TEC DB-PR700 Quick Manual
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Copyright 2011 The Energy Conservatory (revised 02-11)Fan Configuration Flow Range (cfm)For Series B Duct BlasterOpen (no Flow Ring) 1,500 - 600Ring 1 800 – 225Ring 2 300 – 90Ring 3 125 – 10Quick Guide DB-PR700One-Point 25 Pascal Total Leakage Duct Pressurization Test (blowing air into the duct system)Using the Minneapolis Duct Blaster and DG-700 Digital Gauge1. Connect the Duct Blaster fan to the duct system.a) Choose a location to install the Duct Blaster fan. In single, double or triple returned systems, the largest and closest return to theair handler is usually the best choice. Note: In multi-return systems (a return in every room), installing at the air handler cabinet isoften best.b) Remove any remote filters from the chosen return and then connect the black square transition piece to the return usingtemporary tape. Completely seal the remaining open area of the return withtape.c) Pull the Duct Blaster fan and flex duct out of the carrying case. Connectthe flex duct to the exhaust side of the fan (i.e. the side with the metalguard) using the round transition piece and connect trim. Connect the openend of the flex duct to the square transition piece using the velcro strap onthe flex duct.d) Connect the fan speed controller to the fan and plug it into a groundedpower outlet.e) Install the Flow Ring which you think best matches the needed fan flow.f) If your DG-700 gauge and fan speed controller are compatible with Cruise Control, install the fan control cable into the 3.5 mmcommunication jacks located on top of the DG-700 and on the side of the speed controller (otherwise skip this step). **2. Prepare the duct system and house for the Test.a) Adjust the HVAC system controls so that the air handler does not turn on during the Test.b) Temporarily seal off all remaining supply and return registers, and combustion or ventilation air inlets which are connected to theduct system. Use Duct Mask temporary register sealing material provided with your Duct Blaster, or use painters tape and paper.c) Turn off any exhaust fans, vented dryers, and room air conditioners.d) Remove all central filters (i.e. in air handler or return plenum).e) Open a door or window between the building and outside to prevent changes in building pressure when the Duct Blaster isrunning.f) If the Duct Blaster is installed in an attic,garage or crawlspace - open vents or accesspanels or doors from these spaces to the outside.3. Connect tubing to the DG-700 PressureGauge.a) Select a location to measure duct pressure.The best location for measuring duct pressure isoften in the supply trunkline or plenum. Drill asmall hole (1/4" to 3/8" OD) into the duct toallow a static pressure probe to be installed.Install the static pressure probe with the end ofthe probe pointing into the air flow that will becoming from the Duct Blaster fan. If the ductsystem is reasonably airtight (e.g. less than 200cfm25 of leakage), duct pressures can bemeasured at any supply register by inserting apiece of tubing through the temporary registerseal.b) Connect tubing to the DG-700 as shown inthe illustration to the right.** Your DG-700 gauge is compatible with Cruise Control if the CONFIG, CLEAR, START and ENTER keys have additional redlettering below the main black script. Cruise Control also requires a Duct Blaster speed controller with a 3.5 mm communication jackinstalled on the side of the controller box, and a fan control cable.Connect the Redtubing to theChan B Input tap.The other end ofthe Red tubingshould beconnected to thebrass tap in themiddle of the DBfan housing.Connect Chan A Reftap to inside ofbuilding (if gauge islocated in thebuilding, leave thistap open). Be surewindow is open.Connect Chan B Reftap to space wherethe fan is installed (iffan and gauge are inthe same space,leave this tap open).Connect the Green (orClear) tubing to theChan A Input tap. Theother end of the Greentubing should beconnected to the ductsystem (by eitherinserting into a sealedregister, or connectingto the end of theinstalled staticpressure probe).Optional fancontrol cable(for Cruise Control). |
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