Carrier 33CS Installation And Operating Instructions Manual

Also see for 33CS: Owner's manual Owner's manual Operating guide Installation, start-up, and operating instructions Installation, start-up, and operating instructions

Contents

Carrier 33CS Installation And Operating Instructions Manual Manual pdf 2 page image

2b. Disconnect wires from existing thermostat. Do notallow wires to fall back into the wall. As each wireis disconnected, record wire color and terminalconnection.c. Discard or recycle old thermostat.NOTE: Mercury is a hazardous waste and must bedisposed of properly.3. Thermostat can be mounted directly to the wall or ontothe unit when required. See Fig. 1. An accessory wallmounting plate is available when an existing hole in thewall is too large for the thermostat or when mounting to ajunction box in the wall (the thermostat will not com-pletely cover a 2 x 4-in. junction box).4. If mounting plate is being used, install mounting plate onwall or junction box. Mounting plate consists of two piec-es: the metal mounting plate (see Fig. 2A) and the plasticmounting plate (see Fig. 2B). The standard mountingplate will cover a 2 x 4-in. or 4 x 4-in. junction box.Accessory mounting plates of different sizes are alsoavailable. Accessory mounting plate part numbers areP474-0421 (7 x 41/4-in.) or P474-0421L (51/2 x 61/4-in.).a. Install the metal mounting plate to wall or junctionbox with 2 screws provided. Use the outermostscrew holes.b. Place plastic mounting plate over the metal mount-ing plate. Be sure wiring exits through holes inboth mounting plates. Plastic mounting plate issecured to metal mounting plate when the thermo-stat mounting base is installed (Step 7).5. Remove the thermostat cover from back plate to exposemounting holes and wiring connections. See Fig. 1.6. Route thermostat wires through large hole in thermostatmounting base. Remove outer sheath from wires for add-ed flexibility. Standard solid or multi-conductor thermo-stat wire should be used from the thermostat to the unit.Size and length considerations are as follows: for amaximum distance from unit of 36 ft, use 22 AWG(American Wire Gage) wire; for a maximum distancefrom unit of 100 ft, use 18 AWG wire.7. If accessory mounting plate is not used:Level back plate against wall and mark wall through the2 mounting holes in base. Drill two 3/16-in. mountingholes in wall where marked. Mounting holes are providedif installing on unit.Secure back plate to wall or unit with 2 screws andanchors provided. Ensure all wires exit through hole inback plate.If accessory mounting plate is used:Secure the metal mounting plate to the wall with twoscrews provided. Use the outermost screw holes. Placethe thermostat back plate securely in the indentationprovided in the plastic mounting plate. Place plasticmounting plate and thermostat back plate over metalmounting plate. Secure mounting plates and thermostatback plate to the wall with 2 screws provided. Ensure allwires exit through hole in mounting base.8. Adjust wire length and routing to allow proper closure ofthe thermostat. Strip each wire at the end no more than1/4-in. to prevent adjacent wires from shorting together.Match and connect wires to terminals on the thermostat.See Fig. 3-7 and Tables 1 and 2.9. Push excess wiring into wall. Seal hole in wall to preventdrafts.10. Re-attach thermostat cover to back plate.11. Turn on power to unit. The thermostat will receive powerfrom the fan coil unit.NOTE: The thermostat is strictly a low-voltage control.One or two 33ZCRLYBRD relay boards must be in-stalled to isolate any line voltage, fans, or water valvesfrom the fan coil.Be careful not to drill into wiring in wall. Electrical shockcould result.Improper wiring or installation may cause damage to thethermostat. Check to ensure wiring is correct before pro-ceeding with installation of unit. Do not run thermostatwiring in same conduit as high-voltage power, or HVACwiring. Interference from other wiring may cause incorrectreadings or commands from thermostat.WIRINGTERMINALBLOCKHOLE FORWIRINGMOUNTINGHOLEMOUNTINGHOLECY1 G3GR W1 G23 1/8"3 1/8" 1"CK1H2ORS+5 RSFig. 1 — Thermostat Back Plate Mountingand WiringLEVEL LEVEL3 9/16"3 3/4"Fig. 2A — Metal Mounting Plate Dimensions