Carrier WEATHERMAKER 48AJ- Manuals

18 Table 6 — Evaporator Fan Motor Data NOTES: 1. Motor shaft speed is 1750 rpm. The fan shaft diameter is 1 15 / 16 inches. 2. All indoor fan motors meet the minimum efficiency requirements as established by the Energy Policy Act of 1992 (EPACT), effectiveOctober 24, 1997. UNIT SIZE 48AJ,AK, AW,AY M...

19 Step 5 — Install Flue Hood 48AJ,AK,AW,AY020-050 UNITS — Flue hood is shipped inside gas section of unit. To install, secure flue hood to access panel. See Fig. 14.48AJ,AK,AW,AY051 AND 060 UNITS — Flue hood and wind baffle are shipped inside gas section of unit. To install, se- cure flue hood to a...

20 Size gas-supply piping for 0.5-in. wg maximum pressure drop. Do not use supply pipe smaller than unit gas connection.OPTIONAL STAGED GAS UNITS — See Table 7 for staged gas information. Staging pattern is selected during controls start-up. For complete information and service instructions for Stag...

29 Routing Through Bottom of Unit — If wiring is brought in through bottom of unit, use field-supplied watertight conduit to route power wiring through the 3 1 / 2 -in. diameter hole provided in the unit basepan. Install conduit connector in unit basepan as shown in Fig. 4-9. Route power and ground ...

30 Staged Gas Control Option Thermistors — If the unit is equipped with the staged gas heat option, supply-air ther- mistors must be installed. Three supply-air thermistors are shipped with staged gas units and are inside the heating sec- tion. The supply-air thermistors should be located in the sup...

32 Step 9 — Make Outdoor-Air Inlet Adjustments ECONOMIZER AND FIXED OUTDOOR AIR DAMPER — Hoods are used on all units with economizer or adjustable self-closing fixed outdoor air damper.NOTE: If accessory power exhaust or barometric relief pack- ages are being added to the unit, install power exhaust...

33 Step 10 — Position Power Exhaust/BarometricRelief Damper Hood — All units are shipped with the hoods folded inside the unit in a shipping position. For 48AJ, and AK units the hood must be tilted out once the unit is in- stalled. On 48AW, AY units, (designed for horizontal supply and return) the a...

34 Step 11 — Route VAV Static Pressure Sensors VAV DUCT PRESSURE TRANSDUCER — The VAV duct pressure transducer (VAV inverter pressure transducer) is locat- ed behind the filter access door on the lower inner panel. See Fig. 33. A section of field-supplied 1 / 4 -in. plastic tubing must be run from t...

35 building, route the high tap to atmosphere and the low tap to building air. Step 12 — Install All Accessories — After all the factory-installed options have been adjusted, install all field- installed accessories. Refer to the accessory installation instruc- tions included with each accessory. Th...

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480067-01 Printed in U.S.A. Form 48A-7SI Pg 36 8-09 Replaces: 48A-5SI Copyright 2009 Carrier Corporation 3 1.25 ” IN S IDE RA 97.7 8” (0...