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Armstrong 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

(i.e. powered off, then on)?

Yes

Has the valve been re-

calibrated?

Yes

Does the valve control

under minimum demand?

Yes

Does the system have

sufficient recirculation flow

(10gpm min.)?

Yes

Are supply pressures

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

recirculation pump or

slow down flow

Remove aquastat;

recirculation pump

should run continuously

Ensure hot water

supply is > than valve

setpoint (min. 2deg F) &

cold water supply is <

than valve setpoint

(min. 2deg F)

Remove valve internals

and thoroughly clean

Remove valve internals

& check O-rings/Seals

to ensure they are

smooth; if not, replace

Tighten lock nut to 80-90

in-lb