Trane CGWH 115 - Page 17

17CGWH-SVX01D-E4
• Check fixing of capillary tubes
(protection from vibration and
from wear) and insure that they
are not damaged,
• Reset all manually set control
devices,
• Check refrigerating circuits
tightness
• Check oil acidity,
• Check electrical terminals
tightening of the motors and in
the control panel,
• Check the isolation of the motors
using a 500V DC megohmeter
which meets manufacturer’s
specifications (minimum value
2 meghoms)
• Check the direction of the
rotation using phasemeter.
Electrical power wiring:
• Check all the electrical terminals
tightening,
• Set-up compressors overload
relays,
Electrical control wiring
• Check all the electrical terminals
tightening,
• Check all the pressostats,
• Check and set-up the CH530
control module
• Test and start-up without the
electrical power.
Condenser:
• Check setting of the safety
pressure valve,
• Check the isolation of the motors
using a 500V DC megohmeter
which meets manufacturer’s
specifications (minimum value
2 meghoms)
Operating parameters statement
• Switch on main power supply
switch,
• Start the water pump(s),
• Start up the unit with the CH530
by pushing «Auto». The unit and
the chilled water pumps contactor
must be connected,
• After unit start up, leave
in operation for at least 15
minutes, to insure pressures are
stabilized.
Then check:
• voltage,
• compressors currents,
• leaving and return chilled water
temperature,
• suction temperature and
pressure,
• ambient air temperature,
• blowing air temperature,
• discharge pressure and
temperature,
• liquid refrigerant temperature
and pressure,
• operating parameters:
• chilled water pressure drops
through evaporator. It must be
in accordance with Trane order
write-up,
• superheat: difference between
suction temperature and dew
point temperature. Normal
superheat must be within 5°C
and 10°C,
• sub-cooling: difference between
liquid temperature and bubble
point temperature.
• difference between dew point
temperature in high pressure
and condenser air inlet
temperature.
• difference between outlet water
temperature and dew point
temperature in low pressure.
Normal value on standard unit,
without Ethylene glycol in chilled
water, should be 4 to 6°C. With
407C, it should be about 3°C.
General start-up