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6
Table 5 — Single Point Box (High SCCR) (cont)
Table 5 — Single Point Box (High SCCR) (cont)
GENERAL
Puron
®
Units
This installation instruction manual describes the installation of
electric heaters and associated fuse block/field power termination
kits (single point box or SPB) on select small rooftop units in
nominal cooling capacities from 3 to 15 tons. These rooftop units
use Puron refrigerant (R-410A). See Package Usage tables on
page 2 for applicable unit models. Unit types include cooling units
(AC) and heat pumps (HP) distributed over several chassis sizes.
Unit types AC-1, AC-2, HP-1, HP-2 are identified. Unit type
AC-3 consists of a single model: Carrier 50LC.
This information does not include selection data. Refer to project
plans, job submittals and selection programs for heater and field
power termination/SPB kit usage.
Some electric heaters used on these Puron (R-410A) units may
also be installed in earlier R-22 rooftop units. For details on use
with R-22 units, contact your local distributor office.
Single Point Boxes and Fuses
(STD SCCR Units)
The single point box (SPB) kits provide a field power termination
location plus an enclosure for heater fuses when required by code.
The SPBs are installed under the unit’s main control box and
include a cover plus all internal wiring (see Fig. 1). Minimum
components of the non-High SCCR (High Short-Circuit Current
Rating) option SPB are a field power terminal block with tap
conductors (to connect to the unit’s main control box field
terminals). Minimum components of the High SCCR option SPB
are a field power terminal block with tap conductors (to convert to
the unit’s main control box field terminals) and at least one fuse
block with fuses. Maximum component population for both
non-High SCCR and High SCCR options. includes up to five fuse
blocks. See Table 4.
NON-HIGH SCCR FIOP
Fuses for electric heater circuits are required and provided when
the unit’s MOCP exceeds 60-A or when the total heater Full Load
Amp value exceeds 48-A. When fuses are required and provided,
the cooling circuit is also provided with fuse protection; some
units require minor wiring changes in the main control box (see
section on TB10 terminal blocks).
CRSINGLE067A00
QUANTITY
CONTENTS
1
Single Point Box Housing Assembly 33 in (845 mm)
1
Terminal Block
1
Fuse Block
3
Fuse Class J (JKS)
1
Unit Power Wire Harness- 4 GA, 3 wire
1
Rain Shield
7
Screws
6
Wire Ties
1
Seal Strips
CRSINGLE068A00
QUANTITY
CONTENTS
1
Single Point Box Housing Assembly 33 in (845 mm)
1
Terminal Block
2
Fuse Block
6
Fuse Class J (JKS)
1
Unit Power Wire Harness- 4 GA, 3 wire
1
Rain Shield
7
Screws
6
Wire Ties
1
Seal Strips
CRSINGLE069A00
QUANTITY
CONTENTS
1
Single Point Box Housing Assembly 33 in (845 mm)
1
Terminal Block
3
Fuse Block
9
Fuse Class J (JKS)
1
Unit Power Wire Harness- 4 GA, 3 wire
1
Rain Shield
7
Screws
6
Wire Ties
1
Seal Strips
CRSINGLE070A00
QUANTITY
CONTENTS
1
Single Point Box Housing Assembly 33 in (845 mm)
1
Terminal Block
4
Fuse Block
12
Fuse Class J (JKS)
1
Unit Power Wire Harness- 4 GA, 3 wire
1
Rain Shield
7
Screws
6
Wire Ties
1
Seal Strips
CRSINGLE071A00
QUANTITY
CONTENTS
1
Single Point Box Housing Assembly 33 in (845 mm)
1
Terminal Block
2
Fuse Block
6
Fuse Class J (JKS)
1
Unit Power Wire Harness- 2 GA, 3 wire
1
Rain Shield
7
Screws
6
Wire Ties
1
Seal Strips
CRSINGLE072A00
QUANTITY
CONTENTS
1
Single Point Box Housing Assembly 33 in (845 mm)
1
Terminal Block
3
Fuse Block
9
Fuse Class J (JKS)
1
Unit Power Wire Harness- 2 GA, 3 wire
1
Rain Shield
7
Screws
6
Wire Ties
1
Seal Strips
CRSINGLE073A00
QUANTITY
CONTENTS
1
Single Point Box Housing Assembly 33 in (845 mm)
1
Terminal Block
4
Fuse Block
12
Fuse Class J (JKS)
1
Unit Power Wire Harness- 2 GA, 3 wire
1
Rain Shield
7
Screws
6
Wire Ties
1
Seal Strips