Limit Switch; Optional Operation - COZY 90N30A Installation And Operating Instructions Manual

If difficulty in adjusting the burner is experienced, it may be the result of incorrect gas supply pressure or manifold pressure.
Pressure can only be checked and adjusted by a trained service technician using instruments designed for that purpose.
WARNING: Do not attempt to change pressure settings without proper training and instruments.
To do so may cause your floor furnace to malfunction resulting in property damage, bodily injury, or
death.
The following information is provided for use by a trained service technician with measuring instruments.
Minimum Inlet Pressure, Natural Gas.............................................................
Minimum Inlet Pressure, Liquefied Petroleum (L.P.) Gas......................................
Maximum Inlet Pressure for Natural Gas.........................................................
Maximum Inlet Pressure, Liquefied Petroleum (L.P.) Gas.....................................
(If the inlet pressure is found to exceed 14.0 inches water column, check the performance of the control valve thoroughly as
damage may have occurred. If manifold pressure cannot be adjusted, replace the control valve).
Manifold Pressure, Natural Gas....................................................................
Manifold Pressure, Liquefied Petroleum (L.P.) Gas............................................
Your floor furnace has been designed to meet all safety requirements of the American National Standards Institute and
government regulations by offering two modes of operation.
OPTION 1. Place the furnace key on the damper control
rod (See Figure 21) and turn counterclockwise
until the warning flag is concealed and the damper is
open. Your floor furnace will now cycle on and off
maintaining a moderate grill temperature and an even
room temperature. Your floor furnace will function best
on this setting during mild weather.
OPTION 1
In mild weather,
operate furnace
with damper open.
Furnace will cycle
on and off main-
taining a moderate
grill temperature
and an even room
temperature.
FIGURE 21
WARNING
FLOOR FURNACE GRILLS BECOME
HOT WHEN FURNACE IS IN
OPERATION. CONTACT OF BARE
SKIN WITH GRILL MAY RESULT IN
SEVERE BURNS. KEEP CHILDREN
OFF, PROVIDE FENCE OR REGISTER
GUARD FOR THEIR PROTECTION.
ADJUSTING THE BURNER – Continued

OPTIONAL OPERATION

OPTION 2. Turn the furnace key clockwise
warning flag reading "WARNING – GRILL IS HOT – Keep off –
can cause burns" is visible and the damper is closed. The limit
control will now cease to function and the floor furnace will now
put out the maximum amount of heat until the room temperature
reaches the thermostat setting. Use this option only in extremely
cold weather. If furnace continues to cycle on limits, assure that
damper door is 100% closed by adjusting damper door pin if
necessary.
OPTION 2
In extremely cold
weather, close damper
(which exposes warning
plate). Furnace will then
Damper
Open put out maximum
amount of heat until
room temperature
reaches setting on wall
thermostat.
FIGURE 22
Page 13
4.5 Inches Water Column
11.0 Inches Water Column
7.0 Inches Water Column
14.0 Inches Water Column
3.5 Inches Water Column
10.0 Inches Water Column

LIMIT SWITCH

TEMPERATURE SETTINGS
90{N,P}30A..........................
90{N,P}50A..........................
90{N,P}65A..........................
90{N,P}75A..........................
until the
Damper
Closed
140N
160N
180N
170N