21
Fig. 27 — Typical 3-Phase Wiring Installed
LARGE CABINET INSTALLATION
Product Groups/Sizes included in this section:
• AC-1 16 (180)
• AC-2 14 (150)
• AC-3 08-12
• HP-1 14 (150)
• HP-2 12 (120)
Check Sales Packages
Following the project drawing schedule tables or submittal
documents, select the scheduled heaters and single point boxes (if
used) and place at each unit.
Compare the sales package number(s) for scheduled heater
modules against the approved usage table on the unit’s info plate.
See Fig. 2-5 for typical plate data. If the scheduled heater usage
does not appear on the unit infoplate label, STOP. Contact the
project engineer or the local distributor sales office for
clarification.
Open the cartons and inspect for damage.
Disconnect Field Power Supply
1. Disconnect power to the unit. Lock-out/tag-out on unit
disconnect switch.
2. Open and remove the access panel and cover to the main
control box.
3. Use a voltmeter to check that no power is present at unit
terminal block.
Install Single Point Box
(CRSINGLE047A00, 049A00, 050A00-054A00
[STD SCCR], CRSINGLE064-073A00 [High
SCCR])
1. Remove kits from boxes and verify that all of the correct parts
have arrived undamaged.
2. If power is already connected to unit, disconnect all power to
the unit per correct lock-out/tag-out procedures. Disconnect
field power wiring or optional factory-installed disconnect or
HACR power leads at TB1 and withdraw the wiring from the
unit control box.
3. Remove outdoor access, control box, and left indoor access
panels from the unit and save screws. (See Fig. 28.) Figure 29
shows the unit with the panels already removed.
4. Optional – The center post may be removed to facilitate
wiring.
5. Remove the bushings and plug from the control panel per
Fig. 30. Save the bushings and discard the plug.
6. Add seal strip to the rear bottom corner of the control panel as
shown in Fig. 31.
7. Foil tape open screw holes on the back of the single point box
as shown in Fig. 31. Different single point boxes will have
different screw holes open.
8. Remove the cover from the single point box.
9. Install the single point box under the control panel with two
screws down through the control panel (see Fig. 30) and one
screw (not shown) into the center post. (See Fig. 30.) Holes
have been provided. Foam wire guides in the center post may
have to be removed. If center post was removed per Step 4,
the single point box will have to be screwed into it later.
10. The single point box kit will contain two rain shield brackets,
a larger bracket with boot seal and a smaller (shorter) bracket
without a seal. Remove the seal from the larger bracket and
push the conduit drip boot seal into the short rain shield
bracket. (See Fig. 32.) Discard the larger bracket.
11. Install the rain shield bracket to the left and behind the single
point box using the two screws and holes provided.
12. Re-install the bushings removed in Step 5.
13. Connect the tap conductors.
a. CRSINGLE047A00, 050A00 and 052A00
(STD SCCR option):
Connect the blue, yellow, and black power tap
conductors (pigtails) from the single point box to the
unit’s power terminal block TB-1 per unit label wiring
schematic and per Appendix A,B or C and connection
figures. A representative installation of two 480v heaters
and corresponding single point box is shown in
Fig. 33-35.
b. CRSINGLE051A00, 053A00 and 054A00
(STD SCCR option):
These kits include two sets of tap conductors (blue,
yellow and black pigtails) connected at fuse blocks 1 and
2. Connect these leads in parallel to the unit’s power
terminal block TB-1 per the unit label wiring schematic
and per Appendix A-D and connection figures. (These
kits also include two small terminal blocks (TB10). The
TB10 blocks are not used with large cabinet units in this
section; discard.)
c. CRSINGLE064A00-073A00 (High SCCR option):
Connect the blue, yellow and black power tap
conductors (pigtails) from the single point box into the
High SCCR fuse box mounted to the underside of the
unit main control box. Connect the power tap conductors