12
Sequence of Operation
(Continued on Next Page)
Sequence of Events from a Stop or Auto condition through Start
(No intervening Power Ups or Software Resets.).
Starting Absorber or Condenser Pumps
Time
Line 1
Standard Mode
Display:
Events:
Go to
Time
Line 2
(Below)
Chilled Water Pump Off
Condenser Water Pump Off
Solution Pumps Off
Absorber and Refrigeant Pumps Off
Energy Input Closed
Ignore Interstage Pressure
Sensor Failure Diagnostics.
All Other Diagnostics are
active.
Ventilation Off
Refrigerant Drive Valve (RDV1) Open
Stop
Auto
Wait for Chilled Water Flow,
If flow not established
in less than 4 minutes and
15 seconds then issue:
Chilled Water Flow not Est.
MAR
Differential to Start
is Reached. (Cooling Required)
Ventilation Started
Condenser Water Pump Started
High Temperature Solution Pump
Started (Across the line )
Low Temperature Solution Pump
Started (Adaptive Frequency Drive
(AFD) at Min Speed)
Chilled Water
Pump Started
Wait for a
Call for
Cooling
(See Note 5)
Wait for Condenser Water
Flows,
If flow not established
in less than 4 minutes and
15 seconds then issue:
Condenser Water Flow not
Est.
MMR
Chilled
Water
Flow
Established
Point of Re-Entry if the Operator
Hits AUTO From Dilution Cycle
or
Reset from Diagnostic Auto
or
Waiting for Differential to Start
(System in AUTO Mode)
Variable 6 second to 4
minutes, 15 seconds
Variable 6 seconds to 4 minutes,
15 seconds
Variable
Time
Line 1a
START
AUTO Selected
Time Line 2
Events:
Go to
Time
Line 3
(Next Page)
Standard Mode
Display:
Ignore Interstage
Pressure Sensor
Failures until the Solution
Leaving Low Temperature
Generator (LTG) is 120°F
Command Flame
Safeguard to Begin
Start Sequence.
(See Note 3)
Starting - Pre-Heating Solution
Sequence of Events from a Stop or Auto condition through Start
(No intervening Power Ups or Software Resets.).
If no Combustion
Confirmation after Variable Timer
Expires Issue: Combustion Overdue - MMR
ABDA Combustion
Confirmed
Waiting to Establish
a Mixed Concentration
of 54% Lithium Bromide
Modulate Energy to
Satisfy Low Temperature Heat
Exchanger (LTHX) Crystallization
Margin via Concentration
of Mixed Solution.
Modulate Low Temperature
Solution Pump AFD to
satisfy Leaving Water
Temperature.
Refrigerant Pump
Started
Unit is Running
Starting - Waiting for Combustion
ABDA Only
IF Ventilator Option Installed,
Verify Ventilator Operation
If Not Verified Issue MMR.
Var. Based on Concentration
Hold 40% of
Energy Allowable
Range and Cont.
Pre-Heat with
Refrigerant Pump On
Hold for 3
minutes
to Stabilize
System
Energy Input to 40% of
allowable range and Begin
Pre-Heat with Absorber and
Refrigerant Pumps Off
(See Note 1 and 6)
(See Note 6)
(See Note 3)
Pre-Purge
90+ Seconds
Absorber Pump
Started
Indicates Time Line (1, 2, 3 or 4) Location
Enable Steam
Supply
Pressure
Diagnostic