EVAPORATOR COIL (DX) INSTALLATION OPERATION AND MAINTENANCE Commercial Products PO Box 1457 / 1000 Heatcraft Drive, Grenada, MS 38902-1457 Tel: 800-225-4328 / 662-229-4000 Fax: 662-229-4212 Email: coils@heatcraft.com Web Site: www.heatcraft.
EVAPORATOR IOM Guidelines for the installation, operation and maintenance of Heatcraft’s direct expansion (DX) cooling coils have been provided to help insure proper performance of the coils and their longevity. These are general guidelines that may have to be tailored to meet the specific requirements of any one job. As always, a qualified party or individual should perform the installation and maintenance of any coil.
EVAPORATOR IOM EN NORMAL Rows 2,3,4,5 6,8,10,12 EF FACE CONTROL Rows 2,3,4,5 6,8,10,12 EJ INTERLACED Rows 3,4,6,8,10,12 2 Distributors ER ROW CONTROL 6 Row EK INTERLACED Face Control Rows 4,6,8,10,12 4 Distributors Figure 1 - Evaporator Coils Coil Types 1. Heatcraft’s model EN evaporator is used for applications where capacity control is not required. Single or multiple distributors are available depending on the number of circuits required.
EVAPORATOR IOM Installation 1. Carefully remove the coil from the shipping package to avoid damage to the finned area. Damaged fins can be straightened using an appropriate fin comb. 2. Heatcraft recommends cleaning the coil with a commercially available coil cleaner prior to installation. Refer to Maintenance on Page 6 for cleaning recommendations. 3. Proper clearance should be maintained between the coil and other structures such as the fan, filter racks, transition areas, etc. 4.
EVAPORATOR IOM 12. Use a vacuum pump to evacuate the coil and any interconnecting piping that has been open to atmosphere. Measure the vacuum in the piping using a micron gauge located as far from the pump as possible (the vacuum at the pump will be greater than the rest of the system). Evacuate the coil to 500 microns or less then close the valve between the pump and the system.
EVAPORATOR IOM Distributor Liquid Line Suction Header Coil Equalizer Line Nozzle Expansion Valve Hot Gas By-Pass Hot Gas Side Port Suction Line Remote Sensing Bulb Straps Suction Connection Figure 4 - Hot Gas Bypass Kit Installed Suction Header Distributor Coil Equalizer Line Liquid Line Nozzle Expansion Valve Suction Line Straps Remote Sensing Bulb Figure 5 - General Diagram 5 Suction Connection
EVAPORATOR IOM Operation 1. Proper air distribution is vital to coil performance. Air flow anywhere on the coil face should not vary by more than 20%. 2. Air velocities should be maintained between 200 and 550 feet per minute. 3. The drain pan should be designed and installed such that there is no standing water. Maintenance 1. Filters should be inspected on a regular basis and changed as needed. Maintaining clean filters is a cost-effective way to help maintain maximum coil performance and service life.
Commercial Products WARRANTY The Heat Transfer Division of Heatcraft Inc., hereinafter referred to as the “Company”, warrants that it will provide free suitable repair or replacement of coils in the event any coil of its manufacture used in the United States proves defective in material or workmanship within twelve (12) months from the date shipped by the Company. THIS WARRANTY CONSTITUTES THE BUYER’S SOLE REMEDY. IT IS GIVEN IN LIEU OF ALL OTHER WARRANTIES.