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2. Insert a test line with tee between the pressure switch and blower. One piece of the tubing connects the pressure switch to the fitting at the back side of the induced draft blower housing. Connect the tee to the manometer as shown in Figure 5-20. Note: Always keep the pressure switch in the circuit when measuring. Switches incorporate internal bleeds to keep moisture out of the pressure switch line. 3. Using Table 5-4 on page 5-22 and the formula provided above, calculate the close value for the switch being worked with. 4. Start the furnace to call for heat. Observe the manometer reading increase (increasing pressure rise) as the induced draft blower comes up to speed. Ignition should start at a reading that is approximately the Close value that was earlier determined for the specific switch in Step 3. 5. With the furnace running in the full heat cycle, observe the pressure reading. Note this reading and compare it to the Open value shown for that switch in Table 5-4 on page 5-22. Using Armstrong P/N 44819-005 pressure switch for an example, the reading on pressure fall when the contacts open can be between – 0.54" W.C. and – 0.66" W.C. SRM-HW/ Service Reference Manual UNIT COMPONENTS Pressure Switch 0 -1" 1" 2" 3" 1/8" Tee Induced Draft Blower B A Incline Manometer = Tee installed for test purposes only FIGURE 5-20 Incline Manometer Connection SRM-HW/HWC 2/99 UNIT COMPONENTS Magic-Pak: HW/HWC 5-28 Compressors (*262) TABLE 5-5 Compressor Specifications (continued on next page) Mode. Compresso. Typ. Compresso. Mode. B/. (Tecumse. Only. Armstron. P/. (All) HWC123-1 Tecumseh Rotary RKA5512EXD -002-A4RK147-ET 39008C001 (All) HWC183-1 Tecumseh Recriprocating AWF5517EXN -089-A4AW501-ET 35125C009 (All) HWC243-1 Copeland Scroll -130ZR24KC PFV -42811- 005 (All) HWC303-1 Copeland Scroll -130ZR28KC PFV -42811- 006 (All) HWC182-11, -9, -7, -6 Tecumseh Recriprocating AWF5517EXN -089-A4AW501-ET 35125C009 (All) HWC242-11, -9 Copeland Scroll -130ZR24KC PFV -42811- 005 (All) HWC122-10, -8, -5, -4, -3, -1 Tecumseh Rotary RKA5512EXD -002-A4RK147-ET 39008C001 (All) HWC242-10, -8, -5, -4, -3, -1 Copeland Scroll ZR23K1 PFV -35136C005 (All) HWC302-9 Copeland Scroll -130ZR28KC PFV -42811- 006 (All) HWC182-8, -5, -4, -3, -2 Tecumseh Rotary RKA5518EXD -009-A4RK233-ET 39008C002 (All) HWC302-8, -5, -4, -3, -1 Copeland Scroll ZR28K1 PFV -35136C001 (All) HWC182-1 Copeland Scroll ZR18K1 PFV -35136C004 1 2 3 4 5 6 7 8 9 10 11 12 SRM-HW/ Service Reference Manual UNIT COMPONENTS 1 2 3 4 5 6 7 8 9 10 11 12 Voltag. Phas. RL. LR. Ru. Cap. Armstron. P/. Windin. Res. S/. Oi. Typ. Oi. Charg. Suctio. Lin. Discharg. Lin. 208/230 1 26.3 25/370 38514D002 N/A Mineral 200 Viscosity 12 oz. .50 (1/2)" .315 (5/16)" 208/230 1 48.3 35/370 38514D004 N/A Mineral 200 Viscosity 32 oz. .753 (3/4)" .378 (3/8)" 208/230 1 13.2 59.0 35/370 38514D004 2.45/1.17 Mineral 200 Viscosity 25 oz. .75 (3/4)" .50 (1/2)" 208/230 1 15.7 73.0 35/440 38514D010 2.74/.93 Mineral 200 Viscosity 38 oz. .75 (3/4)" .50 (1/2)" 208/230 1 48.3 35/370 38514D004 N/A Mineral 200 Viscosity 32 oz. .753 (3/4)" .378 (3/8)" 208/230 1 13.2 59.0 35/370 38514D004 2.45/1.17 Mineral 200 Viscosity 25 oz. .75 (3/4)" .50 (1/2)" 208/230 1 26.3 25/370 38514D002 N/A Mineral 200 Viscosity 12 oz. .50 (1/2)" .315 (5/16)" 208/230 1 12.9 62.5 30/370 38514D003 3.03/.98 Mineral 200 Viscosity 26 oz. .75 (3/4)" .50 (1/2)" 208/230 1 15.7 73.0 35/440 38514D010 2.74/.93 Mineral 200 Viscosity 38 oz. .75 (3/4)" .50 (1/2)" 208/230 1 45.0 25/370 38514D002 N/A Mineral 200 Viscosity 12 oz. .63 (5/8)" .315 (5/16)" 208/230 1 15.0 76.0 35/370 38514D004 2.53/.77 Mineral 200 Viscosity 26 oz. .75 (3/4)" .50 (1/2)" 208/230 1 10.7 50.0 25/370 38514D002 4.91/1.29 Mineral 200 Viscosity 24 oz. .75 (3/4)" .50 (1/2)" SRM-HW/HWC 2/99 UNIT COMPONENTS Magic-Pak: HW/HWC Manufacturer: Tecumseh TABLE 5-6 Tecumseh Rotary Compressor Specifications Armstron. P/. Supplie. Mode. Numbe. Supplie. B/. Numbe. . . . . Cap. Req'. MDF-VA. Oi. (oz.. 39008C001 RKA5512EXD -002-A4RK147ET 10.62 10.06 .500 8.56 25/370 12 39008C002 RKA5518EXD -009-A4RK233ET 11.50 10.94 .630 8.78 25/370 12 All measurements in inches unless otherwise specified. .75 Diameter Holes " Deep. A B C DI.D. Copper Tube .(43 - .50" Suction .315 I.D.Copper Tube " Discharge C S R Top View FIGURE 5-21 Tecumseh Rotary Compressor Side View SRM-HW/ Service Reference Manual UNIT COMPONENTS Manufacturer: Tecumseh TABLE 5-7 Tecumseh Reciprocating Compressor Specifications Armstron. P/. Supplie. Mode. Numbe. Supplie. B/. Numbe. Voltag. Hz. Crankcas. Heate. L.R.A. P.H. Cap. Req'. 35125C009 AWF5517EXN -089-A4AW501ET 208/230 60 No 48.3 1 35 MFD @ 370V .753"/.756" I.D. Copper Tube Suction 12.647" 12.753” .378"/.381" I.D. Copper Tube Discharge 7.475" 7.525" (Between Centers of Holes) .750 /.760 Diameter "" 9.38" (4 Holes) Side View FIGURE 5-22 Tecumseh Reciprocating Compressor SRM-HW/HWC 2/99 UNIT COMPONENTS Magic-Pak: HW/HWC Manufacturer: Copeland TABLE 5-8 Copeland Compressor Specifications Armstron...

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