Heatcraft Mohave, Installation & Operation Manual, Page: 9 / 76

9
One evaporator
Unit Coolers (continued)
Recommended Unit Cooler Placement
Some general rules for evaporator placement which must be followed are:
1. The air pattern must cover the entire room
2.
NEVER
locate evaporators over doors
3. Location of aisles, racks, etc. must be known
4. Location relative to compressors for minimum pipe runs
5. Location of condensate drains for minimum run.
The size and shape of the storage will generally determine the type and number of
evaporators to be used and their location. The following are some typical examples:
Minimum Unit Clearances
Figure 2. Medium Profile and Large Unit Coolers
NOTE:
W = Total width
of evaporator
coil surface.
Two evaporators
Unit Cooler Installation & Condensate Lines
WARNING: All power must be disconnected before cleaning.
Drain pan also serves as cover of hazardous moving
parts. Operation of unit without drain pan constitutes
a hazard.
Condensate Drain Lines
Either copper or steel drain lines should be used and properly protected from
freezing. In running drain lines, provide a minimum 4 inches 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
(-18˚C) room applications and 30 watts per linear foot for -20˚F (-29˚C) rooms is
satisfactory. In freezers, the evaporator drain pan fitting should be included when
heating and insulating the drain line.
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.
Condensate Drain Lines
NOTE: Always trap single evaporator system drain
lines individually to prevent humidity migration.
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: Leave space equal to unit height between bottom of unit and product.
Do not stack product in front of fans.
- 1/4” / FT