Theinstallationmustcomplywithregulationsoftheservinggassupplier, localbuilding, heating, plumbing, andothercodes. Inabsenceoflocalcodes, theinstallationmustcomplywithnationalcodesandallauthoritieshavingjurisdiction. B24.25” .56” .56” 20” 3” 23.8” .56” CombustionAirInlet2” DiameterVentConnectionOutletBDURINGINSTALLATION, DOORSMUSTREMAINONFURNACEWHENMOVINGORLIFTING. VentConnectionOutlet † Other airflows are available. see Tech Guide for all CFM options. * Cool Tap. ** Adjustment Tap. LED INDICATOR

If the furnace is equipped with NOx screens and is to be 7. To measure total static pressure, add supply duct pressure detailed information. used with LP (propane) gas, the screens must be removed to the return duct pressure, add pressure drop across the ‘A’ prior to start-up. coil, and add pressure drop across the filter. Ignore negative 2. Drip leg in the gas line must be installed. signs on the readings. 3. The furnace controls require correct polarity on the power 8. Inlet gas pressure shoul

The equivalent length of the vent system is the total length of straight pipe PLUS the equivalent length of all of the elbows. The following rules must also be followed: 1. Long radius (sweep) elbows are recommended. Standard elbows may be used, but since they have a longer equivalent length, they will reduce the total length of pipe that will be allowed. Short radius (plumbing vent) elbows are not allowed. The standard dimensions of the acceptable elbows are shown below. 2. The maximum equiv

. .24 Double Vertical Combustion Air Intake and Vent Termination .....24 Direct Vent Air Intake Connection and Vent Connection .........25 Combustion Airflow Path Through The Furnace Casing .........25 Outside and Ambient Combustion Air........................26 Attic and Crawl Space Combustion Air Termination .............27 Gas Valve.............................................30 Reading Gas Pressure...................................30 Furnace Control Board............................

ID MODELS LO COMP Single Stage Compressor (OUT) O Reversing Valve Energized in Cool HI COMP Second Stage Compressor (OUT) TWO STAGE AIR CONDITIONER C 24 – Volt Common R 24 – Volt Hot Y1 First Stage Compressor Y2 Second Stage Compressor External Humidistat (Optional) Open on Humidity Rise 2 Part Number: S1-2HU16700124 2 TP(8,L)C YP(8,L)C CP(8,L)C LP(8,L)C FIGURE 21: Thermostat Chart - Two Stage Air Conditioner with Single Stage Thermostat – Variable Speed or PSC Modulating Furnace Johnson Control

LO COMP Single Stage Compressor (OUT) O Reversing Valve Energized in Cool HI COMP Second Stage Compressor (OUT) Change Hot Heat Pump jumper on the heat pump control to “ON” if Hot Heat Pump Operation is desired. External Humidistat (Optional) Open on Humidity Rise 3 ID MODELS TM(8,L)M YM(8,L)M CM(8,L)M LM(8,L)M FIGURE 25: Thermostat Chart - Two Stage Heat Pump – Variable Speed or PSC Modulating Furnace Johnson Controls Unitary Products 368261-UIM-A-0508 18 Johnson Controls Unitary Products ACCES

FIGURE 11: Typical Suspended Furnace / Crawl Space Installation For modulating furnaces to be used in the downflow position, it is necessary to rotate the gas valve so that it is upright when the furnace is installed. Loosen the pipe union between the gas valve and manifold, rotate the valve as far upward as it will go, and tighten the union. See Figure 13, "Downflow Installation - Gas Valve Rotation". Angle Iron Bracket 6” Min. Between Rod & Front of Furnace 1” Max. Between Rod & Back of Furnac

Slow Amber Flash - Normal operation with call for cooling. Two Amber Flashes - Normal operation with call for heat. Three Amber Flashes - Normal operation, burner is on at end of thermostat cycle. Six Amber Flashes - Normal operation with call for heat pump heating. Any Red Flash - Fault condition. NOTE: 4 or 5 flashes may indi cate a blown fuse on the circuit board. Application Upflow Downflow Horizontal Top 1" 0" 0" Vent 0" 0" 0" Rear 0" 0" 0" Side 0" 0" 1" Front* 0" 0" 0" Floor Combustible Co

Slow Amber Flash - Normal operation with call for cooling. Two Amber Flashes - Normal operation with call for heat. Three Amber Flashes - Normal operation, burner is on at end of thermostat cycle. Six Amber Flashes - Normal operation with call for heat pump heating. Any Red Flash - Fault condition. NOTE: 4 or 5 flashes may indi cate a blown fuse on the circuit board. Application Upflow Downflow Horizontal Top 1" 0" 0" Vent 0" 0" 0" Rear 0" 0" 0" Side 0" 0" 1" Front* 0" 0" 0" Floor Combustible Co

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 START-UP AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . 22 DUCTWORK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 SAFETY CONTROLS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 FILTERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 NORMAL OPERATION AND DIAGNOSTICS . . . . . . . . . . . . . 29 GAS PIPING . . .