installation, start-up and service instructions
551A
DuraPac Plus Series
SINGLE PACKAGE ROOFTOPSizes
ELECTRIC COOLING/ELECTRIC HEATING UNITS
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SAFETY CONSIDERATIONS | . . 1 | |
INSTALLATION | ||
I. Step 1 — Provide Unit Support | . . 1 | |
II. Step 2 — Rig and Place Unit | . . 1 | |
III. Step 3 — Field Fabricate Ductwork | . . 7 | |
IV. Step 4 — Make Unit Duct Connections | . . .7 | |
V. Step 5 — Trap Condensate Drain | . . 7 | |
VI. Step 6 | — Make Electrical Connections | . . . 8 |
VII. Step 7 | — Make |
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Adjustments | . 11 | |
VIII. Step 8 | — Install | . 12 |
IX. Step 9 | — Install All Accessories | . 15 |
X. Step 10 — Install Humidistat for Optional |
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Perfect Humidity™ Dehumidification Package . | . 16 | |
TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . 33,34
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
Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguishers available for all brazing operations.
Cancels: II | II |
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INSTALLATION
I. STEP 1 — PROVIDE UNIT SUPPORT
A. Roof Curb
Assemble and install accessory roof curb or horizontal supply roof curb in accordance with instructions shipped with the accessory. Accessory roof curb and horizontal supply roof curb and information required to field fabricate a roof curb or horizontal supply roof curb are shown in Fig. 1 and 2. Install insulation, cant strips, roofing, and counter flashing as shown. Ductwork can be secured to roof curb before unit is set in place.
IMPORTANT: The gasketing of the unit to the roof curb or horizontal supply roof curb is critical for a leakproof seal. Install gasket supplied with the roof curb or horizontal sup- ply roof curb as shown in Fig. 1. Improperly applied gasket can result in air leaks and poor unit performance.
Roof curb must be level. This is necessary to permit unit drain to function properly. Unit leveling tolerance is ± 1/16 in. per linear ft in any direction. Refer to Accessory Roof Curb or Horizontal Supply Roof Curb Installation Instructions for additional information as required.
B. Alternate Unit Support
When the curb or adapter cannot be used, support unit with sleepers using unit curb or adapter support area. If sleepers cannot be used, support long sides of unit with a minimum of 3 equally spaced
II. STEP 2 — RIG AND PLACE UNIT
Inspect unit for transportation damage. File any claim with transportation agency. Keep unit upright, and do not drop. Use spreader bars over unit to prevent sling or cable dam- age. Rollers may be used to move unit across a roof. Level by using unit frame as a reference; leveling tolerance is
±1/16 in. per linear ft in any direction. See Fig. 3 for addi- tional information. Unit weight is shown in Table 1.
Four lifting holes are provided in ends of unit base rails as shown in Fig. 3. Refer to rigging instructions on unit.
WARNING: Before performing service or mainte- nance operations on unit, turn off main power switch to unit. Electrical shock could cause personal injury.
IMPORTANT: Units have high ambient operating limits. If limits are exceeded, the unit will automatically lock the com- pressor out of operation. Manual reset will be required to restart the compressor.
A. Positioning
Provide clearance around and above unit for airflow, safety, and service access (Fig. 4 and 5).
Do not install unit in an indoor location. Do not locate air inlets near exhaust vents or other sources of contaminated air.
Although unit is weatherproof, guard against water from higher level runoff and overhangs.
B. Roof Mount
Check building codes for weight distribution requirements.