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WARNINGS
WARNING: Improper installation, adjustment,
alteration, service or maintenance can cause
property damage, injury or death. Read the
installation, operation, and maintenance instruc-
tions thoroughly before installing or servicing this
equipment. For assistance or additional informa-
tion consult a qualified installer, service agency, or
gas supplier.
WARNING: When used without fresh air, heater
may give off CARBON MONOXIDE, an odorless
poisonous gas. OPEN WINDOW AN INCH OR
TWO FOR FRESH AIR WHEN USING HEATER.
WARNING: This heater is equipped with a PILOT
LIGHT SAFETY SYSTEM. DO NOT TAMPER
WITH PILOT LIGHT SAFETY SYSTEM.
WARNING: If heater shuts off, do not relight until
you provide fresh air. If heater keeps shutting off,
have it serviced. Keep burner and control clean.
Open door for 5 minutes.
Maintain clearances as shown in Figure 2 or on
heater nameplate.
• DO NOT USE MATCH OR OTHER FLAME
FOR LEAK TESTING.
• DO NOT EXCEED 1/2 PSI INLET PRESSURE
TO HEATER.
DANGER: Carbon monoxide poisoning may lead to
death.
Carbon Monoxide Poisoning:
Early signs of carbon monoxide poisoning resemble the
flu, with headaches, dizziness, or nausea. If you have
these signs, the heater may not be working properly. Get
fresh air at once! Have heater serviced. Some people are
more affected by carbon monoxide than others. These
include pregnant women, persons with heart or lung
disease or anemia, those under the influence of alcohol,
and those at high altitudes.
CAUTION
• Never connect gas valve or thermostat to line voltage
or a transformer.
• If the infra-red color of the grid becomes dull when the
building furnace is operating, consult gas supplier on
correct gas supply piping sizes.
• This heater is for indoor installation only!
NOTE
Gasket binder material used in this heater assembly will
temporarily emit an odor and/or vapor. This condition will
clear up in approximately 20 minutes and thereafter will
not reoccur. Refer to Chapter 2 for ventilation.
TABLE OF CONTENTS
Chapter Title Page
I Introduction ............................................ 3
II Heater Installation .................................. 5
III Heater Operating Instructions ................. 10
IV Operator Maintenance Instructions ......... 12
V Replacement Parts List .......................... 15
2
Installation instructions and Owner’s Manual
Model # MH25NG/LP HS25NG/LP