P-K MACH
®
Gas Fired Boiler
Technical Service 1.877.728.5351
Revised: January 3, 2020
Released: January 3, 2020
Patterson-Kelley 2020
All Rights Reserved.
1004905981 P-K MACH C1500H-C4000 Installation and
Owners Manual (Rev F Jan-2020).docx
Page 43
Safety Checks
The following checks of safety systems must be made before putting
the boiler into normal operation. Before firing the boiler refer to
Section
for information on the use of the controls, lighting, and
shut-down procedures.
3.10.1 Ignition Safety System Test
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.)
2. During the pre-purge cycle (before ignition), smoothly close
the downstream manual isolation valve (inside the boiler
cabinet) to reduce the gas flow.
3. Closing the manual isolation valve will prevent a successful
ignition, and the NURO will display either:
109:
“Ignition Failed”
110:
“Ignition Failure Occurred”
These alarms indicate an ignition failure and the lockout will remain until the control is reset. After
completing this test, turn the boiler off, open the downstream manual isolation valve, then turn the boiler
back on.
3.10.2 Low Water Cut-Out Test
The boiler is furnished with a probe-type low water cut-
out. The probe is installed near the boiler’s
outlet in order to detect the presence of water at the highest possible location in the boiler and is
connected to the low water cut-out circuit board by a single wire. The low water cut-out circuit board is
located inside the boiler’s front door, toward the top of the control panel and is identified with a yellow label.
In order to test the low water cut-out, press and hold the red
“Push to Test” button for at least 5 seconds.
A manual lockout reset error displaying
10010:
“Low Water Limit”
on the NURO touchscreen should
occur. The red LED indicator on the Low Water cut-off will no longer be illuminated.
Optional Test Method:
First turn the boiler of
f, and then turn off the boiler’s circulating pump.
Isolate the boiler from the system. Drain the water level below the low water cut-off probe. Turn
the boiler back on. It should not operate, and a manual lockout reset error displaying
10010:
“Low Water Limit”
on the NURO touchscreen should occur. The red LED indicator on the Low
Water cut-off will no longer be illuminated.
Return the system to normal operation by
refilling with water, restarting the boiler’s circulating pump,
and then turning the boiler back on.
3.10.3 Manual Reset High Temperature Limit Test
The boiler is furnished with a manual reset high temperature limit which features a probe installed near
the boiler’s outlet in order to measure the outgoing supply water temperature. This probe is connected
to the manual reset high temperature limit by a thin, metal capillary tube. The manual reset high
temperature lim
it is located inside the boiler’s front door, toward the top of the control panel and is
identified with a yellow label.
The user should become
thoroughly familiar with the
operation of the boiler and
controls before attempting to
make any adjustments.
Changing parameters
requires an understanding of
the parameters and the
functionality of the boiler.
The boiler may not function
properly if parameters are
changed from the factory
values.
