Carrier 42 User Manual

Application Data

Control Selection Guide

for Fan Coil Air Conditioners

42 Series

Fan Coil Units

Manufacturer reserves the right to discontinue, or change at any time, speciﬁcations or designs without notice and without incurring obligations.

Book 3 Tab 7a

PC 201 Catalog No. 514-203 Printed in U.S.A. Form 42-3XC Pg 1 6-90 Replaces: 42-2XC

CONTENTS

Page

CONTROL SELECTION GUIDE ............... 3

STANDARD WIRING PACKAGES ............ 4-8

Manual Fan Control ......................... 4

Thermostatic Fan Control,

2-Pipe Systems ............................ 4

Thermostatic Fan Control,

2-Pipe System with Safety Cycle ............ 5

Thermostatic Electric Valve Control, 2-Pipe ... 5 Thermostatic 2-Pipe Auxiliary Electric Heat

with Valve Control ......................... 6

Thermostatic 2-Pipe Total Electric Heat

with Valve Control ......................... 7

Thermostatic Valve Control, 4-Pipe ........... 8

ELECTRIC HEAT ............................ 9

Application ................................. 9

Heater Construction ......................... 9

Heater Electrical Data ....................... 9

REMOTE-MOUNTED CONTROLS ............ 10

Standard 3-Speed Switch ................... 10

Combination Thermostat/3-Speed Switch .... 10

Wall Thermostat, 2-Pipe .................... 10

Wall Thermostat, 4-Pipe .................... 10

ALTERNATE WALL THERMOSTATS ......... 11

Wall Thermostat (Honeywell) with Manual

3-Speed Fan Switch and ON-OFF Switch ... 11 Wall Thermostat (Sunne) with Manual

3-Speed Fan Switch and ON-OFF Switch ... 11

Page

UNIT MOUNTED CONTROLS .............. 12,13

Standard 3-Speed Switch ................... 12

Combination Thermostat/3-Speed Switch .... 12

Combination Thermostat/ON-OFF

Toggle Switch ............................ 12

Two-Pipe Thermostat ....................... 13

Four-Pipe Thermostat ...................... 13

Automatic Changeover ..................... 13

BASIC DEFINITIONS ....................... 14

FIELD PIPING CONNECTIONS .............. 15

VALVE PACKAGES ....................... 16-19

General ................................... 16

Two-Way Motorized Control Valve ........... 18

Two-Way Motorized Control Valve

with Aquastat Bleed Bypass Line .......... 18

Three-Way Motorized Control Valve ......... 19

No Motorized Control Valve ................. 19

VALVE PACKAGE ARRANGEMENTS ....... 20-23

PIPING COMPONENTS .................... 24-27

Cv FACTOR vs WATER PRESSURE DROP ... 28 SYSTEM COMPONENT WORKING

PRESSURE ............................... 29

COPPER WATER TUBE AND JOINT MATERIAL

PRESSURE RATINGS ..................... 30

CORRECTION FACTORS FOR GLYCOL ...... 31

STANDARD ACCESSORIES AND OPTIONS .. 32

CONTROL SELECTION GUIDE

Use this guide to make sure that all necessary components are provided for and that the components are compatible

with the required control system. NOTE: When thermostatic fan control is selected or when unit outside air dampers are used, unit-mounted thermostats

are not recommended as their use will result in poor room temperature sensing.

SYSTEM DESCRIPTION THERMOSTAT

Fan Control (2-Pipe)

Twoposition electric valves (2-pipe)

2-PIPE HEATING-COOLING*

Pneumatic modulating valves (2-pipe)

Twoposition electric valve with Auxiliary Electric Heat (2-pipe)

Twoposition electric valve with total electric

ELECTRIC HEAT

heat (2-pipe)

Pneumatic modulating valves (2-pipe)

Twoposition electric valves (4-pipe)

4-PIPE

Pneumatic modulating valves (4-pipe)

Fan manually cycled None None None Standard Thermostat cycles fan on-off

from speed set with fan switch.

Thermostat cycles fan on-off from fan speed set with switch. Mode automatically switched by changeover sensing water temp.

Thermostat cycles fan from high to low on cooling and low to off on heating.

Thermostat cycles valve open or closed.

Thermostat cycles valve open or closed. Mode automatically switched by changeover sensing water temp.

Thermostat modulates pneumatic control valve.

Thermostat cycles valve open or closed. 2° F after valve closes, thermostat activates electric heater. Heater can’t turn on if hot water is in coil.

Thermostat cycles valve open or closed. Manual changeover switch changes thermostat to heat to activate electric heater.

Thermostat cycles valve open or closed. 2° F after valve closes, thermostat activates electric heater.

Thermostat modulates pneumatic control valve. After changeover, thermostat activates electric heater.

Thermostat cycles cooling and heating valves open or closed.

Thermostat cycles cooling valve open or closed. 2° F after valve closes, thermostat cycles heating valve open or closed.

Thermostat modulates cooling valve. After changeover, thermostat modulates heating valve.

Wall mounted includes heat-cool switch.

Wall mounted. Heating/cooling Thermostat

Wall or unit mounted

Wall mounted includes heat-cool switch.

Wall or unit mounted. Heating/cooling Thermostat

By others. By others. 2- and 3-way

Wall or unit mounted. Sequenced heating and cooling.

Wall mounted includes heat-cool switch.

Wall or unit mounted. Sequenced heating and cooling

By others. By others. 2- and 3-way

Wall mounted includes subbase with heat-cool switch.

Wall or unit mounted. Sequenced heating and cooling.

By others. By others. 2- or 3-way

CHANGEOVER

SUPPLY PIPE

None None Thermostat has

Yes None Standard

Yes None No Standard

None Motorized (N.C.)

Yes Motorized (N.C.)

Yes. Two Required.

None Motorized

None Motorized (N.C.)

VALVE

3-way or 2-way, no bypass required.

3-way or 2-way

furnished by others. Can be equipped with factory assembled valve package.

Motorized 3-way or 2-way

3-way or 2-way, no bypass required

furnished by others. Can be equipped with factory assembled valve package.

3-way or 2-way (requires 2 valves)

furnished by others. Can be equipped with factory assembled valve package.

FAN

SWITCH (SW)

3-Speed SW integral

3-Speed SW 3-Speed SW

3-Speed Switch, ON-OFF toggle SW only

Thermostat has integral 3-Speed SW

Standard 3-Speed SW. Others have thermostats with integral 3-Speed SW

Standard 3-Speed SW

Standard 3-Speed SW Others have thermostats with integral 3-Speed SW

Thermostat has integral 3-Speed SW

Standard 3-Speed SW

Thermostat has integral 3-Speed SW

Standard 3-Speed SW. Others have thermostats with integral 3-Speed SW

Standard 3-Speed SW

*If system is HEATING-ONLY or COOLING-ONLY, no changeover or bypass is required. NOTE: Unit-mounted thermostats are not recommended with either fan-cycle control or applications with outside air dampers.

NOTES

Not recommended for high humidity application

Unit mounted thermostats provide very poor room temperature control

Best fan cycle control for high humidity applications

Valve packages with belled end(s) for ﬁeld soldering to coil.

Factory assembled in valve package w/ﬂare nuts. Valve packages with belled end(s) for ﬁeld soldering to coil.

Valve packages with belled end(s) for ﬁeld soldering to coil.

Factory assembled in valve package w/ﬂare nuts. Valve packages with belled end(s) for ﬁeld soldering to coil.

Valve packages with belled end(s) for ﬁeld soldering to coil.

Factory assembled in valve package w/ﬂare nuts. Valve packages include unions for for ﬁeld assembly to coil.

STANDARD WIRING PACKAGES

IMPORTANT: Wiring diagrams shown depict typical control functions. Refer to unit wiring label for speciﬁc functions.

Manual Fan Control — On all Vertical Cabinet units,

the standard fan-speed switch is furnished unit-mounted and wired. On all VerticalFurred-In units and all Horizontal units, the switch is shipped separately on a decorative wall plate for ﬁeld mounting and wiring.

The standard switch has LOW,MEDIUM, HIGH and OFF positions plus an auxilliary contact to energize thermostats, valves, dampers, etc.

NOTE: Wiring diagrams are for 120-v power supply.If other voltages for heaters or controls are speciﬁed, wiring may differ from that shown.

The standard 3-speed switches are illustrated on page 12 (unit mounted) and on page 10 (wall mounted).

For NOTES, see below.

Thermostatic Fan Control, 2-Pipe Systems —

The thermostat cycles the fan on and off from any selected speed setting to maintain selected room temperature. Controls can be wired for heating-only,cooling-only or for heating/ cooling by the addition of an automatic changeover device that senses water temperature and changes the action of the thermostat as required.

For control package descriptions, see control components sections entitled Remote-Mounted Controls and UnitMounted Controls, pages 10-13.

NOTES:

1. Motors are thermally protected.

2. Use copper conductors only.

3. See unit nameplate for power supply. Provide disconnect means

and overload protection as required.

4. Unit-mounted thermostats are not recommended for fan control

because of poor temperature sensing. Fan control not available on 42VC,VE Loboy units.

THERMOSTAT OR

UNIT

TYPE

Vertical Unit Mounted N/A N/A Vertical

Horizontal

*Packages listed on current price pages. First 2 digits are item

numbers.

†For alternate thermostat with manual changeover. Refer to current

price pages.

LOCATION

Wall Mounted

WIRING PACKAGE*

Heating or

Cooling Only

22-C, 22-D

22-E, 22-F

Heating and Cooling

Plus Changeover†

22-A, 22-B

Thermostatic Fan Control, 2-Pipe System with Safety Cycle —

situations in which condensate problems can occur if fan is turned off while chilled water is still running through the coil.

The wiring provides fan cycling from HIGH to LOW on the cooling cycle and from LOW to OFF on the heating cycle. An ON-OFF toggle switch replaces the standard 3-speed fan switch. The toggle switch can be concealed to ensure that the unit runs on low speed when cooling. This action greatly reduces the chance of condensation problems that exist with other standard fan cycling controls.

For control package descriptions, see control components section entitled Remote-Mounted Controls and Unit-Mounted Controls.

This control is used for high humidity

UNIT

TYPE

Vertical Unit Mounted 24-R Vertical

Horizontal

* Packages listed on current price pages.

LOCATION

Wall Mounted 23-17

Heating and Cooling

PACKAGE CODE*

Plus Changeover

For NOTES, see below.

Thermostatic Electric Valve Control, 2-Pipe —

A thermostatically controlled 2-position valve provides superior control to fan cycling. With this control, the fan runs continuously unless it is manually switched to the OFF position. The fan must be on before the valve can be opened to supply water to the coil.

This system can be used for normal 2-pipe changeover systems and can also be furnished for cooling-only or heatingonly applications by omitting the changeover and specifying which application is intended.

NOTES:

1. Motors are thermally protected.

2. Use copper conductors only.

3. See unit nameplate for power supply. Provide disconnect means

and overload protection as required.

For control package descriptions, see control components sections entitled Remote-Mounted Controls and UnitMounted Controls.

THERMOSTAT OR

UNIT

TYPE

Vertical Vertical

Horizontal

*Packages listed on current price pages. First 2 digits are item

numbers.

†For alternate thermostat with manual changeover. Refer to current

price pages.

LOCATION

Unit

Mounted

Wall

Mounted

WIRING PACKAGE*

Heating or

Cooling

Only

24-M,

24-N

22-C, 22-D,

22-E, 22-F

Heating and

Changeover†

22-A, 22-B

Cooling

Plus

24-L

ELECTRIC

VALVE

Any 2- or

3-way,

2-position

valve

package.

STANDARD WIRING PACKAGES (cont) Thermostatic 2-Pipe Auxiliary Electric Heat

with Valve Control —

light or Intermediate Season electric heat, goes a long way towards solving the spring and fall control problems of 2-pipe systems.

You can run chilled water late into the fall, turn it on early in the spring and still have heat 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.

UNIT

TYPE

Vertical Vertical

Horizontal

*Packages on current price pages.

This system, also called Twi-

LOCATION

Unit

Mounted

Wall Mounted

Automatic System Manual System

24-Q Available on Special Order.

22-J, 22-K,

23-09, 23-10

Two control methods are available:

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

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.

For control package descriptions, see control components sections entitled Remote-Mounted Controls and UnitMounted Controls.

WIRING PACKAGE*

23-15, 23-16

ELECTRIC

VALVE

Any 2- or 3-way,

2-position valve

Package.

NOTES:

1. Motors are thermally protected.

2. Use copper conductors only.

3. See unit nameplate for power supply. Provide disconnect means and overload protection as required.

Thermostatic 2-Pipe Total Electric Heat withValve Control —

ing 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-pipe systems, to have heating or cooling at any time of the year.

The fan runs continuously unless it is manually switched to OFF position. Fan must be on before thermostat can send signal to open chilled water valve or turn on electric heater.

Normally,an automatic changeover thermostat with a dead band between heating and cooling is used, but a manual

With this system, the complete heat-

changeover thermostat is also suitable. A 2-way or 3-way valve must also be used so that the chilled water is off whenever the heater is on. No changeover device to sense water temperature is necessary.

NOTE: Wiring diagrams are for 120-v power supply. If other voltages for heaters or controls are speciﬁed, wiring may differ from that shown.

For control package descriptions, see control components sections entitled Remote-Mounted Controls and UnitMounted Controls.

UNIT

TYPE

Vertical Vertical

Horizontal

*Packages on current price pages.

LOCATION

Unit

Mounted

Wall Mounted

WIRING PACKAGE*

Automatic System Manual System

24-Q Available on Special Order.

22-J, 22-K,

23-09, 23-10

23-15, 23-16

ELECTRIC

VALVE

Any 2- or 3-way,

2-position valve

Package.

NOTES:

1. Motors thermally protected.

2. Use copper conductors only.

3. See unit nameplate for power supply. Provide disconnect means and overload protection as required.

STANDARD WIRING PACKAGES (cont) Thermostatic V alveControl, 4-Pipe —

The 4-pipe system provides the ultimate in economy and room temperature control. Both hot water and chilled water are available at any time.

Normally an automatic changeover thermostat is used, but a manual changeover thermostat is also suitable. Two2-way valves, two 3-way valves, or one 2-way plus one 3-way valve must be selected. An automatic changeover device to sense water temperature is not required.

UNIT TYPE LOCATION

Vertical Unit Mounted 24-P Available on Special Order. Vertical

Horizontal

*Packages on current price pages.

Wall Mounted

Automatic System Manual System

22-G, 22-H,

23-07, 23-08

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

NOTE: Wiring diagrams are for 120-v power supply.If other voltages for heaters or controls are speciﬁed, wiring may differ from that shown.

For control package descriptions, see control components sections entitled Remote-Mounted Controls and UnitMounted Controls.

WIRING PACKAGE*

23-13, 23-14

ELECTRIC

VALVE

Any 2- or 3-way,

2-position valve

package.

NOTES:

1. Motors thermally protected.

2. Use copper conductors only.

3. See unit nameplate for power supply. Provide disconnect means and overload protection as required.

ELECTRIC HEAT Application —

Electric heaters are available for in-stallation on Carrier fan coil units in the following applications.

TOTAL ELECTRIC HEAT — This system provides complete heating during the heating season; no boiler is required. Heating and cooling are now available on an individual basis throughout the year with a 2-pipe system.

Chilled water is used for cooling and the electric heater is used for heating. Room controls can be supplied for either manual or automatic changeover.

AUXILIARYELECTRIC HEAT — This system is used for heating between seasons or during the cooling season when chilled water is being circulated. Individual room controls are supplied to provide electric heat only when chilled water is being circulated through the system. Water ﬂow through the unit is shut off when the heater is turned on.

During the winter heating season, heating is provided by hot water circulated through the system. A changeover device locks out the electric heat when the hot water is circulated.

Heater Construction

STRIP HEATERS — Used with Model 42C ceiling units, Model 42D ducted units and Model 42S stack units.

These heaters consist of coils of the highest grade resistance wire, insulated by ceramic insulators in aluminized brackets.

All heaters except those used in 42S stack units are positioned on the incoming (preheat) side of the unit coil. On

42S stack units, the strip heater is located in the fan discharge on the leaving side of the coil.

SHEATHHEATERS — Used with Model 42V vertical units. These heaters consist of the highest grade resistance wire, centered in a

⁄2-in. diameter copper-plated steel sheath. The wire is insulated from the sheath by magnesium oxide powder packed around it. To increase the heater surface exposed to air, a 11⁄4-in. OD ﬁn of copper-plated steel is wound around the sheath in a continuous spiral that makes 5 turns per lineal inch. Sheath and ﬁn are permanently bonded together by copper brazing.

The heaters are positioned on the leaving (reheat) side of the unit coil. On special units with high efficiency motors, a strip heater will be installed in the fan discharge on the incoming (preheat) side of the unit coil.

Heater Electrical Data

1. Load voltage may be 120, 208, 240 or 277 volts. For unit

size and kW limitations, refer to the speciﬁc unit catalogs.

2. All heaters are single stage and single phase.

3. Unless a single power-source option is selected, the elec-

tric heat units require 2 separate power sources. With the single power-source option, only one line circuit need be brought into the unit. Fuse protection is added to the motor/ control circuit to protect these components. This is separate from the ﬁeld-furnished total unit overcurrent protection.

MODEL 42V VERTICAL UNIT WITH ELECTRIC SHEATH HEATER

MODEL 42C CEILING UNIT WITH ELECTRIC STRIP HEATER

REMOTE-MOUNTED CONTROLS Standard 3-Speed Switch —

This standard switch has 4 positions: OFF, HIGH, MEDIUM, and LOW. Switch has auxiliary contact that is energized when switch is in HIGH, MEDIUM or LOW position.

Some of the options common with the 3-speed switch are:

1. Unit-mounted switch on Furred-In VerticalModel. (Avail-

able as special order on Horizontal Models)

2. Switch without OFF position.

3. Key-operated switch.

Combination Thermostat/3-Speed Switch

(Packages 22-B, 22-D, 22-F, 22-H, 22-K*) — Thermostat and standard switch are mounted on a common decorative wall plate, suitable for installation in a 411⁄16-in. square junction box. Packages 22-A and 22-B include Model TC-126 2-pipe heating and cooling thermostat and automatic changeover switch (shipped separately for ﬁeld wiring and mounting).

Packages 22-C and 22-D include Model TC-126 thermo-

stat less automatic changeover switch wired for cooling only.

Packages 22-E and 22-F include Model TC-126 thermo-

stat, less automatic changeover, wired for heating only.

Package 22-G includes Model TH-126 4-pipe thermostat for sequenced heating and cooling, plus 3-speed switch. (For 4-pipe or total electric heat systems.)

Package 22-J is the same as 22-G except that 2 automatic changeover switches are shipped with package. (For auxiliary electric heat systems.)

Wall Thermostat, 2-Pipe (Packages 22-A through

22-F*) — Model TC-126 thermostat for heating and cooling, operates on line voltage. Action is SPDT. Temperature range is 50-90 F.

Packages 22-A and 22-B — Heating and cooling, includes one automatic changeover switch (shipped separately for ﬁeld wiring and mounting).

Wall Thermostat, 4-Pipe (Packages 22-G through

22-K*) — Model TH-126 thermostat is also used on 2-pipe system with electric heat. Heating and cooling are sequenced (automatic changeover) with 6 degree separation between HEATINGON and COOLING ON. T emperaturerange is 50 - 90 F.

Packages 22-G and 22-H — For 4-pipe and total electric heat systems.

Packages 22-J and 22-K — For auxiliary electric heat systems, includes 2 automatic changeover switches (shipped separately for ﬁeld wiring and mounting).

* Packages listed on current price pages.

Thermostat Electrical Data

(Pilot Duty — 125 VA)

VOLTS

120 5.8 34.8 5.8 34.8 240 4.9 29.4 4.9 29.4 277 4.1 24.6 4.1 24.6

HEATING COOLING

FLA LRA FLA LRA

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