MACH® Series
Gas-Fired Boiler
Installation
Page 18
7. The boiler is placed the proper distance from any
combustible walls, in accordance with Section
3.3.3.
8. Relief valves have been piped to floor drains.
9. Condensate piping is properly connected.
10. Verify system fluid pH level is within
specification.
3.11
S
AFETY
C
HECKS
The following checks of safety systems must be made
before putting the boiler into normal operation.
Before firing the boiler refer to Sections 4.1 and 4.2
for information on the use of the controls, lighting, and
shut-down procedures.
WARNING!
Never attempt to operate a boiler that has failed
to pass all the safety checks described below.
WARNING!
After checking controls by manual adjustment,
make sure they are always reset to their proper
settings.
3.11.1 Test of Ignition Safety System
MACH C1500/C2000
Test the ignition system safety shutdown as follows:
1.
Cycle the boiler on by generating a heat request.
(The method for this will depend on your boiler
configuration. See Section 3.12.1.2)
2.
Place the boiler in operation at the high fire
setting. See section 3.12.4 Gas Valve Setup and
Adjustment
, Test Mode High
3.
Smoothly close the downstream manual isolation
valve to reduce the gas flow and cause flame
failure.
4
The display will flash
E-02
indicating a flame
failure. The
E-02
lockout will remain until reset
on the display.
After completing this test, turn off the boiler and open
the downstream manual isolation valve and turn the
boiler back on.
3.11.2 Test of Low Water Cut-out
The boiler is furnished with a probe-type low water
cut-out in the outlet nozzle. Test as follows:
Operation of the switch can be checked by first turning
the boiler off, and then turning the system pump off.
Isolate the boiler from the system pressure. After
isolating the system, drain the water level below the
low water cut-out probe. Turn the boiler back on. It
should not operate, and a manual reset lockout
displaying
E 12
on the display panel will occur. The
LED indicator for Low Water cut-out will no longer be
illuminated.
Return the system to normal operation by refilling and
restarting the boiler and pump. 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 02
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
Low 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.
