(S) DSTBIM-3
J30-06935
INSTALLATION INSTRUCTIONS AND PARTS LIST
TUBULAR GAS FIRED DIRECT SPARK 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 THE POINT OF
INSTALLATION. RECORD THE UNIT MODEL AND SERIAL No.(s) IN THE SPACE PROVIDED. RETAIN FOR FUTURE
REFERENCE.
Model No.
Serial No.
FORYOUR SAFETY
The use and storage of gasoline or other flammable vapors and liquids in open containers in
the vicinity of this appliance is hazardous.
FORYOUR SAFETY
If you smell gas:
1. Open windows.
2. Don't touch electrical switches.
3. Extinguish any open flame.
4.Immediately contact your gas supplier.
Improper installation, adjustment, alteration, service, or maintenance
can cause property damage, injury, or death. Read the installation, operating, and
maintenance instruction thoroughly before installing or servicing this equipment.
APPROVED FOR USE IN CALIFORNIA
Install, operate, and maintain unit in accordance with the 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'S RESPONSIBILITY
Installer Please Note: This equipment has been test fired and inspected. It has been
shipped free from defects from our factory. However, shipment and installation
problems such as loose wires, leaks, or loose fasteners may occur. It is the installer's
responsibility to inspect and correct any problem 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.
HVAC PRODUCTS
260 NORTH ELM ST., WESTFIELD, MA 01085
TEL: (413) 564-5540 FAX: (413) 562-5311
MODELS: TF-100, 125, 150, 175, 200, 250,
300, 350, 400 GF-150, 250, 400
Please utilize this toll free number to contact your local
representative 800-490-2290.
03/07
GENERAL SAFETY INFORMATION
Failure to comply with the general
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 previously listed.
safety information may result in extensive
property damage, severe personal injury, or
death.
Make certain that the power source conforms to the
electrical requirements of the heater.
This product must be installed by
a licensed plumber or gas fitter when installed
within the Commonwealth of Massachusetts.
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.
Installation must be made in accordance with local
codes, or in absence of local codes, with the latest
edition of the 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 CSA Information Services, 1-800-
463-6727. 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.
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 ground conductor between the service panel and the
heater.To ensure a proper ground, the grounding means
must be tested by a qualified electrician.
Do not insert fingers or foreign objects into 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.
If installed in Canada, the installation must conform with
local building codes, or in the absence of local building
codes, with CGA-B149.1 “Installation Codes for Natural
Gas Burning Appliances and Equipment” or CGA-B149.2
“Installation Codes for Propane Gas Burning Appliances
and Equipment.” These unit heaters have been designed
and certified to comply with CGA 2.6. Also see sections
on installation in AIRCRAFT HANGARS and PUBLIC
GARAGES.
This heater is intended for general heating applications
ONLY. It must NOT be used in potentially dangerous
locations such as flammable, 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.
Do not alter the unit heater in any
way or damage to the unit and/or severe personal
injury or death may occur!
In cases in which property damage may result from
malfunction of the heater, a back-up system or
temperature sensitive alarm should be used.
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.
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 the purging
rate, (3) elimination of all hazardous conditions. All
precautions must be taken to perform this operation
in a safe manner!
Ensure that all power sources conform
to the requirements of the unit heater, or damage to
the unit will result!
Unless otherwise specified, the following conversions
may be used for calculating SI unit measurements:
1 foot = 0.305 m
1 inch = 25.4 mm
1 gallon = 3.785 L
1 pound = 0.453 kg 1 litre/second = CFM x 0.472
1 psig = 6.894 kPa 1 meter/second = FPM ÷ 196.8
1 cubic foot = 0.028m3
Follow installation instructions CAREFULLY to avoid
creating unsafe conditions. 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 qualified individual, per instructions in this
manual. Also follow procedures listed on “Gas Equipment
Start-Up Sheet” located in this manual.
1000 BTU/cu. ft. = 37.5 MJ/m3
1000 BTU per hour = 0.293 kW
1 inch water column = 0.249 kPa
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 risk of gas leaks,
carbon monoxide poisoning, and explosion.
3
Table 1 - Performance and Dimensional Data - Tubular Propeller Unit Heater
Unit Size
100
125
150
175
200
250
300
350
400
PERFORMANCE DATA†
Input - BTU/Hr.
(kW)
Output - BTU/Hr.
(kW)
Thermal Efficiency (%)
Free Air Delivery - CFM
(cu. m/s)
Air Temperature Rise - Deg. F
(Deg. C)
100,000
(29.3)
81,000
(23.7)
81
1,600
(0.756)
47
125,000
(36.6)
101,250
(29.6)
81
2,200
(1.039)
42
150,000
(43.9)
121,500
(35.6)
81
2,400
(1.133)
47
175,000
(51.2)
141,750
(41.5)
81
2,850
(1.346)
46
200,000
(58.6)
162,000
(47.5)
81
3,200
(1.511)
47
250,000
(73.2)
202,500
(59.3)
81
3,450
(1.629)
54
300,000
(87.8)
243,000
(71.2)
81
5,000
(2.361)
45
350,000
(102.5)
283,500
(83.0)
81
5,600
(2.644)
47
400,000
(117.1)
324,000
(95.0)
81
5,800
(2.738)
51
(26)
(23)
(26)
(26)
(26)
(30)
(24)
(26)
(28)
Full Load Amps at 120V
5.3
5.8
5.8
8.0
8.0
8.0
11.3
13.5
13.5
MOTOR DATA: Motor HP (Qty.) 1/10
1/4
1/4
1/3
1/3
1/3
(2) 1/4
(0.19)
PSC
1,140
9.4
(2) 1/3
(0.25)
PSC
1,140
11.6
(2) 1/3
(0.25)
PSC
1,140
11.6
Motor kW
Motor Type
R.P.M.
(0.080)
SP
1,050
4.2
(0.19)
PSC
1,140
4.7
(0.19)
PSC
1,140
4.7
(0.25)
PSC
1,140
5.8
(0.25)
PSC
1,140
5.8
(0.25)
PSC
1,140
5.8
Amps @ 115V
DIMENSIONAL DATA - inches (mm)
“A” Overall Height to Top of Flue 33-3/4
(857)
33-3/4
(857)
20-3/4
(527)
13-3/8
(340)
11
(279)
18-5/8
(473)
18-3/4
(476)
4-3/4
(121)
24-1/2
(622)
25-1/4
(641)
5
33-3/4
(857)
20-3/4
(527)
13-3/8
(340)
11
(279)
18-5/8
(473)
18-3/4
(476)
4-3/4
(121)
24-1/2
(622)
25-1/4
(641)
5
33-3/4
(857)
32-3/4
(831)
19-3/8
(492)
11
(279)
30-5/8
(778)
30-3/4
(781)
4-3/4
(121)
24-1/2
(622)
37-1/4
(946)
5
33-3/4
(857)
32-3/4
(831)
19-3/8
(492)
11
(279)
30-5/8
(778)
30-3/4
(781)
4-3/4
(121)
24-1/2
(622)
37-1/4
(946)
5
33-3/4
(857)
32-3/4
(831)
19-3/8
(492)
11
(279)
30-5/8
(778)
30-3/4
(781)
4-3/4
(121)
24-1/2
(622)
37-1/4
(946)
5
34
(864)
50-3/4
(1289)
28-3/8
(721)
12-1/4
(311)
48-5/8
(1235)
48-3/4
(1238)
5-1/8
(130)
24-1/2
(622)
55-1/4
(1403)
6
34
(864)
50-3/4
(1289)
28-3/8
(721)
12-1/4
(311)
48-5/8
(1235)
48-3/4
(1238)
5-1/8
(130)
24-1/2
(622)
55-1/4
(1403)
6
34
(864)
50-3/4
(1289)
28-3/8
(721)
12-1/4
(311)
48-5/8
(1235)
48-3/4
(1238)
5-1/8
(130)
24-1/2
(622)
55-1/4
(1403)
6
“B” Jacket Width of Unit
20-3/4
(527)
13-3/8
(340)
11
(279)
18-5/8
(473)
18-3/4
(476)
4-3/4
(121)
24-1/2
(622)
25-1/4
(641)
5
“C” Width to CL Flue
“D” Depth to Rear of Housing
“E” Hanging Distance Width
“F” Discharge Opening Width
“G” Depth to CL Flue
“H” Discharge Opening Height
“L” Overall Unit Width
*Flue Size Diameter - in.
(Dia.-mm)
Fan Diameter - in. (Qty.)
Gas Inlet-Natural Gas (in.)
Gas Inlet- LP Gas (in.)
Approximate Unit Weight - lbs.
(127)
16
(127)
16
1/2
1/2
145
(127)
16
1/2
1/2
155
(127)
18
1/2
1/2
191
(127)
18
1/2
1/2
201
(127)
18
3/4
1/2 OR 3/4
211
(152)
(2) 16
3/4
1/2 OR 3/4
307
(152)
(2) 18
3/4
1/2 OR 3/4
321
(152)
(2) 18
3/4
1/2 OR 3/4
335
1/2
1/2
133
(kg)
(60)
173
(78)
(66)
185
(84)
(70)
195
(88)
(87)
241
(109)
(91)
251
(114)
(96)
261
(118)
(139)
367
(166)
(145)
381
(173)
(152)
395
(179)
Approximate Ship Weight - lbs.
(kg)
* For all installations, the flue collar is included with the unit and should be field installed per the instructions included with the unit.
†
Ratings shown are for unit installations at elevations between 0 and 2,000 ft (0 to 610m). For unit installations in U.S.A. above 2,000 ft. (610m), the unit input must be derated 4% for each 1,000 ft. (305m) above sea level; refer to
local codes, or in absence of local codes, refer to the latest edition of the National Fuel Gas Code, ANSI Standard Z223.1 (N.F.P.A. No. 54).
For installations in Canada, any reference to deration at altitudes in excess of 2,000 ft. (610m) are to be ignored. At altitudes of 2,000 ft. to 4,500 ft. (610 to 1372m), the unit must be derated to 90% of the normal altitude rating,
and be so marked in accordance with the ETL certification.
1-3/8"
(35)
(Hanging)
32-1/2"
(826)
E
L
D
(Hanging)
11-5/8"
(295)
(Hanging)
Flue
*
G
B
C
H
A
(Discharge
Opening)
33"
Electrical Control Panel
1" (25)
F
Gas Valve
(Discharge Opening)
Rear View
Side View
Front View
D4617
DIMENSIONS .XXX STANDARD UNITS
DIMENSIONS IN PARENTHESIS (XXX) MILLIMETERS
Figure 2 - Dimensional Drawing – Tubular Propeller Unit Heater
4
INSTALLATION
In Canada, installation must be in accordance to the
latest edition of CGA B149 “Installation Codes for Gas
Burning Appliances and Equipment.”
Do not install unit heaters in
corrosive or flammable atmospheres! Premature
failure of, or severe damage to the unit will
result!
AIR DISTRIBUTION: Direct air towards areas of
maximum heat loss. When multiple heaters are involved,
circulation of air around the perimeter is recommended
where heated air flows along exposed walls. Satisfactory
results can also be obtained where multiple heaters are
located toward the center of the area with heated air
directed toward the outside walls. Be careful to avoid all
obstacles and obstructions which could impede the warm
air distribution patterns.
Avoid locations where extreme
drafts can affect burner operation. Unit heaters
must not be installed in locations where air for
combustion would contain chlorinated, halo-
genated or acidic vapors. If located in such an
environment, premature failure of the unit will
occur!
Since 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.
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
vapor (a flue 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
floor surface. Additional unit heaters should be installed
if a minimum 50°F (10°C) thermostat setting cannot be
maintained.
NOTICE: Location of unit heaters is related directly to
the selection of sizes. Basic rules are as follows:
MOUNTING HEIGHT: Unit Heaters equipped with
standard fan guards must be installed at a minimum of
8 feet (2.4m) above the floor, measured to the bottom of
the unit. At heights above 8 feet (2.4m), less efficient air
distribution will result. If a unit is to be mounted below
8 feet (2.4m) from the floor, an OSHA approved fan
guard is required on the unit.
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
air 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
confined space. When buildings are so tight that normal
infiltration 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.
AIRCRAFT HANGARS: Unit Heaters must be installed
in aircraft hangars as follows: In aircraft hangars, unit
heaters must be at least 10 feet (3.0m) above the upper
surface of wings or engine enclosures of the highest
aircraft to be stored in the hangar, and 8 feet (2.4m)
above the floor in shops, offices and other sections of
the hangar where aircraft are not stored or housed.
Refer to current ANSI/NFPA No. 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 located at least 8 feet (2.4m) above the floor. Refer to
the latest edition of NFPA 88B, Repair Garages.
NOTICE: Unit Heater sizing should be based on heat
loss calculations where the unit heater output equals
or exceeds heat loss.
In parking structures, unit heaters must be installed so
that the burner flames are located a minimum of 18 in.
(457mm) above the floor or protected by a partition not
less than 18 in. (457mm) high. However, any unit heater
mounted in a parking structure less than 8 ft.(2.4m) above
the floor must be equipped with an OSHA approved fan
guard. Refer to the latest edition of NFPA 88A, Parking
structures.
5
INSTALLATION (continued)
CLEARANCES: Each Gas Unit Heater shall be Figure 3A
located with respect to building construction and other
equipment so as to permit access to the Unit Heater.
Clearance between vertical walls and the vertical
sides of the Unit Heater shall be no less than 6 inches
(152mm). However, to ensure access to the control box,
a minimum of 18" (457mm) is required for the control
box side. A minimum clearance of 6 inches (152mm)
must be maintained between the top of the Unit Heater
and the ceiling. The bottom of the Unit Heater must be
no less than 12 inches (305mm) from any combustible.
The distance between the flue collector and any
combustible must be no less than 6 inches (152mm).
Also see AIR FOR COMBUSTION and VENTING
sections.
NOTICE: Increasing the clearance distances may
be necessary if there is a possibility of distortion or
discoloration of adjacent materials.
Make certain that the lifting
methods used to lift the heater and the method
of suspension used in the field installation of the
heater are capable of uniformly supporting the
weight of the heater at all times. Failure to heed
this warning may result in property damage or
personal injury!
Figure 3B - Heater Mounting*
Make sure that the structure
to which the unit heater is to be mounted is
capable of safely supporting its weight. Under
no circumstances must the gas lines, the 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 the electrical conduit
for support. Failure to heed these warnings may
result in property damage, personal injury, or
death.
*All hanging hardware and wood is not included with the unit (To
be field supplied).
Figure 3C
Unit Heaters must be hung level
from side to side and from front to back, see Figure
3A, 3B and 3C. Failure to do so will result in poor
performance and/or premature failure of the unit.
Ensure that all hardware used in
the suspension of 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 3A, 3B and 3C for suspension of units.
6
GAS PIPING
To avoid 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 fire 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 gas valve to excessive pressure and
damage.
PIPE SIZING
NOTICE: If more than one unit heater is to be served
To provide adequate gas pressure to the gas unit heater, by the same piping arrangement, the total cu. ft./hr.
size the gas piping as follows:
input and length of pipe must be considered.
1. Find the cu. ft./hr. by using the following formula:
NOTICE: If the gas unit heater is to be fired with LP
gas, consult your local LP gas dealer for pipe size
information.
Input BTU/Hr.
Cu. ft./hr. =
1000
2. Refer to Table 3. Match “Length of Pipe in Feet”
with appropriate “Gas Input - Cu. Ft./Hr.” figure. This
figure can then be matched to the pipe size at the
top of the column.
NOTICE: HEATER INSTALLATION FOR USE WITH
PROPANE (BOTTLED) GAS MUST BE MADE BY
A QUALIFIED L.P. GAS DEALER OR INSTALLER.
HE/SHE 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 THE HEATER; AND
THAT IT IS PROPERLY CONNECTED TO THE
PROPANE GAS SUPPLY SYSTEM.
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. (0.29kW) natural gas
supply.
200,000 BTU/Hr
1,000 BTU/cu. ft.
= 200 Cu. ft./hr.
Using Table 3, a 1 inch pipe is needed.
Before any connection is made to the existing line
supplying other gas appliances, contact the local gas
company to make sure that the existing line is of adequate
size to handle the combined load.
NOTE: See General Safety Information section for
English/Metric unit conversion factors.
Table 3 - Gas Pipe Size
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 Specific Gravity Gas)
Nominal
Iron
Internal
Dia.
Length of Pipe, Feet (meters)
Pipe Size
in.
10
20
30
(9.1)
97
40
(12.2) (15.2) (18.3) (21.3) (24.4) (27.4) (30.5) (38.1) (45.7) (53.3) (61.0)
82 73 66 61 57 53 50 44 40 37 35
50
60
70
80
90
100
125
150
175
200
in.
0.622
(3.0)
175
(6.1)
120
1/2
(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)
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)
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)
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)
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)
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)
3/4
1
0.824
1.049
1.380
1.610
2.067
2.469
1 1/4
1 1/2
2
2 1/2
3
6300
(178)
4350
3520
3000
2650
2400
2250
2050
1950
1850
1650
1500
1370
1280
(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)
3.068 11000 7700
(311) (218)
4.026 23000 15800 12800 10900 9700
(651) (447) (362) (309) (275)
6250
(177)
5300
(150)
4750
(135)
4300
(122)
8800
(249)
3900
(110)
8100
(229)
3700
(105) (97.7) (92.0) (83.5) (75.0) (69.4) (64.6)
3450
3250
2950
2650
2450
2280
4
7500
(212)
7200
(204)
6700
(190)
6000
(170)
5500
(156)
5000
(142)
4600
(130)
1. Determine the required Cu. Ft./Hr. by dividing the input by 1000. For SI/Metric measurements: Convert BTU/Hr. to kilowatts. Multiply the units
inputs (kW) by 0.0965 to determine Cu. Meters./Hr. 2. FOR NATURAL GAS: Select 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 the General Safety section for SI Unit
measurement conversions.
7
PIPE INSTALLATION
1. Install the gas piping in accordance with applicable Figure 4 - Pipe Installation, Standard Controls
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
as specified in Table 4. A field LP tank regulator
must be used to limit the supply pressure to a
maximum of 14 in. 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 & 3 for correct gas 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 Unit Heaters, optional two-stage units are
supplied with a combination valve which includes:
a. Manual "A" valve
Never use an open flame to detect
gas leaks. Explosive conditions may exist which
may result in personal injury or death!
b. Manual "B" valve
c. Solenoid valve
d. Pressure regulator
The appliance and its individual shutoff valve must be
disconnected from the gas supply piping system during
Pipe directly into the combination valve (see Figure any pressure testing of that system in excess of 1/2 psig
4).
(3.5 kPa).
6. Gas valve has a pressure test post requiring a
3/32" hex head wrench to read gas supply and The appliance must be isolated from the gas supply
manifold pressures. Open 1/4 turn counterclockwise piping system by closing its individual manual shutoff
to read, turn clockwise to close and reseat. A 5/16" valve during any pressure testing of the gas supply
ID hose fits the pressure post.
piping system at test pressures equal to or less than
7. Provide a drip leg in the gas piping near the gas 1/2 psig (3.5 kPa).
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
shutoff valve must be located external to the jacket
(See Figure 4).
Table 4 - Gas Piping Requirements
SINGLE STAGE GAS PIPING REQUIREMENTS*
GasType
Natural Gas
Propane (LP) Gas
Manifold
Pressure
3.5 in. W.C.
(0.9 kPa)
10.0 in. W.C.
(2.5 kPa)
8. Make certain that all connections have been
adequately doped and tightened.
14.0 in. W.C. Max.
(3.5 kPa)
14.0 in. W.C. Max.
(3.5 kPa)
Supply Inlet
Pressure
Do not over tighten the inlet gas
piping into the valve. This may cause stresses that
will crack the valve!
5.0 in. W.C. Min.
(1.2 kPa)
11.0 in W.C. Min.
(2.7 kPa)
*For single stage application only at normal altitudes.
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!
8
ELECTRICAL CONNECTIONS
Figure 5a -
Low-voltage T
Thermostat Wiring
Single Stage
HAZARDOUS VOLTAGE!
DISCONNECT ALL ELECTRIC
POWER INCLUDING REMOTE
DISCONNECTS BEFORE
SERVICING. Failure to
Figure 5b -
Low-voltage
Thermostat Wiring
Two Stage
disconnect power before
servicing can cause severe
personal injury or death.
Standard units are shipped for use on 115 volt, 60 hertz,
single phase electric power. The motor name-plate and
electrical rating of the transformer should be checked
before energizing the unit heater electrical system. All
external wiring must conform to the latest edition of
ANSI/NFPA No. 70, United States National Electrical
Code, and applicable local codes; in Canada, to the
Canadian Electrical Code, Part 1, CSA Standard C22.1.
Honeywell
T834H-1009
or
T834H-1017
Thermostat
Figure 5c -
T834H-1009 or
T834H-1017
W
R
G
Thermostat Wiring
R
G
W1 W2
D6922B
Do not use any tools (i.e. screwdriver,
pliers, etc.) across terminals to check for power. Use
a voltmeter.
THERMOSTAT HEAT ANTICIPATOR ADJUSTMENTS:
The initial heat anticipator setpoint should equal the
thermostat's current amperage draw when the unit is
firing. This setpoint should be measured for the best
results. Use the recommended ranges for a guide. If
further information is needed, consult your thermostat
manufacturer's instructions.
It is recommended that the electrical power supply to
each unit heater be provided by a separate, fused, and
permanently live electrical circuit. A disconnect switch of
suitable electrical rating should be located as close to
the gas valve and controls as possible. Each unit heater
must be electrically grounded in accordance with the
latest edition of the United States National Electrical
Code, ANSI/NFPA No. 70, or CSA Standard C22.1. Refer
to Figures 5a, 5b, 5c, 5d and 5e.
Recommended heat anticipator settings:
Unit Size:
30 thru 200
250 thru 400
For Tubular Units:
0.35 Amps
0.65 Amps
THERMOSTAT WIRING AND LOCATION:
NOTICE: The start-up fan delay should not exceed
30 seconds from a cold start.
NOTICE: The thermostat must be mounted on a
vertical, vibration-free surface, free from air currents,
and in accordance with the furnished instructions.
IMPORTANT: For all wiring connections, refer to the
wiring diagram shipped with your unit (either affixed
to the side jacket or enclosed in the installation
instructions envelope). Should any original wire
supplied with the heater have to be replaced, it
must be replaced with wiring material having a
temperature rating of at least 105° C.
Mount the thermostat approximately 5 feet (1.5m) above
the floor, in an area where it will be exposed to a free
circulation of average temperature air. Always refer to
the thermostat instructions, as well as our unit wiring
diagram, and wire accordingly. Avoid mounting the
thermostat in the following locations:
1. Cold Areas - Outside walls or areas where drafts
may affect the operation of the control.
2. Hot Areas - Areas where the sun's rays, radiation,
or warm air currents may affect the operation of
the control.
Should any high limit wires have to be replaced,
they must be replaced with wiring material having a
temperature rating of 200° C minimum.
3. Dead Areas - Areas where the air cannot circulate
freely, such as behind doors or in corners.
9
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