LAARS M4-LHS - Installation Manual - Manual (Page 25)

HT# 059295-00
A
M4-LHS installation and Operation Manual
25
Boost Mode
(Not Available in Setback Mode)
30 Minutes, Disabled Default: Disable
Button: MENU/<System Startup>/..../Boost Mode
• The morning Boost is designed to return the building to comfortable ambient temperatures
after the cooler Night (Setback) period. The control will accomplish this by running
elevated water temperatures (will add Setback setting to calculated water temperature) for
30 minutes before the start of the Day schedule setting. That is, if the normal day set point
at a specific outdoor was 145˚F and the Setback setting was 20˚F, the boost will raise the
system calculated temperature to 165˚F for 30 minutes before the start of the Day Schedule
setting.
• If no Boost is needed, then simply select Disabled from the Boost Menu.
• Boost is only available if Shutdown or Tstat is selected as an option. See previous setting.
--- BOOST MODE ---
30 Minutes
Disable
BACK ▲ ▼ SAVE
Sensor Fault
All Off, All On Default: All On
Button: MENU/<System Startup>/..../Sensor Fault
• The Sensor Fault will determine the operating status of all output stages that has their Mode
set to Auto when a sensor reads Short or Open.
• When All-Off is selected, the control will turn all boilers Off when the System sensor reads
Short or Open. However, when the Outdoor sensor reads Short or Open, the control will try
to maintain the Minimum Water Temperature.
• When All-On is selected and the Boiler Type was set to other than Hybrid, the control will
turn all boilers On to a 100% when the System sensor reads Short or Open and the outdoor
temperature is below Outdoor Cutoff. However, when the Outdoor sensor reads Short or
Open, the control will try to maintain the Maximum Water Temperature.
• When All-On is selected and the Boiler Type was set to Hybrid, the control will turn all
Non-Condensing boilers On to full fire when the System sensor reads Short or Open and the
outdoor temperature is below Outdoor Cutoff. During that time all Condensing boilers will
turn Off. When the Outdoor sensor reads Short or Open, the control will try to maintain the
Maximum Water Temperature.
--- SENSOR FAULT ---
All Off
All On
BACK ▲ ▼ SAVE
aLErT
A good practice after performing
any Startup menu modification
is to check all operating settings
and adjustments to match the new
settings.
SETTiNg THE CONTrOL TO FaCTOrY DEFauLTS
To Reset the M4-LHS control to its original factory defaults, power down the control.
Hold down the two right most buttons while powering the control back up until the
TOTAL CLEAR STARTED screen appears. The Display will direct you to the Startup
menu to program the control after the defaults are loaded.
TOTAL CLEAR STARTED
Release buttons
and
Please Wait
NOTE: When resetting the control to original factory defaults all control settings will be
overwritten and will no longer exist.
aLErT
Do not turn off power to control until all Startup settings have been made. Otherwise, the next
power-up will be set to many Startup factory settings that may not fit your application.