Manuals / Carrier / Household Appliance / Air Conditioner

Carrier 37HS specifications Airflow Adjustment

Models: 37HS

1 84

Download 84 pages 16.18 Kb

Page 71

AIRFLOW ADJUSTMENT

Fig. 82A Ð NO Con®guration for Fire Safety

Fig. 82B Ð NC Con®guration for Fire Safety

Fig. 83 Ð Fire Safety Switch Floor Layout

AIRFLOW ADJUSTMENT

Each 37HS volume controller is equipped with a maxi- mum cfm lever for setting the required unit air¯ow in the ®eld. The lever is located at the bottom of the controller. See Fig. 84. The controller has a star wheel located at the top of the controller for setting the minimum air¯ow. The star wheel is also shown in Fig. 84.

Maximum Air¯ow (Cfm) Adjustment Ð The 37HS maximum air¯ow adjustment lever is common to all sizes and is divided into levels of percent cfm. Table 16 shows the unit air¯ow that will be obtained by each lever setting for each unit size.

Table 16 Ð Maximum Air¯ow Settings

LEVER SETTING		UNIT AIRFLOW (CFM)
(% CFM)	37HS1		37HS2		37HS4
120	120		240		480
100	100		200		400
80	80		160		320
40	40		80		160

The maximum cfm is the unit air¯ow obtained when the thermostat is calling for full cooling in a VAV system; it is the design cfm for the space conditioned by the unit or units regulated by one controller.

To set maximum cfm with zero minimum cfm:

1.Set diffuser or wall thermostat for maximum cooling.

2.Turn the minimum cfm star wheel counterlockwise until the internal stop is reached. Do not attempt to override stop. (Minimum cfm has been set at zero, and the unit will turn off when required.)

3.Adjust maximum cfm lever to desired percent cfm.

Minimum Air¯ow (Cfm) Adjustment Ð Some ap- plications require both a design maximum cfm and a mini- mum cfm. The 37HS controller can be set to provide both air¯ow requirements.

To set maximum and minimum cfm:

1.Set diffuser or wall thermostat for maximum cooling.

2.Turn the minimum cfm star wheel counterclockwise un- til the internal stop is reached. Do not attempt to override stop.

3.Shut off unit by adjusting thermostat to zero cool- ing, or disconnect tube from volume controller to thermostat.

4.Place a standard air¯ow hood against the outlet of the master unit and slowly turn the minimum cfm star wheel on the controller clockwise until the desired minimum cfm is reached.

5.Return the thermostat to the desired setting and/or recon- nect tube between volume controller and thermostat.

6.Adjust maximum cfm lever to desired percent cfm.

71

Image 71

Carrier 37HS specifications Airflow Adjustment

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 CALCULATIONfor Single-StoryOffice Building Fig. 3 Ð Estimating Block LoadFig. 4 Ð Floor Plan of Typical Zones DESIGN PROCEDURE with example Page Page Page Page Page Page Page Page Page Page Page Page Page Page Page ·Baseboard ·Overhead air Performance Heating Ð Downblow Slot Fig. 6 Ð 35BD Heating Slot Boot DiffuserFig. 5 Ð Separate Duct Heating System Fig. 7 Ð Director Diffuser Table 2 Ð Location Guidelines TERMINAL SELECTION AND LAYOUTTable 1 Ð Optimum Outlet Discharge 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-SlotDiffusersFig. 18 Ð Unit Spacing Step 3 Ð Consider Unit Combinations And RunFig. 17 Ð Staggered Units 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 ModulineFig. 35 Ð High and Low Pressure Pick-UpTubes System-PoweredControlsCONTROL APPLICATIONS 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 Table 17 Ð Multiple Unit Air¯ow Variation CFMHK08ZZ030 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