MNL_Standard-NoSpecs_ACWC-18to240-E-_(0713).docx
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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.
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.
6.
TEMPERATURE CONTROLLER
(See Temperature Controller Section for details):
a)
Set the controller to the desired Set point Value (lower LED readout): Push
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. (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.
7.
Unit is now ready to turn on for cooling. Move the selector switch to “Cooling Cycle” setting and the unit will
begin cooling.
8.
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.
9.
Monitor the temperature at the process location and adjust the Set Value on the temperature controller to
achieve the desired value.
10.
While cooling at low load conditions, bubbles may become visible in the refrigerant sight glass. The charging
procedure requires the unit to be under full load with 75°F or above water temperature with clear sight glass for
optimum performance. Returning fluid temperature should not exceed 100°F on standard units or the chiller will
cycle off on high pressure switch and shut down. Should this occur, allow water to cool down by running pump
only and restarting chiller once water is 100°F or colder.
a)
Refrigerant charge may need to be adjusted to achieve the proper operation of the chiller during final
installation as described below. Typically, on split systems.
11.
Refrigerant Charge:
a)
Charging refrigerant during system operation should only be performed in the suction line and then only
is small bursts.
b)
Continue to charge the unit through the suction line service port until the glass is clear with 70
°
F entering
water temperature.
c)
Verify or set the expansion valve (TXV) superheat to approximately 20
°
F as measured 6 to 12 inches from
the compressor on the suction line.
d)
While cooling at low load conditions, bubbles may become visible in the refrigerant sight glass. The
charging procedure requires the unit to be under full load with 70°F or above water temperature with
CAUTION!
: Never charge liquid into the low-pressure side of system. Do not overcharge. During
charging or removal of refrigerant, be sure there is fluid flow through the evaporator and the
condenser fan(s) are operating.
