Modine Manufacturing 6-558.6 User Manual

6-558.6

P/N 5H72256A Rev. F

October, 2002

INSTALLATION AND SERVICE MANUAL

separated combustion

high efficiency

gas-fired unit heaters

models PSH & BSH

All models approved for use in California by the CEC (when
equipped with IPI), in New York by the MEA division, and in
Massachusetts. Unit heater is certified for non-residential
applications.

WARNING

Improper installation, adjustment, alteration, service or

maintenance can cause property damage, injury or death,

and could cause exposure to substances which have been

determined by various state agencies to cause cancer, birth

defects or other reproductive harm. Read the installation,

operating and maintenance instructions thoroughly before

installing or servicing this equipment.

FOR YOUR SAFETY

The use and storage of gasoline or other flammable vapors

and liquids in open containers in the vicinity of this appliance

is hazardous.

Contents

Inspection on arrival . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Performance data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Dimensional data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Checking input rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Propeller heaters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Service instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Troubleshooting guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Motor data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Control options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Rating plate identification . . . . . . . . . . . . . . . . . . . . . . . . . 27

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Back cover

Page

FOR YOUR SAFETY

If you smell gas:

1. Open windows

2. Don't touch electrical switches.

3. Extinguish any open flame.

4. Immediately call your gas supplier.

THIS MANUAL IS THE PROPERTY OF THE OWNER.
PLEASE BE SURE TO LEAVE IT WITH THE OWNER WHEN
YOU LEAVE THE JOB.

CAUTION

To prevent premature heat exchanger failure do not locate

ANY gas-fired units in areas where chlorinated, halogenated

or acid vapors are present in the atmosphere.

Inspection on Arrival

1. Inspect unit upon arrival. In case of damage, report
immediately to transportation company and your local
Modine sales representative.

2.

Check rating plate on unit to verify that power supply meets
available electric power at the point of installation.

3. Inspect unit received for conformance with description of
product ordered (including specifications where applicable).

Heater Parts from ACF Greenhouses

INSTALLATION

SPECIAL PRECAUTIONS

THE INSTALLATION AND MAINTENANCE INSTRUCTIONS
IN THIS MANUAL MUST BE FOLLOWED TO PROVIDE
SAFE, EFFICIENT AND TROUBLE-FREE OPERATION. IN
ADDITION, PARTICULAR CARE MUST BE EXERCISED
REGARDING THE SPECIAL PRECAUTIONS LISTED
BELOW. FAILURE TO PROPERLY ADDRESS THESE
CRITICAL AREAS COULD RESULT IN PROPERTY
DAMAGE OR LOSS, PERSONAL INJURY, OR DEATH.

1. Disconnect power supply before making wiring
connections to prevent electrical shock and equipment
damage. All units must be wired strictly in accordance
with wiring diagram furnished with the unit.

2. Turn off all gas before installing unit heaters.

3. Gas pressure to unit heater controls must never exceed
14" W.C. (1/2 psi).

When leak testing the gas supply piping system, the unit
and its combination gas control must be isolated during
any pressure testing in excess of 14" W.C. (1/2 psi).

The unit should be isolated from the gas supply piping
system by closing its field installed manual shut-off valve.

4. Check gas inlet pressure at unit upstream from
combination gas control. The inlet pressure should be 6" ­7" W.C. on natural gas or 11" - 14" W.C. on propane gas.
Purging of gas piping should be performed as described
in ANSI Z223.1 - Latest Edition or in Canada in
CAN/CGA-B149 codes.

5. All units must be supplied with both combustion air and
exhaust piping to the outdoors.

6. Do not install in potentially explosive or flammable
atmospheres laden with grain dust, sawdust, or similar air­borne materials. In such applications, a blower type heater
installed in a separate room with ducting, including
appropriate back flow prevention dampers to the dust­laden room, is recommended.

7. Installation of units in high humidity or salt water
atmospheres will cause accelerated corrosion resulting in
a reduction of the normal life span of the units.

d

8. To prevent premature failure
unit heaters in areas where chlorinated, halogenated or
acid vapors are present in the atmosphere.

9. Maintain separation between units so discharge from one
unit will not be directed into the inlet of another.

10. Do not install unit outdoors.

11. Minimum clearance to combustibles is 12 inches from the
bottom; 18 inches from the sides; 6 inches from the top
and vent connector.

12. Allow at least 6" clearance at the sides and 12" clearance
at rear (or 6" beyond end of fan motor at rear of unit,
whichever is greater) to provide ample air for combustion
and proper operation of fan.

13. The minimum distance from combustible material is based
on the combustible material surface not exceeding 160°F.
Clearance from the top of the unit may be required to be
greater than 6" if heat damage, or other than fire, may
occur to materials above the unit heater at the
temperature described.

14. Do not install units below 7 feet, measured from the
bottom of the unit to the floor, unless properly guarded to
provide protection from moving parts.

15. Modine units are designed for use in heating applications
with ambient temperatures between 32°F and 90°F. If an
application exists where ambient temperatures can be

o not located ANY gas-fired

expected to fall outside of the is range, contact factory
for recommendations.

16. Provide clearance for opening hinged bottom pan for
servicing. See Figure 2. Do not set unit on its bottom.

17. To assure that flames do not impinge on heat exchanger
surfaces, the unit must be suspended in a vertical and
level position. Failure to suspend unit properly may
shorten the life of the unit heater.

18. Do not life unit by power exhauster.

19. Be sure no obstructions block air intake and discharge of
unit.

20. Do not attach duct work, air filters, or polytubes to any
propeller (PSH) model unit.

21. In aircraft hangars, keep the bottom of the unit at least
10' from the highest surface of the wings or engine
enclosure of the highest aircraft housed in the hanger
and in accordance with the requirements of the enforcing
authority and/or NFPA No. 409 — Latest Edition.

22. In garages or other sections of aircraft hangars such as
offices and shops that communicate with areas used for
servicing or storage, keep the bottom of the unit at least
7' above the floor unless the unit is properly guarded to
provide user protection from moving parts. In parking
garages, the unit must be installed in accordance with
the standard for parking structures ANSI/NFPA 88A, and
in repair garages the standard for repair garages NFPA
#88B. In Canada, installation of unit heaters in airplane
hangars must be in accordance with the requirements of
the enforcing authority, and in public garages in
accordance with the current CAN/CGA-B149 codes.

23. Consult piping, electrical, and venting instructions in this
manual before final installation.

24. All literature shipped with your unit should be kept for
future use for servicing or service diagnosis. Do not
discard any literature shipped with your unit.

25. When servicing or repairing this equipment, use only
Modine-approved service replacement parts. A complete
replacement parts list may be obtained by contacting
Modine Manufacturing Company. Refer to the rating
plate on the unit for complete unit model number,
serial number and company address. Any substitution
of parts or controls not approved by Modine will be at
owners risk.

Figure 2
Hinged Bottom for Burner Service
(See Dimension “C”, page 19)

2

Heater Parts from ACF Greenhouses

INSTALLATION

Product Description

Modine PSH and BSH model unit heaters are listed as separated
combustion unit heaters and are defined as follows: A unit heater
for installation in non-residential structures which, when connected
to a sealed combustion air pipe and sealed exhaust vent, supplied
by the installer, constructed so that when installed according to the
manufacturer’s instructions, air for combustion is derived from the
outside atmosphere and the flue gases from the appliance are
discharged to the outside atmosphere and the flue gases from the
appliance are discharged to the outside atmosphere.

In the U.S., the installation of these units must comply with the
“National Fuel Gas Code,” ANSIZ223.1, latest edition (also known
as NFPA 54) and other applicable local building codes.

In Canada, the installation of these units must comply with local
plumbing or waste water codes and other applicable codes and
with the current code CAN/CGA-B149.1, “Installation Code for
Natural Gas Burning Appliances and Equipment” or CAN/CGA­B149.2, “Installation Code for Propane Burning Appliances and
Equipment.”

1. All installation and service of these units must be performed by
a qualified installation and service agency only as defined in
ANSIZ223.1, latest edition or in Canada by a licensed gas fitter.

2. This unit is certified by C.S.A., with the controls furnished. For
replacement parts, submit the complete model, control code
and serial number shown on rating plate on the unit, Modine
reserves the right to substitute other authorized controls as
replacements.

3. Unit is balanced for correct performance. Do not alter fan or
operate motors at reduced speed.

4. Information on controls is supplied separately.

5. Modine unit heaters use the same burner for natural and
propane gases.

L

ocating Unit Heaters

CAUTION

Units must not be installed in potentially explosive, flammable or
corrosive atmosphere.

To prevent premature heat exchanger failure do not locate ANY
gas-fired unit in areas where chlorinated, halogenated or acid
vapors are present in the atmosphere.

In locating units, consider general space-heating requirements,
availability of gas, and proximity to vent locations. Unit heaters
should be located so heated air streams wipe exposed walls
without blowing directly against them. In multiple unit installations,
arrange units so that each supports the sir stream from another,
setting up circulatory air movement in the area. In buildings
exposed to prevailing winds, a large portion of the heated air
should be directed along with windward wall. Avoid interference of
air streams as much as possible.

Mounting height (measured from bottom of unit) at which unit
heaters are installed is critical. Maximum mounting heights for
standard units are listed in Tables 7 and 8 on page 18. Alternate
mounting heights for units with deflector hoods or nozzles are
shown on pages 10 and 12.The maximum mounting heights for
any unit is that heights above which the unit will not deliver heated
air to the floor.The maximum mounting heights must not be
exceeded in order to assure maximum comfort.

Motors and controls used on Modine unit heaters are designed for
use in ambient temperatures between 32°F and 90°F. If an
application exists where ambient temperatures can be expected to
fall outside of this range, contact factory for recommendations.

C

ombustion Air Requirements

Modine models PSH and BSH separated combustion units are
designed to receive air for combustion directly from the outside
atmosphere via field installed combustion air piping between the
unit and the outside atmosphere.
unit must be connected to the outside atmosphere.

The maximum equivalent length of combustion air piping cannot
exceed 30 feet. Keep this limitation in mind when locating units.
See page 5 for combustion air piping instructions.

U

nit Suspension

T

he combustion air inlet of the

CAUTION

Minimum clearance to combustibles is 12 inches from the
bottom; 18 inches from the sides; 6 inches from the top and vent
connector.

Allow at least 12" at the rear of unit or 6" beyond the end of the
motor (Whichever is greater) to provide ample air for proper
operation of fan.

Provide clearance for opening hinged bottom of servicing. See
Figure 2.

Be sure the means of suspension is adequate to support the
weight of the unit. (See page 19 for unit weights.) For proper
operation, the unit must be installed in a level horizontal position.
Clearances to combustibles as specified above must be strictly
maintained.

On all propeller units except the PSH280 and PSH340, two tapped
holes (3/8 - 16) are located in the top of the unit to receive ceiling
hangers. Units with two point suspension, models PSH130 through
PSH225, incorporate a level hanging feature. Depending on what
options and accessories are being used, the heater may not hang
level as received from the factory. Do not hang heaters with
deflector hoods until referring to the "installation manual for
deflector hoods" and making the recommended preliminary
adjustments on the heater.These preliminary adjustments need to
be made with the heater resting on the floor.

PSH130 through PSH225 units without deflector hoods that do not
hang level after being installed, can be corrected in place. Simply
remove both outer side panels (screws to remove are on back
flange of side panel) and you will see the (adjustable) mounting
brackets (Figure 3). Loosen the set screws holding the mounting
brackets in place and using a rubber mallet or something similar,
tap the heater into a position where it does hang level. Re-tighten
set screws and replace the outer side panels.

The PSH280 and PSH340 have four mounting holes. On all blower
units, except the BSH280 and BSH340, two tapped holes are
provided in the top of the unit and two holes in the blower support
bracket. The BSH280 and BSH340 have four tapped holes in the
top of the unit and two in the blower support bracket for mounting.
T

o assure that flames are directed into the center of heat
exchanger tubes, unit must be supported in a vertical position, with
suspension hangers “UP.” Check with a level. This is important to
the operation and life of unit.

NOTE:

Pipe hanger adapter kits, as shown in Figure 3, are
available as accessories from Modine. The hardware allows for
pipe caps to be secured into the top of the unit heater with
machine screws (as illustrated - machine screws are 3/8 - 16 x

1.75 UNC-2A THD). The pipe caps can then accommodate 3/4"
NPT pipe for mounting. Three different kits are available with either
2, 4, or 6 adapters per kit. See price sheet to determine proper kit.

3

Heater Parts from ACF Greenhouses

INSTALLATION

Figure 2
Suspension Methods

Remove Side Panels

to Adjust Mounting Brackets

(Suspension w/ Pipe Adapter Kit)

Venting
General Venting and Combustion Air

Instructions

CAUTION

Gas-fired heating equipment must be vented — do not operated
unvented.

A built-in power exhauster is provided — additional external
draft hoods (diverters) or power exhausters are not required or
permitted.

Installation must conform with local building codes or in the
absence of local codes, with the National Fuel Gas Code, ANSI
Z223.1 (NFPA 54) — Latest Edition. In Canada installation must
be in accordance with CAN/CGA-B149.1 for natural gas
appliances, and CAN/CGA-B149.2 for propane appliances.

Table 1
ANSI venting requirements

Appliance Venting

Category Description Requirements

I

I

I

II

I

I

V

1. Table 1 summarizes the ANSI venting requirements for the
various appliance categories. All PSH/BSH models are
category III appliances. The venting requirements for a
category III appliance are included in these instructions.

2. Select the size of vent and combustion air pipe that fits the
power exhauster and combustion air intake on the rear of
the appliance (see pages 14 and 15 for dimensions). Do
not use a vent or combustion air pipe smaller than the size
of the outlet or inlet on the appliance. The pipe should be
single wall galvanized steel or other suitable corrosion
resistant material. Follow the National Fuel Gas Code for
minimum thickness of vent material. The minimum
thickness for connectors varies depending on the pipe
diameter.

3. A minimum of 12 inches straight pipe is recommended from
the power exhauster outlet before turns in the vent pipe.

Negative vent pressure Follow standard venting
Non-condensing requirements.

Negative vent pressure Condensate must be
Condensing drained.

Positive vent pressure Vent must be gastight.
Non-condensing

Positive vent pressure Vent must be liquid and
Condensing gastight.

Condensate must be
drained.

4. Install the vent and combustion air pipes with a downward
slope from the appliance of 1/4 inch per foot and suspend
securely from overhead structures at points no greater than
3 feet apart. Fasten individual lengths of vent together with
at least three corrosion resistant sheet metal screws.

5. Keep the vent pipe at least 6 inches from combustible
material. The minimum distance from combustible material
is based on the combustible material surface not exceeding
160F. Clearance from the vent pipe (or the top of the unit)
may be required to be greater than 6 inches if heat damage
other than fire (such as material distortion or discoloration)
could result.

6. Avoid venting through unheated space when possible.
When venting does pass through an unheated space,
insulate runs greater than 5 feet to minimize condensation.
Inspect for leakage prior to insulating and use insulation
that is noncombustible with a rating of not less than 350F.
Install a tee fitting at the low point of the vent system and
provide a drip let with a clean out cap as shown in figure

01. The drip leg should be cleaned annually.

7. When the vent passes through an INTERIOR wall or floor, a
metal thimble 4 inches greater than the vent diameter is
necessary. If there is 6 feet or more of vent pipe in the
open space between the unit heater and where the vent
pipe passes through the wall or floor, the thimble need only
be 2 inches greater than the diameter of the vent pipe. If a
thimble is not used, all combustible material must be cut
away to provide a 6 inches clearance. Any material used to
close the opening must be noncombustible.

8. Limit the total equivalent vent pipe length to a minimum of 5
feet and a maximum of 30 feet, making the vent system as
straight as possible. (The equivalent length of a 4 inch
elbow is 5 feet and a 6 inch elbow is 10 feet).

9. Seal the joints with a metallic tape suitable for temperatures
up to 350F. (3M tapes 433 or 363 are acceptable.) Wrap
the tape two full turns around the vent pipe.

10. Do NOT vent this appliance into a masonry chimney.

11. Do NOT use dampers or other devices in the vent or
combustion air pipes.

12. The venting system must be exclusive to a single appliance,
and to other appliance is allowed to be vented into it.

13. Long runs of horizontal or vertical combustion air pipes may
require insulation in very cold climates to prevent the
buildup of condensation on the outside of the pipe where
the pipe passes through conditioned spaces.

14. Vertical combustion air pipes should be fitted with a tee with
a drip leg and a clean out cap to prevent against the
possibility of any moister in the combustion air pipe from
entering the unit. The drip leg should be inspected and
cleaned periodically during the heating season.

15. When condensation may be a problem, the vent system
shall not terminate over public walkways or over an area
where condensate or vapor could create a nuisance or
hazard or could be detrimental to the operation of regulator,
relief openings or other equipment.

16. Precautions must be taken to prevent degradation of
building materials by flue products.

17. The vent cap for vertically vented appliances should extend
above any portion of a building within a horizontal distance
of 2 feet. Refer to figures 7 and 8.

4

Heater Parts from ACF Greenhouses

INSTALLATION

Venting Instructions for Concentric Vent
Options

The concentric vent concept allows for the vent pipe and the
combustion air pipe to pass through one hole in an
EXTERIOR wall or roof. The concentric vent kits offered are
horizontal or vertical. Venting with 2 pipes; a combustion air
pipe and flue product vent pipe remains an option, primarily
for replacement heaters where two holes through the exterior
of a building already exist.

When utilizing the concentric vent option, you have already
pre-determined whether the unit heater will be horizontal vent
or vertical vent and have received the appropriate kit. At this
time, you need to verify that you have all the components
required for the venting option chosen. The components for
each kit are as follows:

Horizontal Concentric Vent Kit:

• concentric adapter assembly

• specially designed vent termination cap

• specially designed inlet air guard

Vertical Concentric Vent Kit:

• concentric adapter assembly

• standard Briedert Type L or Gary Steel 1092 vent
termination cap

• specially designed inlet terminal

Although the first installation you will make will be the
concentric adapter assembly, you should now
the instructions for the type of venting option you’ve already
chosen - i.e. horizontal concentric, vertical concentric, 2 pipe
horizontal or 2 pipe vertical. These instructions can be found
on pages 5, 6,or 7 of these installation instructions. After
reading your specific instructions, come back to “Installing the
Concentric Vent Adapter Box” section and begin.

“

read ahead”

F

igure 3

Adapter Box Assembly with Typical Field Supplied Mounting
Brackets

C

A

4. Determine the appropriate length of vent pipe that must be
attached to the vent outlet (the concentric side) of the box.
Refer to the following sections for the minimum length of
vent pipe to be used for the method of venting (vertical or
horizontal). Make sure to add the length of the field
supplied brackets if used, and the thickness of the wall or
roof.

5. Cut the vent pipe to the proper length and attach it to the
vent outlet of the concentric vent adapter box using at
least 3 corrosion resistant sheet metal screws. Seal this
joint using metallic tape suitable for temperatures up to
350° F. Wrap the tape two full turns around the vent pipe.
See figure 4.

F

igure 4

Adapter Box Assembly with Vent Outlet Pipe Attached

B

I

nstalling the Concentric Vent Adapter Box

CAUTION

The concentric vent adapter box must be installed inside of
the structure or building. Do not install this box on the
exterior of a building or structure.

1. Determine the location of the box. Refer to the instructions
in the following sections for the method of venting to be
used (vertical or horizontal). Maintain all clearances as
listed in these instructions.

2. This box can be mounted flush to the wall or roof, or the
box can be offset from the wall or roof by using field
supplied brackets. When mounting the box, consider
serviceability and access to the vent and combustion air
pipes.

3. If the box is to be mounted using field supplied brackets,
these brackets must be strong enough to rigidly secure
the box to the wall or roof, and should be made from
corrosion resistant material. After determining the length
of the field supplied brackets, attach them to the sides of
the box using several corrosion resistant sheet metal
screws. See figure 3 for typical installation and brackets.

Adapter Box Dimensions

Concentric Side

Exhaust Combustion

Heater Sizes

130-225 8

Heater Sizes

280-340

A B C

1

/4" 113/4" 4" 4" 6"

101/2" 16" 4" 6" 8"

6. Determine the length of the combustion air pipe to extend
through the wall. Refer to the following sections for the
minimum length of combustion air pipe to be used for the
method of venting being used, vertical or horizontal. Cut
the pipe to the proper length.

7. Slide the combustion air pipe over the vent pipe. Attach
the combustion air pipe to the adapter box using at least 3
non corrosive sheet metal screws. See figure 5.

F

igure 5

Adapter Box Assembly with Combustion Air
Pipe Attached

5

Heater Parts from ACF Greenhouses

INSTALLATION

T

8. Place this assembly (the adapter box, vent pipe and
combustion air pipe) through the wall or roof and verify that
the distance requirements as defined in the following
sections are met. Securely attach the assembly (adapter
box and vent and combustion air pipe) to the wall or roof
using appropriate fasteners.

H

orizontal Concentric Venting:

Figure 6
Horizontal Concentric Vent

(rear pipe hidden)

1"

To Exhaust

1. The vent must terminate with a Gary Steel Model 1092 or
Briedert Type L cap for the appropriate pipe size.

2. The combustion air pipe must terminate with the cap
supplied by the manufacturer. This cap is specially
designed to work with the concentric vent system. Refer to
the parts list on page 5 for the appropriate part.

3. The bottom of the air intake pipe must terminate above the
snow line, or at least 12 inches above the roof, which ever
distance is greater.

4. The bottom of the vent cap must terminate at least 6 inches
above the top of the air intake cap.

5. To attach the caps, slide the combustion air cap over the
vent pipe and fasten it to the combustion air pipe with at
least 3 non corrosive fasteners. Then, attach the vent cap
to the vent pipe, also using at least 3 non corrosive
fasteners.

6. Caulk the gap between the combustion air cap and the vent
pipe with silicone sealant, or other appropriate sealants
suitable for metal to metal contact and for temperatures of
350° F.

12"

o Combustion

Air Inlet

1. The vent pipe must terminate with the terminal supplied by
the manufacture for horizontal venting. Refer to the parts
list on page 5 for the appropriate part.

2. The combustion air pipe must terminate at least 1 inch from
the wall. This will prevent water from running down the wall
and into the pipe and allows for easy installation of the
combustion air intake guard.

3. Caulk between the wall and the air intake pipe.

4. Maintain 12 inches from the combustion air inlet to the back
of the vent terminal.

5. Attach the combustion air intake guard using non corrosive
screws as shown in figure 5. This guard must be placed at
the end of the pipe on the exterior of the building. This
guard helps to prevent animals and debris from entering the
combustion air pipe.

V

ertical Concentric Venting:

Figure 7
Vertical Concentric Vent

(back view typical)

wo Pipe Venting

T

Two pipe venting refers to using two penetrations through an
exterior wall or roof. This method of venting is primarily used
for replacement heaters where two holes through the exterior of
a building exist. To vent using this method, either (2) Briedert
Type L caps or (2) Gary Steel Model 1092 caps provided with
your unit heater must be used. These caps are used for both
vertical and horizontal venting of the heater.

V

ertical Two Pipe Venting

Figure 8
Vertical Venting - Two Pipes

1. The bottom of the combustion air cap must be located
above the snow line or 12 inches above the roof, which ever
is greater.

2. The vent must terminate at least 1 foot above and 16
inches horizontally from the combustion air inlet.

3. When the vent passes through a combustible roof, a metal
thimble 4 inches greater than the vent diameter is
necessary. If there is 6 feet or more of vertical vent pipe in
the open space between the unit heater and where the vent
pipe passes through the roof, the thimble need only be 2
inches greater than the diameter of the vent pipe. If a
thimble is not used, all combustible material must be cut
away to provide a 6 inch clearance. Any material used to
close the opening must be noncombustible.

6

Heater Parts from ACF Greenhouses

INSTALLATION

Horizontal Two Pipe Venting

Figure 9
Horizontal Venting - Two Pipes

1. When horizontal vents pass through a combustible wall (up
to 8 inches thick), the vent passage must be constructed
and insulated as shown in Figure 10.

2. The termination of horizontally vented system must extend
12 inches beyond the exterior surface of an exterior wall.

3. The combustion air pipe must be a minimum of 16 inches
below the vent pipe, and 24 inches from the exterior wall.

4. Support the vent and combustion air pipe as shown in
Figure 10.

Figure 10
Exhaust Vent Construction Through Combustible Walls
and Support Bracket

PLATE

45

FIBER GLASS

INSULATION

MIN. 2"

1"

9"

9"

VENT TERMINATION
SUPPORT BRACKET

(where required)

(Make from 1" x 1" steel angle)

VENT PIPE
DIAMETER

iping

P

2" MIN.

2" MIN.

METAL

SLEEVE

METAL

SLEEVE

METAL FACE

1"

CAUTION

Gas pressure to unit heater controls must never exceed 14"
W.C. (1/2 psi).

When leak testing the gas supply piping system, the appliance
and its combination gas control must be isolated during any
pressure testing in excess of 14" W.C. (1/2 psi).

The appliance should be isolated from the gas supply piping
system by closing its field installed manual shut-off valve.

1. Installation of piping must be in accordance with local
codes, and ANSI Z223.1, “National Fuel Gas Code,” or
CAN/CGA-B149 in Canada.

2. Piping to units should conform with local and national
requirements for type and volume and gas handled, and
pressure drop allowed in the line. Refer to Table 5, to
determine the cubic feet per hour (cfh) for the type of gas

Table 2
Gas Pipe Capacities

In Cu. Ft. per Hour with Pressure Drop of 0.3 in W.C. with Specific Gravity 0.60.

Length Diameter of Pipe — Inches
of Pipe

in Ft. 1/2 3/4 1 1-1/4 1-1/2

15 76 218 440 750 1220
30 73 152 285 590 890
45 44 124 260 435 700
60 50 105 190 400 610
75 97 200 345 545

90 88 160 320 490
105 80 168 285 450
120 158 270 420
150 120 242 380
180 128 225 350

210 205 320
240 190 300
270 178 285
300 170 270
450 140 226
600 119 192

ength Diameter of Pipe — Inches

L
of Pipe

in Ft. 2 3 4 6 8

15 2480 6500 12880 38700 79000

30 1650 4700 9700 27370 55850

45 1475 3900 7900 23350 45600

60 1150 3250 6800 19330 39500

75 1120 3000 6000 17310 35300

90 930 2600 5400 15800 32250
105 920 2450 5100 14620 29650
120 860 2300 4800 15680 27920
150 710 2000 4100 12240 25000
180 720 1950 4000 11160 22800

210 660 1780 3700 10330 21100
240 620 1680 3490 9600 19740
270 580 1580 3250 9000 18610
300 545 1490 3000 8500 17660
450 450 1230 2500 7000 14420
600 380 1030 2130 6000 12480

and size of unit to be installed. Using this cfh value and the

length of pipe necessary, determine the pipe diameter from

Table 2. Where several units are served by the same main,

the total capacity, cfh, and length of main must be

considered. Avoid pipe sizes smaller than 1/2". Table 2

allows for the usual number of fittings with a 0.3; W.C.

pressure drop. Where the gas supplied has a specific

gravity other than 0.60, apply the multiplying factor as given

in Table 3.

3. After threading and reaming the ends, inspect piping and
remove loose dirt and chips.

4. Support piping so that no strains are imposed on unit or
controls.

5. Use two wrenches when connecting piping to unit controls.

Table 3
Specific Gravity Conversion Factors

Multiplying factors to be used with Table 1 when the specific gravity of gas is
other than 0.60.

Natural Gas Propane Gas

Specific Specific

Gravity Factor Gravity Factor

0.55 1.04 1.50 0.633

0.60 1.00 1.53 0.626

0.65 0.962 1.60 0.612

Heater Parts from ACF Greenhouses

7

INSTALLATION

6. Provide a drip pocket before each unit and in the line where
low spots cannot be avoided. (See Figure 7).

7. Take-off to unit should come fro top or side of main to avoid
trapping condensate.

8. Piping, subject to wide temperature variations, should be
insulated.

9. Pitch piping up toward unit at least 1/4" per 15' of horizontal
run.

10. Compounds used on threaded joints of gas piping must be
resistant to action of liquefied petroleum gases.

11. Purge air before lighting unit by disconnecting pilot tubing at
combination gas control.
into heat exchanger.

12. After installation, check system for gas leaks, using a soap
solution.

13. Install a ground joint union and a manual shut off valve
immediately upstream of the unit including a 1/8" NPT
plugged tapping accessible for test gage connection. (See
Figure 7).

14. Allow at least 5 feet of piping between any high pressure
regulator and unit control string.

15. When Pressure/Leak testing, pressures above 14'' W.C. (1/2
psi), close the field installed shut-off valve, disconnect the
appliance and its combination gas control from the gas
supply line, and plug the supply line before testing. When
testing pressures 14" W.C. (1/2 psi) or below, close the
manual shut-off valve on the appliance before testing.

Figure 7
Recommended Piping to Controls

GAS

SUPPLY LINE

GAS

SUPPLY LINE

3"

MIN.

I

n no case should line be purged

A manual shut off valve with
1/8' N.P.T. plugged tapping,
accessible for test gage

GROUND

JOINT

UNION

PLUGGED

1/8" NPT TEST

GAGE CONNECTION

connection must be installed
immediately upstream of the
gas supply connection to the
appliance.

TO

CONTROLS

The power to these units should be protected with a fused
disconnect. Units for use with three-phase electric power must
be provided with a motor starter having properly sized overload
protection.

Location of thermostat should be determined by heating
requirements and be mounted on an inside wall about 5' above
floor level . . . where it will not be affected by heat from the unit
or other sources, or drafts from frequently opened doors. See
instructions packed with thermostat.

I

nstallation of Blower Models (BSH Units)

CAUTION

Proper air flow and distribution, across the hat exchanger must
be provided to prevent early failure of the blower unit heater.

Attachment of Field Installed Ductwork,
Blower BSH Models Only

Burned-out heat exchanger and shorter equipment life will
result from not providing uniform air distribution.

CAUTION

Do not attempt to attach ductwork of any kind to propeller PSH
models.

When installing unit, always follow good duct design practices
for even distribution of the air across the heat exchanger.
Recommended layouts are shown below. When installing blower
units with ductwork, the following must be done.

P

rovide uniform air distribution over the heat exchanger.

1.
Use turning vanes where required. See figures below.

2. Provide removable access panels in the ductwork on the
downstream side of the unit. These openings should be
large enough to view smoke or reflect light inside the casing
to indicate leaks in the heat exchanger and to check for hot
spots on exchanger due to poor air distribution or lack of
sufficient air (cfm).

3. If ductwork is connected to the rear of the unit, use Modine
blower enclosure kit, or if using field designed enclosure,
maintain dimensions of proper blower enclosure as shown.
on page 19.

DRIP

POCKET

iring General

W

CAUTION

Disconnect power supply before making wiring connections to
prevent electrical shock and equipment damage. ALL UNITS
MUST BE WIRED STRICTLY IN ACCORDANCE WITH
WIRING DIAGRAM FURNISHED WITH UNIT.

ANY WIRING DIFFERENT FROM WIRING DIAGRAM MAY BE
HAZARDOUS TO PERSONS AND PROPERTY.

Any damage to or failure of Modine units caused by incorrect
wiring of the units is not covered by MODINE’S STANDARD
WARRANTY (see Back Cover).

All field installed wiring must be done in accordance with the
National Electrical Code ANSI/NFPA 70 — Latest Edition or
Canadian Electrical Code CSA C22.1 Part 1 or local codes.
Unit must be electrically grounded according to these codes.
See wiring diagram shipped with unit. For optional wiring
diagrams see Bulletin 6-453.

8

CAUTION

Check for red heat exchanger tubes. If bottom of tubes become
red while blower unit is in operation, check for proper air volume
and air distribution. Adjust blower speed or correct discharge
duct design to correct problem.

nstallation of Blower Units (BSH)

I

Determining Blower Speed

The drive assembly and fan motor on all gas-fired blower units
are factory assembled. The adjustable motor sheave has been
pre-set to obtain maximum air flow without any external static
pressure. The motor sheave should be adjusted as required
when the unit is to be operated at other air flows and/or with
external static pressures. Adjustment must always be within the
performance range shown on pages 14 and 15 and the
temperature rise range shown on the unit’s rating plate.

To determine the proper blower speed and motor shave turns
open, the conditions under which the unit is to operate must be
know. If the blower unit is to be used without duct work, nozzles
or filters, the only criteria for determining the motor sheave
turns open and blower speed is the amount of air flow to be
delivered. The performance tables for blower models are shown
on pages 14 and 15. As an example, a model BSH150 unit

Heater Parts from ACF Greenhouses

INSTALLATION

A

3" MIN.

12"

MIN.

3" MAX.

TURNING

VANES

12"

B

BAFFLE

12"

MIN.

A

B

BAFFLE

TURNING

VANES

12" MIN.

B

3" MAX.

TURNING

VANES
3" MIN.

A

Recommended Installations

A B C

SIDE VIEW SIDE VIEW TOP VIEW

D E F

B

without filters operating with one external static pressure, that
is, no duct work, nozzles, etc., and is to deliver an air flow of
2071 cfm (cfm = cubic feet of air) requires that the unit be
supplied with a 1/2 hp motor, a C25 drive and, the motor
sheave set at 5 turns open to achieve a blower speed of 255
rpm (see performance table for units
page 14). See “Blower Adjustments” for setting of motor sheave
turns open.

If a blower unit is to be used with ductwork or nozzles, etc., the
total external static pressure under which the unit is to operate,
and the required air flow must be known before the unit can be
properly adjusted. Any device added externally to the unit, and
which the air must pass through, causes a resistance to air
flow. This resistance is called pressure loss. The total of the
pressure losses must be determined before adjusting the
blower speed.

If Modine filters are used, the expected pressure loss through
the filters is included in performance data on page 15. If Modine
supplied discharge nozzles are used, the expected pressure
loss of the nozzles can be found footnoted at the bottom of
page 10. If filters, nozzles, or ductwork are to be used with the
unit, and they are not supplied by Modine, the design engineer
or installing contractor must determine the pressure loss for the
externally added devices, or ductwork, to arrive at the total
external static pressure under which the unit is to operate.

Once the total external static pressure and the required air flow
are known, the operating speed of the blower can be
determined and the correct motor sheave adjustments made.
As an example, let’s say a model BSH150 is to be used with a
Modine supplied blower enclosure, Modine supplied filters, are
to be attached to ductwork supplied by others, and the unit is to
move 2071 cfm of air flow against an external static pressure of

0.2" W.C. static pressure, it is seen that the unit will require a
1/2 hp motor using a C22 drive, and the motor sheave should
be set at 1 turn open to achieve a blower speed of 415 rpm.
See “Blower Adjustments” for setting of motor sheave turns
open.

T

o Install (Figure 8):

1. Remove and discard the tie down strap and the shipping
block beneath the belt tension adjusting screw. (Not used
on all models.)

2. Adjust belt tension adjusting screw for a belt deflection of
approximately 3/4" with five pounds of force applied midway

A

BAFFLE

SIDE VIEW SIDE VIEW TOP VIEW

without

blower enclosure,

Dimension “B” Should Never
Be Less than 1/2 of “A”

12"

B

MIN.

A

12"

MIN.

TURNING

VANES

between the sheaves (refer to Figure 9a). Since the belt
tension will decrease dramatically after an initial run-in
period, It is necessary to periodically re-check the tension.
excessive tension will cause bearing wear and noise.

3. The blower bearings are lubricated for life; however, before
initial unit operation the blower shaft should be lubricated at
the bearings with SAE20 oil. This will reduce initial friction
and start the plastic lubricant flowing.

4. Make electrical connections according to the wiring
diagram.

5. Check rotation of the blower. Motor should be in clockwise
rotation when facing motor pulley. If rotation is incorrect,
correction should be made by interchanging wiring within
the motor. See wiring diagram on the motor.

6. The actual current draw of the motor should be determined.
Under no condition should the current draw exceed that
shown on the motor rating plate.

Figure 8
Blower Model Installation

Threaded Rod
Mounting Brackets on
Blower Assembly

Motor Mounting
Bracket

Motor Sheave
(Movable Face
to Outside)

Blower
Sheave

Combustion Air Inlet

I

t is the installer’s responsibility to adjust the motor sheave to

7.

Blower Housing

Motor
Adjustment
Screw

provide the specified blower performance as listed on pages
14 and 15, for blower settings different

Heater Parts from ACF Greenhouses

9