10/19/2017
3
EI913
Electrical Hookup
240-volt source
– from the model number and
nameplate determine KW size and amp draw.
According to local codes, building type, wiring
length, etc. use appropriate wiring conductor size
and source circuit breaker. Connect to the terminal
block.
Grounding
– route and install appropriate size
ground conductor between the ground lug and the
building service panel ground bus. This must be a
conductor size according to the total amp rating of
the appropriate unit. Conduit is not an adequate
ground conductor.
Operation
– this unit “turns on” or heats when 24
volts are applied to the yellow and black wires. Via
an external 24-volt transformer or an external
transformer applying 24 volts through an
interlocking contact (airflow switch, danger end
switch, etc., which is necessary to prevent unsafe
operation) arrange your control circuit to apply 24VAC power when you want boost heat.
SUMMER OR COOLING DISABLE
This module must be disabled during the cooling cycle to prevent adding heat to the air conditioning
operation.
Select one of the following 3 installation techniques or methods:
A.
Extend HP reversing valve wire to the designated “RV” tab.
If
the heat pump logic is “logic
high” for heating, cut the W1/W2 resistor on the control board with a side cutter. The location of
this resistor is shown below. Review your heat pump’s installation manual to make certain of
your heat pump’s reversing valve logic.
B.
Add a manual (summer) disable toggle switch between “R” and “RV” tab.
C.
Simply turn off 24ØV breaker during the cooling season.
Method B or C should be used for boost heater applications.
The location of the W1/W2 resistor is circled above.
