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

ALTERNATE WALL THERMOSTATS WallThermostat (Honeywell Model T4039) with

Manual 3-Speed Fan Switch and ON-OFF Switch

Temperature range is approximately 55 to 95 F in 10° F increments from 75 F midpoint. Scale is marked warmercooler. Thermostat mounts in 4-in. square junction box or 2-ganged outlet boxes.

SYSTEM MODEL PACKAGE

2-Pipe Cooling Only T4039B* 23-05 2-Pipe Heating Only T4039F* 23-03 2-Pipe Heating/Cooling† T4039F* 23-01 2-Pipe w/Total Electric Heat T4039M** 23-07 4-Pipe Heating/Cooling T4039M** 23-07 2-Pipe w/Auxiliary Electric Heat†† T4039M** 23-09

*Fan off breaks cooling circuit and fan.

†Includes one remote-mounted changeover on unit

**Fan off breaks both heating/cooling circuits and fan. †† Includes 2 remote-mounted changeovers on unit. NOTE: All above packages include thermostat, ON-OFF switch and HIMED-LOW switch.

Thermostat Electrical Ratings (Amperes)

VOLTAGE NORMAL IN-RUSH

120V AC 0.32 1.00 240V AC 0.16 0.50 277V AC 0.14 0.43

VOLTAGE FULL LOAD LOCKED ROTOR

120V AC 5.50 33.0 240V AC 2.75 16.5 277V AC 2.40 14.4

Thermostat (Valve Load)

Fan Switch

MED

OFF

WARM

FAN

COOL

HONEYWELL MODEL T4039

THERMOSTAT

WallThermostat (Sunne Model154) with Manual 3-Speed Fan Switch and ON-OFF Switch

Temperature range is approximately 55 to 95 F in 10° F increments from 75 F midpoint. Scale is marked warmercooler. Thermostat mounts in 4-in. square junction box or 2-ganged outlet boxes.

SYSTEM MODEL PACKAGE

2-Pipe, Cooling Only TC154-004 23-06 2-Pipe, Heating Only TC154-004 23-04 2-Pipe, Heating/Cooling

with Auto. Changeover*

2-Pipe, Heating/Cooling

with Manual Changeover

2-Pipe, Cooling with Total Electric

Heat and Auto. Changeover.

2-Pipe, Cooling with Total Electric

Heat and Manual Changeover

2-Pipe, Heating/Cooling with Auxiliary

Electric Heat and Auto. Changeover†

2-Pipe, Heating/Cooling with Auxiliary

Electric Heat and Manual Changeover

4-Pipe, Heating/Cooling with

Auto. Changeover

4-Pipe, Heating/Cooling with

Manual Changeover

*Includes one remote mounted changeover on unit.

†Includes 2 remote mounted changeovers on unit. NOTE: All of the above packagesincludethermostat, ON-OFF switch and

HI-MED-LOW switch.

Thermostat and Fan Switch Electrical Ratings

VOLTAGE

125V AC 5.8 34.8 125 VA 240V AC 4.9 29.4 125 VA 277V AC 4.1 24.6 125 VA

INDUCTIVE

FLA LRA

TC154-004 23-02 TC154-014 23-12 TC154-003 23-08 TC154-014 23-14 TC154-003 23-10 TC154-014 23-16 TC154-003 23-08 TC154-014 23-14

PILOT DUTY

HEAT

OFF

COOL

MED

F A N

SUNNE MODEL 154

THERMOSTAT

UNIT-MOUNTED CONTROLS

OFF

MED

Standard3-Speed Switch — Switch has OFF, HIGH,

MED and LOW positions. Switch is also equipped with auxiliary connection energized when switch is in HIGH, MED or LOW position.

MED

OFF

COMBINATION THERMOSTAT AND TOGGLE SWITCH

CombinationThermostat/ON-OFF ToggleSwitch

(Package 24-R*) — Includes Model TF103 2-pipe thermostat and toggle switch. Used as special fan control for cycling fan from HIGH to LOW on cooling; from LOW to OFF on heating.

Combination Thermostat/3-Speed Switch (Pack-

ages 24-L, M, N, Pand Q*) — Thermostat and standard switch are unit mounted in a common electrical junction box.

Package 24-L includes Model TF103 2-pipe thermostat and standard 3-speed switch, plus automatic changeover for mounting on supply pipe.

Package 24-M and 24-N include Model TF103 2-pipe thermostat and standard 3-speed switch only.

Package 24-P includes Model TH104 4-pipe thermostat and standard 3-speed switch. May be used on 4-pipe systems with electric valves or on 2-pipe systems with total electric heat.

Package 24-Q includes Model TH104 4-pipe thermostat, standard 3-speed switch and 2 automatic changeover switches for 2-pipe systems with auxiliary electric heat.

* Packages listed on current price pages.

T wo-PipeThermostat,Model TF103 — This single-

pole, double-throw (SPDT) thermostat has snap-action contacts. The standard temperature range is 60 - 90 F.

Four-Pipe Thermostat,Model TH104 — With this

thermostat, heating and cooling are sequenced (automatic changeover) with 6 degree separation between HEATING ON and COOLING ON. The standard temperature range is 60-90F.

Thermostat Electrical Data

(Pilot Duty — 125 VA at 120-277 v)

ITEM VOLTS FLA LRA

TF103

and

TH104

120 16 80 240 12 60 277 10 50

Automatic Changeover (Summer-Winter Switch) —

The automatic-changeover thermostat is a single-pole doublethrow (SPDT) thermal switch in a moistureproof and dustproof enclosure. Thermostat mechanism and lead ends are hermetically sealed in a polypropylene enclosure with epoxy resin. Device clamps on coil supply pipe with end snap-on clip.

The set point temperatures are factory set. When water temperature rises above 80 F (approximately), the thermostat switches to the winter cycle. When water temperature drops below approximately 70 F, the thermostat switches to the summer cycle. Switch reset is automatic.

STEMCO

416-79

L80 8220

AUTOMATIC CHANGEOVER (Summer-Winter) SWITCH

BASIC DEFINITIONS

Unit Hand — When facing the supply air outlet from the front of the unit (air blow-

ing in your face), your right hand will be the right hand side of the unit and your left hand the left hand side of the unit.

Same End Connection (2 Pipe or 4 Pipe) — All piping connections are on the same end (side) of the unit. Controls and electrical connection will be on the end (side) opposite the piping connection.

Standard 2-pipe units will be the same end connection.

NOTE:

Piping determines the hand of the unit.

Opposite End Connection (4-Pipe Option) — Hot water (HW) piping connections and electrical will be on the end (side) opposite the chilled water (CW) and drain connections.

NOTE:

Chilled water piping determines the hand of the unit.

Valve Packages For 2-Pipe Systems — Valve packages for standard 2-pipe units are piped for same end connection (L.H. or R.H.).

Valve Packages for 4-Pipe Systems - Select 2 valve packages per unit. NOTE:

Hot water valve package requirements may not be the same as chilled water valve package!

Hydronic Coil Arrangement

FIELD PIPING CONNECTIONS*

VERTICALFLOOR UNITS — 42VB, VE, VF

Pipe into cabinet end compartment (opening in bottom and back).

VERTICAL FLOOR UNITS — 42VA, VC

Pipe to external connections (no cabinet).

CEILING UNITS (EXPOSED) — 42CG, CK, DE, DF

Pipe through knock-outs in rear of cabinetto coil and valve package connections.

CEILING UNITS (CONCEALED) — 42CA, CE, CF, DA, DC

Pipe to connections extending from end of unit.

VERTICAL UNITS — 42DD

Pipeto stub connectionsextending from side of unit.

HORIZONTAL AIR HANDLERS (BELT DRIVE) — 42BH

Pipe to stub connections extending through side of unit.

Valvepackages arenot factory supplied with these units.

WALL UNITS, FURRED-IN

Pipe to stub connections at the side of unit. or into optional piping compartment. Op-

tionalpiping compartmentis required if valves are factory installed. Factory installed valve packageis limited toone 2-way or 3-way motorized valve and 2 hand valves.

*Locationof ﬁeld pipingconnections will vary depending on number of coil rows on factory-

supplied coil or arrangement of factory-supplied valves.

VALVE PACKAGES General —

installation on 42 series fan coil units. There are limitations on physical size of pneumatic valves, quantity and type of matching components, required control interface. See Fig. 1 for symbols and placement of valves.

Consult factory before ordering any special valve pack-

age components that are not covered in this book.

Table 1 lists acceptable pneumatic valves for

Valve packages are shipped with the units or in unit cartons. Valve packages include belled ends for ﬁeld soldering to coil connections.

All factory-furnished cooling valve packages are arranged to position as much of the package as possible over an auxiliary drain pan or drip lip. This helps minimize ﬁeld piping insulation requirements.

Fig. 1 — Symbol And Placement Of Valves

LEGEND For Fig. 1

Component Sizing —

⁄29 nominal (for5⁄89 OD copper tubing) or3⁄49 nominal (for7⁄89 OD copper tubing).

Manual Air Vent — Standard component - Brazed into high point of hydronic cooling and/or heating coil circuit. Automatic Air Vent — Brazed into high point of coil circuit. Coil Connections (Positions A & B) — When isolation valve only is added to supply or return line, the isolation valve

will be factory brazed to the coil stub-out. Addition of any other component or connection to the supply or return line will change the respective coil connection(s) to one of the following:

STANDARD: Swage ﬁtting for ﬁeld braze. OPTION: Union(s) added by factory for ﬁeld connection.

Service Fittings (PositionsC&D)—Optional ﬁttings for attaching pressure/temperature sensing devices to obtain pressure drop or temperature differential accross coil. Used with ball valve or balance valve where extremely accurate water ﬂow balancing is required.

GAGE COCK: Pressure test only - In supply and return lines.

PRESSURE TEST PORT: Pressure test only - In supply and return lines.

INSERTION TEST PORT: Pressure/Temperature test - In supply and return lines.

Water Flow Balancing (Positions E, F, & H) — Only one device per total valve package to be used for balancing water ﬂow through the coil. When isolation valve (ball valve or ball valve with memory stop at position H) is used for water ﬂow balancing, do not specify additional balancing device at position E or F. When balancing device is speciﬁed at position E or F, isolation valve does not require balancing feature at position H (See exception, 3-way motorized valve).

CIRCUIT SETTER: May serve as a positive shut-off valve in lieu of isolation valve at position H (check service requirements).

BALANCING VALVE: Check speciﬁcations for service ﬁtting requirements.

FIXED FLOW: No balancing required - When there are more devices on the supply line of the valve package than on the return line, the factory may move this device to position E to ﬁt valve package within allotted space. Consult your factory representative to match the available ﬁxed ﬂow valve to your job requirements.

Strainer (Position G) — Does not include blow down ﬁtting and should not be used in lieu of main piping strainers. Isolation Valves (PositionsH&J)—Normally requires one each on supply and return line (see exception under

circuit setter). When position H is used for balancing (ball vall or ball valve with memory stop), check speciﬁcations for service valve requirements.

GATE VALVE: Shut-off only - Do not use for balancing.

BALL VALVE: Shut-off/balance - No memory stop.

BALL VALVE WITH MEMORY STOP: Shut-off/balance - Memory stop allows re-opening to balance point after usage as a shut-off.

VALVE PACKAGES (cont) Two-Way Motorized Control Valve

The 2-way motorized valve motor drives valve open and a spring returns valve to normally closed position (no water ﬂow with unit OFF).

Supplyconnection at coil will beswage ﬁt forﬁeld braze (standard) or union (option). Return connection at coil will be factory brazed if isolation valve only. Addition of anyother component willrequire swage ﬁt for ﬁeld braze or optional union connection.

Check job speciﬁcations for system pressure, pressuredrop limitations and ﬂow rateprior to selectingvalve package components or valve package size ( etc.).

2-PIPE SYSTEM (One ValvePackage) or 4-PIPE SYSTEM (Two Valve Packages) Application:

• 2 Pipe - Hydronic Heating Only

• 2 Pipe - Hydronic Cooling Only

• 2 Pipe - Hydronic Cooling with Total Electric Heat

• 4 Pipe - Hydronic Cooling and Heating

NOTE:A

⁄4-in.bypass line is included inthe piping packagewhen a 2-way valve is speciﬁed witha control package containing an automatic changeover device.

⁄29,3⁄49,

Two-Way Motorized Control Valve with Aquastat Bleed Bypass Line

The 2-way motorized valve motor drives valve open and a spring returns valve to normally closed position (no water ﬂow through coil with unit OFF).

The aquastat bleed bypass bleeds a small amount of water from supply to return when control valve is closed (requiredfor systemwater temperature sensing by aquastat). Aquastat (A) clips on supply line upstream from aquastat bleed bypass (as shown at right). It senses system water temperature to prevent cooling operation withhot water in system piping or heatingoperation with chilled water in system piping. Additional aquastat requiredto lock out the optionalauxiliary electricheat when hot water in system.

Supply and return connections at coil will be swage ﬁt for ﬁeld braze (standard) or unions (option).

Check job speciﬁcations for system pressure, pressuredrop limitations and ﬂow rateprior to selectingvalve package components or valve package size ( etc.).

2-PIPE SYSTEM (One Valve Package) Application:

• 2 Pipe - Hydronic Cooling and Heating

• 2 Pipe - Hydronic Cooling and Heating with Auxiliary

Electric Heat

NOTES: Additional aquastat required as noted above.

⁄29,3⁄49,

Three-Way Motorized Control Valve

On the 3-way motorized valve ﬂow is normally closed to coil and open to system return. Motor closes bypass ﬂow to system return while opening ﬂow through coil. Waterbypasses coil and ﬂows directly to system return when unit is OFF.

The aquastat (A) clips on supply line upstream from 3-way valve (as shown above). It senses system water temperature to prevent cooling operation with hot waterin system piping or heating operation withchilled waterin system piping.Aquastat(s) requiredfor 2-pipe cooling and heating with automatic changeover control and/or auxiliary electric heat.

A bypass balancing valve may be speciﬁed in the bypass line to permit equal ﬂow balancing.

Supply and return connections at coil will be swage ﬁt for ﬁeld braze (standard) or unions (option).

Check job speciﬁcations for system pressure, pressuredrop limitations and ﬂow rateprior to selectingvalve package components or valve package size ( etc.).

2-PIPE SYSTEM (One ValvePackage) or 4-PIPE SYSTEM (Two Valve Packages) Application:

• 2 Pipe - Hydronic Heating Only

• 2 Pipe - Hydronic Cooling Only

• 2 Pipe - Hydronic Cooling with Total Electric Heat

• 2 Pipe - Hydronic Cooling and Heating

• 2 Pipe - Hydronic Cooling and Heating with Auxiliary

Electric Heat

• 4 Pipe - Hydronic Cooling and Heating

⁄29,3⁄49,

No Motorized Control Valve

When isolation valves only are speciﬁed, they will be brazed to the coil stub-outs.

Check job speciﬁcations for system pressure, pressuredrop limitations and ﬂow rate prior toselecting speciﬁc components or valve package size (

2-PIPE SYSTEM ONLY (One Valve Package) Application:

• 2 Pipe - Hydronic Heating Only

• 2 Pipe - Hydronic Cooling Only NOTES:

1. Continuous water ﬂow, chilled water or hot water.

2. Not recommended for high humidity applications.

3. Not recommended with unit-mounted thermostat on

vertical units (except package R).

4. The addition of any other component(s) will require

swage ﬁtting for ﬁeld braze or optional union conection.

⁄29,3⁄49, etc.).

VALVE PACKAGE ARRANGEMENTS

LEGEND

— Ball Valve — Ball Valve with Memory Stop — Gate Shut Off Valve — Balancing Valve — Circuit Setter

— Motorized 2-Way Valve

— Motorized 3-Way Valve

* When aquastat is used for automatic changeover, bypass is re-

quired as indicated by dashed line.

NOTES:

1. Packages factory furnished and installed.

2. Valves are

3. If an automatic ﬂow control valve is added, it will be located on supply line between shutoff valve and coil (or motorized control valve, if supplied).

4. Packages are listed on current price pages.

⁄8-in. ODS unless otherwise speciﬁed.

VALVE PACKAGE ARRANGEMENTS (cont)

LEGEND

ITEM DESCRIPTION

Pneumatic Control Valve, 2-Way

Code 18(typical) -2* ( Code 18(typical) -3* (7⁄8-in. ODF tubing conn)

Pneumatic Control Valve, 3-Way

Code 18(typical) -14* (1⁄2-or5⁄8-in. ODF tubing conn) or Code 18(typical) -5* (7⁄8-in. ODF tubing conn)

*Valve packages listed on current price pages. NOTES:

1. Pneumatic valves are ﬁeld furnished for factory installation.

2. To simplify valve installation and maintenance, cabinet units with 4-pipe coils must have opposite-end connections.

3. Alternate designations for the terms N.O., N.C. and RETURN on 3-way valves are as follows:

Manufacturer N.O. N.C. Return

Barber-Coleman B A AB Honeywell B A AB Johnson Service N.O. N.C. C Powers B U C

4. All orders entered must include a job speciﬁc piping diagram OR reference can be made to standard arrangements 18-A through 18-E as shown here.

5. Hand valves shown in Arrangements 17-A through 17-F may be included with pneumatic valves. These arrangements should also be shown on piping diagrams submitted.

⁄2-or5⁄8-in. ODF tubing conn) or

Table 1 — Acceptable Field-Furnished Pneumatic Valves

MANUFACTURER VALVE NUMBER TYPE MODE

VP517A 3-WAY MIXING

VP522A&B 3-WAY SEQUENCING

VP526A 3-WAY MIXING

HONEYWELL

VP527A 2-WAY N.O. VP513A 2-WAY N.O. VP513B 2-WAY N.C. VP531A 2-WAY N.O.

V4332 3-WAY MIXING V4334 3-WAY MIXING

JOHNSON

SERVICE

V4440 3-WAY SEQUENCING V4440 3-WAY SEQUENCING V3766 2-WAY N.O. V3966 2-WAY N.C.

VK9312 3-WAY MIXING

BARBER-

COLEMAN

VK9332 3-WAY SEQUENCING VK9212 2-WAY N.O. VK9222 2-WAY N.C.

VP656-0011, 10, 09 3-WAY MIXING

VP658-0004, 5 3-WAY DIVERTING

MCC

POWERS

VP658-0050, 51 3-WAY SEQUENCING

VP658-0004, 5 2-WAY N.O. VP656-0002, 4 2-WAY N.O.

VP656-0012 2-WAY N.C. 2582 (V8200) 2-WAY N.O. 2583 (V8300) 3-WAY MIXING 2561 (V6101) 2-WAY N.C.

ROBERTSHAW

2561 (V6102) 2-WAY N.O. 2563 (V6300) 3-WAY MIXING 2563 (V6301) 3-WAY MIXING

2569 (V6900, 01) 3-WAY SEQUENCING

CV— See Note 5. N.C. — Normally Closed N.O. — Normally Open OD — Outside Diameter

NOTES:

1. This reference table lists valves that are acceptable because of capacityand piping connection type.Actualvalve selection for speciﬁc mode (N.O. or N.C.) and capacity rating (CV) to meet jobsite conditions must be made by ﬁeld personnel.

2. Valve size ( ing size. Use price page package 18-2 or 18-4 for selecting OD valves. Use price page package 18-3 or 18-5 for7⁄8-in. OD valves.

3. The and 42V (vertical) room fan coil units. The7⁄8-in. OD valves are recommended for use on 42D (ducted) units.

4. Flare connections are 45° SAE ﬂare with body threaded for standard ﬂare nuts.

⁄2-,5⁄8-, and7⁄8-in. OD) designates the matching tub-

⁄2-in. or5⁄8-in.

⁄2-in. and5⁄8-in. OD valves are usedprimarily on 42C (ceiling)

SIZE (in.)

(OD Male Flare)

⁄

⁄8or7⁄

⁄

⁄8or7⁄

⁄

⁄8or7⁄8(ODS) 1.6, 2.6, 3.3

⁄

⁄2,5⁄

⁄

⁄2,5⁄8,7⁄

5. The CVcapacity rating is the gpm ﬂow through a valve at 1.0 psi pressure drop.

EXAMPLE: A 2.5 CVvalve has a ﬂow of 2.5 gpm at 1.0 psi pressure drop.

As ﬂow changes, pressure drop can be determined by the formula:

Actual gpm

6. Restrictions imposed by limitedpiping enclosures often require that thevalve manufacturer’s recommendation for obstruction free service clearances be waived. Service/isolation valves normally speciﬁed will permit removal ofthe entire pneumatic valve for ﬁeld service if necessary.

7. Certain combinations of pipingaccessoriesand control valves have proven unacceptable in the past, therefore the factory must reserve the right of review for ﬁnal acceptance.

8. Consult factory on all applications involving valves with thermostatic actuators or built in pneumatic thermostats.

CAPACITY

(CV) RATING

3.0, 4.0, 6.3

1.6/2.5 or 2.5/3.5/4.0

1.6, 2.5

0.63, 1.0, 1.6

2.5, 4.0

1.0, 1.6, 2.5

1.2, 2.0

4.7

1.4, 2.4

4.1, 4.7

1.0, 1.7, 3.2

1.7, 3.2

2.0, 4.0

1.7, 2.4, 4.0

0.4, 1.3, 2.2, 3.3

1.5, 2.5

2.5

1.5, 2.5

1.0, 2.5

0.9, 2.1

2.1

0.4, 0.6, 1.0, 1.6

1.6

1.2, 2.2, 4.1

1.0, 1.6

1.6

2.5

.6, 1.0, 1.1, 1.6,

2.5, 3.2, 2.4, 4.0, 4.5

PIPING COMPONENTS

SYMBOL/SKETCH DESCRIPTION

MANUAL AIR VENT: Threaded brass

needle valve with screwdriver slot for adjustment.

Application - Body brazed into high point of heating and cooling coils for bleeding air from coil. Standard item on all hydronic coils (not used on steam or DX coils). Should not be used in lieu of main system air vents.

AUTOMATIC AIR VENT: Nickel plated brass valve, ﬁber-disc type, with positive shut-off ballcheck and quick vent feature via knurled vent screw.

Application - Optional replacement for manual air vent. Automatically passes minute quantities of air through the ﬁber discs which expand upon contact with water, completely sealing the valve. As air accumulates, the ﬁber discs dry and shrink, repeating the cycle. Not recommended for removing large quantities of air encountered during initial start-up or subsequent draining and reﬁlling. Should not be used in lieu of main system air vents.

SWAGE: Copper tube end expanded to accept a copper tube of the same size for factory or ﬁeld brazing.

Application - Used where possible for all tubing joints for best joint integrity.

(*) See page 30 for ratings of different

joining materials and operating temperatures.

UNION: Combination wrought copper/cast brass union assembly, solder by solder.

Application - Used for quick connect (and disconnect) of valve package components to minimize ﬁeld labor and facilitate servicing of unit.

(*) See page 30 for ratings of different

joining materials and operating temperatures.

INSERTION TEST PORT: Brass body valve for acceptance of test probe (up

⁄8in. diameter).

Application - Installed on one (or both) sides of the coil to allow for temperature or pressure sensing. Used for close tolerance water balancing and service analysis.

CVFACTOR RATING

⁄

PSI F

STEAM

USE

N/A N/A 400 100 NO

N/A N/A 125 240 NO

N/A N/A

300

(*)

300

(*)

200

(*)

200

(*)

YES

N/A N/A 250 250 NO

SYMBOL/SKETCH DESCRIPTION

PRESSURE TEST PORT: Brass body

⁄4service access ﬁtting with

removable depressor type core. Application - Installed on both sides of

the coil to allow for pressure sensing. Attach pressure gages to facilitate close tolerance water balancing.

GAGE COCK: Brass shut-off valve

with

⁄4FPT ﬁtting for attachment of

pressure gages. Application - Installed on both sides of

the coil to allow for pressure sensing. Attach pressure gages to facilitate close tolerance water balancing. May be used in bleed bypass line to regulate water ﬂow.

CIRCUIT SETTER: Variable water

B+G

ﬂow balancing valve with manual adjustment knob, pointer, percent-open scale, memory stop and integral pressure read-out ports.

Application - Used for close tolerance water ﬂow balancing. Positive shut-off ball valve feature allows usage as combination balancing and shut-off valve.

BALANCE VALVE: Variable water ﬂow manual balancing valve with screwdriver slot adjustment screw.

Application - Often used in conjunction with test port ﬁttings for water ﬂow balancing. Balance by temperature differential or coil pressure drop (check speciﬁcations for service ﬁttings required if balancing by pressure drop). May be used in 3-way valve bypass line to permit equal ﬂow balancing.

FLOW SETTER: Variable water ﬂow manual balancing valve with screwdriver slot adjustment and direct gpm read-out sight glass.

Application - Used for water ﬂow balancing (8.0 gpm maximum).

FIXED FLOW VALVE: Spring and insert type (non-adjustable).

Application - Used for water ﬂow balancing. Valve automatically adjusts the ﬂow to within 10% of set point. Not available for ﬂow rates above 8 gpm.

FIXED FLOW VALVE: Flexible oriﬁce

HAYES

type (non-adjustable). Application - Used for water ﬂow

balancing. Valve automatically adjusts the ﬂow to within 10% of set point. Requires 15 psi (35 ft) of additional pump head for proper operation.

CVFACTOR RATING

⁄

PSI F

N/A N/A 400 210 NO

N/A N/A 200 250 N/A

1.95 4.15 200 250 NO

3.0 8.9 150 200 NO

2.2 5.4 125 210 NO

Valve oriﬁce size determines C

factor. The oriﬁce of these ﬁxed ﬂow

125 240 NO

valves changes as ﬂow is regulated. As the water pressure increases, the oriﬁce size decreases, thereby automatically limiting the ﬂow

150 160 NO

rate to the speciﬁed gpm (+/210%).

STEAM

USE

PIPING COMPONENTS (cont)

SYMBOL/SKETCH DESCRIPTION

STRAINER: Y-type body with

50 mesh stainless steel screen. Application - Used for removal of small

particles from system water during normal system operation. Should not be used in lieu of main system strainers. Strainer screen may have to be removed during initial high pressure system ﬂushing during start-up. Screen should be removed and cleaned per normal maintenance schedule (provisions for strainer blow-down not provided).

GATE VALVE: Manual shut-off valve. Application - Used for unit isolation

during system ﬂushing, servicing, etc. Do not use for water balancing.

GLOBE VALVE: Standard pattern, manual shut-off and throttling valve.

Application - Used for unit isolation. Not recommended for high ﬂow rates due to relatively high pressure drop.

COMPRESSION STOP VALVE:

Manual shut-off valve. Application - Used for unit isolation

during system ﬂushing, servicing, etc. Not recommended for high ﬂow rates due to relatively high pressure drop.

BALL VALVE: Manual balance and shut-off valve.

Application - Used for unit isolation and water ﬂow balancing. Without memory stop feature water balance point must be marked by installer (if necessary). Check speciﬁcations for service ﬁttings required when used for water balancing.

BALL VALVE WITH MEMORY STOP:

Manual balance and shut-off valve. Application - Used for unit isolation

and water ﬂow balancing. The adjustable memory stop feature allows return to the balance point after shut-off. Check speciﬁcations for service ﬁttings required when used for water balancing.

CVFACTOR RATING

⁄

9.0

Clean

⁄

19.0

Clean

PSI F

400 250 N/A

STEAM

USE

19.8 36.0 200 200 NO

1.8 3.9 200 200 NO

2.3 5.4 150 200 NO

4.0 7.5 400 200 YES

4.0 7.5 400 200 N/A

SYMBOL/SKETCH DESCRIPTION

2-WAY MOTORIZED VALVE: Electric

2-position ﬂow control valve (open/closed). Normally-closed body with manual override lever. Installed in supply line to unit.

Application - All standard control and valve packages are based upon normally-closed valves (valve electrically powered open and closed by spring return when electric power removed). Manual override lever allows valve to be placed in the open position for secondary (unit) ﬂushing, constant water ﬂow prior to start-up, etc. Manual override is automatically disengaged when valve is electrically activated. Consult factory for

normally-open valve applications. 3-WAY MOTORIZED VALVE: Electric

2-position ﬂow control valve (closed to coil/open to bypass or open to coil/ closed to bypass). Normally-closed with manual override lever. Installed in supply line to unit.

Application - Same comments as 2-way motorized valve except with manual override lever engaged the valve is open to both ports and water ﬂow will take the path of least resistance through the valve package (not necessarily 100% through the coil).

2-WAY PNEUMATIC VALVE:

Pneumatic operated 2-way control valve.

Application - Speciﬁed and supplied by others when required as part of a factory-assembled valve package. See Table 1 for approved listing of pneumatic valves suitable for installation on various unit models.

3-WAY PNEUMATIC VALVE:

Pneumatically operated 3-way control valve.

Application - Speciﬁed and supplied by others when required as a part of a factory-assembled valve package. See Table 1 for approved listing of pneumatic valves suitable for installation on various unit models.

AQUASTAT: Water temperature sensing electrical switch.

Application - Clips directly on nominal

⁄29 or3⁄49 copper tubing for

size water temperature sensing. Must be correctly located for proper control operation.

NOTES:

1. Motorized 2-way valves have a maximum close-off differential of 25 psi.

2. Motorized 3-way valves have a maximum close-off differential of 10 psi.

FACTOR RATING

⁄

PSI F

2.3 2.3 300 200

5.0 5.0 SERVICE

300 200 N/A

2.8 2.8

BYPASS

SPECS VARY WITH SUPPLIER

STEAM

USE

YES

PSI

MAX.

CVFACTOR vs WATER PRESSURE DROP

CVFACTOR:

The ﬂow rate in gallons per minute (gpm) through a piping component when the pressure drop (DP) in pounds per square inch (psi) across the component is 1.0 (psi).

Pressure drop (ft-H

O) = 2.31 x psi (pressure drop)

GRAPH EXAMPLE:

DP for 2.0 gpm through a component with a C

of 1.0 is 4.0 psi x 2.31 = 9.24 ft-H2O

FORMULA EXAMPLE:

DP (ft-H2O) =

(gpm)

)

x 2.31 =

(2.0) (1.0)

x 2.31 = 9.24 ft-H2O

TOTAL PRESSURE DROP is the Sum of the pressure drop of all piping and components in the water ﬂow path.

COPPER WATER TUBE AND JOINT MATERIAL PRESSURE RATINGS

JOINT MATERIALS

A 50-50 Lead-Tin at 200 F B 50-50 Lead-Tin at 150 F E 95-5 Tin-Antimony at 150 F C 50-50 Lead-Tin at 100 F F 95-5 Tin-Antimony at 100 F

Note 1

D 95-5 Tin-Antimony at 200 F

Note 2

1. Not recommended for high system water pressures.

2. Standard factory joint material.

THE ABOVE CHART IS FOR REFERENCE ONLY: Check all system component pressure ratings (coils, valves, pumps, etc.) and any applicable local or national piping codes prior to specifying system pressure rating.

CORRECTION FACTORS FOR GLYCOL (Equivalent water ﬂow method for all 42 Series Models)

This method allows you to calculate cooling and heating performance without adjusting capacities for glycol concentration.

After completing the standard selection procedure including water ﬂow rates, use the correction multiplier shown below to determine new (equivalent) ﬂow rates required for the speciﬁed glycol concentration.

EXAMPLE:

COOLING PERFORMANCE REQUIRES 3.0 gpm of 100% WATER.

What ﬂow rate of 30% glycol by voume will be required to match the cooling performance? Referring to the chart above, you will note that the cooling ﬂow rate multiplier for 30% glycol is 1.14.

100% WATER (3.0 gpm) x 1.14 = 3.42 gpm of 30% GLYCOL (EQUIVALENT FLOW RATE)

What will the new pressure drop be for 3.42 gpm of 30% glycol? Referring to the chart above, you will note that the cooling pressure drop multiplier for 30% glycol is 1.27.

(A) Obtain pressure drop for 3.42 gpm of 100% water. (B) Multiply (A) times 1.27 to obtain pressure drop for 3.42 gpm of 30% glycol.

Table 2 — Standard Accessories and Options

STANDARD ACCESSORIES

AND OPTIONS

CABINET CHANGES

Front Panel, 16 Gage •• Extended Cabinet when electric

heat or valves are installed

Valve Compartment Extension, 10 in. • Stamped Toe Space Return Grille ••

CLEANABLE FILTERS ••••••••• •••• • • • • COILS

3-Row (2-row cooling, 1-row heating) •• 3-Row (high capacity) •• 4-Row (3-row cooling, 1-row heating) •••••••• • • • 4-Row (high capacity) ••••Std••• StdStdStdStdStdStd • • • 5-Row (4-row cooling, 1-row heating) •••••••• ••••• • • • • 5-Row (3-row cooling, 2-row heating) •••••••• • • • 6-Row (4-row cooling, 2-row heating) ••••• • 6-Row (high capacity) ••••• • 7-Row (6-row cooling, 1-row heating) •••• • 8-Row (6-row cooling, 2-row heating) •

DAMPERS

Manual — Adjustable through return

air opening

Manual Adjustment, remote mounted ••• Manual — Rear opening with

sliding damper — not ﬁltered

Outdoor Air Connection (6 in.),

with ﬁlter and with or without damper ••••

Damper, Linkage and Motor wired to

auxiliary contact of 3-speed switch

DECORATIVE COLORS

(See Carrier Fan Coil Paint

Selector Guide)

DISCHARGE GRILLES

Stamped Front Discharge • • Std Double Deﬂection, installed •••• • • Double Deﬂection, shipped

loose

Reverse stamped for vertical discharge •

DRAIN PANS

Auxiliary Drip Lip — Included with

2- or 3-way motorized valves

Tell-Tale, with 2nd drain connection ••••• •••• Sleeved Steel Extension •••••

ELECTRIC HEATERS

Nichrome Wire Strip Heater ••••• ••••• • • • Sheath Type Heater •••••

LEVELING LEGS

(maximum adjustment,

MOTORS

115-1-60 PSC Std Std Std Std Std Std Std Std Std Std Std Std Std Std Std Std Std Std 208-1-60 PSC •••••••••• ••••• • • • 240-1-60 PSC •••••••••• ••••• • • • 277-1-60 PSC •••••••••• ••••• • • • 115/230-1-60 • 220/440-3-60 •

220-1-50 PSC •••• ••••• ••••• • • • MOTOR QUICK-DISCONNECT PLUG •••••••••• ••••• • • • OUTSIDE-AIR WALL BOX ••• RETURN AIR GRILLE, shipped loose •• • ••• • TAMPERPROOF LOCKS (Camloc)

Access Panels •• •• • •

Access Doors •• • VALVE PACKAGES ••••••••••Limited ••••• • • • WALL PANELS (for recessed unit) • WIRING PACKAGES ••••••••••Limited ••••• • • •

⁄4in.)

Ceiling — Horizontal Floor — Vertical Ducted — Horizontal

CA CE CG CK CF VA VB VF VC VE VG DA DC DE DF DD BH SG SH SJ

•••

•• •• • • •

•• ••• • • •

••••• ••••

•••••

UNIT SERIES — 42

••

Belt

Drive

Stack — Vertical

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 32 6-90 Replaces: 42-2XC

Carrier 42 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual