consideration is given the weather-tight integrity of the roof. The condensing unit contains moving components and can vibrate; therefore, sound is also a consideration in rooftop application. Since this unit discharges warm condenser air from the top with cooler air being drawn in three sides, plantings can be made in relatively close proximity to the unit. Owners should be advised to avoid lawn mower discharge toward the unit depositing debris on the fan coil surface reducing product efficiency.
ELECTRICAL
Electrical installation will consist of power supply wiring to the condensing unit as well as control wiring between thermostat, indoor unit and the condensing unit as shown on wiring diagram. All wiring must be in accordance with National Electrical Code and/or local codes that may apply.
The condensing unit rating plate and the table inside the front cover of this instruction lists pertinent electrical data necessary for the selection of proper size electrical service and over-current protection. The owner should be made familiar with the location of the over-current protection, the proper size for this application and the proper procedure for disconnecting power service to the unit.
The condensing unit control wiring requires a 24 Volt minimum 25 VA service from the indoor transformer as shown on the wiring diagram.
REFRIGERANT TUBING
Use only refrigerant grade (dehydrated and sealed) copper tubing of the size indicated in Table 1 to interconnect the condensing unit with the indoor evaporator. Take extreme care to keep the refrigerant tubing clean and dry prior to and during installation.
Do not remove plugs from ends of tubing until connection is ready to be made. Suction line insulation is necessary to prevent condensation from forming on and dropping from suction line. Generally 3/8" wall thickness of Armflex or equivalent is satisfactory. In severe application (hot, high humidity areas) greater thickness may be required. Apply suction line insulation by sliding it on the sealed tubing before cutting and making connections.
EVAPORATOR COILS
WARNING
USE EXTREME CARE IN REMOVING THE CAPS FROM THE SUCTION AND LIQUID LINE FITTINGS AS THERE IS PRESSURE PRESENT. A FITTING IS ON THE LIQUID LINE TO REMOVE PRESSURE.
WARNING
DO NOT REMOVE PROTECTIVE CAPS UNTIL INSTALLATION HAS BEEN COMPLETED AND FINAL CONNECTIONS ARE TO BE MADE.
Field Connection to the Valve and Valve Opening
1.Tubing should be cut square. Make sure it is round and free of burrs at the connecting ends. Clean the tubing to prevent contaminants from entering the system.
2.Wrap a wet rag around the copper valve stub before brazing.
3.Braze or silver solder the joint.
4.After brazing, quench with a wet rag to cool the joint. Evacuate and charge the connecting lines as outlined in these instructions.
5.Remove valve top cap. It is important to keep the cap in a clean area to assure proper sealing once replaced.
6.Using a standard L shaped Allen wrench, break open the valve body. To expedite opening the valve body after it is broken, use a ratchet wrench with a short Allen stub. Please note that it is normal to see oil on the valve stem body once the cap is removed.
7.Replace the valve cap and tighten with a wrench making sure that the the cap is sealed.
QUICK CONNECT COILS
Precharged System Installation
Installation procedure will differ when condensing units are provided for use with precharged refrigerant coils and lines. Condensing units are provided with #6 and #11 male quick connects instead of liquid and suction valves attached to cabinet to contain the R-22 charge that is sufficient for matching evaporator coils and 15’ of interconnecting lines.
Coils are provided with #6 and #11 male quick connects. Line sets are required with #6 and #11 female quick connects on both ends. Access ports are required in the fittings of both liquid and suction lines at condenser end. Both coil and line sets include R-22 holding charge only.
1.Connect lines to evaporator coil before connecting to the condensing unit locating access ports adjacent to condensing unit.
a.Form tubing so it properly aligns with the coil connections.
b.Remove plugs and caps from connections.
c.Check to be sure mating surfaces are clean.
d.Lubricate rubber seal with clean refrigerant oil and thread couplings together by hand to be sure they are not cross threaded.
e.Tighten connections using backup wrench on stationary fitting until coupling bottoms; then tighten 1/6 turn to complete knife edge seal.
2.Connect lines to condensing unit in the same manner as to evaporator coil. Observe same precautions.
3.After making all connections and opening valves, check all piping for leaks.
SYSTEM START UP
Processing Checks
Condensing units are supplied R-22 charge sufficient for typical matching evaporator and approximately 15’ of interconnecting tubing. Condensing unit liquid and suction valves are closed to contain the charge within the unit.
