Refrigeration Circuit - Emerson Liebert CRV User Manual

Check cylinder & pan
STEAM GENER-
Check steam hoses conditions
ATING HUMIDIFI-
Verify filling solenoid valve proper operation
ER
Circuit leakage/general condition check
COOLING WATER
Check water(-glycol) inlet temperature
CIRCUIT Check water regulating valve operation
Check in/out water(-glycol) ∆t
(W and C units)
Check mixture glycol level (if applicable)
Check compressor noise/vibrations
Check oil level through compressor sight glass
Adjust/tighten compressor/functional elements
Check sight glass for problem detection
REFRIGERATING
Check starting/running amps
CIRCUIT
Check refrigerating circuit main pressures
Check compressor suction superheat
Check discharge temperature
Check sub cooling
ELECTRONIC
EXPANSION
VALVE and
See appropriate manual
SUPERHEATING
CONTROLLER
(if installed)
Check fan/s bearings
AIR COOLED
Check fan/s motor mounts for tightness
CONDENSER/
Check coil condition
DRYCOOLER (if
Check pipelines supports
applicable)
Check fan/s speed controller operation
WATER / GLYCOL
PUMP See relevant manual
(if applicable)
10.8

Refrigeration circuit

WHEN REPAIRING THE REFRIGERATION CIRCUIT COLLECT ALL REFRIGERANT
IN A CONTAINER: DO NOT ALLOW IT TO ESCAPE.
S When either removing (for repairs) or charging refrigerant this must always be done on both
the high and low pressure sides of the compressor simultaneously.
S The compressor copper plated steel connections should be brazed with a silfos material con-
taining a minimum of 5% silver.
10.8.1 Refrigerant charge of the water-cooled units
1) Start the unit as described in para. 7.1.
2) Manually start the compressor (ensure the unit is not in dehumidification).
3) Wait a few minutes to allow conditions to stabilize.
4) Check the refrigerant circuit using a leak detector. If there is a leak recharge the unit until
the working conditions of the entire refrigeration circuit have become normal.
5) Using a manometer, check that the evaporating temperature is above 0_C.
6) Verify the water pressostatic valve (WV) setting (CHAP. 8).
7) Verify that the superheat is 5-8 K (to do this refer to Chap. 8).
10.8.2 Oil charge R410A
The oil to be used when topping up (only if there are any leaks) is EMKARATE RL
32-3MA (see Tab. f).
Tab. f - EMKARATE RL 32-3MA oil
Viscosity at 40 °C
Viscosity at 100 °C
Viscosity index (ISO Grade)
COMPONENT COMPONENT
41
Maintenance / Spare Parts
MAINTENANCE
PERIOD EVERY
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
31.2 cSt
:
5.6 cSt
:
32
: