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5
Maintenance
5.1 Maintenance and Inspection Schedule
This schedule applies when the MACH 'n' Roll
unit.
can cause improper and dangerous operation.
If able to determine cause of lockout, then appropriate corrective action should be taken. If unable to
determine cause of the problem, call a qualified service technician.
5.1.1 Daily
•
Observe operating temperature and general conditions.
•
Check the pressure/temperature gauge on the appliance's supply manifold to ensure there is a
sufficient water pressure.
•
Listen to the performance of the P-K MACH 'n' Roll
o A "sloshing" noise indicates that air is present in the system, most likely inside the MACH
appliance. Ensure the vent cap on the automatic air vent is open.
o If the pumps are making excessive noise, ensure they are not deadheaded or cavitating.
Refer to
5.1.2 Weekly
•
Check for leaks in the appliance piping and the domestic piping. Correct immediately if
discovered.
•
Scroll through the appliance's "Information" screen and record the supply temperature, return
temperature, firing rate, and domestic water temperature.
5.1.3 Monthly
•
Check the pump relay and ensure the pumps stop running when switched to "Off". Also ensure
the pumps run continuously when switched to "Manual". Finally, turn the switch back to "Auto"
and ensure the pumps respond to the NURO
•
Check all relief valves by slightly opening the stem. Once you see a small amount of water exit
the discharge, close the relief valve's stem. Once the stem is closed, ensure there is no
additional water that exits the relief valve.
•
Scroll through the appliance's "Information" screen and record the supply temperature, return
temperature, firing rate, burner run high hours, and domestic water temperature.
•
If applicable, verify the domestic temperature sensor reading is accurate in the "Information"
screen.
•
Ensure the high temperature limit aquastat is functioning properly.
Revised: January 3, 2020
Released: January 3, 2020
Proper lockout/ tag out procedure must be employed when servicing this
Label all wires prior to disconnection when servicing controls. Wiring errors
Determine the cause of any lockout or errors before resetting the appliance.
Verify proper operation after operation servicing.
Section 5.3
for troubleshooting information.
Patterson Kelley 2020
All Rights Reserved.
™
is in use. Verify proper operation after servicing.
™
system and P-K MACH appliance.
®
control.
®
P-K MACH
Gas Fired Appliance
Technical Service 1.877.728.5351
1004905989 MnR & MnRP 300-399-500-750-
1050 NURO Rev C (Jan-2020).docx
Page 33
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