Make-Up Air Installation Manual

11/23/2011 1 HI309
GENERAL
This is a completely functional electric heat element package with the built-in WarmFlo, duct sensing,
controller. It is installed in the main distribution duct or external to the heat pump unit/air handler.
This module can be installed upflow, downflow, or horizontal. However, it must always be on the
warm air side of the HP coil.
If you desire the outside temperature sensing WarmFlo Smart Controller with its various application
modules (total electric, dual fuel, HP add-on, load management, etc.) this is the wrong product. Call
the factory for further WarmFlo information.
Purpose
When comfort level requires a slight increase in the heat pump air delivery temperature, this module
“tempers” the warm air by raising the warm air temperature a very small number of degrees to produce
comfort level.
Concept (Heat Pump Application)
1. One piece unit, including the electric element.
2. No outdoor sensor.
3. Modulates its own electric element, based upon remote duct sensor and installer set comfort
level temperature.
4. Totally external to the heat pump air handler product.
5. Existing or standard heat pump room thermostat, air handler, strip heat, compressor, etc.; all
remain without modification or functional change.
6. Anyone can install (non HP trade).
7. Adds the comfort level increase in temperature whenever the compressor is on (roomstat
stage 1) and before roomstat stage 2 activates strip heat.
8. Electric element power usage is controlled by duct sensor and comfort level. Electric
element Power is not wasted or turned on in banks.
9. Does not necessarily add to the building service panel loading because as soon as the normal
strip heat turns on (stat stage 2) and raises the temperature, this unit automatically shuts off.
10. Internal logic or chip begins with reset at each “Y” heat call.
ELECTRICAL REQUIREMENTS
EM-WCØ515* - 3ØA Panel Breaker, 2ØA Nominal Amp
EM-WC1025* - 6ØA Panel Breaker, 4ØA Nominal Amp
* H = 10” long element; L = 16” long element
208 Volt application – the elements within the standard product are rated a 240 volts. If operating at
208, there will be approximately 25% reduced capacity. The internal transformer may or may not
adequately operate the control system from a 208 source. Voltage measurements between “R” and
“C” must be 22VAC or greater when the system is in the complete operational mode.