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When chiller type is 19DV, the refrigerant pump relay will be Turne OFF after 30 seconds post lube.
And then the chilled water/brine pump and condenser water pump will be shutdown.
5.5. Oil Lubrication Control
This section is only available for oil lubrication chillers.
As part of the pre-start checks executed by the controls, the oil sump temp is compared to evaporator
saturated refrigerant temperature. If the oil temperature is less than 140° F (60° C) and less than
evaporator saturated refrigerant temperature plus 50 ^ F (27.8^ C), the start-up will be delayed until
either of these conditions is no longer true. Once this temperature is confirmed, the startup continues.
The oil heater relay is energized whenever the chiller compressor is off and the oil sump temperature is
less than 140° F (60.0° C) or the oil sump temperature is less than the evaporator saturated refrigerant
temperature plus 53^ F (29.4^ C). The oil heater is turned off when either of the following conditions is
true:
Oil sump temperature is more than 152° F (66.7° C)
Oil sump temperature is more than 144° F (62.2° C) and more than the evaporator saturated refrigerant
temperature plus 55^ F (30.6^ C).
The oil heater is always off when the compressor is running.
For chiller type 19XR2~5/C/D/E/V/F, oil pump will be energized for 30 seconds after each 30 minutes
of oil heat relay being energized in order to stir the oil for more evenly distributed heating.
For chiller type 19XR6/7, 30sec/30min time interval is configurable in Service Parameters table->Oil Stir
Cycle(19XR6/7):
Option 0(No stir), there will be no oil stir;
Option 1(30s/30m), oil pump will be energized for 30 seconds after each 30 minutes of oil heat
relay being energized;
Option 2(1m/4h), oil pump will be energized for 1 minute after each 4 hours of oil heat relay
being energized;
Option3(Comb.0&1), for the first 50 hours of chiller in not running status, oil stir will execute as
option1. After 50 hours elapses, there will be no oil stir.
Carrier® SmartVu
TM
can support variable oil pump control and this option is only available for
19XR2~5/C/D/E/V/F currently. The terminal channel is located in IOB1 AO1, and it is a
4~20mA signal. During operation, Carrier® SmartVu
TM
control system will modulate the VFD
speed to control the lubrication system oil pressure difference to between 25psi and 35psi.
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