Boiler Manual - Weil-McLain

GV90+ gas-fired water boiler — Boiler ManualPrepare the boiler (continued)Install high altitude air pressure switchwhen required (only above 5,500 feet)1. For installations at altitude more than 5,500 feet above sea level:a. A special high altitude air pressure switch is required.b. The gas valve outlet pressure setting must be checked, andadjusted if necessary, per the instructions on page 62.Failure to check gas valve outlet pressure and adjust, ifnecessary, could result in severe personal injury, deathor substantial property damage. Carefully follow theguidelines given in this manual.2. Obtain the GV90+ high altitude kit from your local Weil-McLaindistributor. The high altitude kit contains the high altitude airpressure switch.3. See Figure 8 (switch shown with wires removed).a. Remove the two (RED) control wires from the air pressureswitch spade terminals.b. Remove the factory-installed air pressure switch (loosen topscrew and remove bottom screw holding switch to jacket interiorpanel).c. Install the high altitude air pressure switch in the same location.d. Carefully replace the hoses on the new switch, with the red hoseon the hose barb closest to the electrical spade connectors, asshown in Figure 8. The white hose goes on the other hose barb.e. Replace the two (RED) control wires on the new pressureswitch spade terminals.Figure 81 Interior panel top2 Jacket left side panel3 Air pressure switch4 WHITE hose5 RED hose6 Mounting screwsFigure 9Air pressure switch mountingFollow instructions to perform the stepsshown belowRotate the boiler into positionBoiler is shipped on back side. It must be taken off skidand rotated into correct position.After installing condensate line, inspecting (replacing if necessary) thegas/air orifice and installing the high altitude kit (if required), movethe boiler near its position.Figure 9 shows the boiler with the front and top panels replaced.These panels may be left off if desired until the installation has beencompleted.Boiler is heavy and contains some sheet metal parts whichmay have sharp edges. Wear gloves when handling andtake proper precautions when moving. Failure to do sowill result in severe personal injury, death or substantialproperty damage.Refer to Figure 9 for placement sequence as follows:1 Wear heavy gloves — carefully rotate the boiler over onto itsbase rail legs.2 Clip the shipping strap securing the skid to the boiler block assembly.Remove the skid and strap.3 Attach the jacket rear panel as shown using (4) #10 x ½” screwsprovided in the accessory bag.10Part number 550-142-054/1211