Bryant 581B installation instructions Contents, Safety Considerations, Installation

installation, start-up and		581B
service instructions
	DuraPac Plus Series

SINGLE PACKAGE ROOFTOP

GAS HEATING/ELECTRIC COOLING UNITS

Sizes 036-072 3 to 6 Tons

Cancels: II 581B-36-6	II 581B-36-7
	10/1/05

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33 I. Step 1 — Provide Unit Support. . . . . . . . . . . . . . . . . 1 II. Step 2 — Field Fabricate Ductwork . . . . . . . . . . . . . 2

III. Step 3 — Determine Location of Drain Line

and External Trap. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 IV. Step 4 — Rig and Place Unit. . . . . . . . . . . . . . . . . . . 4 V. Step 5 — Install Flue Hood . . . . . . . . . . . . . . . . . . . . 4 VI. Step 6 — Install Gas Piping . . . . . . . . . . . . . . . . . . . 4 VII. Step 7 — Make Electrical Connections . . . . . . . . . . 9 VIII. Step 8 — Adjust Factory-Installed Options . . . . . . 13 IX. Step 9 — Adjust Evaporator-Fan Speed . . . . . . . . 22

PRE-START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34-37

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38-44

TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . .45-49

INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . . . . . . CL-1

SAFETY CONSIDERATIONS

Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical compo- nents. Only trained and qualified service personnel should install, repair, or service air-conditioning equipment.

Untrained personnel can perform basic maintenance func- tions of cleaning coils and filters and replacing filters. All other operations should be performed by trained service per- sonnel. When working on air-conditioning equipment, observe precautions in the literature, tags and labels attached to the unit, and other safety precautions that may apply.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguishers available for all brazing operations.

CAUTION: Ensure voltage listed on unit data plate agrees with electrical supply provided for the unit.

WARNING: Disconnect gas piping from unit when leak testing at pressure greater than 1/2 psig. Pressures greater than 1/2 psig will cause gas valve damage result- ing in hazardous condition. If gas valve is subjected to pressure greater than 1/2 psig, it must be replaced before use. When pressure testing field-supplied gas piping at pressures of 1/2 psig or less, a unit connected to such piping must be isolated by manually closing the gas valve(s).

WARNING: Before performing service or mainte- nance operations on unit, turn off main power switch to unit. Electrical shock could cause personal injury.

INSTALLATION

Unit is shipped in the vertical configuration. To convert to horizontal application, remove side duct opening covers. Using the same screws, install covers on vertical duct open- ings with the insulation-side down. Seals around duct open- ings must be tight. See Fig. 1.

I. STEP 1 — PROVIDE UNIT SUPPORT

A. Roof Curb

Assemble and install accessory roof curb in accordance with instructions shipped with curb. See Fig. 2. Install insulation, cant strips, roofing felt, and counter flashing as shown. Duct- work must be attached to curb. If gas is to be routed through the curb, attach the accessory thru-the-curb service connec- tion plate to the roof curb in accordance with the accessory installation instructions. Connection plate must be installed before unit is set in roof curb.

IMPORTANT: The gasketing of the unit to the roof curb is crit- ical for a watertight seal. Install gasket supplied with the roof curb as shown in Fig. 2. Improperly applied gasket can also result in air or water leaks and poor unit performance.

Curb should be level. This is necessary for unit drain to func- tion properly. Unit leveling tolerances are shown in Fig. 3. Refer to Accessory Roof Curb Installation Instructions for additional information as required.

B. Slab Mount (Horizontal Units Only)

Provide a level concrete slab that extends a minimum of 6 in. beyond unit cabinet. Install a gravel apron in front of con- denser coil air inlet to prevent grass and foliage from obstructing airflow.

NOTE: Horizontal units may be installed on a roof curb if required.

C. Alternate Unit Support

A non-combustible sleeper rail can be used in the unit curb support area. If sleeper rails cannot be used, support the long sides of the unit with a minimum of 3 equally spaced 4-in. x 4-in. pads on each side.