CVHE-SVX005C-EN
85
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Unit Start-Up and Shutdown
Procedures
WARNING
Live Electrical Components!
Failure to follow all electrical safety precautions when
exposed to live electrical components could result in
death or serious injury.
When it is necessary to work with live electrical
components, have a qualified licensed electrician or
other individual who has been properly trained in
handling live electrical components perform these
tasks.
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
110°F (43.3°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 15 psig (103.4 kPaG).
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; 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 140°F to 145°F (60.0°C to 62.8°C).
Notes:
• The oil heater is energized during the
compressor off cycle. During unit operation,
the oil tank heater may be de-energized.
• If the chiller is equipped with the free
cooling option, ensure that the free cooling
option is disabled in the Chiller Settings
menu.
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
Start-Up and Shutdown
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