COOK HMD User Manual
1
Heated Makeup Direct: A Direct Fire Make-Up Air Unit
®
This installation manual provides information for
installing and conguring the Loren Cook Company HMD.
Models: HMD-2400, HMD-3400, HMD-4100.
For information and instructions on special equipment,
contact Loren Cook Company.
For additional safety information, refer to AMCA
publication 410-96, Safety Practices for Users and
Installers of Industrial and Commercial Fans. This
document and all Cook publications may be obtained from
Cook by phoning (417) 869-6474, extension 166; by FAX
at (417) 832-9431; or by e-mail at info@LorenCook.com.
All Cook publications are available on LorenCook.com.
Installation, Operation, And Maintenance Manual
Receiving and Inspection
Carefully inspect the unit and accessories for any
damage and shortage immediately upon receipt of the unit.
• Turn the blower by hand to ensure it turns freely and
does not bind.
• Record on the Delivery Receipt any visible sign of
damage.
HMD
Lifting
holes
Handling
Lift unit fans by the lifting holes or by the shipping
container. Never lift by the housing.
Storage
If the fan is stored for any length of time prior to
installation, store it in its original shipping crate and protect
it from dust, debris and the weather.
Rotate the wheel several revolutions every three to ve
days to keep a coating of grease on all internal bearing
parts.
WARNING: 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.
FOR YOUR SAFETY
If you smell gas:
1. Open windows.
2. Don’t touch electrical switches.
3. Extinguish any open ame.
4. Immediately call your gas supplier.
FOR YOUR SAFETY
The use and storage of gasoline or other
ammable vapors and liquids in open
containers in the vicinity of this appliance is
hazardous.
Fire Or Explosion Hazard
Installation and service must be performed
by a qualied installer, service agency or
gas supplier.
Intake Air
If HMD unit is used for make-up air for any
type of fuel burning equipment, HMD unit
must NOT be primary source of intake air.
Consult fuel burning equipment manufacture
for requirements and recommendations.
Environmental Hazards
Other considerations may be required if high
winds or seismic activity are present. If more
information is needed, contact a licensed
professional engineer before moving
forward.
Improper installation, adjustment, alteration,
service or maintenance can cause serious
injury, death or property damage. Carefully
read this publication and any supplemental
documents prior to any installation or
maintenance procedure.
2
Installation
Rotating Parts & Electrical Shock Hazard
Improper installation and handling can
result in electric shock, possible injury due
to coming in contact with moving parts, as
well as other potential hazards.
Disconnect electric power before working
on unit.
Follow proper lockout / tagout procedures to
ensure the unit cannot be energized while
being installed or serviced.
A disconnect switch should be placed
near the fan in order that the power can
be swiftly cut off, in case of an emergency
and in order that maintenance personnel
are provided complete control of the power
source.
Verify that the power source is compatible
with the equipment. Grounding for the motor
is required. All eld-installed wiring must
be completed by qualied personnel. All
eld installed wiring must comply with local
electrical and safety codes, National Electric
Code(NEC), the National Fire Protection
Agency (NFPA 70), and Canadian Electric
Code (CEC) – when in Canada.
Clearance to Combustible / Service Clearances
The minimum distance required between the heater and
adjacent combustible surfaces is 42 inches (1066.8 mm),
on the controls side of the unit, to ensure the adjacent
surface’s temperature does not exceed 90 degrees above
the ambient temperature.
For specic dimensions, refer to the submittal drawing
for the specic fan type.
Installation of the heater (1) in airplane
hangars must be done in accordance with
the Standard for Aircraft Hangars, ANSI/NFPA
409, and (2) public garages must be done in
accordance with the Standard for Parking
Structures, ANSI/NFPA 88A, or the Standard
for Repair Garages, ANSI/NFPA 88B, and with
CAN/CSA B149.1 Natural Cas and Propane
Installation Codes.
NOTICE! Adequate building relief shall be provided
so as to not over pressurize the building when the
heating system is operating at its rated capacity. It
should be noted that this can be accomplished by
taking into account, through standard engineering
methods, the structure’s designed inltration rate;
by providing properly sized relief openings; or by
interlocking a powered exhaust system; or by a
combination of these methods.
NOTICE! All indoor and outdoor units require
that the air to the heater is ducted directly from
the outdoors. Recirculation of room air is not
permitted.
NOTICE! The heater inlet shall be located in
accordance with the applicable building code
provisions for ventilation air.
Do not allow the power cable to kink
or come in contact with oil, grease, hot
surfaces, or chemicals. Replace cord
immediately if damaged.
Never open blower access doors while the
fan is running.
Failure to follow these instructions could
result in death, serious injury or property
damage.
NOTICE! Field constructed intake accessories
should be properly designed to minimize the entry
of snow and rain.
NOTICE! If in doubt regarding the application, consult
the heater manufacturer.
Indoor Hanging Arrangement
1. Install threaded hangers from ceiling supports.
When locating hangers, allow enough room to open
access panel(s). Two nuts must be used on the end
Hanging Mount Example
Hangers
Wiring Entry
Unit
Duct
Sealant
Supports
3
of each threaded hanger. Ceiling supports are not
supplied.
2. Using sheet metal screws, attach the weatherhood/
thru-wall / lter section to the damper / burner
section. The ange on the weatherhood / thru-wall
/ lter section should overlap the ange on the
damper / burner section.
3. Raise the unit into place
4. Using two nuts per hanger, fasten the unit supports
to the hangers under the unit. Appropriate unit
supports, such as the optional hanging bracket kit
or c-channel and angle iron (not included) should be
used.
5. Attach ductwork to unit using self-tapping screws
NOTICE! In order to prevent the unit from swinging
and to provide a safe environment for service and
maintenance, additional measures may be needed to
secure the unit.
Good duct practices should be followed for
all ductwork. Ductwork should be installed
in accordance with SMACNA and AMCA
guidelines, NFPA 96 and any local codes.
NOTICE! When a duct work system is attached to
the inlet of the heater purge the volume of the duct
system with at least four air changes prior to an
ignition attempt.
6. Apply sealant around the perimeter of the
weatherhood to prevent water penetration and drafts
into the building.
Curb Arrangement
1. Position curb on the roof. Verify that unit supports
are level, shim if necessary.
2. Attach curb to roof, ash in place
3. Attach ductwork to unit using self-tapping screws
Good duct practices should be followed for
all ductwork. Ductwork should be installed
in accordance with SMACNA and AMCA
guidelines, NFPA 96 and any local codes.
4. Apply an appropriate sealant around the perimeter
of the curb and duct adapter(s) to isolate fan
vibration and prevent water penetration
5. Use the 4 lifting lugs to lift and place unit on the
curb. A crane with a spreader bars is required.
6. NOTICE! Do not include a wood nailer. Use self-
tapping sheet metal screws to fasten the unit to the
curb support.
7. The weatherhood can now be assembled and
Curb Mount Example
attached to the unit.
8. Using an appropriate sealant, seal the seam
between the weatherhood and the unit.
Wiring
All wiring should be done in accordance with
the latest edition of the National Electric Code
ANSI / NFPA 70 and any local codes that may
apply. In Canada, wiring should be done in
accordance with the Canadian Electrical Code.
NOTICE! The equipment must be properly
grounded. Any wiring running through the unit in
the airstream must be protected by metal conduit,
metal clad cable or raceways.
NOTICE! If any of the original wire as supplied with
the heater must be replaced, it must be replaced
with type TW1 600v wire or its equivalent.
NOTICE! Field-wiring having a temperature rating
of at least 105ºC shall be used and supply circuit
wiring shall have a minimum size of 14 AWG.
NOTICE! High voltage electrical input is needed for
this equipment.
An electric disconnect switch having adequate
ampacity (see marking on the heater for
voltage and ampacity), if not provided as part
of the heater, shall be installed in accordance
with Article 430 of the National Electrical Code,
ANSI/NFPA 70.
1. The unit’s nameplate states the voltage and the
unit’s MCA. The main power lines to the unit should
be sized accordingly. The nameplate is located on
the outside of the unit on the control panel side.
2. Install eld electrical wires through the provided
Custom work
Any wiring deviations may result in personal
injury or property damage. Manufacturer
is not responsible for any damage to, or
failure of the unit caused by incorrect nal
wiring.
Manufacturer’s standard control voltage is
120 VAC. Control wire resistance should not
exceed 0.75 ohms (approximately 285 feet
total length for 14 gauge wire; 455 feet total
length for 12 gauge wire). If the resistance
exceeds 0.75 ohms, an industrial-style
plug-in relay should be wired in place of
the remote switch. The relay must be rated
for at least 5 amps and have a 120 VAC
coil. Failure to comply with these guidelines
may cause motor starters to chatter or not
pull in, resulting in contactor failures and/or
motor failures.
4
holes.
Ground A
3 Phase, 9 Lead Motor
3 Phase, 9 Lead Motor
3. Connect the main power lines to the disconnect
switch and main grounding lug(s). Torque eld
connections to 20 in.-lbs.
4. Wire the optional convenience outlet. The
convenience outlet requires a separate 115V power
supply circuit. The circuit must include short circuit
protection which may need to be supplied by others.
Single Phase
When ground is required, attach
to ground A or B with no. 6
thread forming screw. To reverse,
T-1
T-4
interchange T-1 and T-4
Ground B
Three Phase
A complete wiring diagram is attached on
the inside of the control center door(s). It is
also available in the HMD Wiring Diagram
Supplement.
Y-Connection
Low Voltage
208/230 Volts
4
5
6
1
728
3
9
L2L
L
3
1
High Voltage
460 Volts
456
789
12
L2L
L
1
Delta-Connection
Low Voltage
208/230 Volts
7
6
1
3
L
1
3
High Voltage
9
8
5
4
3
2
L
L
3
2
12
Gas
All gas piping must be installed in accordance
with local codes, or in the absence of local
codes, in accordance with the National Fuel
Gas Code, ANSI 2223.1/NFPA 54, or the
CAN/CSA B149.1 Natural Cas and Propane
Installation Code.
Do not connect the unit to gas types other than
what is specied and do not connect the unit to gas
pressures that are outside of the pressure range
shown on the label.
When connecting the gas supply, the length
of the run must be considered in determining
the pipe size to avoid excessive pressure drop.
Refer to a Gas Engineer’s Handbook for gas
pipe capacities.
Refer to the heater rating plate for determining
the minimum gas supply pressure for obtaining
the maximum gas capacity for which this heater
is specied.
1. Determine the supply gas requirements by looking
at the unit’s nameplate on the outside of the unit on
the control center side.
2. When the supply gas pressure exceeds the maximum
gas pressure shown on the nameplate, an additional
regulator (by others) is required to reduce the
pressure. The regulator must have a listed leak
limiting device or it must be vented to the outdoors.
The regulator located inside the unit is used to adjust
the unit’s maximum output temperature.
460 Volts
789
456
3
L
L
1
2
3. If an optional vent line is located between the safety
shutoff valves it must be piped to the outdoors.
Reference the National Fuel Gas Code for
additional vent line requirements.
4. Test the system for leaks.
Operation
L
1
Line
L
2
Follow the pre start-up list before
proceeding. Follow the procedure in the
exact order that it is presented.
Failure to do so could result in serious injury
or death and damage to equipment.
Pre Start-Up:
General
1. Get: voltage & amperage meter, thermometer, micro
amp meter, u-tube manometer & tachometer.
2. Perform a gas leak check during heater start-up, to
verify the gas tightness of the heater’s components
L
3
and piping under normal operating conditions.
3. Disconnect and lock-out all power and gas.
Blower
1. Check the housing, blower, and ductwork for any
foreign objects before running the blower.
2. Rotate the fan wheel by hand and make sure no
parts are rubbing. Check the V-belt drive for proper
alignment and tension (a guide for proper belt tension
and alignment is provided in the Belt Maintenance
section).
3. Check fasteners, set screws and locking collars on
the fan, bearings, drive, motor base, and accessories
for tightness.
4. Compare the supplied voltage, hertz, and phase with
the unit and motor’s nameplate information.
5. Open the blower access door and run
the blower momentarily to determine
the rotation. Arrows are placed on the
blower scroll to indicate the proper
direction.
NOTICE! If the blower is rotating in
the wrong direction, the unit will move
some air, but will not perform as designed. Be sure
to perform a visual inspection to guarantee the
correct blower rotation.
• To reverse the rotation on three phase units,
disconnect and lock-out the power, then interchange
any two power leads.
• To reverse the rotation on single phase units,
disconnect and lock-out the power, then rewire the
motor per the motor manufacturer’s instructions.
6. Check for unusual noise, vibration or overheating
of the bearings. Reference the Troubleshooting
section for corrective actions. Excessive vibration
Pre Start-Up
5
may be experienced during the initial start-up. Left
unchecked, it can cause a multitude of problems
including structural and/or component failure.
Generally, fan vibration and noise is transmitted
to other parts of the building by the ductwork. To
minimize this undesirable effect, the use of heavy
canvas duct connectors is recommended.
7. Measure the motor’s voltage, amps and RPM.
Compare to the specications. Motor amps can be
reduced by lowering the motor RPM or increasing
system static pressure. Additional starters and
overloads may be provided in the make-up air
control center for optional exhaust blowers. Any
additional overloads must be checked for proper
voltage and amps.
8. Measure the unit’s air volume (cfm) and compare
it with its rated air volume. If the measured air
volume is wrong, adjust the fan’s RPM by changing/
adjusting the drive. The most accurate way to
measure the air volume is by using a Pitot traverse
Control Panel Parts
1. Contactor
2. Overload
3. Three phase
transformer #A
4. 120 - 24v
transformer #B
5. Ignition control
6. High Temp Overload
7. Mild weather thermostat
to damper
8. Damper motor
9. Terminal blocks
10. Circuit breaker
11. Override switch
12. 120v spark ignitor
13. Pressure sensing probe
(high)
14. Pressure sensing probe
(low)
15. Temperature controller
16. Thermostat to blower
17. Safety Shut off valve
18. Pressure gauge
19. Gas valve
20. Modulating gas valve
21. Pressure gauge
22. Safety Shut off valve
23. Optional V.F.D. here
Testing Inspection
All components of this or any other gasred heating unit must be leak tested prior
to placing the unit into operation. The
factory piping has been checked for leaks
but should be rechecked due to shipping &
installation issues. The eld-installed shutoff
valve should also be checked.
A soap & water solution should be used to
perform this test.
Never test for gas leaks with a ame.
When leak testing pressures that are less
than or equal to 14 in. wc (3.5 kPa), rst
close the eld-installed shutoff valve to
isolate the unit from gas supply line.
When leak testing presures that are more
than 14 in. wc (3.5 kPa), close the eld-
installed shutoff valve, disconnect the
furnace & gas train from the gas supply line
& plug the supply line before testing.
All piping should be clean & free of any
foreign matter, which may damage the
values, regulators or burner.
Control Panel
16
17
1
2 3 4 5
23
9
10 11
18
13
19
20
12
7
6
8
15
14
21
22
Loading...