22
Designs, materials, weights and performance ratings
are approximate and subject to change without notice.
Visit
armstrong
international.com for up-to-date information.
Periodic Maintenance - continued
Clean-in-Place (CIP) Instructions for DFSI
a. Close the steam inlet following lockout/tagout procedures.
b. Close the condensate line.
c. Stop recirculation pump(s), close the cold water inlet, recirc return line and mixed water outlet, depressurize the exchanger
(via drain valve).
d. De-energize the DFSI control panel following lockout/tagout procedures.
e. Connect a close pipe nipple and then hose to the HX drain valve and position to drain.
f. Open the cold water inlet to flow water through the heat exchanger, and through the hose to drain. Flush for 10 minutes, or
until the outside of the heat exchanger is cool to the touch.
g. While the heat exchanger is being flushed, prepare the Armstrong CIP unit for service: Connect CIP hoses – with ball
valves closed – to the pump discharge and tank inlet connections. Verify that the tank drain valve is closed. Open the pump
discharge and tank inlet valves. Fill the holding tank with Rite-Qwik™ (minimum of 10 gallons). See CIP unit detail on
following pages.
h. Close the DFSI cold water inlet, and allow flush-water to drain completely.
i. Disconnect hose.
j. Remove the 1” NPT pipe plug from the DFSI cold water inlet CIP connection and replace it with the close pipe nipple supplied
on union-end of the CIP hose. See CIP unit detail on following pages.
k. Remove the 1” NPT pipe plug from the DFSI hot water outlet CIP connection and replace it with the close pipe nipple
supplied on union-end of the CIP hose.
l. Connect the CIP hose from the pump discharge outlet to the close pipe nipple installed on the hot water outlet. Verify ball
valve is closed.
m. Connect the CIP hose from the tank inlet to the close pipe nipple installed on the cold water inlet. Verify ball valve is closed,
and leave tank fill opening uncapped to allow venting.
n. Connect the Armstrong CIP unit power cord to a GFI protected circuit, verify the tank-topump valve is open, and start the pump.
o. Slowly open the ball valve on CIP hose connected to hot water outlet.
p. Slowly open the ball valve on CIP hose connected to cold water inlet. The CIP unit will begin circulating Rite-Qwik™ through the
heat exchanger.
q. Fizzing and foaming in the CIP unit tank will indicate scale is being actively dissolved. Monitor level of foaming, and be prepared to
stop pump to prevent overflow.
r. When the Rite-Qwik™ is no longer fizzing or foaming, the cleaning process is complete. Note that the maximum Rite-Qwik™
circulation time is three hours.
s. Stop the pump, close the CIP hose ball valve connected at the hot water outlet, and allow the heat exchanger to drain to the CIP
tank.
t. Close the CIP hose ball valve connected at the cold water inlet.
u. Disconnect the hose from the CIP tank inlet, and position to drain.
v. Open the cold water inlet to allow fresh water to flush through the heat exchanger, and through the CIP hose to drain. Flush for 15
minutes.
w. Close the cold water inlet, and disconnect the CIP hoses from the Digital-Flo.
x. Remove the close pipe nipples and replace the 1” NPT pipe plugs. Return the close pipe nipples to the CIP hoses for safekeeping.
y. Recommission the DFSI following IMPORTANT instructions on pages 17-18.
z. See Clean-in-Place unit maintenance details on following page.