Reznor CAUA Unit Installation Manual Bedienungsanleitung PDF herunterladen (Seite 31)

Form I-CAUA, P/N 164771 R8, Page 31

6.6 Cased Cooling

Coil, Model

ACUA, ACUB,

or ACUC or

Option C

This cased cooling coil is designed for use with the Model CAUA upow heater. It is

shipped separately for eld installation over the discharge opening of the heater. Before

installing, verify that the coil cabinet is the same size as the heater cabinet.

Follow the installation instructions shipped with the cooling coil (Installation Form

I-CAUA-CC), the wiring diagram, and the instructions provided by the condenser unit

manufacturer.

The cased cooling coil is for use with R-410A refrigerant and requires eld installation

of the shipped-loose thermostatic expansion valves and reducers (if required). (NOTE:

A coil installed prior to 12/09 most likely is charged with R22 refrigerant; check the rat-

ing plate. Due to higher pressures, do not use tools designed for R22 refrigerant with

R410A refrigerant.)

Depending on size and option selection, coils may have a single circuit (Sizes 060 and

072 only), have two 50/50 circuits, or have two circuits that are 1/3-2/3 designed to

match the Reznor

Model MASA condensing unit.

Heater Model CAUA

150 200 250 300 350 400

ACUA or Opt C ACUB or Opt C ACUC or Opt C

060 090 120

072 120 150

090 150 180

TABLE 23 - Heater/Coil

Cross-Reference by

Cabinet Size

Model ACUA ACUB ACUC

Size 60 72 90 90 120 150 120 150 180

Nominal Cooling Capacity (MBH) 60 72 90 90 120 150 120 150 180

Refrigerant Type R-410A. (NOTE: Prior to 12/09, refrigerant type may be R22.)

Thermostatic Expansion Valves Shipped loose for eld installation; see Form I-CAUA-CC.

Approximate Weight (lbs) 83 86 105 110 122 140 176 180 188

Face Area (sq ft) 7.79 7.79 9.38 14.04 11.67 13.7 17.13 15.38 17.13

Airow (cfm)

Low 1800 3000 4000

Nominal 2400 4000 5000

High 3000* 5000* 6000*

* Airow in excess of maximum values shown may result in blow-off of condensation.

TABLE 24 - Cased Cooling Coil Technical Data

Thermostatic

Expansion Valves

Verify the thermostatic expansion valves and reducers shipped with the coil with the

appropriate list in Form I-CAUA-CC. Follow the instructions provided to install the ther-

mostatic expansion valve(s) and reducer(s), if required.

CAUTION: The thermostatic expansion valve must be for the

right refrigerant and must be sized to match the circuit. Failure

to properly select and install the thermostatic expansion valve

will prevent the system from operating properly and will void the

manufacturer’s warranty.

After the refrigerant lines are installed and before charging, extend the thermostatic

expansion valve bulb from the valve to the suction line. If there are two circuits, be sure

to match the liquid line with the corresponding suction line. Comply with the valve man-

ufacturer’s instructions on bulb placement. General recommendations are listed below.

• Place bulb on suction line as close to the evaporator coil outlet as possible.

• Place the bulb on a straight horizontal section of suction line (if bulb must be

vertical, line must be descending).

• Never place bulb in a trap or downstream of a trap.

• Position bulb as shown in FIGURE 25A.

• Bulb must have 100% contact with tubing.

• Secure the bulb tightly.

• Cover bulb with waterproof insulation.

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