending on the specific
chiller design.
8.
COOLING CYCLE: Unit is now ready to turn on for cooling. Move the selector switch to “Cooling Cycle” setting
and the unit will begin cooling.
9.
During the cooling cycle, condenser fans may turn on and off, due to changes in refrigerant pressure. This should
be expected during normal operation and occurs due to ambient temperature and the amount of heat being
returned in the water chiller.
10.
Monitor the temperature at the process location and adjust the Set Value on the temperature controller to
achieve the desired value.
11.
REFRIGERANT CHARGE:
a)
Refrigerant charge may need to be adjusted from the amount listed on the equipment label to achieve
the proper operation of the chiller during final installation site as described below. Typically, on split
systems.
b)
Charging refrigerant during system operation should only be performed into the suction line and then
only is small bursts to ensure liquid does not enter compressor directly.
c)
Conditions to properly adjust the refrigerant charge of the system for optimum performance:
(1)
Chiller to be operated against a full heat load with approximately 70°F or above water temperature.
Basically, the system must be at full capacity.
(2)
Fans for condenser coil must be on. (Bypass the fan cycling switch if necessary). (Flashing may occur
in the refrigerant sight glass when fan turns on and off)
(3)
Refrigerant sight glass must be clear (flooded with refrigerant) while maintaining the appropriate
subcooling and superheat parameters.
CAUTION!: Never charge liquid into the low-pressure side of system when the system is off. Do not overcharge.
During charging or removal of refrigerant, be sure there is fluid flow through the evaporator and all condenser
fan(s) are operating.
MNL_Standard-Basic_ACWC-24to240-E-(IN PROGRESS)_(0815).docx
- 9 -
Summary of Contents for ACWC-180-EM-DR-LT-0-5
Page 35: ...Notes...
