Carrier 40QQ Series Installation Instructions Manual

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35Fig. 41 - Control Box - Bushings to RemoveFig. 42 - Bushings Replaced from Outside ControlBox9. Connect power tap conductors to unit main controlbox.Single point boxRoute power wires thru conduit opening in the unitand connect to the single point terminal block. Formain control box power, take two legs and run themthru the grommet to the main power terminal block.Installing Electric Heater1. Identify heater cover(s) to remove (See Fig. 46).a. All two- heater installations: Remove both heatercovers. Save covers and screws.b. All single- heater installations: Remove the heatercover at Heater 1 position. Save cover and screws.2. Open the heater package(s) and remove the heatermodule, heater support track (where provided), heatercover (where provided), screws, wiring label,miscellaneous parts.a. Heaters 101A00- 109A00: To install module, insertheater frame into location notch in heater bracketopening in unit and slide heater through the opening.Fasten heater module to heater mounting bracketwith the four screws saved from Step 1 (See Fig. 46).c. All other heaters: To install module, engage flangeon heater with track in unit and slide heater throughmounting bracket opening. Fasten heater module toheater mounting bracket with the four screws savedfrom Step 1 (See Fig. 46).3. Single- phase heater conversion 208/230- v heaters101A00- 104B00 are factory- wired for 3- phaseapplications but can be converted to single- phase bychanging one wire as described below.Three- phase applications: Skip to Step 4. Forsingle- phase applications, rewire the heater asfollows (see Fig. 42):a. Connect RED wire provided with kit to HeaterRelay (HR) and to L1 as shown.b. Disconnect YELLOW wire from HR Terminal 2and reconnect to HR Terminal 3.c. Using the wire tie provided, fasten the RED wireto heater power wire harness near existing wire tie onheater module. This provides strain relief for theRED wire. (See Fig. 47).Connect BLACK and RED conductors in heater powerwire harness to the same L1 pole on single point box TBor fuse block. Connect BLUE and YELLOW conductorsin the heater power wire harness to the same L2 pole onsingle point box TB or fuse block (See Fig. 43).LEGENDHR - Heater RelayHTR - HeaterLS - Limit SwitchControl WiringPower WiringFig. 43 - Single- Phase Heater Wiring40QQ