25
System Design
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 for cooling mode without low-ambient operation accessory is 55°F (12.8°C).
3. Maximum outdoor operating air temperature for cooling mode is 125°F (51.7°C).
4. Minimum outdoor operating air temperature for heating mode is –30°F (–34.4°C).
5. Maximum outdoor operating air temperature for heating mode is 66°F (18.9°C).
6. For reliable operation, unit should be level in all horizontal planes.
7. Maximum elevation of indoor coil above or below base of outdoor unit is: indoor coil above = 50 ft/indoor coil below = 150 ft (see items 8 and 9 following).
8. For interconnecting refrigerant tube lengths greater than 50 ft and/or elevation differences between indoor and outdoor units greater than 20 ft, consult Residential Split-
System Application Guideline and Service Manual for Air Conditioners and Heat Pumps using Puron refrigerant.
9. If ANY refrigerant tubing is buried, provide a minimum 6-in. vertical rise to the valve connections at the unit. Refrigerant tubing lengths up to 36 in. may be buried without
further considerations. Buried refrigerant tubing lengths greater than 36 in. are not recommended.
10. Use only copper wire for electric connection at unit. Aluminum and clad aluminum are not acceptable for the type of connector provided.
11. Mixmatches of indoor coil capacity more than 1 size larger than outdoor unit capacity (unless so specified) may result in inadequate indoor comfort.
12. Do not apply capillary tube indoor coils to these units.
13. Factory-supplied filter drier must be installed.
