18
Designs, materials, weights and performance ratings
are approximate and subject to change without notice.
Visit
armstrong
international.com for up-to-date information.
Commissioning - continued
Note: During system start-up, the DRV display may read a “temp low” condition. This error condition should
clear during commissioning. If the error condition does not clear, refer to the DRV IOM Troubleshoot Guide.
6. Open the condensate discharge isolation valves on the
DFSI
7. Supply steam to the
DFSI, slowly
a. Purge any condensate/water in the system
b. DO NOT exceed 15 psi of steam pressure
8. Confirm all supply temperatures and pressures are sufficient
a. Hot water
b. Cold water
c. Recirculation return
9. Observe the DRV adjust to and maintain the setpoint pre-programmed at the factory (based information provided
on the IDF). Give open fixtures time to evacuate air from the system.
10. Shut off all open fixtures and confirm presence of continuous recirculation.
11. Monitor DRV outlet and confirm it is maintaining set point
a. New systems may take some time for the recirculation return temperature to rise to an appropriate level.
Note: The setpoint of the DRV is preset based on information provided to Armstrong. To adjust the DRV
setpoints, high limit error temp, or to enable/disable other integral valve features, refer to the DRV
installation and operation manual (IOM).
Note: When starting-up a DFSI, it is very important that the water supply is turned on to the unit BEFORE any
steam is turned on. Once the unit is operating, the inlet water valve should NEVER be closed unless the steam
is turned off first. When shutting down a unit, BEFORE closing off the supply water to the unit, always first shut
off the steam and then allow water to run through the unit until it has cooled and completely condensed all
remaining steam in the heat exchanger.
Display as seen during normal operating mode
Temp. 119˚F
Setpoint 120˚F
Temp. 119˚F
Setpoint 120˚F
Current Outlet Temperature
Current Setpoint