Rheem H2AC Installation Instructions Manual page 21

FIGURE 12
RECOMMENDED BRANCH CIRCUIT DISCONNECT LOCATION
C
D
the unit's RATED VOLTAGE REQUIREMENT. Install a branch circuit disconnect
near the rooftop, in accordance with the N.E.C., C.E.C. or local codes.
2. It is important that proper electrical power is available at the unit. Voltage should
not vary more than 10% from that stamped on the unit nameplate. On three
phase units, phases must be balanced within 3%.
3. For branch circuit wiring (main power supply to unit disconnect), the minimum wire
size for the length of run can be determined from Table 3 using the circuit ampacity
found on the unit rating plate. Use the smallest wire size allowable from the unit dis-
connect to unit.
4. For through the base wiring entry reference Figure 13. All fittings and conduit are
field supplied for this application. Reference the chart in Figure 13 for proper hole
and conduit size.
TABLE 4
AWG Copper
Wire Size
#12
#10
# 8
# 6
# 4
NOTES:
1. For branch circuit wiring (main power supply to unit disconnect), the minimum
wire size for the length of run can be determined from this table using the circuit
ampacity found on the unit rating plate. From the unit disconnect to unit, the
smallest wire size allowable in Table 4 may be used, as the disconnect must be
in sight of the unit.
2. Wire size based on 75°C rated wire insulation for 1% voltage drop.
3. For more than 3 conductors in a raceway or cable, see the N.E.C. (C.E.C. in
Canada) for derating the ampacity of each conductor.
IMPORTANT: THIS UNIT IS APPROVED FOR USE WITH COPPER CONDUC-
TORS ONLY CONNECTED TO UNIT CONTACTOR.
WARRANTY MAY BE JEOPARDIZED IF ALUMINUM WIRE IS CONNECTED TO
UNIT CONTACTOR.
Special instructions apply for power wiring with aluminum conductors:
Warranty is void if connections are not made per instructions.
Attach a length (6" or more) of recommended size copper wire to the unit contactor
terminals L1, L2 and L3 for three phase.
B
E
A
Recommended
Clearance in. [mm]
80 [2032] A - Front
18 [457] B - Condenser Coil
18 [457]
C - Duct Side
18 [457]* D - Evaporator End
60 [1524]
* Without Economizer 48 [1219] With Economizer
ST-A1207-02
AWG Aluminum Connector Type and Size
Wire Size
#10 T & B Wire Nut
# 8 T & B Wire Nut
# 6 Sherman Split Bolt
# 4 Sherman Split Bolt
# 2 Sherman Split Bolt
L
E - Above
(or equivalent)
PT2
PT3
TSP6
TSP4
TSP2
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