Carrier 42S Series Installation, Start-up And Service Instructions Manual

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Carrier 42S Series Installation, Start-up And Service Instructions Manual Manual pdf 22 page image

22Fig. 32 — 42SM Unit Knockout LocationsTop View (Typical)Fig. 33 — 42SM Unit Supply Air Knockout TabLocationFig. 34 — 42SM Unit Supply Air Installation10. Use adhesive or glue to re-attach insulation that haspulled away from the unit during knockout removalprocess.11. For ducted applications, tape should be applied alongand around all of the supply air opening knockouts toprevent air leakage.Step 2 — Make Electrical ConnectionsRefer to unit nameplate for required supply voltage, fan andheater amperage, and required circuit ampacity. Refer to unitwiring diagram for unit and field wiring. Since each project isdifferent and each unit on a project may be different, the in-staller must be familiar with the wiring diagram and name-plate on the unit before beginning any wiring. Make sure allelectrical connections are in accordance with unit wiring dia-gram and all applicable codes. The type and sizing of all wir-ing and other electrical components such as circuit breakers,disconnect switches, etc. should be determined by the indi-vidual job requirements, and should not be based on the sizeand/or type of connection provided on the equipment. All in-stallations should be made in compliance with all governingcodes and ordinances. Compliance with all codes is the re-sponsibility of the installing contractor.The fan motor(s) should never be controlled by any wiring ordevice other than the factory-supplied switch or thermostat/switch combination unless prior factory authorization is ob-tained. Fan motor(s) may be temporarily wired for use duringconstruction only with prior factory approval and only instrict accordance with the instructions issued at that time.The unit electrical supply is designed to enter through knock-outs provided in the top of the unit and pass down throughmatching knockouts in the control section top. Where spaceallows, power may be pulled directly through the side of thecabinet into the control section.All components furnished for field installation by either thefactory or the controls contractor should be located andchecked for proper function and compatibility. All internalcomponents should be checked for shipping damage, and anyloose connections should be tightened to minimize problemsduring start-up.Any devices such as fan switches or thermostats that havebeen furnished from the factory for field installation must bewired in strict accordance with the wiring diagram that ap-pears on the unit. Failure to do so could result in personal in-jury or damage to components, and will void all manufactur-er's warranties.The manufacturer assumes no responsibility for any damagesand/or injuries resulting from improper field installation and/or wiring.FACTORY-INSTALLED OPTIONSCondensate Overflow SwitchThe condensate overflow switch is used to detect a cloggedcondensate drain pan. The condensate switch uses a normallyclosed contact to allow the system control power to passthrough the switch energizing the water valves and fans al-lowing normal operation. When an overflow condition is de-tected by the switch, it opens the NC contact and de-energizesthe water valve and fans.AquastatThe aquastat must be able to sense whether the flowing wateris being chilled or heated and switches a contact closed to pro-vide automatic summer or winter changeover for the system.When a two-pipe cooling/heating system with optional auxilia-ry electric heat is desired, an additional aquastat is required.If the valve package is field-supplied, the aquastat must be in-stalled in a location where it will sense the water temperatureregardless of control valve position. A bleed bypass should beprovided for proper operation of aquastat. The bleed line al-lows a small amount of water to flow from supply to returnpiping when the control valve is closed for loop temperaturesensing.All field wiring must be in accordance with governing codesand ordinances. Any modification of unit wiring without fac-tory authorization will invalidate all factory warranties andnullify any agency listings. The manufacturer assumes no re-sponsibility for any damages and/or injuries resulting fromimproper field installation and/or wiring.Units may be equipped with line voltage controls or 24 vaccontrol systems. The following descriptions are for typicalcontrol sequences only. For detailed control operating se-quence, refer to thermostat operating instructions.TOP SUPPLYAIR KNOCKOUTTOP VIEWELECTRICALKNOCKOUTSKNOCKOUT TAB(10 PLACES)DUCT BREAK(4 PLACES)KNOCKOUT TABTRIM LINEUNITWALLUNITINSULATION90ºDUCT FLANGEIMPORTANT: Refer to unit wiring label for specific func-tions. Standard wiring diagram configurations are main-tained in separate Fan Coil Wiring Diagram literature. Re-fer to unit wiring label for specific functions.