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System Design Summary
1. Intended for outdoor installation with free air inlet and outlet. Outdoor fan external static pressure available is less
than 0.01-in. wc.
2. Minimum outdoor operating air temperature without low-ambient operation accessory is 55°F (12.8°C).
3. Maximum outdoor operating air temperature is 125°F (51.7°C).
4. For reliable operation, unit should be level in all horizontal planes.
5. Maximum elevation of indoor coil above or below base of outdoor unit is: indoor coil above = 50 ft (15.24m), indoor
coil below = 150 ft (45.72m).
6. For interconnecting refrigerant tube lengths between 50 (15.24m) and 175 (53.34m) ft and/or 20 (6.1m) ft vertical dif-
ferential, consult Residential’s Split System Long-Line Application Guideline available from equipment distributor.
7. Crankcase heater required when interconnecting refrigerant tube length exceeds 50 ft (15.24m).
8. If any refrigerant tubing is buried, provide a minimum 6 in. (152mm) vertical rise to the valve connections at the
unit. Refrigerant tubing lengths up to 36 in. (912mm) may be buried without further consideration. For buried lines
longer than 3 ft (912mm), consult your local distributor.
9. Use only copper wire for electric connection at unit. Aluminum and clad aluminum are not acceptable for the type of
connector provided.
Summary of Contents for 38CKS
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