Bell-gossett P86272B VS Variable Speed Pump Control User Manual

Model VS Variable Speed Pump Control SAFETY INSTRUCTIONThis safety alert symbol will be used in this manual to drawattention to safety related instru

10RESET OPERATIONReset Ratio (rSt )• The Reset Ratio (rSt ) determines how the Secondary loop watertemperature will vary with outside temperature. Wit

11Setback and Boost (Sbc)• The Setback (Sbc) setting has no effect if the VS is inThermostat mode (see pg. 6).• When the VS is initialized to run in t

Insufficient Heat when the OUTPUT light is ON(Reset Operation):Check all the settings. If the Boiler Return (rtn) sensor readingis below the Low Retur

REQUIREMENTSELECTRICAL SAFETYWARNING: ELECTRICAL SHOCK HAZARDElectrical connections are to be made by a qualifiedelectrician in accordance with all ap

DESIGN SELECTIONTo select the correct pump, pipe size and balance valve:1.Determine the Primary Loop Temperature. This is thetemperature the primary l

PIPINGPIPING OVERVIEW• The Primary loop may have multiple injection loops or othertakeoffs. However, the piping for each injection systemmust meet the

5CONTROL INSTALLATIONMOUNTING THE CONTROL• The VS is designed to mount on a standard 4"x4" electricalbox.• Locate the VS in a convenient loc

6WIRING THE EXT INPUT• The EXT and COM terminals can only accept a dry contactinput.• The control is factory supplied with a metal jumper betweenthe E

7INITIAL SETTINGS FOR A RESET CONTROL(see r on pg. 6)• After setting the operating mode, the VS will display the tem-perature of the Secondary loop. T

8◆These are sensor readings. They can not be adjusted.◆◆The display of each setting will remain active for approximately 20 seconds after the last adj

9OPERATIONOUTPUT LIGHTThe output light has the following three indications:Light Off• The heating system is not active. Neither the Secondaryloop pump