Laars MFTHW199 - Page 64

LAARS Heating Systems
Page 62
5.7InstallerMode(continued)
30:Cr
Auto
Automatic rotation
The rst unit to operate when there is a T/T call is the unit
that ran the least amount of time during the prior heat calls.
Cr:Ct
Cascade Rotation time
Cascade Rotation time
Range: 0-240 Hours, Default 48 Hours
31: Ct
Cascade System
temperature
Cascade System temperature:
Range: 9°F – 180°F, Default 180°F
32: Cd
Cascade System
Temperature Differential
(burner ON)
Cascade System Temperature Differential (burner ON)
Range: 5°F-30°F, Default 10°F
33: HA
High Elevation Mode
High Elevation Mode ( 0-2, 2-5, 5-8, 8-10 ),
Default HA 0
34:AP
AP:cP
Internal CH Pump, CH
Pump and DHW Indirect
Pump Test Mode
This function sets the time to run both the Internal CH and
Internal DHW Storage pumps to purge air from the system.
Range: 1 – 30 minutes,Default 5
P1:oF or
P1:on
Internal CH Pump and
CH Pump Test Mode
Turn this function on to activate Internal CH and CH pump
testing. Only works in installation mode. Turns off when in
normal mode. Default OFF
P2:oF
or
P2:on
Internal CH Pump and
DHW Indirect Pump Test
Mode
Turn this function on to activate Internal CH and DHW
Indirect pump testing.
Only works in installation mode. Turns off when in normal
mode. Default OFF
35:SS
SS:Sd
Allows the user to set the
year of next service
reminder
Allows the user to set the year of next service reminder
XX / XX / XXXX (MONTH / DAY / YEAR)
SS: br
Allows the user to set the
service reminder based
on BURNER RUN HOURS
Allows the user to set the service reminder based on
BURNER RUN HOURS
(0: OFF, 1~9000Hours) , Default 0
36:UC
FAH(°F)
Allows the user to
change the unit
Allows the user to change the unit
Range: °F or °C
CEL(°C)
37: CM OFF
CH Step Modulation
Allows the user to turn ON the step modulation, which
regulates burner output in six steps at one minute intervals.
Step modulation will start at the last modulation rate of the
boiler and work up one minute at a time.
Default: OFF (Selection: OFF or ON).
38: dM OFF
DHW Step Modulation
39: SA
AquA
Select Aquastate
(contact) Type
This mode is aquastate (contact) type.
SEnS
Select DHW NTC
Sensor Type
This mode is NTC sensor type.
40: BP ON
Boiler Pump Allows to turn off boiler pump during DHW call.
Index
Numbers
Parameter Description
27: Cn
Cascade Number
Cascade Number
Range: 0 (Master), 1(slave 1), …., 19(slave 19)
“29: CP” has to be set with the total number of units in the
cascade before “28: Cn” can be set. Default 0
28: CP
Cascade Parameter
Number of units cascaded
Range: 1- 20 , Default 1
29: Eh
Common Vent
Common Vent
Range: ON / OFF, Default OFF