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Carrier 42V, 42C, 42S, 42D specifications a42-4066, Unit-MountedThermostat Line Voltage

Models: 42V 42D 42S 42C

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a42-4066

Thermostatic 2-Pipe Auxiliary Electric Heat with Valve Control — This system, also called twilight or intermediate season electric heat, goes a long way towards solving the spring and fall control problems of 2-pipe systems.

Chilled water can be run late into the fall, turned on early in the spring and heat will still be available to all units whenever required.

In winter the system is switched over to hot water. Two changeover devices are required for this. One device switches the action of the thermostat and the other locks out the electric heat when hot water is in the coil.

With this system, the fan runs continuously unless manually switched to OFF position. Fan must be on before thermostat can send signal to open chilled water valve or turn on electric heater.

Two control methods are available:

1.Use the standard automatic changeover thermostat with a dead band between heating and cooling.

2.Use a manual changeover thermostat. With this method only one changeover is required.

Be sure to include a 2-way or 3-way electric valve with this system.

NOTE: Wiring diagrams are for 120-v power supply. If other voltages for heaters or controls are specified, wiring may differ from that shown. See Fig. 57 and 58 for line voltage control. See Fig. 59 and 60 for 24-v control.

a42-4066

Δ120-V WHT ALL OTHERS BLK

NEC CLASS 1 WIRING

Fig. 57 — 42SG,SH,SJ,VA,VB,VC,VE,VF 2-Pipe Heating and Cooling with Auxiliary Heat —

Unit-Mounted Thermostat (Line Voltage)

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Carrier 42V, 42C, 42S, 42D specifications a42-4066, Unit-MountedThermostat Line Voltage

Contents

42C,D,S,V Series Fan Coil Air Conditioners Installation, Start-Upand Service InstructionsTable 2 — Physical Data — 42V Series Units Table 1 — Physical Data — 42C Series UnitsPRE-INSTALLATION Fig. 1 — 42CA Furred-InHorizontal Unit Dimensions UNIT a42-4101 A42-4102 A42-4103 A42-4104 A42-4105 Fig. 7 - 42CG Horizontal Cabinet Unit DimensionsLEGEND 1 — Junction Box, 4 in. x 4 in A42-4149 Front Supply, and Bottom Return Dimensionsa42-4150 a42-4151 Front Supply, and Rear Return Dimensionsa42-4152 Front Supply, Rear Return, and Heater DimensionsUNIT UNIT SIZE Fig. 15 — 42VA Furred-InVertical Unit Dimensions Fig. 16 - 42VB Vertical Cabinet Unit Dimensions LEGEND 1 — Standard Stamped Supply Grille Fig. 18 - 42VC Furred-InLowboy Unit Dimensions LEGEND 1 — Unit-MountedControl Box Optional Fig. 20 — 42VE Cabinet Lowboy Unit Dimensions LEGEND A42-4116 Fig. 22 — 42VG Furred-InWall Unit Dimensionsa42-4120 A42-4121 Motor A42-4122Blower Motor A42-4123Blower A42-4124 A42-4125 Fig. 28 — 42SG Furred-InStack DimensionsA42-4126 Fig. 29 — 42SH Cabinet DimensionsA42-4127 A42-4128 Fig. 31 - 42SGM Furred-InMaster Stack DimensionsA42-4129 Fig. 32 — 42SGS Furred-InSlave Stack Dimensionsa42-4154 a42-4155 A42-4171 a42-4167a42-4169 A42-4173A42-4161 PANEL AND FRAME DIMENSIONS inA42-4168 A42-4170INSTALLATION Step 1 — Place Units in Position Risers Fig. 39 — 42SJ Unit InstallationFig. 38 — 42SJ Unit as Shipped Fig. 37 — 42SJ Unit with Standard and Siamese7.Attach unit risers Fig. 41 — Pipe Connection Configurations a42-4177 Hydronic Coil ArrangementField Piping Connections 42VGFig. 43 — Symbols and Placement of Valves COIL a42-4174Fig. 44 — Two-WayMotorized Control Valve Package a42-4175COIL a42-4176COIL COILCOIL COILCOIL COIL42D Unit Shown Fig. 48 - Typical Drain Line DetailsTable 5 — Piping Components Table 5 — Piping Components cont Table 5 - Piping Components cont SYMBOL/SKETCHTable 5 — Piping Components cont SYMBOL/SKETCHJOINT MATERIALS Fig. 50 — Manual Fan Control Fig. 51 — Thermostatic Fan Control 2-PipeSystem Remote/Wall-MountedThermostat Line Voltage a42-4060a42-4061 a42-4059Unit-MountedDebonair Thermostat 24-v,Duct Sensor Unit-MountedThermostat Line Voltage a42-4066VALVE LIMIT SWITCHTHERMOSTAT PART # THERMOSTAT #33CSSN2-FCThermostat 2-PipeTotal Electric Heat with Valve Con- trol— With this system, the complete heating requirement for the space is provided by the electric heater; the water system is never changed over for heating. It is therefore possible, just as with 4-pipesystems, to have heating or cooling at any time of the year a42-4067Remote/Wall-MountedThermostat Line Voltage a42-4073Unit-MountedThermostat Line Voltage THERMOSTAT #33CSSN2-FC a42-4072Unit-MountedThermostat Line Voltage a42-4079a42-4078 Remote/Wall-MountedThermostat Line VoltageRemote/Wall-MountedDebonair Thermostat START-UP SERVICETo Clean Coil Step 7 — Make Final Preparationsc.Reinstall fan deck if removed Page Form 42-3SI Copyright 2009 Carrier CorporationCatalog No. Printed in U.S.AI.Project Information INSPECTION, INSTALLATION, AND START-UPCHECKLISTFAN AND MOTOR