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Carrier 37HS specifications Ð Connection for Electric Interlock

Models: 37HS

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Fig. 74 Ð Connection for Electric Interlock

Fig. 73 Ð Heating/Cooling Unit Ð Heating, Hot Air in Duct, Electric Changeover in Heating,

Thermostat Closed, Controller Bleeding, Unit Heating

VAV COOLING WITH ELECTRIC HEAT INTERLOCK Ð A conditioned space may contain a Moduline system for cool- ing and a separate heating system such as baseboard electric or hot water or an overhead fan coil. The electric interlock switch enables the cooling and heating systems to operate as the load dictates with overlap.

The electric interlock switch compares the bellows pres- sure with the low pressure, as a practical means of detecting the operating level of the unit. When the unit is delivering, the bellows pressure is signi®cantly lower than the low pres- sure and the electric interlock (differential pressure) switch is open, interrupting the power supply to the heating system. When the unit is shut off, the pressures are approximately equal and the switch closes, allowing the heating system to be energized. It is ®eld installed with the low pressure port piped to the auxiliary bellows pressure stub of the ®lter. (See Fig. 74.) The high pressure port is connected by a ``T'' into the line between the volume regulator and the thermostat.

Fig. 74 Ð Connection for Electric Interlock

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Image 68

Carrier 37HS specifications Ð Connection for Electric Interlock

Contents

37HS Moduline Air Terminals Step 1 Ð Determine Air Volume CfmSystem-PoweredControls With System-PoweredControls WithBUILDING LOAD CALCULATION Fig. 2 Ð 37HS Unit With VAV Controlsfor 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. 9 Ð Single Moduline Unit Connected to Supply DuctFig. 10 Ð Moduline Units in Air Series Fig. 11 Ð Master Unit and Slave UnitsStep 2 Ð Lay Out Terminals Table 3 Ð Recommended Maximum Cfm Per TerminalFig. 14 Ð Diffuser Locations for Preferred 2-Wayor One-WayBlowFig. 16 Ð Locate Units to Prevent Down-Drafts Table 4 Ð Air Throw Data Ð1-Wayand 2-WayBlow, 2-SlotDiffusers Table 5 Ð Air Throw Data ÐFig. 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 7 Ð 37HS2 Units in Air Series cont Table 8 Ð 37HS4 Units in Air SeriesTable 8 Ð 37HS4 Units in Air Series cont Table 9 Ð Maximum Cfm Through the Inlet Collar of a Single Unit or of Units in Air Series0.97+ 0.16 = 1.13 in. wg Master Unit Ð Units with System-Powered Table 10 Ð Minimum Static Pressure at ControlControls and Standard Diffusers Fig. 23 Ð Three 37HS2 ModulineFig. 25 Ð Flexible Duct Used with 90-DegreeBend Table 13 Ð Maximum Number of Units in anAir Series on One Controller Fig. 26 Ð Air Intake on Master UnitFig. 27 Ð Location of Volume Controller on Single UnitPage Fig. 30 Ð Corrected Layout Fig. 31 Ð Control Tubing ConnectionThe corrected layout 1.Room A has its own controllerTHE MODULINE VALVE Fig. 32 Ð Bellows and Unit Air Valve Arrangement UNIT SHUTOFF Ð BELLOWS FULLY INFLATEDUNIT MODULATING Ð BELLOWS PARTIALLY INFLATED UNIT FULL CAPACITY Ð BELLOWS DEFLATEDFig. 33 Ð Cross Section of 37HS Moduline Air Terminal Fig. 34 Ð Bellows ComparisonFig. 35 Ð High and Low Pressure Pick-UpTubes System-PoweredControlsCONTROL APPLICATIONS Fig. 36 Ð 37HS Control Components Fig. 37 Ð Basic 37HS Control OperationFig. 39 Ð 37HS Air¯ow Volume Controller Fig. 42 Ð Diffuser Baffle AssemblyFig. 41 Ð Wall-MountedThermostat Fig. 38 Ð 37HS Control Filter/ManifoldFig. 43 Ð Constant Volume Control Arrangement System-Powered Warm-UpFig. 44 Ð Variable Air Volume Control Arrangement Fig. 45 Ð VAV Control Arrangement forFig. 47 Ð Cooling/Heating Wall Thermostat Fig. 48 Ð Wall-MountedHeating ThermostatFig. 49 Ð VAV Control Arrangement for Electric Warm-UpPneumatic Warm-UpSwitch Fig. 51 Ð VAV Control Arrangement withElectric Heat Interlock Fig. 52 Ð Pilot Valve for Pneumatic SequencedCONTROL SELECTION Table 14 Ð Control IndexTable 15 Ð 37HS Control Combinations Table 15 Ð 37HS Control Combinations cont Table 15 Ð 37HS Control Combinations cont CONTROLTable 15 Ð 37HS Control Combinations cont CONTROLSystem-PoweredControls CONTROL OPERATING SEQUENCESFig. 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. 75 Ð Piping Diagram, Heating/Cooling Fig. 76 Ð Sequence Diagram Ð DA ThermostatFig. 77 Ð Piping Diagram, Heating/Cooling Fig. 78 Ð Sequence Diagram, RA ThermostatFig. 79 Ð Piping Diagram, NO Conguration Warm-UpSwitchFig. 81 Ð Piping Diagram, NC Conguration LEGEND FOR FIG. 79 -AIRFLOW ADJUSTMENT Table 17 Ð Multiple Unit Air¯ow Variation CFMHK08ZZ030 AIR DISTRIBUTION Fig. 86 Ð Typical Room Air Distribution Pattern 37HS Ð 2-WAYBLOW 37HS2 Ð ONE-WAYBLOWPage 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 Table 24 Ð Air Throw Data Ð 1-Wayand 2-WayBlow, 2-SlotDiffusersTable 25 Ð Air Throw Data Ð 2-Wayand 1-WayDirector, 3-SlotDiffusersPage Copyright 1991 Carrier Corporation