Modine Manufacturing HD Installation And Service Manual - page 2
2
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
12-14" 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 vented to the outside atmosphere.
6. Do not install in potentially explosive or flammable atmospheres
laden with grain dust, sawdust, or similar air-borne materials. In
such applications a blower type heater installed in a separate room
with ducting, including appropriate back flow prevention dampers,
to the dust-laden 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 of the units.
8. To prevent premature heat exchanger failure do not locate ANY
gas-fired unit heaters in areas where chlorinated, halogenated or
acid vapors are present in the atmosphere.
9. Do not locate units in tightly sealed rooms or small compartments
(commonly referred to as confined spaces) without provision for
adequate combustion air and venting. Combustion air must have
access to the confined space through a minimum of two permanent
openings in the enclosure, at least one near the bottom. They
should provide a free area of one square inch per 1000 BTU per
hour input rating of the unit with a minimum of 100 square inches
for each opening, whichever is greater.
10. Do not install unit outdoors.
11. Do not locate unit closer to combustible materials than the
clearances listed. They are:
Top and Bottom 1"
Vent Connector 4"
Access Side 18"
Non-Access Side 1"
Rear 18"
12. Allow 18" clearance at rear (or 6" beyond end of motor at rear of
unit, whichever is greater) and access side 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 the minimum
specified if heat damage, other than fire, may occur to materials
above the unit heater at the temperature described.
14. Modine unit heaters are designed for use in heating applications
with ambient temperatures between -40° F and 90° F.
15. Be sure no obstructions block air intake and discharge of unit heater.
16. Do not attach duct work, air filters, or polytubes to any HD unit heaters.
17. Do not install units below 7' measured from the bottom of the unit to
the floor in commercial applications and 5' measured from the
bottom of the unit to the floor in residential applications.
18. 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 hangar and in accordance with the require-
ments of the enforcing authority and/or NFPA 409 – latest edition.
19. In commercial garages or other sections of aircraft hangars such as
offices and shops which communicate with areas used for servicing
or storage, keep the bottom of the unit at least 7' above the floor. In
public garages, the unit must be installed in accordance with the
Standard for Parking Structures NFPA 88A and 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.
20. Consult piping, electrical, and venting instructions in this manual
before final installation.
21. All literature shipped with this unit should be kept for future use for
servicing or service diagnosis. Do not discard any literature shipped
with this unit.
22. SERVICING OR REPAIRING THIS EQUIPMENT MUST BE
PERFORMED BY A QUALIFIED SERVICE AGENCY. Use only
Modine approved service replacement parts. A replacement parts
list can be found on page 18 of this manual, or may be obtained by
contacting Modine Manufacturing Company, Buena Vista, VA.
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.
23. Do not use this appliance if any part has been under water.
Immediately call a qualified service technician to inspect the
appliance and replace any gas control which has been under water.
24. Should overheating occur, or the gas supply fail to shut off, shut off
the manual gas valve to the appliance before shutting off the
electrical supply.
© Modine Manufacturing Company 1998
1. If you are replacing an existing heater, it may be necessary to resize
the venting systems. Improperly sized venting systems can result in
vent gas leakage or the formation of condensate. Refer to the
National Fuel Gas Code ANSI Z223.1 or CAN/CGA B149.1 or .2
latest edition. Failure to follow these instructions can result in serious
injury or death.
2. This heater is equipped with a power exhaust system. DO NOT use
any additional power exhaust systems or vent dampers. FAILURE
TO FOLLOW THESE INSTRUCTIONS could result in serious injury
or death.
SPECIAL WARNINGS
Figure 2
Typical Unit Suspension