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Table of Contents
Instruction Guide:
Auxiliary Heater Installation
Table of Contents
General . . . . . . . . . . . . . . . . . . . 1
Installation Steps . . . . . . . . . . . . . 1-6
Auxiliary Heat Ratings . . . . . . . . . . . 7
Energy Monitoring Connections for
Units with Aurora Advances Control . . . . 8
General
The EA series electric auxiliary heater mounts internally in vertical top and bottom discharge units to provide supplemental and/
or emergency heating capability. On horizontal and rear discharge vertical units, the EA series electric auxiliary heater control box
mounts internally while the electric resistance coil assembly mounts externally. The auxiliary heater uses a control board which
contains the line voltage element control relays. Signals from the main unit control energize the relays in a time-staged sequence.
The auxiliary heater feeds line voltage power to the blower motor and unit transformer to provide emergency heat capability in the
event of an open compressor circuit breaker (caused by a malfunctioning compressor).
Installation Steps
NOTE: Refer to the unit and auxiliary heat electrical diagrams for connector identification.
1)
Examine the auxiliary heater kit for shipping damage. The
EAL(H)15 and EAL(H)20 are supplied with breakers. The
breakers are wrapped in foam and secured in the packaging.
Remove the foam from the breakers and snap the breakers into
the slots provided on the heater frame or control box to secure.
2)
Disconnect power supply to unit.
3)
Remove blower and compressor section front access panels.
4)
Auxiliary heat low voltage control, snip the tie holding the 6-pin
connector to the cabinet in the blower section.
5)
For variable speed ECM models, unplug the power connections
to the blower motor. Remove the ground screw and wire from
the blower housing. Leave motor power connected for PSC and
5-speed ECM models.
6)
For vertical units (see Figure 1):
a)
Remove bolts holding the blower into the cabinet and remove blower assembly from unit.
b)
Install auxiliary heat element rack into the unit in place of the blower assembly and replace bolts.
c)
Install blower assembly into the auxiliary heat element rack using bolts provided.
7)
For horizontal units (see Figure 2):
a) Remove (12) screws holding duct flanges to the cabinet.
b) Install auxiliary heater element rack on unit in place of duct flanges.
c)
Replace (12) screws.
d)
Knock out the 2 in. knockout and insert the provided bushing.
e)
Run wires through the bushing to the control box.
f)
Seal the gap between the wires and bushing with cork tape.
g)
Install the cover over the exposed electrical elements.
8)
Plug the connector(s) from the element rack, on all EA*H and EAS4 heater kits, into the receptacles (P7 and/or P8) on the
back of the control box. Plugs may be located in either receptacle (see Figure 3). Ensure that connectors are engaged
correctly. When properly connected, the locking tab must be squeezed for disconnection. For horizontal and rear
discharge vertical units, seal hole between elements and air handler compartment.
IG1554EW 07/12
INSTRUCTION GUIDE: AUXILIARY HEATER INSTALLATION
Figure 1
1
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Summary of Contents for Aurora EAS4
- Page 1 Install the cover over the exposed electrical elements. Plug the connector(s) from the element rack, on all EA*H and EAS4 heater kits, into the receptacles (P7 and/or P8) on the back of the control box. Plugs may be located in either receptacle (see Figure 3). Ensure that connectors are engaged correctly.
- Page 2 W1 terminal and the black wire connects to the C terminal. From Blower Power (Brown, Orange, Green) • Proceed to step 14A or 14B. 12A) EA*H and EAS4 Heater Kits with Variable Speed ECM Motor Only: • If unit has the Aurora Advanced Control option go to step 12C. Figure 4 Control Box mounts here with EAS4 as well • Plug the existing blower power 5-pin connector (brown, orange...
- Page 3 • Proceed to step 15. 12D) EAM5, EAM8, EAM10, EAL10, EAL15 with Variable Speed ECM Motor and Aurora Advanced Control Option Only: • Plug the existing power blower power 5-pin connector (brown, orange and green wires) into receptacle from the auxiliary heat control panel with the brown, orange, and green wires. The ground wire from the original blower power is no longer used and should be clipped or tied to prevent interference with other components.
- Page 4 • Proceed to step 15. 14A) EA*H and EAS4 Heater Kits with 5-Speed ECM Motor Only: • For 5-speed ECM motors connect the orange and brown blower power wires to the power strip (PS) located inside the unit’s control box as shown in the unit’s schematic.
- Page 5 5 minutes). NOTE: Some products do not allow auxiliary heat staging. Figure 7 Auxiliary heat control box installation in vertical rear discharge cabinets as well as for EAS4 heater kit. All other auxiliary heater kits used on vertical top discharge cabinets have the auxiliary heat controls mounted on the heater frame and do not require auxiliary heat control box installation.
- Page 6 Main Control Box Installation Steps cont. Top Discharge Rear Discharge Figure 8A EALH15, EALH20 Figure 8B EAS4, EASH4, EAMH5, EAMH8, EAMH10 Figure 8C GND. GND. EAL15, EAL20 NOTE: Controls are mounted on auxiliary heater frame. Figure 8D EAM5, EAM8 EAM10, EAL10 NOTE: Controls are mounted on auxiliary heater frame.
- Page 7 14.4 19.2 49,200 65,500 1500 NOTES: High fan tap setting must be above the minimum CFM for the heater selected. Model numbers indicate horizontal/rear discharge and vertical units. Example: EAS4=vertical unit; EASH4=horizontal/rear discharge unit. Table 9 Heater Amps Min Circuit Amp...
- Page 8 If the blower motor in the unit is a variable speed or 5-speed ECM, an extra step is needed to ensure that the Energy Monitoring feature will work properly. On units that have the Aurora Advanced Control option and a variable speed or 5-speed ECM blower motor, the brown wire that is routed twice through the current transducer will need to be replaced with the blue wire that is connected to the auxiliary heat power block.
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