High-Voltage Connections; Connecting Ground Lead; Routing Control Power; Accessory Electric - Carrier 50ZH Series Installation, Start-Up And Service Instructions Manual

C00007
Fig. 7--Area Not to Be DriJJed More Than 3/4-in.
CPVC, or 3/4-in. copper pipe (all field supplied). Do not undersize
tile tube. Pitch the drain tube downward at a slope of at least 1 in.
lk)r every I0 ft of horizontal run. Be sure to check tile drain tube
liar leaks. Prime trap at the beginning of the cooling season
start-up. Allowable glues lot condensate trap connection are:
Standard ABS, CPVC, or PVC cement.
Step 7--1nstMI Electrical Connections
The unit cabinet nmst have an nninterrupted, unbroken
electrical ground to minimize the possibility of personal
injury if an electrical fault should occur. This ground may
consist of an electrical wire connected to the unit ground in
the control compartnlent, or conduit approved lot electrical
ground when installed in accordance with NEC (National
Electrical Code), ANSI (American National Standards
lnstitute)/NFPA (latest edition) (in Canada, Canadian Elec-
trical Code CSA C22.1 ) and local electrical codes. Failure to
adhere to this warning could result in serious injury or death.
Failure to lk_llow these precautions could result in damage to
the unit being installed:
1. Make all electrical connections in accordance with NEC
ANSI/NFPA (latest edition) and local electrical codes
governing such wiring. In Canada, all electrical connec-
tions nmst be in accordance with CSA standard C22.1
Canadian Electrical Code Part 1 and applicable local
codes. Relier to unit wiring diagram.
2. Use only copper conductor lbr connections between
field-supplied electrical disconnect switch and unit. DO
NOT USE ALUMINUM WIRE.
3. Be sure that high-voltage power to unit is within operating
voltage range indicated on unit rating plate.
4. Insulate low-voltage wires fol7 highest voltage contained
within conduit when low-voltage control wires are run in
same conduit as high-voltage wires.
5. Do not damage internal components when drilling through
any panel to mount electrical hardware, conduiL etc. On all
3-phase units, ensure phases are balanced within 2 percent.
Consult local power company %r correction of improper
voltage and/or phase imbalance.
HIGH-VOLTAGE CONNECTIONS
The unit nmst have a separate electrical service with a field-
supplied, waterproof disconnect switch mounted at, or within sight
fl'om tile unit. Reler to the unit rating plate lk)r maximum
fuse/circuit breaker size and minimum circuit amps (ampacity) lot
wire sizing. See Table 3 lot electrical data.
The field-supplied disconnect may be monnted on the unit over the
high-voltage inlet hole. See Fig. 2-4.
|
Operalion of nnit on inlproper lilac voltage constilnles abuse |
and may cause unit danlage lhal could allecl warranly.
J
ROUTING POWER LEADS INTO UNIT
Use only copper wire between disconnect and unit. Tile high-
voltage leads should be in a conduit until they enter the unit;
conduit termination at the unit must be watertight. Run the
high-voltage leads through tile hole on the control box side of the
unit (see Fig. 11 lbr location). When the leads are inside the uniL
run leads to the control box (Fig. 121. On 3-phase units, connect
the leads to the black, yellow, and blue wires (see Fig. 13).
CONNECTING GROUND LEAD TO UNIT GROUND
Relier to Fig. 12 and 13. Connect the ground lead to the chassis
using tile nnit ground lug in tile control box.
ROUTING CONTROL POWER WIRES
Form a drip-loop with the thermostat leads belk_re routing them
into the unit. Route the thertnostat leads through grommeted hole
provided in 1.nait into unit control box (See Fig. 11). Connect
therntostat leads and unit power leads as shown in Fig. 13 & 14.
Route thermostat wires through grommet providing a drip-loop at
the paneh Connect low-voltage leads to the thermostat as shown in
Fig. 14.
The unit translomler supplies 24-v power %r complete system
including accessory electrical heater. Trans%rnler is factory wired
%r 2311-voperation. If supply voltage is 208 v, rewire translimner
primary as described in the Special Procedures %r 2118-v Opera-
]ion section below.
ACCESSORY ELECTRIC HEAT WIRING
Relier to accessory electric heat installation instructions lot inlk_r-
marion on installing accessory electric heat. Accessory electric
heat wiring is shown in Fig. 15 - 17.
SPECIAL PROCEDURES FOR 2118-V OPERATION
Make sure that the power supply to the unit is switched OFF
and install lockout tag belk_re making any wiring changes.
Electrical shock can cause serious injury or death.
1. Remove wire nut from connection of ORG wire to BLK wire.
Disconnect the ORG translormer-primary lead from the BLK
wire. Save wire nut. See unit wiring label.
2. Remove tile wire nut from tile temdnal on tile end of the RED
translbrnlel'-prinlal T lead.
3. Save tile wire nut.
4. Connect the RED lead to the BLK wire l?'om which the ORG
lead was disconnected. Insulate with wire nut fi'onl Step 1.
5. Using the wire nut renloved l?'onl the RED lead, insulate the
loose tertninal on the ORG lead.
6. Wrap the wire nuts with electrical tape so that the metal
temdnals cannot be seen.
Indoor blower-motor speeds may need to be changed %r 2118-v
operation. Reler to Indoor Airflow and Airflow Adjustments
section. (See Table of Contents lor page number.)