Sterling QVF 100, QVF 125, QVF 150, QVF 175, QVF 200 Installation Instructions & Parts List
...
(S) IIPLM-20
INSTALLATION INSTRUCTIONS & PARTS LIST
STERLING GAS FIRED PROPELLER UNIT HEATERS
ATTENTION: READ THIS MANUAL AND ALL LABELS ATTACHED TO THE UNIT CAREFULLY BEFORE
ATTEMPTING TO INSTALL, OPERATE OR SERVICE THESE UNITS! CHECK UNIT DATA PLATE FOR TYPE OF
GAS AND ELECTRICAL SPECIFICATIONS AND MAKE CERTAIN THAT THESE AGREE WITH THOSE AT POINT OF
INSTALLATION. RECORD THE UNIT MODEL AND SERIAL No.(s) IN THE SPACE PROVIDED. RETAIN FOR FUTURE
REFERENCE.
J30-05367
Model No.
Serial No.
FOR YOUR SAFETY
The use and storage of gasoline or other ß ammable vapors and liquids in open containers in
the vicinity of this appliance is hazardous.
FOR YOUR SAFETY
If you smell gas
1
. Open windows.
:
2. DonÕt touch electrical switches.
3. Extinguish any open ß ame.
4
. Immediately call your gas supplier.
Improper installation, adjustment, alteration, service or maintenance
can cause property damage, injury or death. Read the installation, operating and
maintenance instructions thoroughly before installing or servicing this equipment.
APPROVED FOR USE IN CALIFORNIA WHEN EQUIPPED WITH SPARK IGNITION.
Install, operate and maintain unit in accordance with manufacturer's
instructions to avoid exposure to fuel substances or substances from incomplete
combustion which can cause death or serious illness. The state of California
has determined that these substances may cause cancer, birth defects, or other
reproductive harm.
Installer Please Note:
This equipment has been test fired and inspected. It has been
shipped free from defects from our factory. However, during shipment and installation,
problems such as loose wires, leaks or loose fasteners may occur.
responsibility to inspect and correct any problems that may be found.
RECEIVING INSTRUCTIONS
Inspect shipment immediately when
received to determine if any damage
has occurred to the unit during
shipment. After the unit has been
uncrated, check for any visible
damage to the unit. If any damage
is found, the consignee should sign
the bill of lading indicating such
damage and immediately file claim
for damage with the transportation
company.
10/
07
INSTALLER'S RESPONSIBILITY
260 NORTH ELM ST., WESTFIELD, MA 01085
TEL: (413) 564-5540 FAX: (41
www
.sterlinghvac.com
MODELS: QVF (30, 45, 60, 75, 100, 125, 150,
175,
200, 225, 250, 300, 350, 400) (S,M)
It is the installer's
HVAC PRODUCTS
3) 562-53
11
TABLE OF CONTENTS
SPECIFICATIONS
Basic Description ....................................................
Performance & SpeciÞ cation Data .......................... 4
SAFETY INFORMATION
Installation Codes ...............................................2, 3
Special Precautions ............................................2, 3
INSTALLATION
Locating Units .........................................................3
Proper Clearances .......................................... 3, 5, 6
Combustion Air .......................................................6
Suspension of Units ............................................ 5, 6
Gas Supply Piping ..................................................7
Pipe Installation ......................................................8
VENTING .....................................................................9
NOTICE: It is the owner’s responsibility to provide any scaffolding or other apparatus required to perform
emergency service or annual/periodic maintenance to this equipment.
ELECTRICAL CONNECTIONS .................................10
EXPLANATION OF CONTROLS/OPERATION
2
Standing Pilot .................................................11, 12
Spark Ignition ..................................................13, 14
Main Burner OriÞ ce Schedule ...............................15
Adjustments ....................................................15, 16
MAINTENANCE
Servicing & Cleaning ............................................16
IDENTIFICATION OF PARTS ...................................17
TROUBLESHOOTING GUIDE ................18, 19, 20, 21
REPLACEMENT PARTS ..........................................
WARRANTY ..............................................................
INSPECTION SHEET ...............................................23
22
22
DESCRIPTION
The gas unit heater is a factory assembled, low static
pressure type propeller fan heater designed to be
suspended within the space to be heated. THESE
HEATERS ARE NOT TO BE CONNECTED TO
DUCTWORK. The designs are certified by CSA
International as providing a minimum of 80% thermal
efficiency, and approved for use in California when
equipped with spark ignition.
in any way.
manual, contact the manufacturer.
If you have any questions after reading this
Do not alter these units
Figure 1
Front
View
The following terms are used throughout this manual, in addition to CSA International requirements, to bring attention
to the presence of potential hazards or to important information concerning the product:
Indicates an imminently hazardous
situation which, if not avoided, will result in death,
serious injury or substantial property damage.
PROPELLER UNIT HEATER
Rear
View
See IdentiÞ cation of Parts section
for unit components.
Indicates an imminently hazardous
situation which, if not avoided, may result in minor
injury or property damage.
Indicates an imminently hazardous
situation which, if not avoided, could result in
death, serious injury or substantial property
damage.
NOTICE: Used to notify of special instructions on
installation, operation or maintenance which are
important to equipment but not related to personal
injury hazards.
2
GENERAL SAFETY INFORMATION
Failure to comply with the general
safety information may result in extensive
property damage, severe personal injury or
death.
This product must be installed by
a licensed plumber or gas fi tter when installed
within the Commonwealth of Massachusetts.
Installation must be made in accordance with local
codes, or in absence of local codes, with the latest
edition of ANSI Standard Z223.1 (N.F.P.A. No. 54)
National Fuel Gas Code.
All of the ANSI and NFPA
Standards referred to in these installation instructions
are those that were applicable at the time the design
of this appliance was certified. The ANSI Standards
are available from the American National Standards
Institute, Inc., 11 West 42nd Street, New York, NY
10036 or www.ansi.org. The NFPA Standards are
available from the National Fire Protection Association,
Batterymarch Park, Quincy, MA 02269. These unit
heaters are designed for use in airplane hangars when
installed in accordance with ANSI/NFPA No. 409 and in
public garages when installed in accordance with NFPA
No. 88A and NFPA No. 88B.
If installed in Canada, the installation must conform
with local building codes, or in absence of local building
codes, with CGA-B149.1 ÒInstallation Codes for Natural
Gas Burning Appliances and EquipmentÓ or CGA-B149.2
ÒInstallation Codes for Propane Gas Burning Appliances
and EquipmentÓ. These unit heaters have been designed
and certiÞ ed to comply with CGA 2.6. Also see sections
on installation in AIRCRAFT HANGARS and PUBLIC
GARAGES.
Do not alter the unit heater in any
way or damage to the unit and/or severe personal
injury or death may occur!
Disconnect all power and gas
supplies before installing or servicing the heater.
If the power disconnect is out of sight, lock
it in the open position and tag it to prevent
unexpected application of power. Failure to do
so could result in fatal electric shock, or severe
personal injury.
Insure that all power sources conform
to the requirements of the unit heater or damage to
the unit will result!
Follow installation instructions CAREFULLY to avoid
creating unsafe conditions. All external wiring must
conform to applicable current local codes, and to the
latest edition of the National Electric Code ANSI/NFPA
No. 70. In Canada, all external wiring must conform to
the Canadian Electric Code, Part 1 CSA Standard C22.1.
All wiring should be done and checked by a qualified
electrician, using copper wire only. All gas connections
should be made and leak-tested by a suitably qualiÞ ed
individual, per instructions in this manual.
Use only the fuel for which the heater is designed (see
rating plate). Using LP gas in a heater that requires natural
gas, or vice versa, will create the risk of gas leaks, carbon
monoxide poisoning and explosion.
Do not attempt to convert the
heater for use with a fuel other than the one
intended. Such conversion is dangerous, as it
will create the risks listed previously.
Make certain that the power source conforms to the
electrical requirements of the heater.
Do not depend upon a thermostat
or other switch as sole means of disconnecting
power when installing or servicing heater. Always
disconnect power at main circuit breaker as
described above. Failure to do so could result in
fatal electric shock.
Special attention must be given to any grounding
information pertaining to this heater. To prevent the risk of
electrocution, the heater must be securely and adequately
grounded. This should be accomplished by connecting a
grounded conductor between the service panel and the
heater. To ensure a proper ground, the grounding means
must be tested by a qualiÞ ed electrician.
Do not insert Þ ngers or foreign objects into the heater
or its air moving device. Do not block or tamper with the
heater in any manner while in operation or just after it
has been turned off, as some parts may be hot enough
to cause injury.
This heater is intended for general heating applications
ONLY. It must NOT be used in potentially dangerous
locations such as ß ammable, explosive, chemical-laden
or wet atmospheres.
Do not attach ductwork to this product or use it as a
makeup air heater. Such usage voids the warranty and
will create unsafe operation.
In cases in which property damage may result from
malfunction of the heater, a backup system or a
temperature sensitive alarm should be used.
The open end of piping systems being
purged shall not discharge into areas where there
are sources of ignition or into confined spaces
UNLESS precautions are taken as follows: (1) By
ventilation of the space, (2) control of purging rate,
(3) elimination of all hazardous conditions. All
precautions must be taken to perform this operation
in a safe manner!
Unless otherwise speciÞ ed, the following conversions
may be used for calculating SI unit measurements:
1 gallon = 3.785 L
1 foot = 0.305 m
1 inch = 25.4 mm
1 psig = 6.894 kPa
1 pound = 0.453 kg
liter/second = CFM x 0.472
meter/second = FPM Ö 196.8
1000 Btu per hour = 0.293 kW
1000 Btu/Cu. Ft. = 37.5 MJ/m
1 inch water column = 0.249 kPa
1 cubic foot = 0.028 m
3
3
3
Table 1 - STANDARD PROPELLER TYPE UNIT HEATERS
Unit Size 30 45 60 75 100 125 150 175 200 225 250 300 350 400
PERFORMANCE DATA
Input (BTU/Hr)
Output (BTU/Hr)
Thermal EfÞ c
Fr
ee Air Delivery
Air Temperature Rise (F Deg.)
(C De
Outl
Full Load Amps a
MOTOR DATA : Motor HP
DIMENSIONAL DATA
ÒAÓ Heigh
ÒBÓ Width of
ÒCÓ Heigh
ÒDÓ Depth to Rear of Housing
ÒEÓ Hanging Distance Width
ÒFÓ Discharge Op
ÒGÓ Depth to
ÒHÓ Discharge Op
ÒLÓ Hanger Locatio
ÒSÓ Flu
(Dia-mm)
Flue Typ
Fan Diam
Gas Inlet-Nat
Gas Inlet- LP Gas (in.)
Approx. Shipping Wt. (lb.)
N
et Unit Weight (lb.) 5
***
***
These
***
R =
***
30
*
(kW)
24
(kW)
iency %
(CFM)
700 800 1050 1100 1480 1650 2200 2530 2640 2700 3100 4400 5000 5300
(cu. m/s)
et Ve
locity (FPM)
t to
t to
e Size (Dia-in.)
e
eter (in.) 12 12 14 14 14 16 16 18 18 1
Ra
tings
For u
e
ach
1,000 ft. (305m) above sea
level; refer to
of the National Fuel Gas Code, ANSI Stan
For
inst
ignored. At altitudes of 2,000 to 4,500 ft. (610 to 1372
n
ormal al
Round; OV =
700 750 640 672
(m/s)
t 115V 2.1 2.1 2.1 2.1 3.4 3.6 4.8 5.8 5.8 5.8 5.8
**
Motor kW (0.
Motor Type***
R.P.M.
1
Amps @
in
Top of
Unit 14 14 17-1/2 17-1/2 17-7/8 20-5/8 20-5/8 23-3/8 26-1/8 28-7/8
Top of Hanger
Unit Side Jack
.(mm)
Unit 25-3/4 25-3/4 25-3/4 25-3/4 31-1/4 31-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4 36-1/4
ening Width 10 10 15-1/2 15-1/2 15-3/8 18-1/8
ening Height 16-1/4 16-1/4 16-1/4 16-1/4 18 18 18 18 18 1
n 11-7/8 11-7/8 11-1/2 11-1/2 15-1/8 15-1/8 15-1/8 15-1/8 15-1/8 16-1/4 16-1/4 16-1/4 16-1/4 16-1/4
4 4 5 5 6 6 7 7
***
ural Gas (in.) 1
1
72
(kg)
(kg)
shown are
nit inst
allations
local codes, or
allations
in Can
titude rating, and be so
amps are based on standing pilot unit
Oval; H =
,
000 45,000 60,000 75,000 100,000 125,000 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000
(8.8) (13.2) (17.6) (22.0) (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (
,
300 36,450 48,600 60,750 80,000 100,000 120,000 140,000 160,000 180,000 200,000 240,000 280,000 320,000
(7.1) (10.7) (14.2) (17.8) (23.4) (29.3) (35.1) (41.
8
1 81
(0.
330) (0.378) (0.496) (0.519) (0.6
30 42 42 50 50 56 50 51 56 61 60 50 52 56
g.) (17) (23) (23) (28) (28) (31) (28) (28) (31)
(3.6) (3.8) (3.3) (3.4) (4.8) (4.6) (5.3) (5.4) (5.1) (4.8) (5.0)
1/30 1/30 1/30 1/30 1/20 1/10 1/4 1/3 1/3 1/3 1/3 2@1/4 2@1/3 2@1/3
025) (0.025) (0.025) (0.025) (0.037) (0.075) (0.186) (0.249) (0.249) (0.249) (0.249) (0.186) (0.249) (0.24
SP SP SP SP SP SP
,
050 1,050 1,050 1,050 1,050 1,050 1,140 1,140 1,140 1,140 1,140 1,140 1,140 1,140
115V 1.3 1.3 1.3 1.3 2.6 2.8 4.0 4.5 4.5 4.5 4.5
(
654) (654) (654) (654) (794) (794) (921) (921) (921)
(
356) (356) (444) (444) (454) (524) (524) (594) (664) (733) (803)
27-1/2 27-1/2 27-1/2 27-1/2 33-1/4 33-1/4 38-1/
(698) (698) (698) (698) (845) (845) (972) (972) (972) (994) (994) (994) (994) (994)
27-5/8 27-5/8 27-5/8 27-5/8 32-1/2 32-1/2 36 36 36 38-1/
(
702) (702) (702) (702) (826) (826) (914) (914) (914)
8-5/8 8-5/8
(219) (219) (359) (359) (
(
254) (254) (394) (394) (391) (460) (460) (530) (600) (670) (740)
et 19-3/8 19-3/8 19-3/8
(492) (492) (492) (492) (679) (679) (679) (679) (679) (679) (679) (679) (679) (679)
(
413) (413) (413) (413) (457) (457) (457) (457) (457) (457) (457) (457) (457) (457
(
302) (302) (292) (292) (384) (384) (384) (384) (384) (413) (413) (413) (413) (413
(
102) (102) (127) (127) (152) (152) (178) (178) (203) (203) (203) (254) (254) (305
R,V R,V R,V R,V R,V R,V R,H R,H R,H
/
2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4
/
2 1/2 1/2 1/2 1/2 1/2 1/2 1/2 1/2
(33) (37) (44) (47) (81) (91) (95) (
9
69
(27) (31) (38) (41) (67) (76) (79) (89) (98) (108) (118) (138) (
for u
nit inst
in U.S
allations a
.A. abov
e 2,000 ft. (610
in absence of
ada, any referenc
marked
Horizontal; SP = S
8
1
8
1
8
0
8
0
8
0
99) (0.779) (1.038) (1.194) (1.
9
50 900 1045 1070 1000
PSC PSC PSC PSC PSC PSC PSC PSC
14-1/8 14-1/8 14-3/4 17-1/2 17-1/2 20-1/4 23 25-1/2 28-1/
19-3/8
8
2
98
104 178 200 209 232 242 279 301 356 415 451
8
4
t elevations between 0 and 2,000 ft. (610
m), the u
local codes, refer to the lates
dard Z
e to deration in excess of 2,
in
m), the u
accordance with the CSA certiÞ cation.
s.
haded Pole; PSC = Perma
375) (444) (444) (514) (584) (648) (718)
26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4 26-3/4
9
0 148 168 175 196 216 239 261 304 340 376
nit input
must be derated 4% for
223.1 (N
000 ft. (610m) are to be
nit
must be derated to 90% of th
nent Split
18-1/8
m).
t edition
.F.P.A. No. 54
Capacitor.
).
e
0) (46
8
0
4 38-1/
20-7/8 23-5/8 26-3/8 29-1/8
105) (110) (127) (137) (161) (1
.9) (52.7) (58.6) (70.3) (82.0) (93.7)
8
0
246) (1.274) (1.463) (2.077) (2.360) (2.502
4 38-1/
4 39-1/8
8
▲
See special details below for
102.5) (117.1
8
0
8
0
8
0
8
0
8
(34) (33)
9
50
(921) (921) (921) (921) (921)
(972) (972) (959) (972) (972)
8
18 18 1
8
R,H R,H OV,H OV,H OV,H
8
18 2@16 2@18 2@1
←
1
(28)
98
0 1100 1150 1050
(5.6) (5
8.8
8.
31-5/8 37-1/8 42-5/8 48-1/8
39-1/8
4 38-1/
(943) (1083) (
39-1/8
4 37-3/4 38-1/
4 33-3/4 39-1/
(857) (997) (
34-5/8 40-1/8 45-5/8
(879) (
8
10 10 12
/2 OR 3/
400 ventin
(29) (31)
.8) (5.3)
10.8 10
0
9.
0
39-1/8
4
g.
1222
39-1/8
4 38-1/
4 44-3/4
1137
1019) (115
8
1
88) (
154) (171
9.
→
205
)
0
)
.8
9)
0
)
4
)
9)
8
)
)
▲
)
8
)
)
Figure 1A
4
INSTALLATION
Do not install unit heaters in
corrosive or fl ammable atmospheres! Premature
failure of, or severe damage to the unit will result!
Avoid locations where extreme
drafts can affect burner operation. Unit heaters
must not be installed in locations where air for
combustion would contain chlorinated, halogenated or acidic vapors. If located in such an
environment, premature failure of the unit will
occur!
When the unit is equipped with an automatic gas ignition
system, the unit heater must be installed such that the
gas ignition control system is not directly exposed to
water spray, rain or dripping water.
NOTICE: Location of unit heaters is related directly
to the selection of sizes (see Figure 2). Basic rules
are as follows:
Figure 2 - Heater Location
ofÞ ces and other sections of the hangar where aircraft
are not stored or housed. Refer to current ANSI/NFPA
N
o. 409, Aircraft Hangars. In Canada, installation is
suitable in aircraft hangars when acceptable to the
enforcing authorities.
PUBLIC GARAGES: In repair garages, unit heaters must
be at least 8 feet (2.4m) above the ß oor. Refer to the latest
edition of
I
n parking structures, unit heaters must be installed
NFPA No.
88B, Repair Garages.
so that the burner flames are located a minimum of
18
inches (457mm) above the floor or protected by a
partition not less than 18 inches (457mm) high. However,
any unit heater mounted in a parking structure less than
8 f
t. (2.4m) above the floor must be equipped with an
OSHA
approved fan guard. Refer to the latest edition of
NFPA
88A, Park
In C
anada, installation must be in accordance to the
latest edition of CGA-B
B
urning Appliances and Equipment.Ó
ing Structures.
149 ÒInstallation Codes for Gas
AIR DISTRIBUTION: D
maximum heat loss. When multiple heaters are involved,
circulation of air around the perimeter is recommended
where heated air ß ows along exposed walls. Satisfactory
results can also be obtained where multiple heaters are
D
2787
located toward the center of the area with heated air
directed toward the outside walls. Be careful to avoid
MOUNTING HEIGHT: U
nit Heaters must be installed at
a minimum of 8 feet (2.4m) above the ß oor, measured
to the bottom of the unit. At heights above 8 feet (2.4m),
less efÞ cient air distribution will result. Occasionally unit
heaters must be mounted at heights of 12 to 16 feet (3.7
all obstacles and obstructions which could impede the
warm air distribution patterns. Heat throw distances are
presented in Figure 2 and Table 2.
Figure 2A - Heat Throw Distances
to 4.9m) in order to clear obstacles. When this is the case,
it is advisable to use centrifugal blower unit heaters.
AIRCRAFT HANGARS: Unit Heaters must be installed
in aircraft hangars and public garages as follows: In
aircraft hangars, unit heaters must be at least 10 f
(3.1m)
above the upper surface of wings or engine
eet
“H”
enclosures of the highest aircraft to be stored in the
hangar and 8 feet (2.4m) above the floor in shops,
Table 2 - Standard Applications - Heat Throw Distances (Approximate) (see Figure 2A)
UNIT SIZE BTU/Hr (kW
“H”
f
t. 30,000 45,000 60,
(m)
8
(2.4) (10.1) (10.1) (10.1) (12.2) (18.3)
10
(3.0) (8.5) (8.5) (8.5) (10.7)
12
(3.7)
15
(4.6)
20
(6.1)
NR = N
(8.8) (13.2) (17.6) (22.0)
33
33
28
28
NR
NR
NR
NR
NR
NR
ot recommended
000 75,000 100,
33
28
NR
NR
NR
H = D
000 125,000 150,000 175,000 200,
(29.3) (36.6) (43
40
3
NR
NR
NR
istance from ß oor to bottom of the unit.
60
5 54 5
(16.5) (17.1)
44
(13.4) (14.0) (20.7) (17.4) (18.6) (19.8) (20.
NR
NR
6
5
(19.8) (21.3) (22.9) (24.4) (25.9) (27.4) (32.0)
6
46
NR
NR
9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1)
.
70
60
(18.3) (19.5) (20.7)
49
5
4
5
(22.6) (14.9) (15.8) (17.1) (18.3) (21.3) (22.6) (24.4)
NR
)
7
5
64
7
49
52 56
NR
(14.0) (15.2)
irect air towards areas of
D430
6
000 225,000 250,000 300,
80
68
61
46
8
5
72
(21.9) (23.8) (27.4) (29.0) (30.5)
6
5
50 5
90
78
68
7) (24.4) (25.6) (27.4)
60
4
(16.5) (19.2) (20.1)
000 350,000 400,
105
90
80
70
63
000
110
(33.5) (36.6)
12
9
5
1
00
84
9
0
74
8
0
66
7
0
(21.3)
0
5
INSTALLATION (continued)
The installation is to be adjusted to obtain an air
throughput within the range specified on the rating
plate.
Unit heaters should not be installed to maintain low
temperatures and/or freeze protection of buildings.
A minimum of 50°F (10°C) thermostat setting must
be maintained. If unit heaters are operated to maintain
lower than
50¡F (10¡C),
hot flue gases are cooled
inside the heat exchanger to a point where water
v
apor (a ß ue gas by-product) condenses onto the heat
exchanger walls. The result is a mildly corrosive acid that
prematurely corrodes the aluminized heat exchanger and
can actually drip water down from the unit heater onto
ß
oor surface. Additional unit heaters should be installed
if a minimum
m
aintained.
50¡F (10¡C)
thermostat setting cannot be
AIR FOR COMBUSTION: The Unit Heater shall be
installed in a location in which the facilities for
ventilation permit satisfactory combustion of gas,
proper venting, and the maintenance of ambient
temperature at safe limits under normal conditions of
use.
The Unit Heater shall be located in such a manner
as not to interfere with proper circulation of air within the
conÞ ned space. When buildings are so tight that normal
inÞ ltration does not meet air requirements, outside air
shall be introduced per Sections 1.3.4.2 and 1.3.4.3 of
ANSI Z223.1
for combustion requirements. A permanent
opening or openings having a total free area of not less
than one square inch per
5,000 BTU/HR. (1.5 Kw)
of
total input rating of all appliances within the space shall
be provided.
Make certain that the structure
to which the heater is to be mounted is capable
of safely supporting its weight. Under no
circumstances must the gas lines, venting system
or the electrical conduit be used to support the
heater; or should any other objects (i.e. ladder,
person) lean against the heater, gas lines, venting
system or electrical conduit for support. Failure
to heed these warnings may result in property
damage, personal injury or death.
Unit heaters must be hung level from
side to side and from front to back; see Figures
1 through 4. Failure to do so will result in poor
performance and or premature failure of the unit.
Insure that all hardware used in
the suspension or each unit heater is more than
adequate for the job. Failure to do so may result
in extensive property damage, severe personal
injury or death!
Refer to Figures 1 through 4, and dimensional data
per Table 1 for suspension of units.
Figure 3 - Heater Mounting*
NOTICE: Unit heater sizing should be based on heat
loss calculations where the unit heater output equals
or exceeds heat loss.
CLEARANCES: Each Gas Unit Heater shall be located
with respect to building construction and other equipment
so as to permit access to the Unit Heater. Clearance
between walls and the vertical sides of the Unit Heater
shall be no less than 18
clearance of 6 inches
inches (457
(152mm) m
mm). A m
inimum
ust be maintained
between the top of the Unit Heater and the ceiling. The
bottom of the Unit Heater must be no less than 12
(305mm)
from any combustible. However, in order to
inches
insure access to the burner compartment, a minimum
distance of 21
inches (533
mm)
is required. The distance
between the flue collector and any combustible must
be no less than 6 inches
COMBUSTION
and VENTING
(152mm). A
sections.
lso see AIR FOR
NOTICE: Increasing the clearance distances may
be necessary if there is a possibility of distortion or
discoloration of adjacent materials.
*All hanging hardware and wood is not included with the unit
(To be fi eld supplied).
Figure 4 - Heater Mounting 100/400 MBTU Sizes
Unit Sizes
6
INSTALLATION – GAS SUPPLY PIPING/SIZING
To avoid equipment damage or possible personal injury, do not connect gas piping
to this unit until a supply line pressure/leak test has been completed. Connecting the unit before
completing the pressure/leak test may damage the unit gas valve and result in a fi re hazard.
Do not rely on a shut off valve to isolate the unit while conducting gas pressure/leak tests. These
valves may not be completely shut off, exposing the unit gas valve to excessive pressure and damage.
PIPE SIZING
To provide adequate gas pressure at the gas unit
heater, size the gas piping as follows:
1. Find the cu ft/hr by using the following formula:
Cu ft/hr
1,000
Input Btu/Hr.
=
2. Refer to table 3. Match ÒLength of Pipe in FeetÓ
with appropriate ÒGas Input - Cu Ft/HrÓ Þ gure. This
Þ gure can then be matched to the pipe size at the
end of the column.
Example: It is determined that a 67 foot (20.4m) run of
gas pipe is required to connect a 200 MBTU gas unit
heater to a 1,000 Btu/cu. ft (0.29 kW) natural gas supply.
200,000 Btu/hr
=
200 Cu ft/hr
1,000 Btu/cu ft
Using Table 3, a 1 inch pipe is needed.
NOTICE: See General Safety Information section for
english/SI (metric) unit conversion factors.
NOTICE: If more than one gas unit heater is to be
served by the same piping arrangement, the total
cu ft/hr input and length of pipe must be considered.
NOTICE: If the gas unit heater is to be fi red with LP
gas, see Table 3 or consult the local LP gas dealer for
pipe size information.
NOTICE: HEATER INSTALLATION FOR USE WITH
PROPANE (BOTTLED) GAS MUST BE MADE BY A
QUALIFIED L.P. GAS DEALER OR INSTALLER. HE
WILL INSURE THAT PROPER JOINT COMPOUNDS
ARE USED FOR MAKING PIPE CONNECTIONS;
THAT AIR IS PURGED FROM LINES; THAT A
THOROUGH TEST IS MADE FOR LEAKS BEFORE
OPERATING HEATER; AND THAT IT IS PROPERLY
CONNECTED TO PROPANE GAS SUPPLY SYSTEM.
Before any connection is made to an existing line
supplying other gas appliances, contact the local gas
company to make certain that the existing line is of
adequate size to handle the combined load.
Maximum Capacity of Pipe in Cubic Feet of Gas per Hour (Cubic Meters per Hour) for Gas Pressures of 0.5 psig (3.5 kPa) or Less,
and a Pressure Drop of 0.5 Inch Water Column (124.4 Pa)
(Based on a 0.60 SpeciÞ c Gravity Gas)
Nominal
Iron Internal
Pipe Size
in. in. (3.0) (6.1) (9.1) (12.2) (15.2) (18.3) (21.3) (24.4) (27.4) (30.5) (38.1) (45.7) (53.3) (61.0)
1/2 0.622 175 120 97 82 73 66 61 57 53 50 44 40 37 35
(4.96) (3.40) (2.75) (2.32) (2.07) (1.87) (1.73) (1.61) (1.50) (1.42) (1.25) (1.13) (1.05) (0.99)
3/4 0.824 360 250 200 170 151 138 125 118 110 103 93 84 77 72
(10.2) (7.08) (5.66) (4.81) (4.28) (3.91) (3.54) (3.34) (3.11) (2.92) (2.63) (2.38) (2.18) (2.04)
1 1.049 680 465 375 320 285 260 240 220 205 195 175 160 145 135
(19.3) (13.2) (10.6) (9.06) (8.07) (7.36) (6.80) (6.23) (5.80) (5.52) (4.96) (4.53) (4.11) (3.82)
1 1/4 1.380 1400 950 770 660 580 530 490 460 430 400 360 325 300 280
(39.6) (26.9) (21.8) (18.7) (16.4) (15.0) (13.9) (13.0) (12.2) (11.3) (10.2) (9.20) (8.50) (7.93)
1 1/2 1.610 2100 1460 1180 990 900 810 750 690 650 620 550 500 460 430
(59.5) (41.3) (33.4) (28.0) (25.5) (22.9) (21.2) (19.5) (18.4) (17.6) (15.6) (14.2) (13.0) (12.2)
2 2.067 3950 2750 2200 1900 1680 1520 1400 1300 1220 1150 1020 950 850 800
(112) (77.9) (62.3) (53.8) (47.6) (43.0) (39.6) (36.8) (34.5) (32.6) (28.9) (26.9) (24.1) (22.7)
2 1/2 2.469 6300 4350 3520 3000 2650 2400 2250 2050 1950 1850 1650 1500 1370 1280
(178) (123) (99.7) (85.0) (75.0) (68.0) (63.7) (58.0) (55.2) (52.4) (46.7) (42.5) (38.8) (36.2)
3 3.068 11000 7700 6250 5300 4750 4300 3900 3700 3450 3250 2950 2650 2450 2280
(311) (218) (177) (150) (135) (122) (110) (105) (97.7) (92.0) (83.5) (75.0) (69.4) (64.6)
4 4.026 23000 15800 12800 10900 9700 8800 8100 7500 7200 6700 6000 5500 5000 4600
(651) (447) (362) (309) (275) (249) (229) (212) (204) (190) (170) (156) (142) (130)
1. Determine the required Cu. Ft. / Hr. by dividing the rated heater input by 1000. For SI / Metric measurements: Convert unit Btu. / Hr. to
kilowatts. Multiply the unit input (kW) by 0.0965 to determine Cubic Meters / Hour. 2. FOR NATURAL GAS: Select the pipe size directly
from the table. 3. FOR PROPANE GAS: Multiply the Cu. Ft. / Hr. value by 0.633; then use the table. 4. Refer to the metric conversion
factors listed in General Safety section for more SI unit measurements/conversions.
Length of Pipe, Feet (meters)
10 20 30 40 50 60 70 80 90 100 125 150 175 200
Dia.
Table 3 - Gas Pipe Size
7
PIPE INSTALLATION
1. Install the gas piping in accordance with applicable
local codes.
2. Check gas supply pressure. Each unit heater must
be connected to a manifold pressure and a gas
supply capable of supplying its full rated capacity
(refer to Table 4). A field LP tank regulator must
be used to limit the supply pressure to maximum
of 14 inches W.C. (3.5 kPa). All piping should
be sized in accordance with the latest edition of
ANSI Standard Z223.1 National Fuel Gas Code; in
Canada, according to CGA-B149. See Tables 1 and
3 for correct gas supply piping size. If gas pressure
is excessive on natural gas applications, install a
pressure regulating valve in the line upstream from
the main shutoff valve.
3. Adequately support the piping to prevent strain on
the gas manifold and controls.
4. To prevent the mixing of moisture with gas, run the
take-off piping from the top, or side, of the main.
5. Standard gas unit heaters, optional two-stage units,
and hydraulic modulating units are supplied with a
combination valve which includes:
(a) Manual ÒAÓ valve (b) Manual ÒBÓ valve
(c) Solenoid valve (d) Pilot safety (e) Pressure
regulator. Pipe directly in to combination valve (see
Figure 5).
6. A 1/8" N.P.T. plugged tapping, accessible for test
gauge connection, must be installed immediately
upstream of the gas supply connection to the
appliance.
7. Provide a drip leg in the gas piping near the gas
unit heater. A ground joint union and a manual gas
shutoff valve should be installed ahead of the unit
heater controls to permit servicing. The manual
main shutoff valve must be located external to the
jacket. See Þ gure 5.
8
. Make certain that all connections have been
adequately doped and tightened.
Do not overtighten the inlet gas piping
into the valve. This may cause stresses that would
crack the valve!
NOTICE: Use pipe joint sealant resistant to the
action of liquefied petroleum gases regardless of
gas conducted.
Check all pipe joints for leakage
using a soap solution or other approved method.
Never use an open flame or severe personal
injury or death may occur.
Figure 5 - Pipe Installation, Standard Controls
Never use an open fl ame to detect
gas leaks. Explosive conditions may exist which
would result in personal injury or death.
The appliance and its individual shutoff valve must
be disconnected from the gas supply piping system
during any pressure testing of that system at test
pressures in excess of 1/2 psig (3.5 kPa).
The appliance must be isolated from the gas supply
piping system by closing its individual manual shutoff
valve during any pressure testing of the gas supply
piping system at test pressures equal to or less than
1/2 psig (3.5 kPa).
Table 4 - Gas Piping Requirements
SINGLE STAGE GAS PIPING REQUIREMENTS*
Gas Type
Manifold
Pressure
14.0 in. W.C. Max. 14.0 in. W.C. Max.
Supply Inlet
Pressure
(1.2 kPa) (2.7 kPa)
*
For single stage application only at normal altitudes.
Gas Type
Supply Inlet
Pressure
**For two stage applications only at normal altitudes; two stage
applications do not apply to the 30/75 MBH models.
Natural Gas Propane (LP) Gas
3.5 in. W.C. 10.0 in. W.C.
(0.9 kPa) (2.5 kPa)
(3.5 kPa) (3.5 kPa)
5.0 in. W.C. Min. 11.0 in W.C. Min.
TWO STAGE GAS PIPING REQUIREMENTS**
Natural Gas Propane (LP) Gas
6.5 in. W.C. Min. 11.5 in. W.C. Min.
(1.6 kPa) (2.9 kPa)
8
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