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3.4.3 Example Domestic Hot Water System Installation (Single Unit)
It is important to note that the MACH 'n' Roll
water storage tank. From the initial call for heat, it takes approximately two minutes until the P-K MACH
appliance operates at maximum power, so the storage tank needs to be sized appropriately for the
application. The image below shows a sample piping arrangement for a typical domestic hot water
system.
The P-K MACH n' Roll
can be used for a normally closed high temperature limit aquastat. Alternatively, this high temperature
limit aquastat can be installed in the domestic water storage tank. The normally closed and common
terminals on the aquastat should be wired to the appliance's START INTERLOCK #1 terminals (TB2-7 &
TB2-8). If the domestic water temperature exceeds the high temperature limit aquastat, the MACH 'n'
™
Roll
will go into a blocking error to prevent a high temperature condition. The system will remain in
blocking for 5 minutes after which the NURO control will lockout.
The P-K MACH 'n' Roll
12kΩ thermistor-type temperature sensor installed in the lower 1/3
wired to the appliance's DHW STAT/SENSOR terminals (TB1-7 & TB1-8). Ensure the insertion depth is
Revised: January 3, 2020
Released: January 3, 2020
™
™
system features a thermowell in the domestic hot water supply connection which
™
system requires either a normally-closed operating temperature aquastat or a
Patterson Kelley 2020
All Rights Reserved.
is designed to operate in conjunction with a domestic
rd
of the domestic water storage tank,
®
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 11
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