INSTALLATION
INSTRUCTIONS
HED
75,000 to 300,000 Btuh Series
DUCT HEATERS
IM-HED-0652455-08
October 2017
Supersedes IM-HED-0652455-07
Table of Contents
HED Unit Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Shipping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
CSA Requirements in USA . . . . . . . . . . . . . . . . . . . . . . . . 4
CSA Requirements in Canada . . . . . . . . . . . . . . . . . . . . . 4
Additional Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 4
Unit Heater Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Combustion and Ventilation Air . . . . . . . . . . . . . . . . . . 5
Rotation of Combustion Air Inducer . . . . . . . . . . . . . . . . . 6
Venting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Typical HED Wiring Diagram . . . . . . . . . . . . . . . . . . . . . . 10
Gas Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Leak Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Unit Start−Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
To Turn Off Gas to Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Heating Sequence of Operation . . . . . . . . . . . . . . . . . . . . . . . 13
Ignition Control LED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
High Altitude Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Gas Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Gas Pressure Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Limit Control Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Combustion Air Pressure Switch . . . . . . . . . . . . . . . . . . . . . . 14
Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Start−Up and Performance Checklist . . . . . . . . . . . . . . . . . . 16
Template . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNING
FIRE OR EXPLOSION HAZARD.
Failure to follow safety warnings exact-ly
could result in serious injury, death, or
property damage.
Be sure to read and understand the
installation,
operation
and
service
instructions in this manual.
Improper installation, adjustment, alter-
ation, service or maintenance can cause
serious injury, death or property damage.
Do not store or use gasoline or other
flammable vapors and liquids in the vicinity
of this or any other appliance.
Installation and service must be per-formed
by a qualified installer, service agency or
the gas supplier.
WHAT TO DO IF YOU SMELL GAS:
•
Do not try to light any appliance.
•
Do not touch any electrical switch; do not use
any phone in your building.
•
Leave the building immediately.
•
Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s
instructions.
•
If you cannot reach your gas supplier, call the fire
department.
