INSTALLATION INSTRUCTIONS & PARTS LIST
SEPARATED COMBUSTION
GAS FIRED BLOWER 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.
BSCII-8
J30-05391
Model No.
Serial No.
FOR YOUR SAFETY
The use and storage of gasoline or other fl 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. Don’t touch electrical switches.
3. Extinguish any open fl 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
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.
7/12
INSTALLER'S RESPONSIBILITY
Installer Please Note: This equipment has been test fi red 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. It is the installer's
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.
260 North Elm Street - Westfield, MA 01085
Tel: (413) 568-9571 Fax: (413) 562-8437
www.mestek.com
TABLE OF CONTENTS
SPECIFICATIONS
Basic Description ....................................................2
Performance & Specifi cation Data ..........................4
GENERAL SAFETY INFORMATION
Installation Codes (throughout manual) ..............2, 3
Special Precautions ............................................ 2, 3
INSTALLATION
Locating Units ..................................................... 5, 6
Proper Clearances ..............................................5, 6
Suspension of Units ............................................5, 6
Gas Supply Piping ..............................................7, 8
Pipe Installation ..................................................... 8
ELECTRICAL CONNECTIONS ......................9, 10, 11
NOTICE: It is the equipment owner’s responsibility to provide any scaffolding or other apparatus required
to perform emergency service or annual/periodic maintenance to this equipment.
INSTALLATION - VENTING
Combustion Air Venting & Piping ..............12, 13, 14
Exhaust Venting ........................................12, 13, 14
Blower Set Up ......................................................15
OPERATION ................................................. 16, 17, 18
Adjustments ....................................................16, 18
MAINTENANCE
Servicing & Cleaning ............................................ 19
IDENTIFICATION OF PARTS .............. 4, 17, 20, 25, 26
TROUBLESHOOTING GUIDE ................ 21, 22, 23, 24
Replacement Parts ............................................... 25
WARRANTY ..............................................................27
INSPECTION SHEET ................................................ 28
SEPARATED COMBUSTION BLOWER
UNIT NUMBER DESCRIPTION ................................ 29
DESCRIPTION
The Separated Combustion Gas Blower Unit Heater is
a factory assembled, power vented, high static pressure
type centrifugal blower unit designed for heavy duty
applications, such as continuous operation, or where a
single unit heater must do the entire heating job in a
large area. Blower type unit heaters may be used with
the standard adjustable louvers, or with short duct runs
and discharge nozzles for spot heating. Blower type
unit heaters may be used where low sound levels are
required. The designs are certifi ed by ETL as providing
a minimum of 80% thermal effi ciency, and approved for
use in California. Do not alter these units in any way.
If you have any questions after reading this manual,
contact the manufacturer.
Figure 1 - Power Vented Separated Combustion Blower Unit Heaters
Front
View
The following terms are used throughout this manual, in addition to ETL 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.
See Identifi cation of Parts Section
for unit components.
Indicates an imminently hazardous situation which, if not avoided, may result in
minor injury or property damage.
Rear
View
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 certifi ed. 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 CSA-B149.1 “Installation Codes for Natural
Gas Burning Appliances and Equipment” or CSA B149.2
“Installation Codes for Propane Gas Burning Appliances
and Equipment”. These Unit Heaters have been
designed and certifi ed to comply with CSA 2.6. Also see
sections on installation in AIRCRAFT HANGARS and
PUBLIC GARAGES.
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 qualifi ed electrician.
Do not insert fi 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.
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 wiring should be done
and checked by a qualifi ed electrician, using copper wire
only. All external wiring must conform to applicable local
codes and to the latest edition of the National Electrical
Code ANSI/NFPA No. 70. All gas connections should be
made and leak-tested by a suitably qualifi ed individual,
per instructions in this manual. Also follow procedures
listed on the “Gas Equipment Start-Up Sheet” located in
this manual.
This heater is intended for general heating applications
ONLY. It must NOT be used in potentially dangerous
locations such as fl ammable, explosive, chemical-laden
or wet atmospheres.
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
confi ned 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 specifi ed, the following conversions
may be used for calculating SI unit measurements:
1 foot = 0.305 m
1 inch = 25.4 mm
1 psig = 6.894 kPa
1 pound = 0.453 kg
1 gallon = 3.785 L
1 inch water column = 0.249 kPa
meter/second = FPM ÷ 196.8
liter/second = CFM x 0.472
1000 Btu per hour = 0.293 kW
1000 Btu/Cu. Ft. = 37.5 MJ/m
1 cubic foot = 0.028 m
3
3
3
Table 1 – Performance and Specifi cation Data – Separated Combustion Blower Unit Heater
Unit Size 100 125 150 175 200 225 250 300 350 400
PERFORMANCE DATA ‡
Input BTU/Hr 100,000 125,000 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000
(kW) (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1)
Output BTU/Hr 80,000 100,000 120,000 140,000 160,000 180,000 200,000 240,000 280,000 320,000
(kW) (23.4) (29.3) (35.1) (41.0) (46.9) (52.7) (58.6) (70.3) (82.0) (93.7)
Thermal Effi ciency (%) 80 80 80 80 80 80 80 80 80 80
Free Air Delivery CFM 1,200 1,575 1,975 2,300 2,400 2,600 2,850 3,950 4,600 4,800
(cu. m/s) (0.566) (0.743) (0.932) (1.086) (1.133) (1.227) (1.345) (1.864) (2.171) (2.266)
Air Temperature Rise Deg. F. 62 59 56 56 62 64 65 56 56 62
(Deg. C) (34) (33) (31) (31) (34) (36) (36) (31) (31) (34)
Outlet Velocity FPM 880 950 1030 1045 965 935 930 1080 1090 1000
(m/s) (4.47) (4.83) (5.23) (5.31) (4.90) (4.75) (4.72) (5.49) (5.54) (5.08)
Full Load Amps at 115V 8.3 9.8 10.6 10.6 15.2 15.2 15.2 15.2 18.6 18.6
MOTOR DATA: Motor HP 1/4 1/3 1/2 1/2 3/4 3/4 3/4 3/4 1 1
Motor (kW) (0.19) (0.25) (0.37) (0.37) (0.56) (0.56) (0.56) (0.56) (0.75) (0.75)
Motor Type SPH SPH SPH SPH SPH SPH SPH SPH cap.start cap.start
R.P.M. 1725 1725 1725 1725 1725 1725 1725 1725 1725 1725
Amps @ 115V 5.1 6.6 7.4 7.4 12.0 12.0 12.0 12.0 15.4 15.4
DIMENSIONAL DATA in. (mm)
“A” Height to Top of Unit 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
(794) (794) (921) (921) (921) (921) (921) (921) (921) (921)
“B” Height to Top of Hanger 34-1/16 34-1/16 39-1/16 39-1/16 39-1/16 39-1/16 39-1/16 39-1/16 39-1/16 39-1/16
(865) (865) (992) (992) (992) (992) (992) (992) (992) (992)
“C ” Hanging Distance Width 14-3/4 17-1/2 17-1/2 20-1/4 23 25-3/4 28-1/2 34 39-1/2 45
(375) (444) (444) (514) (584) (654) (724) (864) (1003) (1143)
“D” Discharge Opening Width 15-3/8 18-1/8 18-1/8 20-7/8 23-5/8 26-3/8 29-1/8 34-5/8 40-1/8 45-5/8
“E” Width of Unit 17-7/8 20-5/8 20-5/8 23-3/8 26-1/8 28-7/8 31-5/8 37-1/8 42-5/8 48-1/8
(454) (524) (524) (594) (664) (733) (803) (943) (1083) (1222)
“F ” to Centerline of Flue 5-7/8 7-1/4 7-1/4 8-5/8 10 11-1/4 12-3/4 15-1/2 18-1/4 21
(149) (184) (184) (219) (254) (286) (324) (394) (464) (533)
“G” Hanging Distance Depth 18-1/2 18-1/2 18-1/2 20 20 23 23 23 23 23
(470) (470) (470) (508) (508) (584) (584) (584) (584) (584)
“H” Depth to Rear of Housing 42-3/4 44-3/8 44-3/8 47-3/16 47-3/16 50-7/8 48 50-7/8 50-7/8 51
(1086) (1127) (1127) (1199) (1199) (1292) (1219) (1292) (1292) (1295)
Flue Size Dia-in.** 4 4 4 4 5 5 5 6 6 6
(Dia-mm) (102) (102) (102) (102) (127) (127) (127) (152) (152) (152)
Air Inlet Size-in. 4 4 4 4 5 5 5 6 6 6
(mm) (102) (102) (102) (102) (127) (127) (127) (152) (152) (152)
Blower Size-in. 9 10 10 12 12 12 12 (2)10 (2)12 (2)12
Gas Inlet-Natural Gas-in. 1/2 1/2 1/2 1/2 1/2 3/4 3/4 3/4 3/4 3/4
Gas Inlet-LP Gas-in. 1/2 1/2 1/2 1/2 1/2 ← 1/2 or 3/4 →
Approx. Shipping Wt. lb. 298 330 362 394 426 458 490 558 618 678
(kg) (135) (150) (164) (179) (193) (208) (222) (253) (280) (308)
‡ Ratings shown are for unit installations at elevations between 0 and 2000 ft. (610m). For unit installations in USA above 2000 ft. (610m), the unit input must be derated 4% for each
1000 ft. (305m) above sea level; refer to local codes, or in absence of local codes, refer to the latest edition of the National Gas Code, ANSI Standard Z223.1 (N.F.P.A. No. 54).
For installations in Canada, any references to deration at altitudes in excess of 2000 ft. (610m) are to be ignored. At altitudes of 2000 to 4500 ft. (610m to 1372m), the unit must be
derated to 90% of the normal altitude rating, and be so marked in accordance with the ETL certifi cation.
LEGEND: SPH = SPLIT PHASE
CAP. START = CAPACITOR START
(391) (460) (460) (530) (600) (670) (740) (879) (1019) (1159)
Figure 2
DIMENSIONS .XXX STANDARD UNITS
DIMENSIONS IN PARENTHESIS (XXX) MILLIMETERS
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!
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.
NOTICE: Location of unit heaters is related directly to
the selection of sizes (refer to Figure 3). Basic rules
are as follows:
Figure 3
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 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,
offi ces 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.
In parking structures, unit heaters must be installed so
that the burner fl ames 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 feet (2.4m) above the fl oor must be equipped with an
OSHA approved fan guard. Refer to the latest edition of
NFPA 88A, Parking structures.
In Canada, installation must be in accordance to the
latest edition of CSA-B149 “Installation Codes for Gas
Burning Appliances and Equipment.”
AIR DISTRIBUTION: Direct air towards areas of
maximum heat loss. When multiple heaters are involved,
circulation of air around the perimeter is recommended
D2787
where heated air fl ows along exposed walls. Satisfactory
results can also be obtained where multiple heaters are
MOUNTING HEIGHT: Unit Heaters must be installed at
a minimum of 8 feet (2.4m) above the fl oor, measured to
the bottom of the unit. At heights above 8 feet (2.4m),
less effi cient air distribution will result. Occasionally unit
heaters must be mounted at heights of 12 to 16 feet (3.7
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. Heat throw distances are
presented in Table 2, and Figure 4.
to 4.9m) in order to clear obstacles. When this is the
case, it is advisable to use centrifugal blower unit heaters.
Table 2 - Standard Applications Heat Throw Distances (see fi gure 4)
UNIT SIZE BTU/Hr (kW)
“H”
ft. 100,000 125,000 150,000 175,000 200,000 225,000 250,000 300,000 350,000 400,000
(m) (29.3) (36.6) (43.9) (51.2) (58.6) (65.9) (73.2) (87.8) (102.5) (117.1)
8 60 65 70 75 80 85 90 105 110 120
(2.4) (18.3) (19.8) (21.3) (22.9) (24.4) (25.9) (27.4) (32.0) (33.5) (36.6)
10 54 56 60 64 68 72 78 90 95 100
(3.0) (16.5) (17.1) (18.3) (19.5) (20.7) (21.9) (23.8) (27.4) (29.0) (30.5)
12 44 46 49 57 61 65 68 80 84 90
(3.7) (13.4) (14.0) (20.7) (17.4) (18.6) (19.8) (20.7) (24.4) (25.6) (27.4)
15 NR NR 45 49 52 56 60 70 74 80
(4.6) (22.6) (14.9) (15.8) (17.1) (18.3) (21.3) (22.6) (24.4)
20 NR NR NR NR 46 50 54 63 66 70
(6.1) (14.0) (15.2) (16.5) (19.2) (20.1) (21.3)
NR = Not recommended H = Distance from fl oor to bottom of the unit.
5
INSTALLATION (continued)
Figure 4 - Heat Throw Distances
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 fl ue gases are cooled inside
the heat exchanger to a point where water vapor (a fl 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 fl oor surface.
Additional unit heaters should be installed if a minimum
50°F (10°C) thermostat setting cannot be maintained.
Make certain that the structure to
which the heater is mounted is capable of
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.
Unit heaters must be hung level
from side to side and from front to back, see
fi gures 1 through 6. Failure to do so will result
in poor performance and or premature failure of
the unit.
Insure 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.
personal injury or death!
Refer to Figures 1 through 6, and dimensional data
per table 1 for suspension of units.
Figure 5 - Heater Mounting*
NOTICE: Unit heater sizing should be based on heat
loss calculations where the unit heater output equals
or exceeds heat loss. Heater output is approximately
80% of input BTU/HR. rating.
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 inches (457mm). 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 24 inches
(610mm) from any combustible. The distance between
the fl ue collector and any combustible must be no less
than 6 inches (152mm). Also see COMBUSTION AIR
and EXHAUST 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 fi eld 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!
*All hanging hardware and wood is not included with the unit
(To be fi eld supplied).
Figure 6 - Heater Mounting 100/400 MBTU Unit Sizes
See Table 1 for “C” dimension.
6
GAS SUPPLY PIPING
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:
Input
Cu. ft/hr =
Btu per Cu. ft.
2. Refer to Table 3. Match “Pipe Run in Feet” with
appropriate “Gas Input - Cu Ft/Hr” fi gure. This fi 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
cubic feet per hour input and length of pipe must be
considered.
NOTICE: If the gas unit heater is to be fi red with LP
gas, consult the local LP gas dealer for pipe size
information.
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.
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 Specifi c Gravity Gas)
Nominal
Iron Internal Length of Pipe, Feet (meters)
Pipe Size
Dia. 10 20 30 40 50 60 70 80 90 100 125 150 175 200
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 units 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. (Cubic Meters per Hour) 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.
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 gas supply capable of supplying
its full rated capacity as specifi ed in Table 4. A fi eld
LP tank regulator must be used to limit the supply
pressure to maximum of 14 inch 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 CSA-B149.
See Tables 1, 3 and 4 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 gas pipe.
5. Optional two-stage units are supplied with a
combination valve which includes:
(a) Manual “A” valve (b) Manual “B” valve
(c) Solenoid valve (d) Pilot safety (e) Pressure
regulator
Pipe directly in to combination valve (see Figure 7).
6. A 1/8 inch 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 Figure 7.
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 liquefi ed petroleum gases regardless of
gas conducted.
Check all pipe joints for leakage
using a soap solution or other approved method.
Never use an open fl ame or severe personal
injury or death may occur.
Figure 7 - Pipe Installation, Standard Controls
D3631C
Never use an open flame to
detect gas leaks. Explosive conditions may
exist which would result in property damage,
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*
Gas Type
Manifold
Pressure
Supply Inlet
Pressure
Natural Gas
3.5 in. W.C.
(0.9 kPa)
14 in. W.C. Max.
(3.5 kPa)
5.5 in W.C. Min.
(1.4 kPa)
Propane (LP) Gas
10.5 in. W.C.
(2.6 kPa)
14 in. W.C. Max.
(3.5 kPa)
13.0 in W.C. Min.
(3.2 kPa)
*For single stage applications only, at normal altitudes.
8
ELECTRICAL CONNECTIONS
HAZARDOUS VOLTAGE!
disconnect ALL ELECTRIC
POWER INCLUDING REMOTE
DISCONNECTS BEFORE
SERVICING. Failure to
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 nameplate and
electrical rating on 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 National Electrical Code and
applicable local codes; in Canada, to the Canadian
Electrical Code, Part 1 CSA Standard C22.1.
Do not use any tools (i.e. screwdriver,
pliers, etc.) across the terminals to check for power.
Use a voltmeter.
USE COPPER CONDUCTORS ONLY!
UNIT TERMINALS ARE NOT DESIGNED TO ACCEPT
OTHER TYPES OF CONDUCTORS. Failure to do so
may cause damage to the equipment.
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 for each unit heater 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 National
Electric Code, ANSI/NFPA No. 70 or CSA Standard
C22.1. Sample wiring connections are depicted in
Figures 8, 9, & 10.
The transformer supplied with this unit heater is
internally fused. Any overload or short circuit will ruin
the transformer.
THERMOSTAT WIRING AND LOCATION
NOTICE: The thermostat must be mounted on a
vertical vibration-free surface free from air currents
and in accordance with the furnished instructions.
Mount the thermostat approximately 5 feet (1.5 m) above
the fl oor 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 control operation.
3. Dead areas - Areas where air cannot circulate freely,
such as behind doors or in corners.
* Thermostat wires tagged “W” and “G” must be
connected together except when using a general
purpose "SPDT" 24VAC relay and a standard thermostat
with subbase, or when using Honeywell T834H or T834N
thermostats. Also refer to Figure 6 for other wiring
connections.
Figure 8 - C1267G
THERMOSTAT HEAT ANTICIPATOR ADJUSTMENTS:
The initial heat anticipator setpoint should equal the
thermostat's current amperage draw when the unit is
fi ring. This setpoint should be measured for the best
results. Use the recommended ranges as a guide. If
further information is needed, consult your thermostat
manufacturer's instructions.
Recommended Heat Anticipator Setting Ranges:
25 ft. (7.6m) 50 ft. (15.2m)
Gas Ignition Type T'stat Wiring T'stat Wiring
For Power Vented Units: 0.85 to 0.90 A 0.90 to 1.1 A
Intermittent (Spark) Max. Setting
on T'stat
FAN TIME DELAY CONTROL
Leads from time delay controls are factory wired to the
junction box. The fan control is a time delay relay
(approximately 45 seconds ON, 65 seconds OFF). The
fan control is rated at 17 amps.
NOTICE: The start-up fan delay must not exceed 90
seconds from a cold start.
NOTICE: For all wiring connections, refer to the wiring
diagram that your unit is equipped with (either affi xed
to the side jacket or enclosed in your unit's
installation instruction 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.
Should any high limit switch wires have to be
replaced, they must be replaced with wiring material
having a temperature rating of 200°C minimum.
9
Figure 9
COLOR KEY
CAUTION
KEY
SEPARATED
COMBUSTION UNIT
PICTORIAL LADDER
10
Loading...