Carrier 58DHL - Manual (Page 6)

Fig. 13—Amp Draw Check With Ammeter
correspond to that specified on the unit rating plate. Also,
check to be sure that the service provided by the utility is
sufficient to handle the additional load imposed by this
equipment. Refer to the unit rating plate for equipment elec­
trical requirements.
A CAUTION
Do not connect aluminum wire between disconnect
switch and furnace.
See Fig. 15 for wiring diagram showing the proper field
high- and low-voltage wiring. Make all electrical connections
in accordance with the National Electrical Code and any
local codes or ordinances that might apply.
“A F
Fig. 14—Blower Control Center assise
Use a separate fused branch electrical circuit containing a
properly sized fuse or HACR-type circuit breaker for this
furnace. A disconnecting means must be located within
sight of, and readily accessible to, the furnace. The blower
door switch may be acceptable in some areas as a discon­
necting means.
A WARNING
The cabinet must have an uninterrupted or unbroken
ground according to National Electrical Code, ANSI/
NFPA 70-1987, or local codes to nnniinize personal
injury if an electrical fault should occur. This may con­
sist of electrical wire or conduit approved for electrical
ground when installed in accordance with existing elec­
trical codes. Do not use gas piping as an electrical
ground. A failure to adhere to this warning can result in
an electrical shock, fire, or death.
If hne-voltage wiring to the unit is encased in a nonmetaUic
sheath, connect the incoming ground wire to the groimding
wire inside the furnace J-box. If metaUic conduit is used, it
will serve as the ground.
B. Low-Voltage Wiring
NOTE:
When instaUing a Carrier thermostat P/N TSTOl
and relay system P/N TSROl, follow the instructions pack­
aged with the thermostat and relay for installation
procedures.
Make field low-voltage connections at the low-voltage termi­
nal strip. See Fig. 15.
NOTE:
When the furnace is instaRed in the horizontal posi­
tion with RH discharge air, low-voltage wire connections
can be made easier by removing the two control box mount­
ing screws and letting the control box turn so that the low-
voltage screw terminals are visible. Be sure to reinstall the
control box after the connections are made.
NOTE:
Use AWG No. 18 “color-coded” copper thermostat
wire for lengths up to 100 ft. Above 100 ft, use AWG No. 16
wire.
IMPORTANT:
The thermostat heat anticipation must be
set to match the amp draw of the gas valve and electrical
components in the R-W circuit. Accurate amp draw read­
ings can be obtained at thermostat subbase terminals R &
W. Fig. 13 illustrates an easy method of obtaining the
actual amp draw. The amp reading should be taken after the
blower motor has started.
The room thermostat should be located where it will be in
the natural circulation path of room air. Avoid locations
where the thermostat would be exposed to cold-air infiltra­
tion, drafts from windows, doors, or other openings leading
Fig. 15—Heating and Cooling Application Wiring Diagram A78461