Installation InstructionsCONTENTSPageINTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2• VARIABLE AIR VOLUME CONTROLS— 37HS1 UNIT WITH 23-IN. DIFFUSER• VARIABLE AIR VOLUME CONTROLS— 37HS1 UNIT WITH 47-IN. DIFFUSERAND 37HS2 UNIT• VARIABLE AIR VOLUME CONTROLS— 37HS4 UNIT• INTERCONNECTING TUBING, ALL MODELSAIRFLOW ADJUSTMENT . . . . . . . . . . . . . . . . . . . . 9Maximum Airflow (Cfm) Adjustment . . . . . . . . . . 9Minimum Airflow (Cfm) Adjustment . . . . . . . . . . 9INTRODUCTIONThese instructions describe the installation and adjust-ment of the universal variable air volume (VAV) control pack-age. This package contains all necessary control devices andhardware for mounting the system-powered controls on 37HS1,37HS2 and 37HS4 Moduline® units.Note that for certain applications, additional control pack-ages are required and must be ordered separately. Theseinclude wall thermostats, warm-up valves, changeover valvesand electric warm-up valves. Separate installation instruc-tions are provided in these packages.This package supplements the individual VAV control pack-ages offered for specific Moduline models. Table 1 showsthe control packages available for specific models and theuniversal VAV package. Note that the constant volume con-trol package applies to all 37HS models. Figure 1 shows thecontents of the universal VAV control package.Table 1 — Volume Control Package NumbersUNITVARIABLEAIRVOLUME*CONSTANTAIR VOLUME orWALL THERMOSTATAPPLICATIONSPackage Number37HS1 37HS900001 37HS90000337HS2 37HS900002 37HS90000337HS4 37HS900004 37HS900003*The same volume controller is used for all 37HS models; however,other components in the VAV control packages differ.UNITUNIVERSAL VARIABLE AIR VOLUMECONTROL PACKAGE—DIFFUSER THERMOSTATPackage Number37HS137HS237HS437HS900005Fig. 1 — Contents of the Universal VAV Control Package1201008040CFM%37HSUniversal Variable Air Volume Control PackageManufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.Book 3Tab 6aPC 201 Catalog No. 533-716 Printed in U.S.A. Form 37HS-6SI Pg 1 7-91 Replaces: New