Product
Model
Literature Type
Sequence
Date
File No.
Supercedes
Electric, Steam, Hot Water Coils
Supplementary
Electric Heaters
for Air Handler Installations
Service Literature
Unitary Accessories
Installer's Guide
February 2008
18-HB13D7-2
18-HB13D7-1
Unitary
39D
WARNING:
A. GENERAL
This accessory electric heater is designed to provide power directly to the air handler from the
accessory heaters power supply eliminating the
need for additional circuits. The power and control
wiring use a single polorized plug to connect the
heater and the air handler. Single source power
entry is provided for single phase heaters with two
circuits using accessory BAYSPEK140B. See the
Heater Data table on page 2 for the number of
circuits required.
1. Check the air handler heater label to comfirm
that the selected Heater is approved for use with
this air handler, in the installed configuration.
2. Check the components received for damage.
Report any defects or shortages to the transportation company immediately.
3. Be sure the power supply agrees with the listing
shown on heater nameplate.
B. INSTALLATION
1. Remove the blower access panel from the front
of the air handler.
2. Disconnect the female polarized plug from the
wire bundle at left side of air handler near the
knockouts. Discard the male polarized plug and
power wire leads.
3.
(TWG & TGB models only) Remove the cover
from the heater compartment of the air handler
and discard.
HAZARDOUS VOLTAGE - DISCONNECT POWER BEFORE SERVICING
4. Remove the cover from the heater field wiring
and control compartment box. For heaters up
to 15 Kw, an adapter plate is provided which
is used with air handlers that are 21.5” wide
or wider. When required, attach the adapter
plate to the back of the heater on the side
opposite the knockouts using 2 screws.
5. Remove the appropriate knockouts in the heater
field wiring compartment. See Figure 1 on page 3.
Remove the appropriate knockouts in the air handler for making electrical connections to the heater.
The holes in the air handler must align with the
holes in the heater field wiring compartment.
6. Insert the heater assembly into the heater cavity
of the air handler so that the field wiring holes in
the air handler and the heater will align. Secure
the heater compartment to the air handler with
the four screws removed from the hardware
envelope.
IMPORTANT: Conduit must attach directly to
the heater control box.
NOTE: Air handlers approved to use the 1425 heater
have a plate covering either the upper or lower 1.2”
of the heater cavity. This plate is removed ONLY
when the 1425 heater is used. Otherwise it must be
left in place for a blower barrier seal.
7. Make all wiring connections per applicable field
wiring diagrams in these instructions. All instructions must conform to national, state and
local electrical codes.
8. Connect the female polarized plug (disconnected
in item 2 from the wire bundle next to the
knockouts) to the male polarized plug on the
bottom of the heater control box
9. Refer to the heater minimum airflow chart on the
air handler rating nameplate for the appropriate minimum blower speed tap to be used with
removal of the blower access panel. Remove the
metal cover from the circuit breaker opening in
the air handler access panel and discard, cut out
the fiberglass insulation only in the areas where
the disconnect will extend through the opening.
11. Replace all panels removed during the heater
installation.
the approved heater installed.
10. For heaters with self contained disconnect, an
opening in the blower access panel is provided so
that the disconnect may be operated without
1. HEATER LINE VOLTAGE KNOCKOUT LOCATIONS
FOR 1" OR 1-1/2" CONDUIT. CONDUIT MUST BE
ATTACHED DIRECTLY TO THE HEATER CONTROL
BOX. WIRE AND CONDUIT SIZE MUST COMPLY WITH
N.E.C.
2. HEATER LINE VOLTAGE KNOCKOUT LOCATIONS
FOR 3/4" OR 1-1/4" CONDUIT. CONDUIT MUST BE
ATTACHED DIRECTLY TO THE HEATER CONTROL
BOX. WIRE AND CONDUIT SIZE MUST COMPLY WITH
N.E.C.
3. BLOWER CIRCUIT POWER SUPPLY LEADS & LOW
VOLTAGE HEATER CONTROL LEADS FROM AIR
HANDLER CONTROL BOX ARE CONNECTED TO THE
HEATER VIA A POLARIZED PLUG
LEADS FROM AIR HANDLER
CONTROL BOX (SEE NOTE 3)
BLOWER ACCESS PANEL
18-HB13D7-2
Page 3
INSTALLER'S GUIDE
AIR HANDLERMINIMUM HEATING AIRFLOW CFM - HEATER MATRIX
COOLING / HEATPUMP AIRFLOW
AS = Heater application is affected based on whether the outdoor unit is a heat pump or cooling unit.
PS = Minimum speed tap varies based on air handler installation position.
SEE AIR HANDLER NAMEPLATE OR PRODUCT DATA FOR AS/PS NOTES
000 = pigtails, BRK = contains circuit breakers, PDC = contains pull disconnect
* These unts require BAYHTR*******C series heaters
Since the manufacturer has a policy of continuous product and product data improvement,
it reserves the right to change design and specification without notice.
Technical Literature - Printed in U.S.A.
18-HB13D7-2
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