Schreiber Chillers 1055 New - Manual (Page 49)

1055 SERVICE
NOTE: This section is for qualified service personnel only. Procedures outlined in this section of the
manual can cause personal injury or permanent damage to the chiller and the equipment it is cooling.
If you have any questions about the procedures outlined in this section please contact Schreiber
Engineering directly.
Refrigeration System
The 1055 is made up of two separate refrigeration system, the only shared components is the
condenser and it’s fans. A refrigeration system skid can be removed while the other system is
operating. Each system arrives from the factory charged with refrigerant.
Normal Operating Parameters
Suction Pressure 50 psi
Head Pressure 250 psi
Superheat 10 F
Flow Rate (per
evaporator)
8 GPM
Charge (lbs per system) 12 lbs
Low Pressure Switch Set: 15 psi CO, 30 psi CI
High Pressure Switch
Set:
410 psi CO, 375 psi CI
Service Procedures
The following is a guideline for various procedures that may be performed on the refrigeration system
in the event of a mechanical or electrical failure.
System Charging
The system is shipped from the factory fully charged with refrigerant, but charging may be required
after the system has been pump down for component change out. It is assumed that all components
have been replaced, and that any leaks present have been repaired, and that the system has been
thoroughly purged and evacuated.
1. Charge with liquid 75% of the full charge into the receiver.\
2. Start PUMP 2 and compressor being charged as would normally be done. If system 2 is being
charged, shut down compressor 1 to force compressor 2 to cycle.
3. Charge with vapor to the low side until the factory charge is reached.
4. If the sight glass is still fuzzy after the factory charge has been reached, 1 or 2 more lbs can be
added to clear the sight glass. The chiller is factory operated at as close to actual conditions as
possible, so the charge may have to be adjusted slightly.
System Pump Down
1. Disable the LP alarm.
2. Close the receiver outlet valve, and cycle the compressor. TO force the compressor to cycle,
the discharge temperature setpoint can be set lower than the default.