Carrier 38GJQ Series Installation Instructions Manual

Also see for 38GJQ Series: Owner's manual

43Install all Power, Interconnecting Wiring, andPiping to Indoor Unit.1 Run the interconnecting piping and wiring from the outdoorunit to each indoor unit (in matched pairs) (except sizes 48and 56 refer to the Branch Box installation instructions).2 Pass the interconnecting cable through the hole in wall(outside to inside).3 Lift the indoor unit into position and route the piping anddrain through the hole in wall (inside to outside). Fit theinterconnecting wiring into the back side of the indoor unit.4 Hang the indoor unit on the upper hooks of the wallmounting plate (see Fig. 85).A08283Fig. 85 – Hanging Indoor Unit5 Open the indoor unit’s front cover and remove the fieldwiring terminal block cover (see Fig. 86).Field WiringCoverInterconnectingCableA08279Fig. 86 – Field Wiring Cover6 Pull the interconnecting wire up from back of the indoorunit and position in close to the terminal block on theindoor unit.7 Push the bottom of the indoor unit onto the mounting plateto complete the wall mount.8 Connect the wiring from the outdoor unit per theconnection diagram (see Fig. 82).NOTE: Polarity of power wires must match originalconnection on outdoor unit.9 Replace the field wiring cover and close the front cover ofthe indoor unit.10 Connect the refrigerant piping and the drain line outside ofthe indoor unit. Refer to Piping Connections to OutdoorUnit section and Fig. 77 for proper installation of the flareconnections. Complete the pipe insulation at the flareconnection then fasten the piping and wiring to the wall asrequired. Completely seal the hole in the wall.11 Repeat steps 1 through 10 for each indoor unit.System Vacuum and ChargeUNIT DAMAGE HAZARDFailure to follow this caution may result in equipmentdamage or improper operation.Never use the system compressor as a vacuum pump.CAUTION!Refrigerant tubes and the indoor coil should be evacuated using therecommended deep vacuum method of 500 microns. The alternatetriple evacuation method may be used if the procedure outlinedbelow is followed. Always break a vacuum with dry nitrogen.Using Vacuum Pump1 Completely tighten the flare nuts A, B, C, D, (for all fancoils). Connect the gage charge hose to one circuit or allcircuits (if using a multiple connection manifold) at the lowside service valve charge port(s) (see Fig. 87).2 Connect the charge hose to the vacuum pump.3 Fully open the low side of the manifold gage (see Fig. 88).4 Start the vacuum pump.5 Evacuate using either the deep vacuum or triple evacuationmethod.6 After the evacuation is complete, fully close the low side ofthe manifold gage and stop the vacuum pump operation.7 If the multiple connection manifold is not used, repeat theprocedure (1 through 6) until all indoor units and piping arecompletely vacuumed.8 The factory charge contained in the outdoor unit is suitablefor maximum pipe length. If an additional charge isrequired, it should be added to the system as liquid at thistime.9 Disconnect the charge hose from the charge connection ofthe low side service valve.10 Fully open all the service valves.11 Securely tighten the service valves caps.Outdoor Unit Indoor UnitRefrigerantService ValveLow SideHigh SideABCDA07360Fig. 87 – Service ValveManifold Gage500 micronsLow side valve High side valveCharge hose Charge hoseVacuum pumpLow side valveA07361Fig. 88 – Manifold