II. RIG AND MOUNT UNIT
A. Mounting on Ground
Mount unit on a solid, level concrete pad. Position unit so water or ice from roof does not fall directly into unit. Field- fabricated stacking kits can be used when units are to be stacked. If conditions or local codes require unit to be fas- tened to a pad, 6
B. Mounting on Roof
Mount unit on level platform or frame at least 6 in. above roof surface. Isolate unit and tubing from structure.
C.Rigging
CAUTION: Be sure unit panels are securely in place prior to rigging.
Keep unit upright. Lift unit using sling. Use cardboard or padding under sling, and spreader bars to prevent sling damage to unit. See Fig. 3. See Fig. 2 for center of gravity ref- erence. Install unit so coil does not face into prevailing winds. If this is not possible and constant winds above 25 mph are expected, use
NOTE: Accessory wind baffles should be used on all units with accessory
III. COMPLETE REFRIGERATION PIPING CONNECTIONS
Outdoor units may be connected to indoor units using field- supplied tubing of refrigerant grade and condition. See Tables 1A and 1B for correct line sizes. Do not use less than 10 ft (3 m) of interconnecting tubing.
CAUTION: DO NOT BURY MORE THAN 36 IN. (922 mm) OF REFRIGERANT PIPE IN THE GROUND. If any section of pipe is buried, there must be a 6 in. (154 m) vertical rise to the valve connections on the outdoor unit. If more than the recommended length is buried, refrigerant may migrate to the cooler, buried section during extended periods of system shut- down. This causes refrigerant slugging and could dam- age compressor at
When more than 50 ft (15.2 m) of interconnecting tubing and more than 30 ft (9.1 m) of vertical lift is used, refer to Part 3 of the System Design Manual for design details, or contact your local distributor.
If either refrigerant tubing or indoor coil is exposed to atmo- spheric conditions for longer than 5 minutes, it must be evac- uated to 1000 microns to eliminate contamination and moisture in the system.
Run refrigerant tubes as directly as possible, avoiding unnecessary turns and bends. Suspend refrigerant tubes so they do not damage insulation on vapor tube and do not transmit vibration to the structure. Also, when passing refrigerant tubes through the wall, seal opening so that vibration is not transmitted to structure. Leave some slack in refrigerant tubes between structure and outdoor unit to absorb vibration. Refer to separate indoor unit installation instructions for additional information.
Fig. 3 — Lifting Unit with Sling
A. Check AccuRater® Control
The AccuRater refrigerant control is required for cooling sys- tem capacity optimization. An AccuRater device with field- replaceable piston should be supplied with the indoor unit. Refer to AccuRater metering device table in separate indoor unit installation instructions to determine the correct Accu- Rater piston size required for the condenser/evaporator sys- tem being installed.
Note that one of 2 types of the AccuRater devices can be used. Use Type A only if Type B is unavailable. See Fig. 4. Do not interchange components between AccuRater device types. Matching of outdoor unit with indoor unit may require field replacement of piston. Replace piston, if required, before connecting refrigerant lines. Piston replacement instructions are included in the indoor unit installation instructions. After system installation is complete, see Refrigerant Charging section on page 8 to check and/or adjust refrigerant charge.
The 538J series units may also be installed with units using a thermostatic expansion valve (TXV). If a TXV is used, be sure to remove the piston from the indoor coil. See installa- tion instructions shipped with the TXV for proper position- ing and adjustment.
TYPE A
TYPE B (RECOMMENDED)
NOTE: Arrow on AccuRater body points in
