32
connection terminal lugs. Refer to unit wiring label to identify
these terminals (these may be lugs on contactors or at power
terminal block). The heater power wires are also connected at
these terminals.
INSTALLATION WITH SINGLE POINT BOX
Remove knockouts for appropriate size conduit from unit
block-off panel and single point box. Install conduit (rigid or
electrometallic tubing) through conduit drip boot as shown. (See
Fig. 17.)
Drip boot will accept conduit sizes 3/4 in. to 1-1/2 in. The drip
boot eliminates the need for watertight conduit fittings at the
single point box.
Unit power supply wires from the external (field-supplied)
disconnect switch are connected to the power lugs on the field
connection device provided in the single point box. This device
may be a terminal block or fuse block FU2’s line side terminals.
The heater power wires are connected to the load side terminals on
the same device.
New Unit With Factory Disconnect
The optional factory-supplied disconnect has a maximum rating
per Table 14.
Check this unit’s infodata plate for the MINIMUM
DISCONNECT SWITCH value (see Fig. 2 and 3) and compare to
the Table 14 value.
NOTES:
1. Standard Efficiency.
2. High Efficiency.
3. Ultra High Efficiency.
4. A is Application Limit based on factory wire size.
IF REQUIRED MINIMUM DISCONNECT VALUE IS
LOWER THAN RATING IN TABLE 14
Reconnect the factory wiring from the factory disconnect at the
single point box’s terminal block or fuse block FU2’s line side
terminals (or to main control box’s line connection lugs if no
single point box is installed). Remove any factory test leads
connected at disconnect line side terminals; discard these wires.
Connect unit power supply wires to disconnect switch line side
lugs.
IF REQUIRED MINIMUM DISCONNECT VALUE IS
HIGHER THAN RATING IN TABLE 14
For units with 60-A, 80-A or 100-A disconnect, remove the
factory disconnect switch assembly and wiring. Install a
field- supplied disconnect switch sized per unit marking.
Complete connections per instructions under “New Unit Without
Factory Disconnect or HACR.”
FOR UNIT WITH 115-A DISCONNECT AND REQUIRED
MINIMUM DISCONNECT VALUE PER UNIT INFO DATA
PLATE IS LESS THAN 200-A
Remove the factory wires at load side terminals of the disconnect
switch. Size new wires based on unit MIN CKT AMPS value for
unit plus heaters plus power exhaust (if installed). Connect new
wires at disconnect switch load side terminals and to single point
box’s terminal block or fuse block FU2’s line side terminals.
Remove any factory test leads connected at disconnect line side
terminals; discard these wires. Connect unit power supply wires to
disconnect switch line side lugs.
FOR UNIT WITH 115-A DISCONNECT AND REQUIRED
MINIMUM DISCONNECT VALUE PER UNIT INFODATA
PLATE IS GREATER THAN 200-A
Remove the factory disconnect switch assembly and wiring.
Install a field-supplied disconnect switch sized per unit marking.
Complete connections per instructions under “New Unit Without
Factory Disconnect or HACR.”
New Unit With Factory HACR
The amp rating of the HACR factory-installed option is based on
the size, voltage, indoor motor and other electrical options of the
unit as shipped from the factory.
When field-installed accessory electric heaters are added to the
unit, the HACR may no longer be of the proper amp rating and
therefore will need to be removed from the unit.
Check this unit’s infodata plate for the FUSE OR HACR
BREAKER value (see Fig. 2 and 3) and compare to the factory
HACR breaker rating value.
IF MARKED HACR VALUE ON UNIT DATAPLATE IS
UNCHANGED FROM RATING UNIT-MOUNTED HACR
Reconnect the factory wiring from the factory HACR at the single
point box’s terminal block or fuse block FU2’s line side terminals
(or to main control box’s line connection lugs if no single point
box is installed). Remove any factory test leads connected at
HACR line side terminals; discard these wires. Connect unit
power supply wires to HACR line side lugs.
IF MARKED HACR VALUE ON UNIT DATAPLATE IS
GREATER THAN RATING ON UNIT-MOUNTED HACR
Remove the factory HACR switch assembly and wiring. Install a
field-supplied fused or HACR disconnect switch sized per unit
marking. Complete connections per instructions under “New Unit
Without Factory Disconnect or HACR.”
Existing Unit
An existing unit will usually have been installed following the
values marked on the base unit’s informative data plate for wire
sizing, branch circuit over-current protection and disconnect
switch rating. When electric heaters are added to air
Table 14 — Optional Factory-Installed Disconnect
Amp Ratings
UNIT GROUP
UNIT SIZES
VOLTS
DISCONNECT
SIZE AMPS
AC-1
1
04-07
208/230
80
460, 575
60
08-14
208/230
80
460, 575
16
208/230
115
4
460, 575
100
AC-2
2
04-06
208/230
80
460, 575
60
07-12
208/230
80
460, 575
14
208/230
115
4
460, 575
100
AC-3
3
04-06
208/230
80
460, 575
07-09
208/230
80
460, 575
12
208/230
115
4
460, 575
100
HP-1
1
04-07
208/230
80
460, 575
60
08-12
208/230
80
460, 575
14
208/230
115
4
460, 575
100
HP-2
2
04-06
208/230
80
460, 575
08-09
208/230
80
460, 575
12
208/230
115
4
460, 575
100
