Unitary products group G8C Installation Instructions Manual
INSTALLATION
80% OUTDOOR
AUTOMATIC
INSTRUCTIONS
GENERAL INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
BLOWER PERFORMANCE FOR SMALL CHASSIS
OUTDOOR FURNACES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
BLOWER PERFORMANCE FOR LARGE CHASSIS
OUTDOOR FURNACES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PRE-INSTALLATION INSPECTION . . . . . . . . . . . . . . . . . . . . . . . 3
CODE COMPLIANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
FURNACE LOCATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
CLEARANCE TO COMBUSTIBLE MATERIALS . . . . . . . . . . . 4
OUTSIDE SLAB INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . 4
COMBUSTION AND VENTILATION AIR . . . . . . . . . . . . . . . . . . . 4
INSTALLATION OF EXHAUST AND INTAKE-AIR HOOD
ASSEMBLIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
FURNACE SIZING AND DUCT SYSTEM DESIGN . . . . . . . . . . . 5
A/C USAGE DUCT SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . 6
RETURN AIR, FILTERS, AND DUCT CONNECTIONS . . . . . . . . 6
RETURN AIR TEMPERATURE . . . . . . . . . . . . . . . . . . . . . . . . 6
FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
DUCT CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
GAS PIPING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
ELECTRICAL WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SERVICE WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
ELECTRICAL GROUNDING . . . . . . . . . . . . . . . . . . . . . . . . . . 9
CONTROL WIRING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
HEAT ANTICIPATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
BLOWER MOTOR SPEED SELECTION . . . . . . . . . . . . . . . . . 9
MOTOR TERMINAL IDENTIFICATION . . . . . . . . . . . . . . . . . 10
BLOWER TIMINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
PRE-OPERATIONAL CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . 12
SEQUENCE OF OPERATION. . . . . . . . . . . . . . . . . . . . . . . . . . . 12
FURNACE OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . 13
GAS SHUTOFF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
INSTALLATION CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
CHECKING GAS INPUT RATE . . . . . . . . . . . . . . . . . . . . . . . 13
HIGH ALTITUDE ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . 13
HOW TO DETERMINE GAS INPUT RATE . . . . . . . . . . . . . . . . 14
CONVERSION INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . 14
MINOR INPUT ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . 14
MEASURING AIR TEMPERATURE RISE . . . . . . . . . . . . . . . 14
BLOWER REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
IGNITION FURNACES
MODELS: G8C
50 THUR 125 MBH OUTPUT
EFFICI ENCY
RATING
CERTIFIED
®
CAUTION: READ ALL SAFETY GUIDES BEFORE YOU
START TO INSTALL YOUR FURNACE.
SAVE THIS MANUAL
035-15881-402 REV. A (1199) 650.67-N2V
650.67-N2V 035-15881-402 REV. A (1199)
GENERAL INFORMATION
NOTE:
The words "shall" or "must" indicate a requirement
which is essential to satisfactory and safe perfor-
IMPORTANT -
These instructions are for the use of
qualified individuals specially trained and experienced in
installation of this type equipment and related system compo-
nents.
Installation and service personnel are required by some
states to be licensed.
Persons not qualified shall not install this equipment nor interpret these instructions.
NOTE:
mance.
The words "should" or "may" indicate a recommendation or advice which is not essential and not
required but which may be useful or helpful.
After installing the furnace, show the user how to
turn off the electrical power and gas supply to the
furnace. Make sure that the user understands the
importance of following all safety rules.
SPECIFICATIONS
*CHASSIS SIZE
BTUH INPUT
Small Large
X 50,000 10” x 7” 30-60 1400 160 1/2
X 75,000 10” x 7” 35-65 1400 165 1/2
X 100,000 10” x 7” 45-75 1400 175 1/2
X 75,000 12” x 12” 30-60 2070 160 3/4
X 100,000 12” x 12” 35-65 2070 165 3/4
X 125,000 12” x 12” 40-70 2070 170 3/4
BLOWER
WHEEL SIZE
TEMPERATURE
RISE ºF
CFM HIGH @
0.5” W.C.
MAX. OUTLET
TEMPERATURE ºF
MOTOR HP
*BLOWER PERFORMANCE FOR SMALL CHASSIS OUTDOOR FURNACES
FACTORY EQUIPPED STANDARD BLOWERS
STANDARD CFM AT EXTERNAL STATIC PRESSURE
Blower Speed .1 .2 .3 .4 .5 .6 .7 .8
HIGH 1612 1560 1508 1453 1400 1330 1261 1186
MEDIUM 1303 1281 1258 1226 1195 1147 1100 1035
LOW 788 786 785 774 763 738 712 668
*BLOWER PERFORMANCE FOR LARGE CHASSIS OUTDOOR FURNACES
FACTORY EQUIPPED STANDARD BLOWERS
STANDARD CFM AT EXTERNAL STATIC PRESSURE
Blower Speed .1 .2 .3 .4 .5 .6 .7 .8
HIGH 2300 2250 2210 2140 2070 2030 1945 1775
MEDIUM HIGH 1660 1645 1620 1605 1585 1515 1480 1360
MEDIUM LOW 1440 1420 1385 1375 1360 1305 1280 1210
LOW 1265 1250 1240 1235 1200 1190 1135 1050
* See Figure 1 to determine chassis size.
2 Unitary Products Group
035-15881-402 REV. A (1199) 650.67-N2V
PRE-INSTALLATION INSPECTION
Inspect the shipping container and furnace for any evidence
of shipping damage. If furnace damage is found, notify freight
carrier and file claim.
SIDE
B
SIDE
BACK
C
W
L
CODE COMPLIANCE
The furnace described in these instructions is Design Certified by the American Gas Association to be in compliance
with the latest edition of American National Standard Z21.47.
In Canada, these furnaces are Design Certified by the Canadian Gas Association to be in compliance with the latest edition of CAN/CGA2.3. (See Figure 1.)
CHASSIS SIZE
H
A
D
LETTER
A
B
C
D
H
W
L
SMALL
18”
12”
18”
25-5/8”
27-3/16”
23-3/8”
45-3/32”
LARGE
22”
14”
24”
29-7/16”
31”
25”
48”
FIGURE 1 :
FURNACE DIMENSIONS
These furnaces are of the forced air type and are to be
installed out of doors only. They are acceptable for either
buildings constructed on site, modular, or manufactured
(mobile) homes by following the proper codes.
For site-built homes:
This furnace must be installed in
accordance with these instructions, and local or state code.
In the absence of local codes, follow the latest edition of the
standard NATIONAL FUEL GAS CODE - ANSI Z223.1, AND
NATIONAL ELECTRICAL CODE, ANSI/NFPA 70 and/or
CAN/CGA B149 INSTALLATION CODES when in Canada.
For manufactured (mobile) homes:
This furnace must be
installed in accordance with these instructions, and the MANUFACTURED HOME CONSTRUCTION AND SAFETY
STANDARD, TITLE 24CFR, PART 3280 or, when such standard is not applicable, the STANDARD FOR MANUFACTURED HOME INSTALLATION (Manufactured Home Sites,
Communities, and Set-Ups), ANSIA225.1, or the CAN/CSAZ240 MH, Series M86 Canadian Standard for Mobile Homes.
It is important to consult your local code authorities before
installation is made. The manufacturer assumes no responsibility for equipment installed in violation of any code or regulation.
FURNACE LOCATION
This furnace is Design Certified for outdoor installation only,
and can be mounted on a slab or roof top. They are suitable
for manufactured (mobile) homes when used with a slab only.
They are not to be installed within any part of a structure such
as an attic, crawl space, closet, etc.
The unit may be installed directly on wood flooring or on class
A, B, or C roof covering materials.
DO NOT make any flue or chimney connections to
this unit other than the factory provided exhaust
and air inlet hood assemblies. DO NOT vent the
flue outlet underneath any structure. The flue outlet must not discharge less than two feet away
from any window or door, and must also not discharge less than three feet from any motor-driven
air intake discharging into habitable areas. The
flue outlet and combustion air inlet must not be
blocked or closed for any reason.
Unitary Products Group 3
650.67-N2V 035-15881-402 REV. A (1199)
CLEARANCE TO COMBUSTIBLE MATERIALS
Proper clearances from the furnace to any combustible materials must be maintained. These required minimum clearances are shown below and on a label in the furnace.
Minimum Clearances:
Duct Side . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 inches
Back: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0 inches
Sides: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36 inches
Top: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48 inches
Bottom. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0 inches
In Canada, it is recommended that the outlet duct be provided with a removable access panel. This opening shall be
accessible when the furnace is installed in service, and shall
allow the observance of smoke or reflected light inside the
casing to indicate the presence of leaks in the heat
exchanger. The removable access panel when installed, shall
provide an adequate seal.
OUTSIDE SLAB INSTALLATION
1. Select a location where water drainage cannot collect
around the unit.
2. Provide a level slab extending at least 1" beyond all four
sides of the furnace, and air conditioner (if provided as a
system). The slab should be at least 3-5" thick and
should be isolated from the foundation wall.
3. The location of the unit should be such as to provide
proper access for inspection, servicing and clearance
from combustibles.
Provide sufficient space around and in front of the furnace for
service and cleaning. Allow a minimum of 36 inches from the
sides of the furnace for service clearance.
Adequate ventilation and combustion air must be
provided to insure satisfactory and safe operation
of the furnace. DO NOT make any flue or chimney
connections to this unit other than the factory provided exhaust and air inlet hood assemblies. DO
NOT vent the flue outlet underneath any structure.
The flue outlet and combustion air inlet must not
be blocked or closed for any reason. Failure to
observe the recommendation could result in
asphyxiation.
DO NOT store or use halogen emitting substances
in the vicinity of this appliance. Such substances
include chlorine based cleaners and swimming
pool chemicals, water softening chemicals, deicing salts and chemicals, cleaning solvents such
as carbon tetrachloride or perchloroethylene, halogen type refrigerants, printing inks, paint and paint
removers, varnishes, hydrochloric acid, cements
and glues, and masonry acid washing materials.
the air used by the burner for combustion must be
free of halogens to avoid possible corrosion to the
heating surfaces which could result in asphyxiation.
IMPORTANT -
struction heater to supply heat to an unfinished building during the finishing phases of construction. This practice
exposes the furnace to abnormally low return air temperatures which can cause condensation in the furnace or vent
leading to premature failure. This practice also exposes the
furnace to an abnormally corrosive atmosphere from sources
such as paint, varnish and adhesives, which can lead to premature heat exchanger or vent failure.
This furnace is not to be used as a con-
Failure to maintain proper clearances to combustible materials can cause a fire, which could result
in damage, death or personal injury.
COMBUSTION AND VENTILATION AIR
INSTALLATION OF EXHAUST AND INTAKE-AIR
HOOD ASSEMBLIES
1. Remove the paper wrapped exhaust hood and intake air
hood from the heat exchanger compartment. Also locate
the envelope containing eleven #10 sheet metal screws
needed for the installation. (See Figure 2.)
2. Use four of the screws to attach the exhaust hood
assembly to the cabinet, and the remaining seven to
attach the intake air hood. (See Figure 2.)
4 Unitary Products Group
The practice also allows foreign materials such as sawdust or
sheetrock dust to enter the furnace blower, burner, heat
exchanger, motors, and vent system resulting in shorter life of
the furnace. Use of this furnace as a construction heater will
void the warranty.
035-15881-402 REV. A (1199) 650.67-N2V
EXHAUST HOOD
ASSEMBLY
#10 x 3/8
SCREW x4
#10 x 3/8
SCREW x7
INTAKE
AIR HOOD
FIGURE 2 :
EXTERNAL VIEW OF FURNACE WITH VENT HOOD ASSEMBLY
FURNACE SIZING AND DUCT SYSTEM
DESIGN
The duct system must be installed in conformance with
ASHRAE/NFPA 90, Standard for Installation of Warm Air
Heating and Air Systems and other applicable local codes.
Failure to adhere to proper duct system design standards can
reduce airflow, resulting in reduced system performance and
possible furnace damage.
Consideration should be given to the heating capacity
required and also the air quantity (CFM) required if A/C is to
be installed along with the furnace or at some future time.
These factors can be determined by calculating the heat loss
and heat gain of the home or structure.
If these calculations are not performed and the furnace is
oversized, the following may result:
1. Short cycling of the furnace.
2. Wide temperature fluctuations from the thermostat setting.
3. Reduced overall operating efficiency of the furnace.
The supply and return duct system must be of adequate size
and designed such that the furnace will operate within the
designed air temperature rise range and not exceed the maximum designed static pressure. These values are listed in
Table 1:
Tab l e 1 :
STATIC PRESSURE
INPUT
BTUH
50,000 .10 .50
75,000 3.12 .50
100,000 .15 .50
125,000 .20 .50
EXT. STATIC W.C.
MINIMUM MAXIMUM
The return air system must be designed and
installed so that negative pressure created by the
air circulating fan cannot affect another appliance’s combustion air supply (such as a water
heater), or act to mix products of combustion with
circulating air.
Additional information, values and data necessary for heat
loss, heat gain and duct system design may be found in
ASHRAE HANDBOOK OF FUNDAMENTALS-1993 EDITION
or in other nationally recognized publications recognized by
municipal, state, provincial and federal code authorities.
Unitary Products Group 5
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