installation, start-up and
service instructions | 548D |
Sizes | |
SINGLE PACKAGE ROOFTOP | 71/2 to 10 Tons |
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CONTENTS
Page
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1
I. Step 1— Provide Unit Support . . . . . . . . . . . . . . . . . 1
II. Step 2 — Field Fabricate Ductwork . . . . . . . . . . . . . 3
III. Step 3 — Install Condensate Drain Line
and External Trap. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 IV. Step 4 — Rig and Place Unit. . . . . . . . . . . . . . . . . . . 3 V. Step 5 — Make Electrical Connections . . . . . . . . . . 7 VI. Step 6 — Adjust
I. Unit Preparation. . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
II.
III.
IV. Compressor Mounting. . . . . . . . . . . . . . . . . . . . . . . 28
V. Internal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
VI. Refrigerant Service Ports . . . . . . . . . . . . . . . . . . . . 28
VII. High Flow Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
VIII. Compressor Rotation . . . . . . . . . . . . . . . . . . . . . . . 28
IX. Adjust Gas Input . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
X. Cooling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
XI. Heating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
XII. Safety Relief . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
XIII. Ventilation (Continuous Fan) . . . . . . . . . . . . . . . . . 29
XIV. Operating Sequence . . . . . . . . . . . . . . . . . . . . . . . . 29
I. Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
II. Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
III. Outdoor Fan Adjustment. . . . . . . . . . . . . . . . . . . . . 32
IV. Economizer Adjustment . . . . . . . . . . . . . . . . . . . . . 32
V. Refrigerant Charge . . . . . . . . . . . . . . . . . . . . . . . . . 32
SAFETY CONSIDERATIONS
Installation and servicing of
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
Cancels: II | II |
| 10/15/00 |
Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire ex- tinguisher available for all brazing operations.
WARNING: Before performing service or mainte- nance operations on unit, turn off main power switch to unit and tag disconnect with lockout tag. Electrical shock could cause personal injury.
INSTALLATION
Unit is shipped in the vertical configuration. To convert to horizontal configuration, remove side duct opening covers.
Using the same screws, install covers on vertical duct open- ings with the
I. STEP 1 — PROVIDE UNIT SUPPORT
A. Roof Curb
Assemble and install accessory roof curb in accordance with instructions shipped with curb. See Fig. 1. Install insulation, cant strips, roofing felt, and counter flashing as shown. Duct- work must be attached to curb. If electric or control power is to be routed through the basepan, attach the accessory thru-
IMPORTANT: The gasketing of the unit to the roof curb is critical for watertightness. Install gasket supplied with the roof curb as shown in Fig. 1. Improperly applied gasket can also result in air leaks and poor unit performance.
Curb should be level. Unit leveling tolerances are shown in Fig. 2. This is necessary for unit drain to function properly. 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 6 in. gravel apron in front of condenser coil air inlet to prevent grass and foliage from obstructing airflow.
NOTE: Horizontal units may be installed on a roof curb if required.
CAUTION: Ensure voltage listed on unit data plate agrees with electrical supply provided for the unit.