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Warm Air Supply Sensor (ST)
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Locate the ST sensor directly above the electric elements. Requirement is about 24" above the
elements, approximately centered. If there is not 24" height before take-off ducts, locate in the major
distribution duct approximately 3" into distribution duct and approximately 2" from the top.
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Drill ½" hole for insertion of the ST sensor tube and the appropriate holes for sheet metal screw
mounting.
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Mount ST tube using two mounting holes.
OT & ST Sensor Reconnection
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A plug-in terminal block is provided for wiring convenience.
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Both red wires are terminated in the same single screw (+), and both white wires are terminated in
the single common screw (COM). Each appropriate black wire is terminated in the appropriate OT
and ST screw.
WARNING
IF THE BLACK AND RED SENSOR WIRES ARE CROSSED OR INCORRECTLY INSTALLED AT THE TERMINAL
BLOCK AND POWER IS TURNED ON, BURNOUT DAMAGE CAN RESULT WITHIN THE SENSOR PROBE.
WarmFlo Controller Thermostat Connections
24-Volt Power Source – this controller will receive its operating power from the heat pump main and only 24-
volt transformer. This is the same as the "R and C" terminals between the roomstat and outdoor unit. Simply
tap the 24-volt transformer and route to WarmFlo controller upper right "R" and "C".
Grounding – the installer must determine whether the heat pump 24-volt common has a good ground bond
(not simply air handled cabinet skin). If 24-volt common is not grounded, ground the "C" tab (in addition to
its normal hookup) for proper static ground protection.
Room thermostat first stage, Y – the roomstat yellow wire should go directly to the outdoor unit yellow.
This stays intact, but simply add or "tap" a connection from this yellow wire and route to the WarmFlo "Y"
tab. This is the basic "turn-on" or the connection which causes WarmFlo "to do its thing".
Stage 2, typically W or W1 – WarmFlo does not incorporate a Stage 2 function, there is no termination or
connection for this wire. Nor is Stage 2 an optional pickup point for any other function related outside of the
WarmFlo control requirement. Simply leave this unterminated and unused.
Optional, emergency switch function – this wire can be connected to the WarmFlo controller left "E" tab.
This will override all temperature and WarmFlo controller logic functions. When energizing "E" all stages
come on to their full capacity.
CAUTION
Since WarmFlo is an "add-to" controller and since E terminal is a single wire from the stat simply being
energized, all other functions associated with blower, terminating the compressor, etc. when energizing
all electric elements must take place external to this controller.
Heat anticipator – the connection of the WarmFlo "Y" tab does not affect the roomstat heat anticipator
setting. The heat anticipator setting should remain as specified by the manufacturer's instructions.
Utility load control – no direct provisions are made within this product for dual heat or normal utility load
management. In the normal WarmFlo dual heat arrangement load control happens within the furnace interface
module (fossil fuel kit). However, if there is a requirement to control this strip heat product (electric elements)
only, this can be accomplished with a simple connection. Also there is no provision in this product for
compressor load control.
Built-in compressor ODT – if using the built-in ODT function, there must be an added relay to open the
yellow wire going to the outside unit, dotted insert diagram on HH310. This must be a small, low current, 24-
volt DC relay as shown or order EE-5053 part from Electro Industries.
06/07/2016
(reference hookup drawing HH310)
5
EI508
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