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4.2.1 Domestic Hot Water Control (Aquastat in Storage Tank)
The next screen of the Setup Wizard allows the user to choose how the MACH 'n' Roll
controlled for Domestic Hot Water (DHW) operation. If the installation features a normally-closed (break
on rise) aquastat installed in the domestic water storage tank and wired to the P-K MACH
DHW STAT/SENSOR terminals (TB1-9 & TB1-10), select <Aquastat in Storage Tank> and press
<NEXT> to proceed.
The next screen of the setup wizard allows the user to adjust three settings:
•
DHW Appliance Setpoint Temperature
o This is the supply temperature setpoint for the P-K MACH
call for heat from the aquastat in the storage tank.
o NOTE: The "DHW Boiler Setpoint Temperature" must exceed the desired domestic hot
water temperature. For the most efficient and reliable operation, it is recommended to find
the lowest possible appliance setpoint which satisfies the domestic hot water load
requirements.
o NOTE: The "DHW Boiler Setpoint Temperature" will typically need to exceed the setpoint
on the storage tank aquastat by at least 10°F-20°F. Some fine-tuning of this value will be
required in order to satisfy the domestic hot water load requirements.
•
DHW Appliance Max Setpoint Temperature
o The NURO control system provides the ability to increment the "DHW Boiler Setpoint
Temperature" in order to maintain the desired domestic hot water temperature. For
example, in periods of high demand, the NURO control may require the P-K MACH
appliance to operate to a higher supply temperature setpoint.
o NOTE: The "DHW Boiler Max Setpoint Temperature" must exceed the desired domestic
hot water temperature. For the most efficient and reliable operation, it is recommended to
find the lowest possible appliance setpoint which satisfies the domestic hot water load
requirements.
o NOTE: Setting "DHW Boiler Max Setpoint Temperature" equal to "DHW Boiler Setpoint
Temperature" means the P-K MACH
during DHW operation.
•
Max DHW Appliance Temperature
o This is the maximum allowable supply temperature for the P-K MACH
domestic hot water operation. If the P-K MACH
this value, the appliance will be forced to return to "Standby".
o NOTE: The "Max DHW Boiler Temperature" must exceed the desired domestic hot water
temperature. For the most efficient and reliable operation, it is recommended to find the
lowest possible appliance setpoint which satisfies the domestic hot water load
requirements.
These setpoint temperatures can be adjusted in one of 3 methods:
1. Use the <UP> or <DOWN> arrows to adjust the setpoint in increments of 1°F.
2. Move the slider bar left or right to perform quick adjustments to the setpoint.
3. Press the numeric temperature value to access a numeric 0-9 keypad. Once the keypad is
displayed, the user can enter the desired setpoint value.
Revised: January 3, 2020
Released: January 3, 2020
®
appliance will always operate to the same setpoint
Patterson Kelley 2020
All Rights Reserved.
®
P-K MACH
Gas Fired Appliance
Technical Service 1.877.728.5351
®
appliance during a domestic
®
appliance's supply temperature reaches
®
1004905989 MnR & MnRP 300-399-500-750-
1050 NURO Rev C (Jan-2020).docx
™
system is
®
appliance's
®
appliance during
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