York 19 SEER Installation Manual

Contents

5390862-UIM-A-0318Johnson Controls Unitary Products 11FIELD CONNECTIONS POWER WIRING1. Install the proper size weatherproof disconnect switch outdoors andwithin sight of the unit, per local code.2. Remove the screws at the top and sides of the corner cover. Slidethe control box cover down and remove from unit.3. Run power wiring from the disconnect switch to the unit.4. Route wires from disconnect through power wiring exit providedand into the unit control box as shown in Figure 1 and view theopenings in Figure 11.5. Make the power supply connections to the contactor.FIELD CONNECTIONS CONTROL WIRINGThis system is equipped to be either serial communication capable(COMM) or conventionally wired. First determine which setup you aregoing to apply for the application, then follow the necessary steps.DO NOT CUT THE LOW VOTAGE MOLEX PLUGS OFF UNTIL YOUHAVE DETERMINED WHICH METHOD TO CONNECT TO.• Conventional wiring consists of five wires leaving the controlboard connected to (R, C, Y1, Y2, Y2OUT) where four wires endup in a 12 pin Molex connector and the fifth wire is tied back onthe harness with heat shrink on the end.• Serial Communication consists of four wires leaving the controlconnected to (B-, C, R, A+) where four wires end up in a 4 pinMolex connector.You will only connect to one of the two harnesses. Leave the connectoron the harness not being used to prevent a possible short from the24VAC to ground as some wires in both conventional and serial com-munication have power applied from the other harness source depend-ing on which is connected. Cut the Molex connector off of wiringharness being used and connect the field low voltage wiring, using wireconnectors.Terminals on the board from the following pin locations will have powerapplied:Communicating block (B-, C, R, A+); the R terminal/wire will have24VAC.Conventional block (R, C, Y1, Y2, Y2OUT); the R & Y2OUT terminal/wires will have 24VAC.If any of these connections have an unterminated wire at the end, itneeds to be properly capped to prevent a possible short to ground.Conventional Wiring1. Route the 24-volt control wiring (NEC Class 2) from the outdoor unit,to the indoor unit, and to the thermostat in the steps below.2. If utilizing the Demand Response or the Y2Lock feature, a minimumof five thermostat wires will need to be ran to the outdoor unit fromthe indoor equipment. If the features are not applied, only four wiresare needed.3. Trace the harness out where it ends in a large 12 pin Molex con-nector, inside the low voltage box. Clip the 12 pin Molex connectorand discard.4. If utilizing the Demand Response or the Y2Lock feature, Y2outneeds to be connected to the indoor control to cycle between highand low speed airflow. Pull the wire from under the label, strip theend of it, and connect it to the thermostat wire. If you are not apply-ing the features above, do not strip the end. Figures 16-21 indicateproper wiring implementation.5. Strip the remaining four wires that run to R, C, Y1, Y2 and make thenecessary thermostat connections, noted in the thermostat wiringdiagrams. Refer to Figures 16-21.6. Replace the control box cover, removed in Step 2 of the FIELDCONNECTIONS POWER WIRING procedures.7. All field wiring should be in accordance with national electricalcodes (NEC) and/or local-city codes.8. Mount the thermostat approximately 5 ft. above the floor, where itwill be exposed to normal room air circulation. Do not place it on anoutside wall or where it is exposed to the radiant effects fromexposed glass, appliances, drafts from outside doors, or supply airvents.Serial Communication Wiring1. Route the 24-volt control wiring (NEC Class 2) from the outdoor unit,to the indoor unit, and to the thermostat in the steps below.2. Trace the communicating harness from the (B-, R, C, A+) blockwhere it ends in a 4 pin Molex connector, inside the low voltagebox. Clip the 4 pin Molex connector and discard.3. Strip the four wires and make the necessary thermostat connec-tions noted in the thermostat wiring diagrams. Refer to Figures 14 &15.FIGURE 12: Typical 2-Stage Conventional Field Wiring - AC::*<<5&0&00&&5<<<RXW3/8*(PSW\2::RXW:RXW::*<<5&52207+(50267$7)851$&(25$,5+$1'/(57 (50,1$/%/2&.&217$&725/2:92/7$*(9$&&21752/:,5,1*0,1,080*$:,5(1(&&/$66&+$66,6*5281'/8*287'22581,7&21752/%2$5'$&2035(6625QG 67$*(62/(12,'32:(5:,5,1*&217$&7257(50,1$/6&2,/&21'(16,1*81,732:(5:,5,1*&21752/:,5,1*)$&725<:,5,1*$//287'225:,5,1*0867%(:($7+(53522)86(&233(5&21'8&725621/<