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Imprimir páginaArmstrong Hot Water, Inc. – DRV40-80 Gen. 2 Troubleshoot Guide
221 Armstrong Blvd., Three Rivers, Michigan 49093 – U.S.A. Phone: (269) 279-3602
Temperature Control Issues
Check
Has the valve been reset
No
(i.e. powered off, then on)?
Yes
Has the valve been re-
No
calibrated?
Yes
Does the valve control
No
under minimum demand?
Yes
Does the system have
sufficient recirculation flow
No
(10gpm min.)?
Yes
Are supply pressures
No
nominally equal (within
5psi)?
Yes
Does the system have
sufficient recirculation loop
temperature loss (2deg
min)?
Reset the valve by
powering down & then
powering back on
Calibrate valve
Isolate recirculation;
create sufficient demand
(10gpm min.) & check
performance
Check recirculation
pump rating; ensure is
capable and running at
min. of 10gpm; if not,
increase pump size
Equalize pressures
Intelligent System Solutions®
armstronginternational.com
Fax: (269) 279-3130
Does the recirculation
Yes
pump run continuously
without an Aquastat?
Yes
Is there adequate supply
water temperatures (hot &
cold supply)
Yes
Are the valve internals free
of debris and clean?
Yes
Are the O-Rings/Seals in
good condition & not
preventing the spool
travel?
Yes
Is the spool lock nut on the
drive shaft tight preventing
any spool slop?
S T E A M ● A I R ● H O T W A T E R
Reduce size of
No
recirculation pump or
slow down flow
Remove aquastat;
recirculation pump
No
should run continuously
Ensure hot water
supply is > than valve
setpoint (min. 2deg F) &
No
cold water supply is <
than valve setpoint
(min. 2deg F)
Remove valve internals
No
and thoroughly clean
Remove valve internals
& check O-rings/Seals
No
to ensure they are
smooth; if not, replace
Tighten lock nut to 80-90
No
in-lb