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NX48 and NX51 NXT Stager Controller
Service Manual
TABLE OF CONTENTS
NXT STAGER DIMENSIONS .................................................2
SYSTEM DEFINITIONS .........................................................3
(SYSTEM 14-DEMAND) .........................................................4
TIMER DISPLAY FEATURES.................................................5
CABLES & CONNECTIONS ..................................................5
TIMER OPERATION ..............................................................6
MASTER PROGRAMMING MODE FLOW CHART ...............7
USER PROGRAMMING MODE FLOW CHART ....................9
DIAGNOSTIC PROGRAMMING MODE FLOW CHART ........9
PLUMBING DIAGRAMS .........................................................11
SOLENOID USE.....................................................................14
ASSEMBLY ............................................................................15
ASSEMBLY ............................................................................16
WIRING DIAGRAM 48/51ES STAGER CONTROLLER ........17
TROUBLESHOOTING ...........................................................18
SERVICE ASSEMBLIES ........................................................19
IMPORTANT PLEASE READ:
• The information, specifications and illustrations in this
manual are based on the latest information available
at the time of printing. The manufacturer reserves the
right to make changes at any time without notice.
• This manual is intended as a guide for service of the
controller only. System installation requires information
from a number of suppliers not known at the time of
control manufacture. This product should be installed
by a plumbing professional.
• This product must be installed in compliance with all
state and municipal plumbing and electrical codes.
Permits may be required at the time of installation.
• If daytime operating pressure exceeds 80 psi,
nighttime pressures may exceed pressure limits. A
pressure reducing valve must be installed if pressure
exceeds 125 psi.
• Do not install the unit where temperatures may drop
below 32°F (0°C) or above 110°F (43°C).
• Do not place the unit in direct sunlight. Black units will
absorb radiant heat increasing internal temperatures.
• Do not strike the controller or any of the components.
• Warranty of this product extends to manufacturing
defects. Misapplication of this product may result
in failure to properly condition water, or damage to
product.
• A prefilter should be used on installations in which free
solids are present.
• Correct and constant voltage must be supplied to the
controller to maintain proper function.
43037 Rev F
AU11