93
JOHNSON CONTROLS
FORM 100.50-EG12 (918)
Factory Test:
The refrigerant circuit shall be pressure-tested, evacuated and fully charged
with refrigerant and oil. The completed refrigerant circuit shall undergo a factory helium
leak test and undergo an automated operational run test and quality inspection prior to
shipment. The unit controller shall be configured and run tested at the factory to minimize
field setup time. If the unit is not configured and tested, then the manufacturer shall pro-
vide field start up and testing to ensure that the controller is functioning properly.
Unit Construction
Base Rail:
The unit shall include an integral design base rail with lifting points clearly
marked and visible on the base rail and a 1-1/4
-
inch FPT connection for condensate
drainage. The unit base shall be designed with a recessed curb mounting location. The
recessed curb-mounting surface shall provide a continuous surface for field application of
curb gasketing to create a weather tight seal between the curb and unit.
Casing:
Casing shall be complete post and panel construction with exterior skin. All pan-
els, doors, walls, uprights, floor panels and roofing shall be one-inch thick; 1-1/2 pound
density insulation. Units are specifically designed for outdoor installation.
Roof:
The unit roof shall be bowed with the peak in the middle of the unit and sloped
to both sides of the unit for drainage. A drip lip shall run the length of the unit to prevent
water drainage down the side of the unit. Roof and sidewall seams shall be continuously
caulked and covered with formed galvanized seam caps. All panel fasteners shall be se-
cured through standing seams to prevent fastener penetrations that are exposed to the
air stream.
Paint:
Exterior painted surfaces are designed to withstand a minimum of 1,000 salt spray
hours when tested in accordance with ASTM B-117.
Markings and Diagrams:
All necessary tags and decals to aid in the service and/or indi-
cating caution areas shall be provided. Electrical wiring diagrams shall be attached to the
control panel access door.
Documentation:
Installation and maintenance manuals shall be supplied with each unit.
Access Doors:
Double wall access doors shall be provided in the fan, coil, filter and inlet
sections of the unit on both sides of the unit. Doors shall be double-wall construction with
a solid liner and a minimum thickness of 1-inch. Doors shall be attached to the unit with
piano-type stainless steel hinges. Latches shall be positive-action, creating an airtight
seal between the door and unit. Panels and doors shall be completely gasketed with
a closed-cell, neoprene gasket. Door tiebacks shall be provided for all doors to secure
doors while servicing.
Economizer Type
Select None or One of the Following
1.
No Outside Air:
the unit has no provisions for outside ventilation air.
2.
Manual Outside Air Damper:
A manually adjustable outside air damper capable of
admitting 0–25% outside air shall be provided.
3.
Two-Position Outside Air Damper:
A two position damper outside air damper ca-
pable of admitting 0–25% outside air shall be provided. The minimum position shall
be manually adjustable from 0–25%. Control shall be based on the occupied mode
of the unit. For occupied mode, the damper shall be open to the minimum position
and for unoccupied, it shall be closed.
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