Carrier 42 SERIES 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 Ta b 7 a 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 ST ANDARD WIRING P ACKAGES ............ 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 V alve Control, 2-Pipe ... 5 Therm[...]

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 temp[...]

ST ANDARD WIRING P ACKAGES IMPOR T ANT : W iring diagrams shown depict typical control functions. Refer to unit wiring label for spe- cific functions. Manual Fan Control — On all V ertical Cabinet units, the standard fan-speed switch is furnished unit-mounted and wired. On all V ertical Furred-In units and all Horizontal units, the switch is shi[...]

Thermostatic Fan Control, 2-Pipe System with Safety Cycle — This control is used for high humidity situations in which condensate problems can occur if fan is turned of f 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 [...]

ST ANDARD WIRING P ACKAGES (cont) Thermostatic 2-Pipe Auxiliary Electric Heat with V alve Control — This system, also called T wi- light or Intermediate Season electric heat, goes a long way towards solving the spring and fall control problems of 2-pipe systems. Y ou can run chilled water late into the fall, turn it on early in the spring and sti[...]

Thermostatic 2-Pipe T otal Electric Heat with- V alve Control — With this system, the complete heat- ing requirement for the space is provided by the electric heater; the water system is never changed over for heating. It is there- fore possible, just as with 4-pipe systems, to have heating or cooling at any time of the year . The fan runs contin[...]

ST ANDARD WIRING P ACKAGES (cont) Thermostatic V alve Control, 4-Pipe — The 4-pipe system provides the ultimate in economy and room tem- perature control. Both hot water and chilled water are avail- able at any time. Normally an automatic changeover thermostat is used, but a manual changeover thermostat is also suitable. T wo 2-way valves, two 3-[...]

ELECTRIC HEA T Application — Electric heaters are available for in-stallation on Carrier fan coil units in the following applications. TOT AL ELECTRIC HEA T — This system provides com- plete heating during the heating season; no boiler is re- quired. Heating and cooling are now available on an indi- vidual basis throughout the year with a 2-pip[...]

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 V ertical Model. (A vail- able as special o[...]

AL TERNA TE W ALL THERMOST A TS W all Thermostat (Honeywell Model T4039) with Manual 3-Speed Fan Switch and ON-OFF Switch T emperature range is approximately 55 to 95 F in 10° F increments from 75 F midpoint. Scale is marked warmer - cooler . Thermostat mounts in 4-in. square junction box or 2-ganged outlet boxes. SYSTEM MODEL P ACKAGE 2-Pipe Cool[...]

UNIT -MOUNTED CONTROLS OFF HI MED LO Standard 3-Speed Switch — Switch has OFF , HIGH, MED and LOW positions. Switch is also equipped with aux- iliary connection energized when switch is in HIGH, MED or LOW position. COMBINA TION THERMOST A T AND T OGGLE SWITCH Combination Thermostat/ON-OFF T oggle Switch (Package 24-R*) — Includes Model TF103 2[...]

T wo-Pipe Thermostat, Model TF103 — This single- pole, double-throw (SPDT) thermostat has snap-action con- tacts. The standard temperature range is 60 - 90 F . Four-Pipe Thermostat, Model TH104 — W ith this thermostat, heating and cooling are sequenced (automatic changeover) with 6 degree separation between HEA TING ON and COOLING ON. The stand[...]

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 e[...]

Hydronic Coil Arrangement FIELD PIPING CONNECTIONS* VERTICAL FLOOR UNITS — 42VB, VE, VF Pipe into cabinet end compartment (opening in bottom and back). VERTICAL FLOOR UNITS — 42V A, VC Pipe to external connections (no cabinet). CEILING UNITS (EXPOSED) — 42CG, CK, DE, DF Pipe through knock-outs in rear of cabinet to coil and valve package conn[...]

V AL VE P ACKAGES General — T able 1 lists acceptable pneumatic valves for 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 pac[...]

LEGEND For Fig. 1 Component Sizing — 1 ⁄ 2 9 nominal (for 5 ⁄ 8 9 OD copper tubing) or 3 ⁄ 4 9 nominal (for 7 ⁄ 8 9 OD copper tubing). Manual Air V ent — Standard component - Brazed into high point of hydronic cooling and/or heating coil circuit. Automatic Air V ent — Brazed into high point of coil circuit. Coil Connections (Positions[...]

V AL VE P ACKAGES (cont) T wo-W ay Motorized Control V alve The 2-way motorized valve motor drives valve open and a spring returns valve to normally closed position (no water flow with unit OFF). Supply connection at coil will be swage fit for field braze (standard) or union (option). Return connection at coil will be factory brazed if isolation[...]

Three-W ay Motorized Control V alve 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. W ater bypasses coil and flows directly to system return when unit is OFF. The aquastat (A) clips on supply line upstream from 3-way valve (as show[...]

V AL VE P ACKAGE ARRANGEMENTS 20[...]

LEGEND — Ball V alve — Ball V alve with Memory Stop — Gate Shut Off V alve — Balancing V alve — Circuit Setter — Motorized 2-W ay V alve — Motorized 3-W ay V alve * When aquastat is used for automatic changeover , bypass is re- quired as indicated by dashed line. NOTES: 1. Packages factory furnished and installed. 2. V alves are 5 ⁄[...]

V AL VE P ACKAGE ARRANGEMENTS (cont) LEGEND ITEM DESCRIPTION Pneumatic Control V alve, 2-Way Code 18(typical) -2* ( 1 ⁄ 2 -o r 5 ⁄ 8 -in. ODF tubing conn) or Code 18(typical) -3* ( 7 ⁄ 8 -in. ODF tubing conn) Pneumatic Control V alve, 3-Way Code 18(typical) -14* ( 1 ⁄ 2 -o r 5 ⁄ 8 -in. ODF tubing conn) or Code 18(typical) -5* ( 7 ⁄ 8 -i[...]

T able 1 — Acceptable Field-Furnished Pneumatic V alves MANUF ACTURER V AL VE NUMBER TYPE MODE SIZE (in.) (OD Male Flare) CAP ACITY (CV) RA TING HONEYWELL VP517A 3-W A Y MIXING 7 ⁄ 8 3.0, 4.0, 6.3 VP522A&B 3-W A Y SEQUENCING 5 ⁄ 8 or 7 ⁄ 8 1.6/2.5 or 2.5/3.5/4.0 VP526A 3-W A Y MIXING 5 ⁄ 8 1.6, 2.5 VP527A 2-W A Y N.O. 1 ⁄ 2 0.63, 1.[...]

PIPING COMPONENTS SYMBOL/SKETCH DESCRIPTION C V F ACTOR RA TING STEAM USE 1 ⁄ 2 3 ⁄ 4 PSI F 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). Sh[...]

SYMBOL/SKETCH DESCRIPTION C V F ACTOR RA TING STEAM USE 1 ⁄ 2 3 ⁄ 4 PSI F PRESSURE TEST PORT : Brass body 1 ⁄ 4 service 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. N/A N/A 400 210 NO GAG[...]

PIPING COMPONENTS (cont) SYMBOL/SKETCH DESCRIPTION C V F ACTOR RA TING STEAM USE 1 ⁄ 2 3 ⁄ 4 PSI F 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 rem[...]

SYMBOL/SKETCH DESCRIPTION C V F ACTOR RA TING STEAM USE 1 ⁄ 2 3 ⁄ 4 PSI F 2-W A Y MOTORIZED V AL VE: 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 electri[...]

C V F ACTOR vs W A TER PRESSURE DROP C V F ACTOR: The flow rate in gallons per minute (gpm) through a piping component when the pressure drop ( D P) in pounds per square inch (psi) across the component is 1.0 (psi). Pressure drop (ft-H 2 O) = 2.31 x psi (pressure drop) GRAPH EXAMPLE: D P for 2.0 gpm through a component with a C V of 1.0 is 4.0 psi[...]

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COPPER W A TER TUBE AND JOINT MA TERIAL PRESSURE RA TINGS JOINT MA TERIALS A 50-50 Lead-T in at 200 F Note 1 D 95-5 T in-Antimony at 200 F Note 2 B 50-50 Lead-T in at 150 F E 95-5 T in-Antimony at 150 F C 50-50 Lead-T in at 100 F F 95-5 Tin-Antimony at 100 F 1. Not recommended for high system water pressures. 2. Standard factory joint material. THE[...]

CORRECTION F ACTORS FOR GL YCOL (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 [...]

T able 2 — Standard Accessories and Options ST ANDARD ACCESSORIES AND OPTIONS UNIT SERIES — 42 Ceiling — Horizontal Floor — V ertical Ducted — Horizontal Belt Drive Stack — V ertical CA CE CG CK CF V A VB VF VC VE VG DA DC DE DF DD BH SG SH SJ CABINET CHANGES Front Panel, 16 Gage •• Extended Cabinet when electric heat or valves are [...]