Table of Contents
Advertisement
Service Facts
WARNING
L
!
CARBON MONOXIDE POISONING HAZARD
Failure to follow the steps outlined below for each
appliance connected to the venting system being
placed into operation could result in carbon monoxide
poisoning or death.
The following steps shall be followed for each appliance
connected to the venting system being placed into
operation, while all other appliances connected to the
venting system are not in operation:
1. Seal any unused openings in the venting system.
2. Inspect the venting system for proper size and
horizontal pitch, as required in the National Fuel Gas
Code, ANSI Z223.1/NFPA 54 or the CAN/CGA B149
Installation Codes and these instructions. Determine
that there is no blockage or restriction, leakage,
corrosion and other deficiencies which could cause an
unsafe condition.
3. As far as practical, close all building doors and
windows and all doors between the space in which the
appliance(s) connected to the venting system are
located and other deficiencies which could cause an
unsafe condition.
4. Close fireplace dampers.
5. Turn on clothes dryers and any appliance not
connected to the venting system. Turn on any exhaust
fans, such as range hoods and bathroom exhausts, so
they are operating at maximum speed. Do not operate
a summer exhaust fan.
6. Follow the lighting instructions. Place the appliance
being inspected into operation. Adjust the thermostat
so appliance is operating continuously.
7. If improper venting is observed during any of the above
tests, the venting system must be corrected in
accordance with the National Fuel Gas Code,
ANSI Z221.1/NFPA 54 and/or CAN/CGA B149
Installation Codes.
8. After it has been determined that each appliance
connected to the venting system properly vents where
tested as outlined above, return doors, windows,
exhaust fans, fireplace dampers and any other gas-fired
burning appliance to their previous conditions of use.
SEQUENCE OF OPERATION
Thermostat call for heat
R and W thermostat contacts close signaling the control
module to run its self-check routine. After the control module
has verified that the pressure switch contacts are open and
the limit switch(es) contacts are closed, the draft blower will be
energized.
As the induced draft blower comes up to speed, the pressure
switch contacts will close and the ignitor warm up period will
begin. The ignitor will heat for approximately 17 seconds, then
the gas valve is energized to permit gas flow to the burners.
The flame sensor confirms that ignition has been achieved
within the 4 second ignition trial period.
4
SAFETY SECTION
The cabinet must have an uninterrupted or unbroken
ground according to National Electrical Code, ANSI/NFPA
70 - "latest edition" and Canadian Electrical Code, CSA
C22.1 or local codes to minimize personal injury if an
electrical fault should occur.
Failure to follow this warning could result in an electrical
shock, fire, injury, or death.
The integrated furnace control is polarity sensitive. The
hot leg of the 115 VAC power must be connected to the
BLACK field lead.
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result
in serious injury, death or property damage.
Never test for gas leaks with an open flame. Use a com-
mercially available soap solution made specifically for
the detection of leaks to check all connections. A fire or
explosion may result causing property damage, personal
injury, or loss of life.
FIRE OR EXPLOSION HAZARD
Failure to follow the safety warnings exactly could result
in serious injury, death or property damage.
Improper servicing could result in dangerous operation,
serious injury, death, or property damage.
After the flame sensor confirms that ignition has been
achieved, the delay to fan ON period begins timing and after
approximately 45 seconds the indoor blower motor will be
energized and will continue to run during the heating cycle.
When the thermostat is satisfied, R and W thermostat contacts
open, the gas valve will close, the flames will extinguish, and
the induced draft blower will be de-energized. The indoor
blower motor will continue to run for the fan off period (Field
selectable at 60, 100, 140 or 180 seconds), then will be de-
energized by the control module.
WARNING
L
!
CAUTION
L
!
WARNING
L
!
WARNING
L
!
UH1-H-SF-1E
Advertisement
Table of Contents
