Unit Coolers
Condensate Drain Lines
Eithercopperorsteeldrainlinesshouldbeusedandproperlyprotected from freezing. In running drain lines, provide a minimum 1/4 inch per foot pitch for proper drainage. Drain lines should be at least as large as the evaporator drain connection. All plumbing connections should be made in accordance with local plumbing codes. All condensate drain lines must be trapped, and run to an open drain. They must never be connected directly to the sewer system. Traps in the drain line must be located in a warm ambient. We recommend a trap on each evaporator drain line prior to any tee connections. Traps located outside, or extensive outside runs of drain line must be wrapped with a drain line heater.The heater should be connected so that it operates continuously. It is recommended that the drain line be insulated to prevent heat loss. A heat input of 20 watts per linear foot of drain line for 0˚F
Inspect drain pan periodically to insure free drainage of condensate. If drain pan contains standing water, check for proper installation.The drain pan should be cleaned regularly with warm soapy water.
WARNING: All power must be disconnected before clean- ing. Drain pan also serves as cover of hazard- ous moving parts. Operation of unit without drain pan constitutes a hazard.
Traps on low temperature units must be outside of refrigerated enclosures. Traps subject to freezing temperatures must be wrapped with heat tape and insulated.
NOTE: Always trap single evaporator system drain lines individually to prevent humidity migration.
Figure 5. Condensate Drain Lines
DRAIN LINE
MIN.
PITCH 
1/4”/
VAPOR SEAL
TRAP
OPEN
DRAIN
Field Wiring
WARNING: All wiring must be done in accordance with applicable codes and local ordinances.
The field wiring should enter the areas as provided on the unit. The wiring diagram for each unit is located on the inside of the electrical panel door. All field wiring should be done in a professional manner and in accordance with all governing codes. Before operating unit, double check all wiring connections, including the factory terminals. Factory connections can vibrate loose during shipment.
1.The serial data tag on the unit is marked with the electrical characteristic for wiring the unit.
2.Consult the wiring diagram in the unit cooler and in the con- densing unit for proper connections.
3.Wire type should be of copper conductor only and of the proper size to handle the connected load.
4.The unit must be grounded.
5.For multiple evaporator systems, the defrost termination controls should be wired in series. Follow the wiring diagrams for multiple evaporator systems carefully. This will assure complete defrost of all evaporators in the system.
6.Multiple evaporator systems should operate off of one ther- mostat.
7.If a remote defrost timer is to be used, the timer should be located outside the refrigerated space.
Check Out and Start Up
NOTE: All adjustable controls and valves must be field adjusted to meet desired operation. There are no factory preset controls or valve adjustments. This includes low pressure, high pressure, adjustable head pressure systems and expansion valves.
After the installation has been completed, the following points should be covered before the system is placed in operation:
(a)Check all electrical and refrigerant connections. Be sure they are all tight.
(b)Check the room thermostat for normal operation and adjust.
(c)Wiring diagrams, instruction bulletins, etc. attached to the condensing units should be read and filed for future reference.
(d)All fan motors on evaporators should be checked for proper rotation. Fan motor mounts should be carefully checked for tightness and proper alignment.
(e)Electric and hot gas evaporator fan motors should be temporarily wired for continuous operation until the room temperature has stabilized.
(f)Do not leave unit unattended until the system has reached normal operating conditions and the oil charge has been properly adjusted to maintain the oil level between 1/4 and bottom of the sight glass.
(g)Make sure all Schrader valve caps are in place and tight.
