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PACKAGE CONTENTS
Electrical Heaters
Table 18 – CRHEATER323A00- CRHEATER338A00
Contents
Heater module
Screws
Wiring label
Red wire (10 gage)
†
Splice connector
†
Wire tie
†
Label, max temp/static
† Supplied with electric heater packages CRHEATER323A00, 327A00,
329A00 - 331A00 only.
Single Point Boxes
Table 19 – CRSINGLE037A00
Item Description
Single point box housing assembly
(Height 18in/449mm)
Terminal block
Conductors, tap, #10
Rain shield with conduit seal
Screws, #10 x 1/2 in
Wire ties
Tube clamp
Seal strip
Table 20 – CRSINGLE038A00
Item Description
Single point box housing assembly
(Height 18 in/449 mm)
Terminal block/Fuse holder
Fuse block
Fuses, 60A class RK5
Power distribution harness
Conductors, tap, #10
Rain shield with conduit seal
Screws, #10 x 1/2 in
Wire ties
Tube clamp
Seal strip
GENERAL
This installation instruction manual
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 5 tons.
Quantity
This information does not include selection data. Refer to
1
project plans, job submittals and selection programs for
4
heater and field power termination/SPB kit usage.
1
Electric Heaters
1
Heaters are shipped with one heater per carton. The carton
1
is marked with a sales package number. On all heaters, the
1
heater model number (as marked on the heater dataplate)
is the same as the sales package number.
1
The heaters are modular in design with heater frames
holding open coil resistance wires strung through ceramic
insulators, limit switches and one or two control
contactors. Power conductors are attached.
Heater modules are installed in the compartment below
the indoor (supply) fan outlet. Access is through the
indoor access panel. Heater modules slide into the
Quantity
compartment through the panel heater opening.
1
Not all available heater modules may be used in every
unit. Only use heater modules that are UL listed for use in
1
a specific size unit. Refer to the label on the unit cabinet
for the list of approved heaters. See Tables 16 and 17 for
3
Electric Heater Module data.
1
Single Point Boxes and Fuses
Single Point Box (SPB) kits provide field power
12
termination location plus an enclosure for heater fuses
7
when required by code. The SPBs are installed under
unit's main control box and include a cover plus all
1
internal wiring. Minimum components of the SPB are a
field power terminal block with tap conductors to connect
1
to the unit's main control box field terminals. Maximum
component population includes up to five fuse blocks.
Fuses for electric heater circuits are required and provided
when the unit's MOCP exceeds 60- A or when the total
Quantity
heater full load amp value exceeds 48- A. When fuses are
required and provided, the cooling circuit is also provided
1
with fuse protection.
No Fuses
1
If unit's MOCP device rating is 60- A or less, the MOCP
1
device is recognized as providing the required overcurrent
protection to the heater, and no internal fusing is required.
6
1
Single Point Box Contents
3
See Package Content tables above for a list of components
1
included in each single point box kit.
Control Wiring
12
Heater modules contain one or two heater control
7
contactors. If a two- circuit heater module is installed, the
cooling unit (AC type) can be connected for one- stage or
1
two- stage heating control.
1
31
describes the
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