Unit Power Up; Checking Operating Conditions - Trane CGWF Installation Operation & Maintenance

Power Applied
to CH530
Chiller
Level
CH530 Boot Time
(24 to 42 Sec)
Lead
Circuit
Lag
Circuit
Figure 23

Unit Power UP

CGWF-SVX01A-EN
Unit Start-up
Unit Power Up
Call for Cooling
Auto
(Power
Auto
Up Start
Delay)
Enforce Power Up
Confirm Evaporator
Start Delay Time
Water Flow
(6 to 1200 Sec)
(0 to 600 Sec)
Energize
Evaporator Water
Pump Relay
Auto

Checking Operating Conditions

Once the unit has been operating for about 10 minutes and the system has stabilized,
check operating conditions and complete the checkout procedures that follow.
• Recheck evaporator water and condenser (CGWF) water flows and pressure
drops. These readings should be stable at proper levels.
• Check suction pressure and discharge pressure of the unit.
Discharge pressures - take at discharge line service valve backseat port. Normal dis-
charge pressures are:
CCAF units
CGWF units
Suction pressures - take at Schraeder fitting provided on the suction line. Normal suc-
tion pressures are:
40-60 F LWT = 50-85 psig
15-39 F LWT = 25-50 psig.
• Check compressor oil levels. At full load, oil level should be visible in the oil level
sight glass on the compressor. If it is not, add or remove oil as required.
• Check the liquid line sight glasses. Refrigerant flow past the sight glasses should
be clear. Bubbles in the liquid line indicate either low refrigerant charge or exces-
sive pressure drop in the liquid line. Such a restriction can often be identified by a
noticeable temperature differential on either side of the restricted area. Frost
often forms on the outside of the liquid line at this point also.
Auto
Confirm Condenser
Auto
Enforce Restart
Inhibit Timer
(0 to 5 Mins)
Auto
200 to 360 psig
175 to 275 psig
Waiting to
Running
Start
Water Flow
(6 to 1200 Sec)
Energize
Condenser Water
Pump Relay
Auto
Running
Energize
Cprsr A
Open Liquid Line
Solenoid Valve
79