McQuay MicroTech 200 Series, Operating Manual

Page: 34 / 46

34 OM 200MICRO
Menu 23, Lead Lag Setup
Item
Screen Line Display Field Range Extended Name
Slave Address=01.00 1 00-09 Slave Unit Network Address
NoUnload 1
Start-Up=NotUnld 2
Unload
Unload Lead During Lag Start
Auto
Slave Lead LL Mode=auto 1
Master Lead
Lead Lag Control Mode
2
Enable Lag=95% 2 0-100% Lag Start Threshold
N/A
Sun
Mon
Tue
Wed
Thu
Fri
LL SwOver=N/A 1
Sat
Scheduled Lead Unit Switch
Over Day
1
3
Disable Lag=40% 2 1-100% Lag Stop Threshold
1 Delay timer=5Min 1 1-60Min Lag Unit time Delay
2
2 Lag-Standby=No 1 No-Yes Lag Unit Standby Operation
Slave Address= This value is the network address of the slave MicroTech. The wrong value will
disconnect the communications between the chillers and they would revert back to local control. This
could cause damage to a dual chiller unit. The slave address should be 01.01.
Start-Up= This value directs the lead chiller to unload or not to unload. A dual chiller must unload the
lead chiller when starting the lag chiller. This is optional in a two (2) single chiller configuration.
LL Mode= The value selected will direct the network to start the chillers in a fixed sequence.
Auto —The chiller with the least run time will start as the lead unit. The chiller with the most run
time will turn off first when only one chiller is required to meet load conditions.
Slave Lead —The slave chiller will start first each time and the master chiller will shutdown when
only one chiller is needed to meet load requirements.
Master Lead —The master chiller will start first each time and the slave chiller will shutdown when
only one chiller is needed to meet load requirements.
Enable Lag= This is the amp value (percentage) when the lag chiller will be started. This value must
be maintained for a predetermine amount of time to indicate a true load.
LL SwOver= Day of week for lead lag switch to occur.
Disable Lag= This is the amp value (percentage) when the lag chiller will be shutdown. This value
must be maintained for a predetermine amount of time to indicate a true load.
Delay Timer= This value is used to delay the starting and stopping of the lag chiller. The maximum
amps must be maintained for the period of the Delay Timer value before the lag chiller will start. The
minimum amps must be maintained for the period of the Delay Timer value for the lag chiller to stop.
Lag-Standby= This value sets the lag chiller as a standby chiller and will only start if the lead chiller
fails.
Press the "NEXT MENU" key and menu 24 (Service) will be displayed. Menu 24 has three screens.
This menu is password protected and requires the service password.