Test Of High-Limit Control; Test Of Gas Pressure Switch; Initial Adjustments; Operating Temperature Controller For Mach® Series Boilers - Patterson-Kelley MACH Series Installation & Owner's Manual

MACH® Series Gas-Fired Boiler
will occur. The LED indicator for Low Water cut-out
will no longer be illuminated.
Return the system to normal operation and restart the
boiler. Refer to Section 4.2.1.

3.11.3 Test of High-Limit Control

Fire the boiler and test the high limit control as
follows:
With the main burner operating, turn down the
temperature setting on the "high-limit" thermostat until
the main burner shuts off. A manual reset lockout
displaying E 12 on the display panel will occur. The
high-limit switch must be manually reset prior to
resetting the boiler at the display panel. Readjust the
high-limit thermostat to the desired setpoint.

3.11.4 Test of Gas Pressure Switch

The boiler is furnished with a low gas pressure switch.
The operation of this switch must be checked by
slowly closing the main gas cock while the burner is
operating. The switch should shut down the main
burner. When the gas pressure switch opens, a manual
reset lockout displaying E 12 on the display panel will
occur. Upon re-opening the main gas cock, the E 12
indicator will remain on until the display panel is
manually reset.
Units equipped with a high pressure switch must be
checked by closing the downstream gas cock while the
burner is operating. The switch should shut down the
main burner. When the gas pressure switch opens, a
manual reset lockout displaying E 12 on the display
panel will occur. Upon re-opening the gas cock, the E
12 indicator will remain on until the display panel is
manually reset.
3.12 I
NITIAL
3.12.1 Operating Temperature Controller for
MACH® Series Boilers
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
Standby
Stby)
(
Parameter
PArA
( )
Information
InFo
( )
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A
DJUSTMENTS
Description Display
Normal display 1st digit
mode without a dot
1st digit with
Parameter
settings a dot
display boiler 1st digit with a
sensors blinking dot*
Installation
Example
0 180
1.125
1.180*