Filter
Top Products
MACH® Series
Gas-Fired Boiler Installation
Page 20
3.12 INITIAL ADJUSTMENTS
3.12.1 Operating Temperature Controller
The MACH boiler is equipped with a combination
combustion and temperature control. This control
monitors combustion and lighting of the boiler, as well
as maintaining temperature of the supply water. The
temperature control portion modulates the boiler to
maintain the desired outlet temperature based on the
selected operating configuration.
CAUTION!
The user should become thoroughly familiar with
the operation of the boiler and controls before
attempting to make any adjustments.
3.12.1.1 Operation of the Control
The boiler is operated through the control/display
panel. The display has 3 modes of standard operating
menus. The modes are:
• Standby mode will display (Stby)
• Parameter mode will display (PArA)
• Information mode will display (InFo)
At each level the keys and the display have different
functions. To ascertain which mode you are in, the
displayed information will be shown as indicated
under “display”.
Mode Description Display Example
Standby
(
Stby)
Normal display
mode
1st digit
without a dot
0 180
Parameter
(PArA)
Parameter
settings
1st digit with
a dot 1.125
Information
(
InFo)
display boiler
sensors
1st digit with a
blinking dot*
1.180*
Standby Mode:
The display defaults to this mode at startup or reset of
the control. If no key is pressed for 20 minutes the
display will return to this mode. The function of the
keys may be two-fold as shown below.
Key(S) Duration Function
Mode momentary Change to next mode
Reset momentary Reset the control
Plus momentary
Show the comfort heat
setpoint, or max setpoint
(outdoor reset only)
Plus long*
Turn the comfort heat system
on or off
Minus momentary
Show the domestic hot water
setpoint
Minus long*
Turn the domestic hot water
system on or off
*Note: Long duration is greater than 2 seconds.
When in the Standby Mode the control indicates
boiler status with the first digit of the display. The
remaining digits indicate the boiler's actual
temperature or lockout code. The following table
indicates the meaning of the display digits when in
the standby level.
First Digit
Boiler Status
0 Burner off - No call for heat
1 Pre purge or post purge
2 Ignition
3 Burner on in Comfort Heat mode
4 Burner on in Domestic Hot Water mode
5 Checking the airflow switch
6
Burner off - An internal setpoint has been
reached. System is still calling for heat.
7
Burner off - Comfort Heat pump running on