Make-Up Air Installation Manual

11/23/2011 2 HI309
INSTALLATION REQUIREMENTS
1. All installation work must be performed by trained, qualified contractors or technicians.
Electro Industries, Inc., sponsors installation and service schools to assist the installer.
2. All electrical wiring must be in accordance with national electric codes and local electric
codes, ordinances, and regulations.
3. Observe electric polarity and wiring colors. Failure to observe could cause electric shock
and/or damage to the equipment.
4. This unit can only be used for its intended design as described in this manual. Any internal
wiring changes, modifications to the circuit board, modifications or bypass of any controls, or
installation practices not according to the details of this manual will void the product
warranty, the ARL certification label, and manufacturer product liability. Electro Industries,
Inc., cannot be held responsible for field modifications, incorrect installation, and conditions
which may bypass or compromise the built-in safety features and controls.
HEAT PUMP INSTALLATION – AIR FLOW REQUIREMENTS
Since this is a heat pump application and since this is typically a “temperature boost” electric heating
unit, it is assumed the heat pump air handler capacity is larger than the basic requirement of this
product. But as a verification, the minimum airflow required by this product is:
EM-WCØ515* 1000 CFM
EM-WC1025* 1500 CFM
This unit is installed in the warm air, discharge, plenum of the heat pump air handler or in the plenum
above the A-coil (typically two units, one on each side). In all cases it must be external to the heat
pump cabinet. The location within the plenum is determined by the following requirements:
1. Before any horizontal distribution duct, elbows, tee, etc.
2. Maximum practical distance from the HP air handler, but meeting the requirements of paragraph
1 above.
3. If the plenum is a straight discharge (no elbow, obstruction, tee, etc.) from the HP air handler,
National Electric Code paragraph 424-59, four ft. rule, does not apply.
4. If the plenum is larger than 12” x 12” and there is a need to install this unit closer than 18 inches
to the HP air handler discharge blower, call the factory for special baffling instructions.
5. HP air handler discharge blower – attempt to center the electric elements in the plenum and with
the maximum practical distance from the blower discharge.
6. Above A-coil – typically one on each side, angled such that the discharge air from each A-coil
“slab” goes through the element rack. Typically the heat pump airflow is significantly greater
than required by these boost inserts (electric insert is typically small in capacity); therefore,
baffling is not required, simply locate so the majority of the A-coil discharge air goes through
the element rack.
CLEARANCE – DUCT SURFACE AREAS, DUCT
INSTALLATION, ETC.
When installed within air handler plenum or furnace/A-coil plenum, the codes and rules relating to
clearance apply.
When installed in an “inline” duct or round pipe adapter for a general distribution boost heater or air
make-up application, observe the following guidelines:
1. This product must be installed in a metal duct, size of the element rack.
2. There shall be no insulation on the inside of this sheet metal duct section.
3. Any flex-pipe or other insulated pipe must be at least 24” from the electric element.
4. Mounting – there must be at least 2” air clearance around all sides of this sheet metal duct section.