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After the "DHW Boiler Setpoint Temperature", "DHW Boiler Max
Setpoint Temperature" and "Max DHW Boiler Temperature" values
have been programmed, press <NEXT> to continue.
The final screen of the Setup Wizard asks the user to adjust the "on
differential" and the "off differential" as shown to the right. A visual
representation of the appliance's "DHW Boiler Setpoint Temperature"
is shown by the horizontal white line. The "on differential" is the lower
temperature deadband which will enable the P-K MACH
operation and is represented by the dashed green line. The "off
differential" is the upper temperature deadband which will disable the
®
P-K MACH
appliance and is represented by the dashed red line.
In the example to the right, the "DHW Boiler Setpoint Temperature" is
153°F, the "on differential" is 4°F, and the "off differential" is 7°F. In
this scenario, upon a domestic call for heat from the aquastat, the P-K
®
MACH
appliance will be enabled when its supply temperature drops
below 153°F – 4°F = 149°F. The P-K MACH
to operate until either the domestic call for heat is removed by the
aquastat, or its supply temperature exceeds 153°F + 7°F = 160°F.
Once the "on differential" and "off differential" are programmed, press
<NEXT> to proceed. The NURO will present a confirmation screen
with a 30 second countdown timer. Press <HOME> to return to the home screen, or simply wait for the
timer to expire. The MACH 'n' Roll
the domestic water storage tank.
For Pool Heater models, program the NURO as Domestic Hot Water being the pool water values.
4.2.2 Domestic Hot Water Control (Temperature Sensor in Storage Tank) – Preferred
The preferred method for controlling the MACH 'n' Roll
sensor installed in the domestic water storage tank, ensure the sensor is wired to the P-K MACH
appliance's DHW STAT/SENSOR terminals (TB1-9 & TB1-10). This temperature sensor should be
installed in the lower 1/3 portion of the storage tank and be of sufficient length to obtain an accurate
temperature reading.
On the Setup Wizard, select <Temperature Sensor in Storage Tank> and press <NEXT> to proceed.
The NURO control allows the user to change the behavior of the temperature sensor to two different
settings: "Sensor as an Aquastat" or "Sensor for Remote Modulation".
•
Sensor as an Aquastat
o The 12kΩ temperature sensor will remotely monitor the domestic water tank temperature
and enable/disable the P-K MACH
differentials.
o The P-K MACH
will not PID modulate to the tank temperature conditions.
o NOTE: If "Sensor as an Aquastat" is selected, press proceed to
•
Sensor for Remote Modulation
o The 12kΩ temperature sensor will remotely monitor the domestic water tank temperature
and enable/disable the P-K MACH
differentials.
o The P-K MACH
o NOTE: If "Sensor for Remote Modulation" is selected, proceed to
Revised: January 3, 2020
Released: January 3, 2020
®
appliance will continue
™
system is now programmed to respond to the aquastat installed in
®
appliance according to the temperature setpoint and
®
appliance will PID modulate to its own supply (outlet) temperature but
®
appliance according to the temperature setpoint and
®
appliance will PID modulate to the tank temperature conditions.
Patterson Kelley 2020
All Rights Reserved.
P-K MACH
Technical Service 1.877.728.5351
®
appliance for
™
is to use a 12kΩ thermistor-type temperature
1004905989 MnR & MnRP 300-399-500-750-
1050 NURO Rev C (Jan-2020).docx
®
Gas Fired Appliance
®
Section 4.2.2.1
Section 4.2.2.2
Page 30
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