Instructions for using the low pressure gauge:

TIP: Air pump pressure is the pulse of the heater. Pump pressures range from 3 psi to 8 psi depending on heater BTU size (see chart below). A loss of ONLY 1 psi translates to a 30% to 17% loss of FUEL FLOW (starvation). You must know the specified required pressure and set the pressure accordingly.

Mr Heater units are extremely dependant upon pump pressure being properly set. If the pressure is off by 1/2 psi, the heater may shut down because of IGNITION FAILURE. The only way to correct this problem is to set the pump pressure to Enerco's recommended pressure specification (see chart below).

HA1181 air-filled low pressure gauge. All plumbing included.__________

HA1182 liquid-filled low pressure gauge. All plumbing included. The advantage of the liquid-filled gauge is the dampening effect of the liquid while the pump is pulsating. The needle remains steady.

 

 
  1. The FIRST STEP in diagnosing any heater problem should be checking the output of the air pump. Determine the air pressure required for the heater model that is being tuned. The air pump, in turn, is responsible for fuel delivery.
  2. If you do not know the required pressure refer to the chart displayed below.
  3. Your plastic Housing inlet looks like this......23255, Housing inlet  has 2 threaded holes. The hole on the left has a solid plug inserted. Remove the plug. Screw in the nipple end of the gauge into the threaded hole. Check for air leaks with soapy water.
  4. The other hole has a screw with a hole which adjusts a ball and spring check valve assembly. Carefully adjust the screw until the gauge is reading the pressure level that is specified on the chart below.
  5. Replace plug. Test for leak.
  6. If you are unable to reach the desired pressure spray soapy water around the seal of the end cover- at the same time check the plastic cover for a crack. A cracked end cover will not allow the heater to perform properly and will not allow for an accurate reading. The pump must be set at the specified pressure in order to have adequate fuel delivery an adequate fuel atomization. Replace if needed.
  7. If you set the pressure to specs and the heater does not perform properly or the cone does not glow a soft red, then check for other fuel delivery problems such as a clogged fuel filter, cracked rubber hose, clogged or worn nozzle, or a cracked nozzle adapter. Soapy water lightly sprayed in these areas will quickly identify the problem most of the time. Any air leak will create problems.

 

PRESSURE SETTINGS

Kerosene forced air heaters Pressure rating
 50,000 btu 3.5 psi
 75,000 btu 4.2 psi
 125,000 btu 5.0 psi
 175,000 btu 5.8 psi
 210, 000 btu 8.5 psi