GMS8 User Information Manual
5
I
NDOOR
H
UMIDITY
Relative humidity is the amount of water vapor in the air
relative to the amount the air can hold at the same tem-
perature. The colder the air; the less moisture it can hold.
As air is warmed, its ability to hold moisture is increased.
Relative humidity is important to your health and home as
proper humidification helps reduce respiratory difficulties
and helps improve the indoor air quality.
A good relative humidity is one just high enough to barely
start condensation along the lower edges or lower corners
of the windows. More than that can be damaging.
Frequent fogging or excessive condensation on inside win-
dows indicates the indoor humidity level is too high for
outdoor weather conditions. Damage to the building may
result if the condition persists. Condensation on inside of
storm windows indicates a poor seal inside windows. Add-
ing weather-stripping to tighten inside windows usually cor-
rects this problem.
The following table shows the recommended maximum in-
door humidity in relationship to the outdoor temperatures.
Outdoor Humidity
Temperature Single -Paned Double-Paned
Glass Glass
+30°F 30% 50%
+20°F 20% 40%
+10°F 15% 35%
0°F 10% 30%
-10°F 5% 25%
-20°F 5% 20%
-30°F 3% 18%
P
ROPANE
(LP) G
AS
I
NSTALLATIONS
O
NLY
For furnaces operating on propane gas, please review the
following warnings before use.
T
O
AVOID
PROPE RTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
,
DUE
TO
EXPLOSION
OR
FIRE
,
INSTALL
A
GAS
DETECTING
WARNING
DEVICE
.S
INCE
THE
ODORANT
IN
PROPANE
GAS
CAN
BE
REDUCED
BY
IRON
OXIDE
(
RUST
),
A
GAS
DETECTING
WARNING
DEVICE
IS
THE
ONLY
RELIABLE
METHOD
TO
DETECT
PROPA NE
GAS
LEA KS
.
WARNING
I
F
THE
GAS
FURNACE
IS
INSTALLED
IN
A
BASEMENT
,
AN
EXCAVATED
AREA
OR
CONFINED
SPACE
,
IT
IS
STRONGLY
RECOMMENDED
TO
CONTACT
A
PROPANE
SUPPLIER
TO
INSTALL
A
GAS
DETECTING
WARNING
DEVICE
IN
CASE
OF
A
GAS
LEA K
.
S
INCE
PROPA NE
GAS
IS
HEAVIER
THAN
AIR
,
ANY
LEAKING
GAS
CAN
SETTLE
IN
ANY
LOW
AREAS
OR
CONFINED
SPACES
.
P
ROPANE
GAS
ODORANT
MAY
FADE
,
MAKING
THE
GAS
UNDETECTABLE
EXCEPT
WITH
A
WARNING
DEVICE
.
•
•
WARNING
A
N
UNDETECTED
GAS
LEA K
WILL
CREATE
A
DANGER
OF
EXPLOSION
OR
FIRE
.I
F
THE
PRESENCE
OF
GAS
IS
SUSPECTED
,
FOLLOW
THE
INSTRUCTIONS
ON
THE
COVER
OF
THIS
MANUAL
.F
AILURE
TO
DO
SO
COULD
RESULT
IN
SERIOUSPERSONALINJURYORDEATH.
WARNING
T
HERMOSTAT
F
UNCTIONS
There are many types and styles of thermostats but opera-
tion is usually similar. BE SURE TO BECOME FAMILIAR WITH
YOUR THERMOSTAT. The simplest type of thermostat only
starts and stops the furnace to maintain the desired room
temperature. The most widely used types will control both
heating and cooling functions and will have a Fan Switch
with Auto and ON settings. On Auto, the circulating air
blower will cycle on/off with the furnace but if switched
to ON it will run continuously regardless of whether or not
heating or cooling is being provided.
In addition, there are thermostats which automatically
switch from heating to cooling mode and those with night
set back capability. The night set back, or multiple set
back, type allows for a different temperature at night or
during the day when no one is at home. Programmable
thermostats will allow for more control and tailoring of the
heating and cooling functions. The level of this control
depends on the type of thermostat applied.
Fan Switch
Cool/Heat
Switch
Cool/Heat
Temperature
Control Dials
Room Temperature
Thermostat
System
Switch
Fan
Switch
Action
OFF AUTO
None
COOL AUTO
System only cools, fan
cycles off and on.
COOL ON
System only cools, fan
runs all the time.
HEAT AUTO
System only heats, fan
cycles off and on.
HEAT ON
System only heats, fan
runs all the time.
OFF ON
No heating or cooling,
fan runs all the time.