CDHH-SVX003C-EN
93
WARNING
Toxic Hazards!
A significant release of refrigerant into a confined
space due to a rupture disk failure could displace
available oxygen to breathe and cause possible
asphyxiation. Failure to follow instructions below
could result in death or serious injury.
Should a rupture disk fail, evacuate the area
immediately and contact the appropriate rescue or
response authority.
While the unit is off, do not allow the chiller to exceed
130°F (54.4°C)\. Failure to prevent high chiller
temperature will cause the inside pressure to rise:
• Do not run evaporator water pump longer than 30
minutes after the chiller is shut down.
• Ensure that the evaporator is isolated from the hot
water loop before changeover to heating mode.
The rupture disk is designed to relieve and discharge
the refrigerant from the unit if the pressure in the
evaporator exceeds 50 psig (344.7 kPaG).
Note: Graphic labels (shown above) are used for CE
application only.
Important:
• Before servicing, disconnect all power
sources and allow at least 30 minutes for
capacitors to discharge.
• All electrical enclosures—unit or remote—
are IP2X.
Daily Unit Start-up
1. Verify the chilled water pump and condenser water
pump starter are in ON or AUTO.
2. Verify the cooling tower is in ON or AUTO.
3. Check the oil tank oil level on both oil tanks; the level
must be visible in or above the lower sight glass. Also,
check the oil tank temperature; normal oil tank
temperature before start-up is 128°F to 133°F (53.3°C
to 56.1°C).
Note: Each oil heater is energized during the
compressor off cycle. During unit operation, the
oil tank heater may be de-energized.
4. Check the chilled water setpoint and readjust it, if
necessary, in the Chiller Settings menu.
5. If necessary, readjust the demand limit setpoint in the
Chiller Setpoints menu.
6. Press AUTO.
The control panel also checks compressor motor winding
temperature and a start is initiated after a minimum restart
inhibit time if the winding temperature is less than 265°F
(129.4°C). The chilled water pump relay is energized and
evaporator water flow is proven. Next, the control panel
checks the leaving evaporator water temperature and
compares it to the chilled water setpoint. If the difference
between these values is less than the start differential
setpoint, cooling is not needed.
If the control panel determines that the difference between
the evaporator leaving water temperature and chilled water
setpoint exceeds the start differential setpoint, the unit
enters the initiate Start Mode and the oil and refrigerant
pump and the condenser water pump are started. If flow is
not initially established within 4 minutes 15 seconds of the
condenser pump relay energization, an automatically
resetting diagnostic “Condenser Water Flow Overdue” shall
be generated, which terminates the prestart mode and de-
energizes the condenser water pump relay. This diagnostic
is automatically reset if flow is established at any later time.
Note: This diagnostic does NOT automatically reset if
Tracer
®
AdaptiView™ is in control of the condenser
pump through its condenser pump relay, since it is
commanded off at the time of the diagnostic. It may
reset and allow normal chiller operation if the pump
was controlled from some external source.
If the compressor motor starts and accelerates
successfully, Running appears on the display. If the purge
is set to AUTO, the purge will start running and will run as
long as the chiller is running.
Note: If a manual reset diagnostic condition is detected
during start-up, unit operation will be locked out and
a manual reset is required before the start-up
sequence can begin again. If the fault condition has
not cleared, the control panel will not permit restart.
When the cooling requirement is satisfied, the control panel
originates a Shutting down signal. The inlet guide vanes
are driven closed for 50 seconds, the compressor stops,
and the unit enters a 3-minute post-lube period. The
evaporator pump may continue to run for the amount of
time set using Tracer
®
AdaptiView™.
After the post-lube cycle is done, the unit returns to auto
mode.
Seasonal Unit Start-up
1. Close all drain valves and reinstall the drain plugs in the
Start-up and Shutdown
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