INSTALLATION
1. The unit may be installed on a field fabricated mounting frame or support, a factory roof curb mounting frame or
a slab. The following items are important in this regard:
A. Be sure that roof joist or support will not interfere with discharge and return air ducts.
B. Be sure frame or support is square, level and not twisted.
C. Field fabricated frame, support, or slab must be high enough to prevent any form of moisture from enter-
ing unit.
D. All joints on frame must be sealed with caulking compound.
E. Field fabricated curb should be insulated with at least 1 ½” thick rigid type insulation.
F. The roof curb should be counterflashed and sealed before unit is installed.
2. The discharge and return air duct (if required) should be correctly sized for securing to factory installed plenums,
when provided, or to unit. Duct connection(s) exposed to the weather must be watertight. A weathertight seal
must be provided where duct(s) comes through the roof.
WARNING
1.
Field Installed ductwork on the unit discharge end must be secured to the flanges on the heat exchanger and
not on unit front cabinet.
Failure to properly install could cause fire, explosion, damage to equipment or even
death
.
2.
Installer/Service Technician must remove burner tray to inspect burner assemblies, to insure proper alignment.
Disconnect gas supply line to unit gas inlet, remove the “L” locking bracket and disconnect the electrical
connections and slide the burner tray out of the heater. Once inspection is completed, replace the burner tray
assembly and install the “L” locking bracket.
Failure to perform this inspection could result in fire, explosion,
loss of warranty, or even death
.
Installation of this appliance must conform to applicable federal, state, and local codes and regulations, and with
guidelines established by A.G.A. (American Gas Association), NFPA (National Fire Protection Association), N.E.C.
(National Electrical Code), the National Board of Fire Underwriters and CAN/CGA B149. Listed are the codes
appearing in this text, the Associations, and their addresses where they may be obtained.
1. The National Fuel Gas Code
2. All NFPA codes, National Electrical Code
Contact American Gas Association (Administrative)
Contact: National Fire Protection Association, Inc.
1515 Wilson Boulevard
Batterymarch Park
Arlington, Virginia 22209
Quincy, Massachusetts 02269
3. Standard of National Board of Fire Underwriters
4. Canadian Gas Association
Contact: National Board of Fire Underwriters
Contact: Canadian Gas Association
85 John Street
178 Rexdale Boulevard
New York, New York 10036
Etobicoke, Ontario, Canada M9W 1R3
ELECTRICAL
1. Unit must be electrically grounded and all wiring must be done in accordance with applicable local codes and the
National Electrical Code.
2. In order to determine the size of the power supply lines, check the electrical specification plate located on the
unit for ampere requirements.
3. On units not ordered with a disconnect switch, it is recommended that a weatherproof disconnect switch be
mounted on or near the unit.
4. Connect power supply lines from main disconnect switch to unit disconnect switch.
5. Install thermostat (RHF and RHV only) or remote control station if supplied according to wiring diagram.
6. Thermostats and remote control stations must be installed in a suitably protected and secure location to prelude
tampering and damage. Thermostats must not be exposed to physical shocks or jarring either before or after
installation.
- 6 -
