LAARS Mascot LX MLXC 175 MBH - Install and Operating Manual User Manual
Page 39

Mascot LX Boilers and Water Heaters
Page 35
Laars SIT Parameters
Page 2
P49
CH Priority time over DHW
0 min
SWITCHOVTCH
P50
DHW Priority time over CH
55 min
* displayed as seconds
SWITCHOVTHW
P51
DHW tank setpoint
180 ° F
HWTNKSETP
P52
Stop DHW tank demand offset
0 ° F
HWDEMSTOP
P53
Start DHW tank demand offset
6 ° F
HWDEMSTART
P54
Block DHW demand (combi) offset
12 ° F
HWREGBLO
P55
Unblock DHW demand (combi) offset
20 ° F
HWREGHYS
P56
Minimum user setting DHW set point
60 ° F
CMINHW
P57
Maximum user setting DHW set point
140 ° F
CMAXHW
P58
Frost protection s tart pump temperature
45 ° F
FROSTPMP
P59
Frost protection start burner temperature
37 ° F
FROSTBURN
P60
Frost protection stop burner hysteresis
5 ° F
FROSTHYS
P61
Low outdoor air temperature for heat curve
25 ° F
HC1AX
P62
High setpoint for heat curve
180 ° F
HC1AY
P63
High outdoor air temperature for heat curve
70 ° F
HC1BX
P64
Low setpoint for heat curve
120 ° F
HC1BY
P65
Outside temperature disabling CH demand
90 ° F
HC1OUTLIM
P66
Outside temperature disabling CH hysteeresis
5 ° F
HC1OUTHYS
P70
Minimum user setting CH set point
32 ° F
CMINCH
P71
Maximum user setting CH set point
190 ° F
CMAXCH
P72
Block offset CH demand
10 ° F
CH1BLO
P73
Block hysteresis CH demand
20 ° F
CH1HYS
DH
W
SE
TTIN
G
S
TEM
P.
SE
TTIN
G
S
FR
O
ST P
RO
TE
CTIO
N
&
OU
TD
OOR
R
ES
ET
8.5 SERVICE Mode
The Mascot LX Series of appliances has been
designed with a SERVICE Mode of operation
intended for servicing and troubleshooting of the
unit by a Mascot LX trained service technican.
‘SERVICE' Mode can be activated by pressing
and holding the 'Select/OK' button and ‘Up Arrow’
simultaneously for five seconds. With an active call
for heat, the boiler will light and run at 100% of firing
rate. The boilers input can be adjusted in 20% rate
increments by pressing the ‘Up’ or ‘Down’ Arrows. You
can also toggle between Maximum Rate and Minimum
Rate by pressing the 'Select/OK' button. To exit
SERVICE Mode depress and hold the 'Select/OK' button
for five seconds.
Table 16. Installer Parameters (part 2)
8.6 Modulation Control
The control uses a PID algorithm to adjust the firing
rate of the boiler as the control point is approached.
The goal of the control is to operate at a minimum
firing rate to match the load on the appliance.
8.7 Pump Control
The boiler pump is active anytime there is a call for
heat applied to the control. When there is a central
heat call the system pump relay is active. If there
is a DHW call while the central heat call is active
the system pump turns off. This happens because of
domestic hot water priority, which forces the control
to satisfy the domestic water demand prior to the
hydronic demand. When the last heat demand is
satisfied the boiler pump enters an overrun time.
NOTE: There must be an active call for heat given
to the appliance for Service Mode to allow the
boiler to start. When the Service Mode is exited,
the boiler will continue to run until the call is either
satisfied or removed.
will stop.
The parameter value will return to the previous
setting if you press the Cancel button.
Otherwise, Exit INSTALLER Mode by pressing
and holding 'Select/OK' for 3 seconds.
- Mascot LX MLXC 150 MBH - Install and Operating Manual Mascot LX MLXC 125 MBH - Install and Operating Manual Mascot LX MLXH 220 MBH - Install and Operating Manual Mascot LX MLXH 175 MBH - Install and Operating Manual Mascot LX MLXH 150 MBH - Install and Operating Manual Mascot LX MLXH 125 MBH - Install and Operating Manual Mascot LX MLXH 100 MBH - Install and Operating Manual Mascot LX MLXH 75 MBH - Install and Operating Manual Mascot LX MLXH 50 MBH - Install and Operating Manual