Operating instructions

5
WARNING
T
O PREVENT PROPERTY DAMAGE, PERSONAL INJURY OR DEATH, DUE TO FIRE,
EXPLOSIONS, SMOKE, SOOT, CONDENSATION, ELECTRIC SHOCK OR CARBON
MONOXIDE, THIS UNIT MUST BE PROPERLY INSTALLED, REPAIRED, OPERATED,
AND MAINTAINED.
SHIPPING AND HANDLING
Units are securely packed in shipping containers approved by
the International Safe Transit Association. Check the carton
upon arrival for external damage. If damage is found, file a
request in writing for inspection by the carrier agent immediately.
The carrier is responsible for making prompt inspection of
damage and for a thorough investigation of each claim. The
distributor or manufacturer will not accept claims from dealers
for transportation damage. If no damage is found, carefully
remove all shipping material and properly dispose of it.
Keep the unit as upright as possible. Laying the unit on its side
or top could cause equipment damage.
RIGGING AND HANDLING
WARNING
T
O PREVENT PROPERTY DAMAGE, THE UNIT SHOULD REMAIN IN AN UPRIGHT
POSITION DURING ALL RIGGING AND MOVING OPERATIONS.
T
O FACILITATE
LIFTING AND MOVING WHEN A CRANE IS USED, PLACE THE UNIT IN AN
ADEQUATE CABLE SLING.
NOTE: Refer to Product Data Book applicable to your model* or the
unit Rating Plate for approved duct orientation, before using down
discharge openings.
Important: If using bottom discharge with roof curb, ductwork
should be attached to the curb prior to installing the unit.
Ductwork dimensions are shown in roof curb installation
instructions.
Refer to the Roof Curb Installation Instructions for proper curb
installation. Curbing must be installed in compliance with the
National Roofing Contractors Association Manual.
Lower unit carefully onto roof mounting curb. While rigging unit,
center of gravity will cause condenser end to be lower than
supply air end.
If using a fork lift, see the following figure for location of fork
prongs. Make certain prongs support unit weight.
Fork Lift From
Back Of Unit
Fork Lift Unit Positioning
PROPER PIPING PRACTICE
The gas line installation must comply with local codes, or in the
absence of local codes, with the latest edition of the National
Fuel Gas Code NFPA 54/ANSI Z223.1.
IMPORTANT NOTE: This unit is factory set to operate on
natural gas at the altitudes shown on the rating plate. The
plate is stamped with the model number, type of gas and gas
input rating. Make sure the unit is equipped to operate on the
type of gas available.
DO NOT VARY FROM THE MINIMUM SUPPLY PRESSURE
GIVEN IN THE INLET GAS PRESSURE TABLE.
Doing so could create ignition problems.
Inlet Gas Pressure
Natural Min. 5.0" W.C., Max. 10.0" W.C.
Propane Min. 11.0" W.C., Max. 13.0" W.C.
Inlet Gas Pressure Must Not Exceed the Maximum Value Shown in
Table Above.
DO NOT EXCEED THE RATED INPUT SHOWN ON THE
RATING PLATE.
Overfiring of the unit could result in premature heat
exchanger failure.
DO NOT UNDERSIZE THE NATURAL/PROPANE GAS
PIPING FROM THE METER/TANK TO THE UNIT.
Doing so could cause unsatisfactory operation or equipment
damage due to under firing of equipment.
When sizing a trunk line, include all appliances on that line
that could be operated simultaneously.
Len
g
th of
Pipe in Feet
1/2 3/4
1
1 1/4 1 1/2
10 132 278 520 1050 1600
20 92 190 350 730 1100
30 73 152 285 590 980
40 63 130 245 500 760
50 56 115 215 440 670
60 50 105 195 400 610
70 46 96 180 370 560
80 43 90 170 350 530
90 40 84 160 320 490
100 38 79 150 305 460
Pressure = .50 PSIG or less and Pressure Drop of 0.3" W.C. (Based
on 0.60 S
p
ecific Gravit
y
Gas
)
Natural Gas Capacity of Pipe
in Cubic Feet of Gas Per Hour
(
CFH
)
Nominal Black Pipe Size (inches)
BTUH Furnace Input
Heatin
g
Value of Gas
(
BTU/Cubic Foot
)
CFH =
WARNING
T
O AVOID PROPERTY DAMAGE, PERSONAL INJURY OR DEATH WHEN EITHER
USING PROPANE GAS ALONE OR AT HIGHER ALTITUDES, OBTAIN AND INSTALL
THE PROPER CONVERSION KIT(S).
F
AILURE TO DO SO CAN RESULT IN
UNSATISFACTORY OPERATION AND/OR EQUIPMENT DAMAGE.
H
IGH ALTITUDE
KITS ARE FOR
U
.
S
. INSTALLATIONS ONLY AND ARE NOT APPROVED FOR USE
IN
C
ANADA.
HIGH ALTITUDE DERATE (U.S. INSTALLATIONS ONLY)
IMPORTANT NOTE: The gas/electric units naturally derate with
altitude. Do not attempt to increase the firing rate by changing
orifices or increasing the manifold pressure. This can cause
poor combustion and equipment failure.