NATURAL GAS HIGH ALTITUDE CONVERSION INSTRUCTIONS Applies to : Gas-Fired, Tubular, Radiant, Low-Intensity Infrared Heater Models VPS, VPT, VCS, VCT Part no.
Section 1 …………VPS Three Fixing Fan. Section 2 ……… VPS Four Fixing Fan. Section 3 ……… VPT, VCS/T Three Fixing Fan. Fresh Air Inlet Plate Type Size 60 80 100 125 VPS 3 Hole * * * * 150 170 200 * * * VPS 4 Hole Section 4 …………VPT, VCS/T Four Fixing Fan. VPT/VCT 3 hole * * * * * * VPT/VCT 4 hole * VCS 3 hole * * * * * * VCS 4 hole VPS Model Fan orifice plate Size 60 Remove plate with ‘X’ 8 Qty. of holes (10mm) Add plate with ‘X’ Qty.
Section 1 Three Fixing Fan Procedure Step 1: Remove the nuts securing the fan orifice plate with an 8mm wrench. Remove the fan orifice plate from the threaded studs. Step 2: Fit the new high altitude fan orifice plate onto the fan studs. Re-fit the 3 x 8mm nuts, using the wrench to tighten. Final Step Ensure that when converted for use at high altitude, the data label is amended. Cover the previous ‘X’ (highlighted in a circle) with a blank label.
Burner Top Cover VPT, VCS/T Models Fan Orifice Plate Size (VCS only) 60 Remove plate with ‘X’ 8 Qty. of holes (10mm) Add plate with ‘X’ Qty. of 9 holes (10mm) 80 100 125 150 170 200 7 8 11 11 15 18 9 10 14 15 26 22 Size (VPT/VCT only) 60 Remove plate with ‘X’ 6 Qty. of holes (10mm) Add plate with ‘X’ Qty. of 9 holes (10mm) 80 100 125 150 170 200 10 8 11 15 11 18 11 11 14 18 18 22 There are two types of combustion fan.
On VPT, VCS/T models, remove the top cover of the burner using a No.2 cross headed screwdriver to expose the combustion fan. . Step 3: Fit the new high altitude fan orifice plate onto the fan studs. Re-fit the 3 x 8mm nuts, using the wrench to tighten. Step 4: Refit the fan and the lid of the burner. Section 3 Three Fixing Fan Procedure Section 4 Step 1: Remove the four screws arrowed, three of these cannot be seen in the picture. Lift out the fan assembly.
VPT, VCT Model Data Label Step 2: Using a no.2 crosshead screwdriver remove the four screws securing the fan orifice plate and remove. VCS Model Data Label Step 3: Fit the new high altitude fan orifice plate and secure with the same four screws. Take care not to cross thread the screw fixings. Step 4: Refit the fan and the lid of the burner. Final Step Ensure that when converted for use at high altitude, the data label is amended. Cover the previous ‘X’ (highlighted in a circle) with a blank label.
Natural Gas High Altitude Conversion Kits Models VPS 60 VCS 60 VPT 60 VCT 60 VPS 80 VCS80 Natural Gas High Altitude Conversion Kit 270630 Quantity Description Part No. 1 Natural Gas High altitude conversion manual VC/VP 270687 1 Blown fan orifice plate to suit 2576T, 9 x 10mm square holes 269924 Models VPT 80 VCT 80 VPS 100 VCS 100 VPT 100 VCT 100 Natural Gas High Altitude Conversion Kit 270631 Quantity Description Part No.
Orifice Pressure Adjustment (VPS/VCS) USA Natural Gas 2001– 4000 ft (611-1220m) Size 60 80 100 125 150 170 200 “WC 4.0 3.3 3.3 3.9 4.0 3.2 3.3 mbar 10.0 8.2 8.2 9.7 10.0 8.0 8.2 USA Natural Gas 4001– 6000 ft (1221-1829m) Size 60 80 100 125 150 170 200 “WC 4.0 3.3 3.3 3.9 4.0 3.2 3.3 mbar 10.0 8.2 8.2 9.7 10.0 8.0 8.2 USA Natural Gas 6001– 10000 ft (1830-3048m) Size 60 80 100 125 150 170 200 “WC 3.9 3.2 3.2 3.8 3.9 3.1 3.2 mbar 9.7 8.
Orifice Pressure Adjustment (VPT/VCT) USA Natural Gas 2001– 4000 ft (611-1220m) Size 60 80 100 125 150 170 200 “WC Hi 4.1 3.7 4.7 4.3 4.2 3.8 3.3 mbar Hi 10.2 9.2 11.7 10.7 10.5 9.5 8.2 “WC Lo 2.3 2.1 2.0 2.5 2.0 2.2 2.0 mbar Lo 5.7 5.2 5.0 6.2 5.0 5.5 5.0 USA Natural Gas 4001– 6000 ft (1221-1829m) Size 60 80 100 125 150 170 200 “WC Hi 4.1 3.7 4.7 4.3 4.2 3.8 3.3 mbar Hi 10.2 9.2 11.7 10.7 10.5 9.5 8.2 “WC Lo 2.3 2.1 2.0 2.5 2.0 2.
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