15
Suburban DynaPack S & H Series Owner's Manual 06/2020 Rev.2
Chapter 3: Unit Startup & Operation
WARNING
Failure to follow these instructions may lead to a fire, explosion, property damage, personal injury, or loss of
life.
CAUTION
This furnace is equipped with a direct ignition control Do not attempt to manually light the burners.
BEFORE OPERATING
, smell all around the appliance area for gas. Be sure to smell next to the floor because gas is heavier than air and
will settle on the floor. If you smell gas STOP. Open the windows and doors to clear out any gas. Recheck all gas piping and connections
for leaks.
3.1 TO CHECK UNIT OPERATION
1. Make sure the gas valve is switched ON. Remove the gas compartment door. Turn the gas valve knob or move the switch to the
ON position. See figure 10. Do not use any tools to turn the knob. If you are unable to push in and turn the knob by hand then call
a qualified service technician for assistance. Replace the gas compartment door.
2. Turn on electrical power to the unit.
3. Switch the room thermostat to heat.
4. Raise the set point to above the room temperature.
5. The thermostat will call for heat and the combustion blower will begin to operate.
6. The combustion blower will operate for 15 to 20 seconds before the ignition controls begins sparking, then the gas valve will open
and the burners will light. The burners can be viewed through the sight glass in the door panel.
7. The room air blower starts 30 seconds after the burners light.
8. Once the room reaches the set temperature, the burners turn off and the room air blower turns off 90 seconds later.
9. Switch the room thermostat over to cooling.
10. Lower the set point to below the room temperature.
11. After a slight delay the room air blower will begin to run and the compressor will start. Note: There will be a 5 minute delay in the
compressor starting if the thermostat set point was raised and then lowered again.
12. Once the room reaches the set temperature, the compressor will turn off and the room air blower will turn off 30 seconds later.
3.2 TO SHUT DOWN UNIT
To turn off the unit switch the room thermostat to OFF. Turn the electrical power off and close the manual gas supply valve before
performing any service to the unit.
3.3 HEATING ADJUSTMENTS
1. Turn off the unit at the room thermostat and shut off the manual gas valve.
2. Connect a pressure gauge with suitable range (0 to 10” for natural and 0 to 15” for LP) to the inlet pressure port on the gas valve.
See figure 10.
3. Open the manual gas valve and turn the unit on.
4. Once the furnace is operating, check the inlet gas pressure. Adjust the pressure regulator to obtain an inlet pressure of 5” to 10”
water column for natural gas and 11” to 13” for LP gas.
5. Turn off the unit and shut off the manual gas valve.
6. Move the pressure gauge to the manifold pressure port on the gas valve. See figure 10.
7. Once the furnace is operating, check the manifold pressure. Adjust the gas valve pressure regulator to obtain a manifold pressure
of 3.5” water column for natural gas and 10.0” water column for LP gas.
8. On natural gas installations the input to the furnace must be checked to insure safe operation. Any other gas appliances that use
the gas meter must be turned off including the pilot lights.
9. With the Dynapack furnace running, count the time it takes for the gas meter to make one revolution. Also record the gas meter
rate of cubic feet per revolution. You will also need the average heating value of the natural gas for your location. Plug these factors
into the equation below to calculate the gas input rate to the furnace in BTU per hour.
BTU/HR Input
=
Cubic Feet Per Revolution
X 3600 X Heating
Valve
Number of Seconds Per Revolution