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MHSC BUF400 - page 1
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MHSC BUF400 - page 2
2 61D1013 ...
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MHSC BUF400 - page 3
61D1013 3 9. The installation must conform with local codes or , in the absence of local codes, with the 10. This unit complies with ANSI Z21.91.2001 ventless fire box enclo sures for gas-fir ed unven ted decor ati ...
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MHSC BUF400 - page 4
4 61D1013 Continuedfrompage3 15. An unvented gas-fired heater uses air (oxygen) from the room in which it is installed. Provisions for adequate combustion and ventilation air must be provided. See installation guidelines. 16. Keep room area clear and fr ...
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MHSC BUF400 - page 5
61D1013 5 The BUF 400 and BU F500 are vent -fr ee fi rebo xes and featu re a self cont aine d hea t-c irc ulat ing syst em. Th is un it al so features a 2-in1, flexible-face system that converts the circulating system into a radiant system in seconds. This installation manual will enable you to obtain a safe, efficient and dependable installatio ...
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MHSC BUF400 - page 6
6 61D1013 BUF400: 24 13 / 16 " 2 3 / 16 " 6 9 / 16 " 10 3 / 8 " 14 7 / 16 " BUF400: 40" BUF400: 36" 24 1 / 4 " 6 1 / 2 " 21 9 / 16 " 21" 34" 6" 2" BUF500: 30 13 / 16 " BUF500: 46" BUF500: 42" In pl annin g the in stal lati on for the appl ianc e it is nec essa ry t ...
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MHSC BUF400 - page 7
61D1013 7 17" 21 1 / 2 " BUF400: 35 1 / 2 " BUF400: 20 3 / 8 " BUF500: 26 3 / 8 " BUF500: 41 1 / 2 " ? ...
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MHSC BUF400 - page 8
8 61D1013 9" Minimum 42" Minimum 9" Minimum Ensure that minimum clearances shown in Figures 4 through 7 are maintained. Left and right clearances are determined when facing the front of the firebox. Follow these instructions carefully to ensure safe installation. Failure to follow these requirements may create a fire hazard. 1. ? ...
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MHSC BUF400 - page 9
61D1013 9 12" 10" 8" 6" 2 1 / 2 " 12" 16" 19" 21" 23" and 4. The ca no py sup pl ie d w ith th e uni t must be installed. If a comb ...
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MHSC BUF400 - page 10
10 61D1013 20 5 / 16 " 400: 40 1 / 4 " 400: 66 1 / 8 " 400: 24 13 / 16 " 500: 30 13 / 16 " 500: 46 1 / 4 " 500: 72 5 / 8 " 400: 46 3 / 4 " 500: 51 3 / 8 " 400: 33 1 / 16 " 500: 36 5 / 16 " 400: 12 3 / 4 " 500: 16 " 400: 24 13 / 16 " 400: 40 1 / 4 " 1 / 2 " or 5 / 8 &quo ...
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MHSC BUF400 - page 11
61D1013 1 1 1. Bend out the nailing flanges located on each side of the firebox. 2. Slide the firebox into prepared framing or position firebox in its final position and frame later . 3. Level the firebox by checking the top edge of the firebox. Shim if necessary . 4. Anchor firebox to t ...
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MHSC BUF400 - page 12
12 61D1013 Consult all local codes. All gas piping must be installed to comply with local codes, or in the absence of local codes, with the latest edition of the National Fuel Gas Code ANSI Z223.1/NFP A54. Remove the baseplate for ease of gas line installation. Remove three (3) sc ...
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MHSC BUF400 - page 13
61D1013 13 A canopy is furnished with each firebox and MUST be installed for safe operation. SeeFigure14. 1. Locate three (3) holes at the top of the front frame. SeeFigure13. 2. Align the canopy with the holes i ...
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MHSC BUF400 - page 14
14 61D1013 If you are installing the forced air kit, Model F A2A, see the installation instructions provided with the kit for electri- cal wiring requirements, or the blower installation section. The firebox must be connecte ...
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MHSC BUF400 - page 15
61D1013 15 1 2 3 3 1 Canopy 1 26D4568 26D4706 2 Screen Panel 2 26D0131 26D0187 3 Screen Rod 2 26D0132 26D0133 4 Rear Refractory 1 61D0102 61D0107 5 Side Refractory 2 ...
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MHSC BUF400 - page 16
16 61D1013 8'max. 1. Locate combustion air assembly at an exterior location which is not likely to be accidentally blocked in any manner . Locate assembly a min. of 12" ...
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MHSC BUF400 - page 17
61D1013 17 The use of outside air for combustion is optional unless required by building codes. It is only necessary to supply outside combustion air to one side of the fireplace. Use the model AK4 combustion air kit. ? ...
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MHSC BUF400 - page 18
18 61D1013 7. If the duct is the insulated type, push the insulation back from one end of the duct approximately 2". SeeFigure21. 8. Slip the exposed end of the duct over the starting collar ...
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MHSC BUF400 - page 19
61D1013 19 ...
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MHSC BUF400 - page 20
The following components are warranted for life to the original owner , subject of proof of purchase: Firebox, Combustion Chamber , Heat Exchanger , Grate, and Stainless Steel Burners. The follow ...
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