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Carrier 37HS specifications

Models: 37HS

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VAV HEATING Ð It is suggested that the following section be reviewed before reading this section: VAV Cooling, page 56.

VAV HEATING Ð It is suggested that the following section be reviewed before reading this section: VAV Cooling, page 56.

Combining a diffuser-mounted constant volume control pack- age with a wall-mounted thermostat package (heating only) allows the use of Moduline units in VAV heating applications.

The operation of the heating only thermostat is opposite to that of the cooling only thermostat in that the heating only thermostat is reverse acting (RA) instead of direct acting (DA). The thermostat's bleed valve is open when the room tem- perature is above set point. It bleeds air from the low pressure chamber of the volume controller, lowering its pres- sure, and allowing the relatively stronger pressure of the air

in the controller's high pressure chamber to hold closed the bleed from the controller's bellows pressure chamber. The bellows pressure becomes equal to the high pressure in the unit plenum, closing the unit damper and shutting off the unit discharge. See Fig. 66.

As the room temperature falls, the thermostat bleed closes proportionally. This raises the pressure of the air in the low pressure chamber of the controller, forcing the bellows pres- sure chamber bleed open and lowering the bellows pressure proportionally. The damper opens and the unit delivers air to meet the existing demand in the conditioned space. See Fig. 67.

Fig. 66 Ð Variable Volume Controls Ð Thermostat Open, Controller Shut Off, Unit Shut Off

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Carrier 37HS specifications

Contents

System-PoweredControls With 37HS Moduline Air TerminalsStep 1 Ð Determine Air Volume Cfm System-PoweredControls WithFig. 2 Ð 37HS Unit With VAV Controls BUILDING LOAD CALCULATIONFig. 3 Ð Estimating Block Load Fig. 4 Ð Floor Plan of Typical Zonesfor Single-StoryOffice Building DESIGN PROCEDURE with example Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page ·Baseboard ·Overhead air Fig. 6 Ð 35BD Heating Slot Boot Diffuser Fig. 5 Ð Separate Duct Heating SystemPerformance Heating Ð Downblow Slot Fig. 7 Ð Director Diffuser TERMINAL SELECTION AND LAYOUT Table 1 Ð Optimum Outlet DischargeTable 2 Ð Location Guidelines Fig. 11 Ð Master Unit and Slave Units Fig. 9 Ð Single Moduline Unit Connected toSupply Duct Fig. 10 Ð Moduline Units in Air SeriesPreferred 2-Wayor One-WayBlow Step 2 Ð Lay Out TerminalsTable 3 Ð Recommended Maximum Cfm Per Terminal Fig. 14 Ð Diffuser Locations forTable 5 Ð Air Throw Data Ð Fig. 16 Ð Locate Units to Prevent Down-DraftsTable 4 Ð Air Throw Data Ð 1-Wayand 2-WayBlow, 2-SlotDiffusersStep 3 Ð Consider Unit Combinations And Run Fig. 17 Ð Staggered UnitsFig. 18 Ð Unit Spacing Fig. 19 Ð Run-OutDuct for Single Moduline Unit Table 6 Ð 37HS1 Units in Air Series Table 6 Ð 37HS1 Units in Air Series cont Table 7 Ð 37HS2 Units in Air Series Table 8 Ð 37HS4 Units in Air Series Table 7 Ð 37HS2 Units in Air Series contTable 8 Ð 37HS4 Units in Air Series cont of a Single Unit or of Units in Air Series Table 9 Ð Maximum Cfm Through the Inlet Collar0.97+ 0.16 = 1.13 in. wg Fig. 23 Ð Three 37HS2 Moduline Master Unit Ð Units with System-PoweredTable 10 Ð Minimum Static Pressure at Control Controls and Standard DiffusersFig. 26 Ð Air Intake on Master Unit Fig. 25 Ð Flexible Duct Used with 90-DegreeBendTable 13 Ð Maximum Number of Units in an Air Series on One Controlleron Single Unit Fig. 27 Ð Location of Volume ControllerPage 1.Room A has its own controller Fig. 30 Ð Corrected LayoutFig. 31 Ð Control Tubing Connection The corrected layoutTHE MODULINE VALVE UNIT FULL CAPACITY Ð BELLOWS DEFLATED Fig. 32 Ð Bellows and Unit Air Valve ArrangementUNIT SHUTOFF Ð BELLOWS FULLY INFLATED UNIT MODULATING Ð BELLOWS PARTIALLY INFLATEDAir Terminal Fig. 34 Ð Bellows Comparison Fig. 33 Ð Cross Section of 37HS ModulineSystem-PoweredControls CONTROL APPLICATIONSFig. 35 Ð High and Low Pressure Pick-UpTubes Fig. 37 Ð Basic 37HS Control Operation Fig. 36 Ð 37HS Control ComponentsFig. 38 Ð 37HS Control Filter/Manifold Fig. 39 Ð 37HS Air¯ow Volume ControllerFig. 42 Ð Diffuser Baffle Assembly Fig. 41 Ð Wall-MountedThermostatFig. 45 Ð VAV Control Arrangement for Fig. 43 Ð Constant Volume Control ArrangementSystem-Powered Warm-Up Fig. 44 Ð Variable Air Volume Control Arrangementfor Electric Warm-Up Fig. 47 Ð Cooling/Heating Wall ThermostatFig. 48 Ð Wall-MountedHeating Thermostat Fig. 49 Ð VAV Control ArrangementFig. 52 Ð Pilot Valve for Pneumatic Sequenced Pneumatic Warm-UpSwitchFig. 51 Ð VAV Control Arrangement with Electric Heat InterlockTable 14 Ð Control Index CONTROL SELECTIONTable 15 Ð 37HS Control Combinations Table 15 Ð 37HS Control Combinations cont CONTROL Table 15 Ð 37HS Control Combinations contCONTROL Table 15 Ð 37HS Control Combinations contCONTROL OPERATING SEQUENCES System-PoweredControlsFig. 55 Ð Variable Volume Controls Schematic Unit Supplying Air Controller Shut Off, Unit Shut Off Controller Bleeding, Unit Heating VAV HEATING AND COOLING WITH SYSTEM- POWERED CHANGEOVER Ð This application uses a CV control package along with a wall-mountedthermostat pack- age cooling/heating and a system-poweredchangeover con- trol package. The cooling thermostat is direct acting DA while the heating thermostat is reverse acting RA Fig. 62 Ð Heating/Cooling Unit Ð Cooling, Cold Air in Duct, Changeover in Cooling Fig. 64 Ð Heating/Cooling Unit Ð Cooling, Cold Air in Duct, Changeover in Cooling VAV HEATING Ð It is suggested that the following section be reviewed before reading this section: VAV Cooling, page System-PoweredControls with Electric Interface Controller Bleeding, Unit Heating VAV HEATING AND COOLING WITH ELECTRIC CHANGEOVER Ð This application uses a CV control pack- age along with a wall-mountedthermostat package cooling/ heating and an electric changeover package. The change- over valve permits control of the unit to be switched between the cooling and heating sides of a cooling/heating thermo- stat. It is eld-installed in-linebetween the volume control- ler and the thermostat Fig. 71 Ð Heating/Cooling Unit Ð Heating, Hot Air in Duct, Electric Changeover in Heating Fig. 74 Ð Connection for Electric Interlock Fig. 78 Ð Sequence Diagram, RA Thermostat Fig. 75 Ð Piping Diagram, Heating/CoolingFig. 76 Ð Sequence Diagram Ð DA Thermostat Fig. 77 Ð Piping Diagram, Heating/CoolingLEGEND FOR FIG. 79 - Fig. 79 Ð Piping Diagram, NO CongurationWarm-UpSwitch Fig. 81 Ð Piping Diagram, NC CongurationAIRFLOW ADJUSTMENT CFM HK08ZZ030Table 17 Ð Multiple Unit Air¯ow Variation AIR DISTRIBUTION 37HS Ð 2-WAYBLOW 37HS2 Ð ONE-WAYBLOW Fig. 86 Ð Typical Room Air Distribution PatternPage Table 18 Ð Standard Diffusers for 37HS1 Table 19 Ð Standard Diffusers for 37HS2 Table 20 Ð Standard Diffusers for 37HS4 Table 21 Ð Optional Diffusers for 37HS1 Table 22 Ð Optional Diffusers for 37HS2 Table 23 Ð Optional Diffusers for 37HS4 2-Wayand 1-WayDirector, 3-SlotDiffusers Table 24 Ð Air Throw Data Ð1-Wayand 2-WayBlow, 2-SlotDiffusers Table 25 Ð Air Throw Data ÐPage Copyright 1991 Carrier Corporation