Assessments - 3, GPA: 4.7
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Refer to the installation instruction (Form 035-15410-002) for the matching outdoor unit for piping limitations, line sizes, and other design considerations. INSTALLING REFRIGERANT MAINS WARNING: Provisions for recovering refrigerant releases must be available during all phases of installation, leak testing and charging. Do NOT release refrigerant into the atmosphere. The units are evacuated and dehydrated at the factory and shipped with a holding charge of an inert gas such as Nitrogen or Helium. The vapor and liquid connections are sealed with copper discs. If the unit has already lost its holding charge, it should be leak tested and the necessary repairs should be made. If the unit has maintained its holding charge, you can assume that it has no leaks and proceed with the installation. The temperature required to make or break a brazed joint is sufficiently high to cause oxidation of the copper unless an inert atmosphere is provided. Drill a small hole through the discs to prevent any internal pressure from blowing them off and to allow the flow of dry nitrogen through the connections when unbrazing the closures. The liquid and vapor connections must be piped outside the unit. Refer to the unit drawing for the locations and the dimensions of these connections. Before brazing the refrigerant lines to these connections, remove the short panel from the unit frame and slide the grommets onto the refrigerant lines. After the brazed joints have cooled, slide the grommets back into place and secure the panel to the unit frame. NOTE: These coils can only be piped from one side of the unit. DRAIN CONNECTION The drain line MUST be trapped because the coil is located on the negative side of the supply air blower, and it must be protected from freezing temperatures. FIG. 7 - RECOMMENDED DRAIN PIPING Unitary Products Group 035-09651-001-A-0304 A 7/8" OD drain connection extends through right hand side of cabinet. Refer to Fig. 7 for recommended drain piping. The drain connection is located on the same side of the unit as the refrigerant connections. The line should be insulated where moisture drippage will be objectionable or cause damage to the area. The 3" dimension must equal or exceed the negative static pressure developed by the supply air blower. If it does not, the condensate will not drain properly and may overflow the drain pan. The trap must be at least 2-1/2" deep to maintain a water seal under all operating conditions, especially during blower start-up. NOTE: The unit may have to be raised off the floor to allow enough height for the trap. TABLE 3 - SUPPLY AIR BLOWER MOTOR PULLEY ADJUSTMENT TURNS OPEN* MODEL F3EH090 60 Hz F3EH090 50 Hz F4EH120 60 Hz F4EH120 50 Hz 5 655 RPM 542 RPM 700RPM 581 RPM 4 760 580 750 622 3 745 618 800 663 2 790 656 850 704 1 835 694 900 745 0 880 732 950 786 *Pulleys can be adjusted in half-turn increments. SUPPLY AIR BLOWER ADJUSTMENT The RPM of the supply air blower will depend on the required CFM, the unit accessories and the static resistances of both the supply and the return air duct systems. With this information, the RPM for the supply air blower can be determined from the blower performance in Table 4. Knowing the required blower RPM and the blower motor HP, the setting (turns open) for the supply air motor pulley can be determined from Table 3. Each motor pulley has: 1. A threaded barrel with two flats (or notched recesses) 180 degrees apart. 2. A movable flange with one set screw. After the movable flange has been rotated to the proper number of “turns open”, the set screw should be tightened against the flat on the barrel to lock the movable flange in place. If the pulley includes a locking collar, the locking collar must be loosened to adjust the setting of the movable flange. Note the following: 1. The supply air CFM must be within the limitations shown in Table 2. 2. All pulleys can be adjusted in half turn increments. 3. The tension on the belt should be adjusted for a deflection of 3/16 of an inch per foot of belt span with an applied force of 2 to 3 pounds. This adjustment is made by moving the blower motor mounting plate. Refer to Figure 8. Turning the adjustment bolt (B) moves the motor mounting plate up or down. FIG. 8 - TYPICAL MOTOR MOUNTING ASSEMBLY NOTE: Never loosen the two nuts (C). Two hex nuts (A) have to be loosened to move the mounting plate and retightened after the mounting plate has been moved to the proper position. 4. All pulleys are factory aligned. 5. All supply air motor pulleys are factory set 3 “turns open”. After the supply air blower motor is operating, adjust the resistances in both the supply and the return duct systems to balance the air distribution throughout the conditioned space. The job specifications may require that this balancing be done by someone other than the equipment installer. To check the supply air CFM after the initial balancing has been completed: 1. Drill two 5/16 inch holes in the side panel as shown in Figure 9. ...