LOCATE VENT OPENING
After the location of the heater has been determined, the opening for the vent pipe should be cut. If the heater is to be recessed, cut out opening for heater between studs on the interior wall and cut out the floor plate between the studs, so heater will set flat on floor as all dimensions are given from a finished floor. The height of the cut out for a 40,000 BTU model is 78-5/8”, for the 55,000 and 62,500 models the cut out height is 87-5/16”. NOTE: This dimension may be increased to allow more room for installation and making the wiring connection, then refinished.
Next, cut out a 9-1/4” opening in exterior wall for the vent tubes to pass through. The center of opening for the 40,000 BTU furnace is 59”, the center for opening for 55,000 and 62,500 BTU furnaces is 68-1/2”. See Figure 5, on Page 6.
If the heater is to be surfaced mounted, cut out 9-1/4” opening through the interior and exterior wall. The center of cut out will be 59” for 40,000 BTU and 68-1/2” for 55,000 and 62,500 BTU models. Be sure both cutouts are level with each other.
INSTALLING THE FURNACE
The vent system supplied with this furnace will accommodate walls ¾” (when recessed) up to 12” thick. Use only the exhaust tube, air intake tube and vent cap supplied with heater. Do not attempt to lengthen the exhaust or air intake tubes, this could cause an imbalance in the heater resulting in poor performance and pilot outage (See Figure 6).
Measure exact distance “X” between surface on which back of cabinet will rest (inside of recessed cavity or face of wall when freestanding) and the outside wall surface (see Figure 6).
Inlet Air Tube “A” – Measuring from gasketed surface, mark and cut pipe same as dimension “X”. Remove any burrs.
Vent Exhaust Tube “B” – Measuring from gasketed surface, mark and cut pipe 1-3/4” greater than dimension “X”. Remove any burrs.
Fasten vent exhaust tube “B” to heat exchanger collar and Inlet Air Tube “A” to flange on back of furnace using 16 # 3/8 screws (“C”) provided. Be sure gaskets are in place and not damaged. Anytime the vent pipes are removed check and replace gaskets (if necessary). Failure to replace missing or damaged gaskets may expose homeowner to life threatening conditions.
Secure furnace in place using 2 holes provided in bottom of casing. NOTE: Make sure both tubes are centered in cut out. Slide the vent cap onto the pipes extending from the back of the furnace. A rotating or twisting motion will ease this installation. Secure vent cap and vent cap spacer plate to wall causing the vent tubes to have a slight downward pitch. This will prevent water from entering. Anchors (not provided) may be required. Caulk around vent cap spacer plate with caulking provided. NOTE: Some framing may be necessary to provide a flat surface against the vent cap spacer plate and to prevent rain from entering the wall opening.
| | Heat |
Vent | | Exchanger |
Cap | Vent Cap | Collar |
| |
| Spacer | |
| Plate | |
| | |
FIGURE 6 | | |
| GAS CONNECTION |
Make the gas connection between the manual shut off valve and the furnace gas control valve with approved ½” connectors. Compounds used on threaded joints of gas piping shall be approved for use with L.P. gas. The gas lines must be checked for leaks by the installer with soapy water or liquid detergent, never use an open flame. If connections are not exposed, a pressure test must be run. Be sure to disconnect the gas supply line from the appliance valve before pressure testing. The manifold pressure is pre-set at the factory and should be 3.5” w.c. for Natural Gas and 10” w.c. for L.P. Gas. The minimum inlet pressure for Natural Gas is 4.5” w.c. and 11” w.c. for L.P. Gas, “for purpose of input adjustment”. The maximum inlet pressure should never exceed 7.0” w.c. on Natural Gas or 14” w.c. on L.P. Gas.
THERMOSTAT INSTALLATION
Follow the instructions included with the thermostat. Select a location for the thermostat on an inside wall approximately 5 feet above the floor where it won’t be affected by heat or cold sources such as direct sunlight, televisions, fireplaces, hidden hot or cold water pipes, drafts, etc., and a minimum of 4’ from the heater. The thermostat must never be placed in an adjacent room. Connect thermostat wires to thermostat and mount to wall. Run wire to furnace and make connections to thermostat wires coming out of top of furnace. Use insulated staples (provided) to secure wire to wall.
OPERATION
This unit uses a “step action” valve. When the heater comes on initially, it operates at a lower pressure to insure proper, quiet, ignition. After 20 seconds or less, it automatically steps up to the proper manifold pressure with a discernable increase in flame height.
After the heat exchanger has warmed sufficiently, the fan will automatically come on to efficiently transfer the heat into the room. NOTE: All but the 40,000 BTU unit (which is one-speed) have an automatic two-speed fan.
