Johnson Controls LSWU035 - Page 128

JOHNSON CONTROLS
128
FORM 145.05-NOM7
ISSUE DATE: 10/31/2019
SECTION 5 – SEQUENCE OF OPERATION
Required Program Values
• PROGRAM key, ECONOMIZER subsection:
“FLUSH CYCLE” must be set to ENABLE
• SETPOINTS key, ECONOMIZER subsec-
tion: “FLUSH DELAY TIME” must be set for
the amount of delay from the time the “FLUSH
CYCLE” is activated until the sequence begins
(default is 0 minutes)
• OPTIONS key, ECONOMIZER subsection:
“ECONOMIZER INSTALLED” must be set to
WATERSIDE
Sequence of Operation - Scheduled On/
Off Operation
The following criteria must be met before the control-
ler initiates a Flush Cycle:
• “FLUSH CYCLE” is ENABLED
• “ECONOMIZER INSTALLED” is set to WA-
TERSIDE
The following must have happened or is in present
state:
• Time is between 7:00 PM and 11:59 PM (19:00
and 23:59); this is usually because these are the
most common times when units are UNOCCU-
PIED,
And
• Unit is in an UNOCCUPIED mode of operation,
And
• No compressors have been ON in the past 5 min-
utes,
And
• 18 hours has elapsed since the last Flush Cycle
Upon initiation of the Flush Cycle, the controller com-
pletes the following:
• Starts a countdown timer to countdown the
time indicated by the “FLUSH DELAY TIME”
setpoint. Wait until the timer expires.
• Turns the “PUMP START” BO to ON
• Changes the “CURRENT OPER MODE” to
“FLUSHING ECONO COIL”
• Drives the “COND WATER VALVE” to 0% (10
VOLTS)
• Drives the “ECONOMIZER WATER VALVE” to
100% (10 VOLTS)
• Waits 3 minutes
• Drives the “COND WATER VALVE” to "COND
VALVE MIN POS"
• Drives the “ECONOMIZER WATER VALVE” to
“WATER ECONO MIN POSITION”
• Waits 1 minute
• Turns the “PUMP START” DO to OFF
Changes “CURRENT OPER MODE” back to previous
mode and resume normal operation.
Sequence of Operation - Scheduled 24/7
Operation
The following criteria must be met before the control-
ler initiates a Flush Cycle:
• “FLUSH CYCLE” is ENABLED
• “ECONOMIZER INSTALLED” is set to WA-
TERSIDE
• Time is 11:59 PM (23:59),
And
No compressors have been ON for the past 5 min-
utes,
And
18 hours has elapsed since the last Flush Cycle
Upon initiation of the Flush Cycle, the controller com-
pletes the following:
• Turn the “PUMP START” BO to ON
• Change the “CURRENT OPER MODE” to
“FLUSHING ECONO COIL
• Drive the “COND WATER VALVE” to 0% (10
VOLTS)
• Drive the “ECONOMIZER WATER VALVE” to
100% (10 VOLTS)
• Wait 3 minutes
• Drive the “COND WATER VALVE” to “COND
VALVE MIN POS”
• Drive the “ECONOMIZER WATER VALVE” to
“WATER ECONO MIN POSITION”