Carrier 33CS Installation, Start-up, And Operating Instructions Manual

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

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Carrier 33CS Installation, Start-up, And Operating Instructions Manual Manual pdf 2 page image

21. Turn off all power to unit.2. If an existing thermostat is being replaced:a. Remove existing thermostat from the wall.b. 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. Remove the thermostat cover from wall plate (mountingbase) to expose mounting holes. See Fig. 1. With the ther-mostat facing forward, press the back plate on the lefthand side top corner to release the two prongs holding onthe cover. Pull off the cover when the prongs have beendisengaged.4. Route thermostat wires through large hole in mountingbase. Remove outer sheath from wires for added flexibili-ty. Standard solid or multi-conductor thermostat wireshould be used from the thermostat to the unit. Size andlength considerations are as follows: for a maximum dis-tance from unit of 36 ft, use 22 AWG (American WireGage) wire; for a maximum distance from unit of 100 ft,use 18 AWG wire.5. Level mounting base against wall and mark wall throughthe 2 mounting holes in base.6. Drill two 3/16-in. mounting holes in wall where marked.7. Secure mounting base to wall with 2 screws and anchorsprovided. Ensure all wires exit through hole in mountingbase.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. 2-4 and Table 1.9. Push excess wiring into wall. Seal hole in wall to preventdrafts.10. Re-attach thermostat cover to back plate by aligning thetop two prongs of the back plate in the vertical groove ofthe top cover and then snapping the cover onto the backplate.11. Turn on power to unit. The thermostat will receive powerfrom the unit. The thermostat will be powered by 24 v,nominal (18 to 30 vac). Terminals R (+ 24 v), W1/O/B(first stage heat or reversing valve), Y1 (first stage cool-ing), and G (fan relay) will always be connected. Someapplications will use C (common), Y2 (second stagecooling), or W2 (second stage heating).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.Fig. 1 — Thermostat MountingLEGENDW2 — Second-Stage HeatY2 — Second-StageCompressorRS2 — Second RemoteSensor (Not Used)RS+5 — +5 vdcRS1 — Remote SensorRS GND — GroundW1/O/B — First-Stage Heat orReversing ValveY1 — First-Stage CompressorG — FanW3/ECO — EconomizerCK1 — Dry ContactCK2 — Dry Contact GroundR — 24 vac TransformerC — 24 vac TransformerCommon→ Fig. 2 — Thermostat Wiring1204