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3.6.1 Control Panel for the Circulating Pumps
Remove the lower front sheet metal panel of the MnR750-MnR1050 to reveal the pump control panel.
On the MnR300-MnR399-MnR1050, the pump control panel is located on the left hand side of the lower
frame. The pump control panel features a green light which will illuminate when the pumps are running
in "Auto" mode.
Main Power 4" x 4"
Junction Box at
Rear of Unit
When operating in DHW mode, the P-K MACH 'n' Roll
and TB2-19) from the P-K MACH
appliance receives a domestic hot water call for heat, RELAY C provides contact closure and continuity
for a pilot-duty 120VAC signal. Refer to
The pilot-duty 120VAC pump signal activates to the 120VAC coil on the pump relay, which provides
continuity on the contactor side of the relay, allowing both the appliance and DHW circulating pumps to
run. The pump control panel also features an "Auto/Off/Manual" switch:
•
In the "Off" position, the circulating pumps are disabled.
•
In the "Manual" position, the circulating pumps will run continuously.
•
In the "Auto" position, the circulating pumps will respond to the pump signal from the P-K MACH
appliance's NURO controls. "Auto" is the recommended setting during normal operation.
NOTE: MACH 'n' Roll Pool System model is supplied with a single pump. This pump is for the
Appliance Water loop.
NOTICE! The "Off" position on the pump relay switch is intended for use only when the P-K MACH
'n' Roll
™
system is out of service for maintenance. NEVER change this switch to the "Off" position
while the P-K MACH 'n' Roll
Revised: January 3, 2020
Released: January 3, 2020
NOTE: Image Representative of MnR750-MnR1050
appliance's high voltage terminal block. When the P-K MACH
®
Section 6.1
™
system is in operation.
Patterson Kelley 2020
All Rights Reserved.
P-K MACH
Technical Service 1.877.728.5351
"Auto/Off/Manual"
™
system uses the RELAY C (terminals TB2-18
for more information.
1004905989 MnR & MnRP 300-399-500-750-
®
Gas Fired Appliance
Pump Control
Panel w/
Switch
®
1050 NURO Rev C (Jan-2020).docx
Page 23
®
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