Armstrong Digital-Flo DF41540, Installation, Operation & Maintenance Manual

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Designs, materials, weights and performance ratings
are approximate and subject to change without notice.
Visit armstrong international.com for up-to-date information.
Armstrong International
221 Armstrong Blvd., Three Rivers, Michigan, 49093 - USA
Tel. (269) 279-3602 Fax. (269) 279-3130
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Installation – continued
Electrical Connection Procedure:
1. Connect the line voltage wire to the side of the fused terminal block marked “LINE”.
2. Connect the neutral wire to a terminal block marked “ACC”.
3. Connect the ground wire to the ground terminal block marked
4. Energize the power source to the control panel and turn the manual selector switch to the “ON” position.
5. The display of the DRV should illuminate, and the safety shutoff valve should power open. Confirm that the safety shutoff
valve position indicator moves from “CLOSED” to the “OPEN” position.
6. Turn the manual selector switch to the “OFF” position.
7. The display of the DRV should deactivate and the safety shutoff valve should power closed. Confirm that the safety shutoff
valve position indicator returns to the “CLOSED” position.
WARNING! The manual selector switch DOES NOT completely de-energize the DRV, and it DOES NOT de-energize the
safety shutoff valve. The control panel must be de-energized (following standard lock-out tag-out procedures) from
the source before opening the control panel, and before servicing the DRV or the safety shut-off valve.
Notes:
The DRV is designed for continuous recirculation. A recirculation pump (not supplied) must be installed on the recirculation
line to the unit. The recirculation pump should operate continuously. Avoid switched power sources, timer-controlled power
sources, and power sources tied to energy conservation circuits.
Each DRV40 requires a minimum continuous recirculation of 5 gpm.
Each DRV50 or DRV80 requires a minimum continuous recirculation of 10 gpm.