Trane BAYEVCC25BK1 Assembly instructions

25 kW Supplementary
Electric Heater
for Air Handler Installations
INSTALLER'S
GUIDE
IMPORTANT—This Document is customer property and is to remain with this unit. Please return to service information
pack upon completion of work.
ALL phases of this installation must comply with NATION-
AL, STATE AND LOCAL CODES
18-GJ28D1-1C-EN
Models:
BAYEVCC25BK1B
Table of Contents
Section 1. Safety Information ....................................................................................................................................... 1
Section 2. General Information..................................................................................................................................... 2
Section 3. Heater Assembly Labeled ........................................................................................................................... 2
Section 4. Adjust Heater ............................................................................................................................................... 3
Section 5. Install Heater ................................................................................................................................................ 5
Section 6.Tables .......................................................................................................................................................... 11
Section 7. Heater Operation ....................................................................................................................................... 12
Section 1. Safety Information
s
s
WARNING
SAFETY HAZARD! This information is intended
for use by individuals possessing adequate back-
grounds of electrical and mechanical experience. Any
attempt to repair a central air conditioning product
may result in personal injury and/or property damage.
The manufacturer or seller cannot be responsible for
the interpretation of this information, nor can it as-
sume any liability in connection with its use.
LIVE ELECTRICAL COMPONENTS! During
installation, testing, servicing, and troubleshooting
of this product, it may be necessary to work with live
electrical components. Failure to follow all electri-
cal safety precautions when exposed to live electrical
components could result in death or serious injury.
s
s
WARNING
SAFETY HAZARD! Sharp Edge Hazard. Be care-
ful of sharp edges on equipment or any cuts made
on sheet metal while installing or servicing. Personal
injury may result.
CAUTION
HAZARDOUS VOLTAGE! Disconnect all electric
power, including remote disconnects before servicing.
Follow proper lockout/tagout procedures to ensure
the power can not be inadvertently energized. Failure
to disconnect power before servicing could result in
death or serious injury.
ssWARNING

Page 2
INSTALLER'S GUIDE
This electric heater accessory is designed to provide
power directly to the air handler from the accessory
heater's power supply, eliminating the need for addi-
tional circuits. The power and control wiring each use
a single wire harness to connect the heater and the air
handler.
1. Check the heater nameplate to confirm that the selected
heater is approved for use with the air handler.
2. Check the components received for damage. Report any
defects or shortages to the transportation company im-
mediately.
3. Be sure the power supply matches the listing shown on
the heater nameplate.
Section 2. General Information
Section 3. Heater Assembly Labeled
Heater Baffle
Retainer Tab and screw
- in document pack
Heater Rack
Breaker Bracket
Circuit Breakers
Electric Heat
Control Platform
Nameplate
Edge Guard
- in document pack
Base Plate
Cyclic Thermal
Limit Switch
Heater Element
Terminations
Width Adjustment Brackets
Breaker Bracket Cover
Retainer Tab and screw
- in document pack
Electric Heat Control - 13.8V
Non-cyclic
Thermal Limit Switch
Non-cyclic
Thermal Limit Switch

Page 3
INSTALLER'S GUIDE
Section 4. Adjust Heater
STEP 1 - Remove control box
The heater and control box are connected when they
are shipped. Before installation is started, the con-
trol box must be disconnected from the heater.
1. Disconnect the three 4-pin plugs between the
breakers and the heater.
2. Disconnect the ground on the 3-pin plug that is at
the right front of the heater and connected with a
ring terminal to the heater base plate.
3. Disconnect the two ground wires from the lug on
the heater base plate.
Note: It is recommended that the ducting be
attached and sealed before installing the heater. Ring terminal
ground
4-pin plugs
STEP 2 - Adjustment brackets
Two Width Adjustment Brackets are located at the
back of the heater assembly. The heater comes fac-
tory sized for the C cabinet. No modifications to the
Width Adjustment Brackets are required.
Width Adjustment Brackets
(two per unit)
Ground
Lug
20.5

Page 4
INSTALLER'S GUIDE
STEP 4 - (Optional) Rotate Circuit Breakers.
The need to reorient the Circuit Breaker Assembly
depends upon the orientation of your application
and which of the high voltage electrical conduit entry
points you use for high voltage wiring.
SAFETY HAZARD! Sharp Edge Hazard. Be care-
ful of sharp edges on equipment or any cuts made
on sheet metal while installing or servicing. Personal
injury may result.
CAUTION
1. Pull out the tab on the back side of the breaker using
a long screwdriver.
2. Remove the circuit breaker from the control box and
rotate the circuit breakers 180 °.
Important: For air handler units installed in the
horizontal right position, the circuit breakers on
the heater must be rotated in order to comply with
National Electric Code (NEC Section 240.81). The
NEC requires that circuit breakers operated verti-
cally must be oriented so that the "on" position of the
breaker is upward.
Field
Connections
ON
Circuit
Breaker Control
Box
Breaker
Tab
Front
Pull
Pull
Back
Factory
Connections
Circuit Breaker Assembly
STEP 3 - Attach Retainer Tabs.
1. Add the Retainer tabs using the screws provided (both
tabs and screws are located in the documentation
packet).
Leave the screws slightly loose so that the tab can slide
to the left or right as needed. The tab will be used later
to engage in a slot within the air handler cabinet.
Note: The retainer tabs must be attached to the
heater base plate. Leave the screws slightly loose
so they can be slid to the left or right as needed.
2. The edge guard is located in the document pack. Install
the edge guard on the front of the heater flange as
shown.
Rounded
end inserts
into cabinet

Page 5
INSTALLER'S GUIDE
STEP 2 - Disconnect & Dispose of Pigtail Harness.
1. Remove the screw mounted wire tie that is holding the
pigtail harness and case ground wire to the cabinet.
Remove the wire tie from the two green ground wires.
2. Unplug and dispose of pigtail harness.
Section 5. Install Heater
STEP 1 - Remove Heater Compartment Panel.
Heater
Compartment
Panel
3. Place the circuit breakers back into the control box.
The tabs on the breakers are spring loaded and will
snap back to their locked position once the breakers
are properly seated.
Field
Connections
ON
Circuit
Breaker Control
Box
Factory
Connections
Circuit Breaker Assembly - Rotated
Pigtail
Harness
Wire Tie

Page 6
INSTALLER'S GUIDE
Important: If using a BAYSUPFLGA, B, or C Supply
Duct Flange Kit, install the kit before inserting the
heater.
STEP 3 - Insert heater assembly into heater compart-
ment.
1. Move factory wiring out of the way and into the grooves
provided in cabinet.
2. Slide heater into heater compartment of air handler.
STEP - 4Lock Retainer tabs.
Note: Retainer tabs are used to secure the heater
inside of the heater compartment.
1. Slide retainer tab into recess in air handler cabinet.
2. Tighten screws to hold tab securely.
3. Repeat actions to secure the other tab.
STEP 5 - Select a conduit entry point. See the
orientations on the following pages for entry point
selections.
1. Select the entry point on the control box cover you will
use to bring in your high voltage wiring.
2. Remove knockout from the entry point.
3. Remove the plug from the 1-1/2" hole in the cabinet.
4. After the ductwork is installed, secure the control box to
the top panel of the air handler.
Note: Use the low torque setting when attaching
the screws to the unit.
Retainer
Tab
Conduit Entry Points (4 total)

Page 7
INSTALLER'S GUIDE
Upflow - Route conduit, as shown.
Downflow - Route conduit, as shown.
Note: A minimum of 8" is required for installation and
servicing of the control box.
8" Min.

Page 8
INSTALLER'S GUIDE
Horizontal Left - Route conduit, as shown.
Horizontal Right - Route conduit, as shown.

Page 9
INSTALLER'S GUIDE
RED
FACTORY FIELD
BLK
BLK
BLK
GND
GND (2)
RED
RED
STEP 6 - Route conduit, if used, and wiring to the
entry point and connect.
1. Connect field supplied conduit to breaker box.
STEP 7 - Connect high voltage wiring
1. Connect high voltage field wiring.
2. Route the three 4-pin connectors, one 3-pin connector,
and two ground wires through the hole in the top panel.
3. Reconnect the ground wire coming from the 3-pin con-
nector to the heater base plate front using the screw
removed earlier. (See Section 4, Step 1 for illustration)
4. Reconnect the 3-pin plug on the heater to the 3-pin plug
in the air handler case.
5. Reconnect the two ground wires to the lug on the base
plate. See illustration in Step 8.
Note: Minimum terminal screw torque is 45 in-lbs.
STEP 8 - Plug Connections
1. Connect the three 4-pin connectors from the circuit
breakers to the three 4-pin connectors coming from the
heater. The connectors are labeled "Circuit1", "Circuit
2", and "Circuit 3". Line up the mating male and female
connectors and connect.
Note: One set of plugs has only two wires each.
2. Connect the field ground wire to the lug on the heater
base plate.
Field
ground
Lug

Page 10
INSTALLER'S GUIDE
STEP 9 - Connect low voltage wiring.
1. Attach the low voltage harness to Electric Heat Control
connector on the board as shown.
Low Voltage
Harness
STEP 10 - Place Wiring Diagram.
1. Attach the wiring diagram, included in the documenta-
tion packet, to the back of the heater compartment
panel.
Close up with some wires not shown

Page 11
INSTALLER'S GUIDE
STEP 11 - Replace Heater compartment panel on air
handler.
Section 6. Tables
Important: The BAYEV* electric heat accessory may include up to a combination of three 60 amp circuit breakers to
provide an electrical disconnect for service personnel that is intended to help protect internal electrical components in
the event of a short circuit or ground fault. As designed, the circuit breakers supplied in the BAYEV* accessory DO NOT
provide overcurrent protection of the branch circuit. Therefore, the branch circuit(s) shall be sized and protected according
to the unit nameplate.
Table 6.1 BAYEV -- HEATER DATA
Heater Model No. Number of
Circuits
240 VOLT 208 VOLT
Capacity Heater Amps
per Circuit
Capacity Heater Amps
per Circuit
kW BTUH kW BTUH
BAYEVCC25BK1 3 24.00 82000 40/40/20 18.00 61500 34.6/34.6/17.3
Table 6.2 MINIMUM HEATER AIRFLOW CFM - HEATER MATRIX
MODEL NO. BAYECC25BK1
W/O HP / WITH HP
TAM7A0C48H41S 1625 -- 1813
TAM7B0C60H51S 1625 ①-- 1813
--
TAMGA0C48H41S 1625 -- 1813
TAMGA0C60H51S 1625 ①-- 1813
TAM8A0C48V41C 1625 -- 1813
TAM8B0C60V51C 1625 ①-- 1813
SEE AIR HANDLER NAMEPLATE OR PRODUCT DATA FOR EXCEPTIONS
①Not approved for 208V when installed in horizontal left position without Heat Pump.

About Trane and American Standard Heating and Air Conditioning
Trane and American Standard create comfortable, energy efficient indoor environments for residential applications.
For more information, please visit www.trane.com or www.americanstandardair.com
The manufacturer has a policy of continuous data improvement and it reserves the right to change design and specifications without notice. We are
committed to using environmentally conscious print practices.
© 2020
18-GJ28D1-1C-EN 29 Apr 2020
Supersedes 18-GJ28D1-1B (December 2014)
Section 7. Heater Operation
7.1 TAM7/TAMG Heater Operation
Electric Heat
1. R-W contacts close on the comfort control sending 24VAC to
W1 of the AFC.
2. R-G contacts close on the comfort control sending 24VAC to G
of the AFC.
3. The AFC communicates to the EHC that 1st stage electric heat
is being called upon.
4. The EHC determines the number of elements that are used for
1st stage and sends a message to the AFC for that correct cfm.
(The EHC determines the amount of heat per stage by either
factory programming or by the kw jumper position)
5. The AFC micro-processor sends a command to the serial com-
municating blower motor to run and close the blower interlock
relay on the EHC. The blower motor will now run at the W1
electric heat cfm.
6. On subsequent calls for W2 and/or W3, the EHC will communi-
cate to the AFC the required airflow request and energize the
additional relays.
NOTE: The EHC has “lead-lag” logic built in that energizes the elec-
tric heat relays based upon cycle counts.
For example: BAYEV**15 – The first time W1 only is energized; the
K1 relay would close and energize the “A” heater. The second
time W1 only is energized; the K2 relay would close and ener-
gize the “B” heater. The third time W1 only is energized; the K3
relay would close and energize the “C” heater.
Electric Heat
1. When a request for electric heat is received, the AFC com-
municates to the EHC how much demand for auxiliary heat
is being requested
2. The EHC determines the number of elements that will be
used for this request and sends a message to the AFC for
proper airflow. (The EHC determines the amount of heat
available per stage by either factory programming or by the
kW jumper position)
3. The AFC sends a command to the serial communicating
blower motor to run proper airflow and close the blower
interlock relay on the EHC.
4. As demand from the thermostat increases, the EHC will com-
municate to the AFC the required airflow when energizing
additional relays.
NOTE: The EHC has “lead-lag or rotating” logic built in that en-
ergizes the electric heat relays based upon cycle counts. To
verify operation of all heating elements, switch thermostat
to Emergency Heat and raise the setpoint of the thermostat
at least 5 degrees above the actual room temperature.
7.2 TAM8 Heater Operation
Control Board Jumper Settings
When the heater comes from the factory, all dip switches will be
in the ON (park) position. The control is already configured for the
heater size that is required, so no adjustments are necessary.
NOTE: If the dip switches are changed to another kw rating,
the original "Park" programming is not lost;, however the dip
switches must be placed in the ON (park) position or the cor-
rect kw of the heater model for normal operation.
Heater Wattage Selection Table
Heater Wattage S1 SW1 S1 SW2 S1 SW3 S1 SW4 S1 SW5
PARK ON ON ON ON ON
4 KW ON ON ON OFF OFF
5 KW OFF ON ON ON ON
8 KW ON OFF ON ON ON
10 KW ON ON OFF ON ON
15 KW ON ON ON OFF ON
20 KW ON ON ON ON OFF
25 KW OFF ON ON ON OFF