Installation and Maintenance Manual

Unit Start-Up Procedures
174 RLC-SVX09H-EN
Figure 77. RTUD Power up to starting
Enforce Restart Inhibit Timer
(0 to 5 mins)
RTUD Sequence of Operation Power Up to Starting Compressor
Power
Applied
Auto Mode
Commanded by Front
Panel setting or BAS
Auto
Call for Cooling (adj Differential to Start is met)
Energize Evaporator Water Pump Relay
Set Condenser Fan’s Pre-Flow % per Outdoor Temperature
Confirm Evaporator Water Flow Within 20 minutes
(6 Sec Filter)
Waiting
to Start
Oil Heater always energized
when compressor is de- energized
Waiting
to Start
Power
Up
CH530
Boot Time
(40 to 45 Sec)
Enforce Power Up Start Delay Timer
(adj 0 to 30 mins)
EXV remains closed
* Lead Compressor (and its lead circuit) is determined by staging algorithm – “fixed
staging” or “balanced wear” selection - also influenced by lockouts, restart inhibit, or
diagnostics present
Confirm
Presence of Oil
(0 to 2 mins)
Pre-Position EXV of
Lead Circuit
Energize Unload
Solenoid of Lead Cprsr
Energize Oil Return Fill
Solenoid of Lead Circuit
EXV stroke to
Preposition
0-20 sec
Start Command to Lead Compressor*
EXVs self-
close on power up
Energize Oil Return Drain
Solenoid of Lead Circuit
Send Start Command to Lead Compressor
Confirm Evaporator Water Flow
(6 Second Filter)
Check Evap Pressure for
Low Pressure Cutout