Lennox eCOMFORT R32 GAC 035S, Installation, Operating And Maintenance Manual

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• 62 • Installation manual / eCOMFORT R32-MIL166E-0222 - 09/2022
For location inside, keep in mind following advice:
•
In heat pump units during defrost cycle, the units produce a great amount of water melting the ice off coils. If you wish to drain the
water, adequate drainage should be installed below the unit to collect and carry out the water where desired.
•
Air duct installation:
If the air duct has been installed, the operating limits get reduced.
10. For cooling or heat pump units the hydraulic system must contain the following components pump, buffer tank, expansion device,
safety valve, water filter, flow switch.
11. To obtain the total water system pressure drop add the unit pressure drop + water pi fittings and terminal unit pressure drops
the water pump can be selected to provide the correct water flow across the heat exchanger.
12. A water balancing valve is advised to ensure correct water flow.
13. Pressure safety controls must be guaranteed and ensured:
•
The applicable regulations and standards (for example: EN 378-2) will be followed, to apply the appropriate control and guarantee
that the pressure never exceeds the maximum limit.
•
High pressure protection is required to stop compressor operation outside allowable pressure limits. The high pressure control
must be installed correctly, which means that no service valve is allowed between the compressor and the pressure protection.
•
The high pressure cut-out setting will be determined according to the applicable standard, the type of system, the refrigerant and
the maximum allowable pressure PS.
•
Ensure that the pressure never drops below atmospheric pressure. If so, immediately disconnect the power supply to the
compressor and check the cause of the low pressure before restarting the compressor.
CAUTION:
Operation outside the field of application: Compressor failure. A low pressure protection is installed on the suction line to stop
the compressor when operating outside the limits of the enclosure.
WARNING:
Operation below ambient pressure. Fire danger. During operation below ambient pressure, a flammable mixture may form
within the system. Make sure no air enters the system.
14. A crankcase heater is used to prevent coolant from migrating into the housing during periods of non-use. Installation of a crankcase
heater is required when the system load exceeds the load limits stated by the supplier. This requirement is independent of the type and
configuration of the system.
Initial field start-up is a very critical period for any compressor because all loading surfaces are new and require a short break-in period
to withstand high loads in harsh conditions. The crankcase heater must be turned on a minimum of 8 hours before the compressor
is started. This will prevent oil dilution and bearing stress on initial start-up. The crankcase heater must remain energized during
compressor off cycles and must be properly grounded.
15. It is recommended to operate fixed speed scroll compressors with soft-starters. The versions and sizes of the soft-starters must be
selected according to the manufacturer's recommendations, taking into account the amps of the compressor. Due to the design of the
compressors, the internal compression components start unloaded, even if the system pressures are not balanced. Since the internal
pressures of the compressor are balanced at startup, low voltage starting characteristics are excellent and starting components are not
normally required.
16. Good system control should prevent the system from operating outside the published operating range and acceptable superheat
range, regardless of weather conditions and capacity demand. However, under some extreme operating conditions, such as loss of
load or improper control operation, the internal discharge gas temperature reached may damage the compressor. To ensure positive
compressor protection, discharge gas temperature protection is required for any application with these compressors.
WARNING:
Ignition source in a potentially flammable atmosphere: Fire hazard. The crankcase heater is not an ignition source during
normal operation, but could become one if not installed correctly in accordance with the installation instructions. Ensure correct
electrical and mechanical installation.
CAUTION:
Inadequate lubrication: Damage to the scroll assembly. All compressors are equipped with external discharge gas temperature
protection.
2.- INSTALLATION