Carnes EK Installation Manual
Installation and Maintenance Manual IM 902
McQuay Direct Expansion (DX) Cooling
Coils
Types EN, EF, ER, EJ, EK
Group: Applied Air
Part Number: IM 902
Date: February 2008
© 2008 McQuay International
Contents
Introduction .............................................................. 3
General Information................................................ 3
Hazard Identification Information............................ 3
Receiving Instructions ............................................ 3
Coil Types............................................................... 3
Model EN............................................................ 3
Model EF ............................................................ 3
Model ER............................................................ 3
Model EJ............................................................. 3
Model EK ............................................................ 3
Nomenclature......................................................... 4
Installation ................................................................ 5
Mounting ................................................................ 5
Installation.............................................................. 5
Operation and Maintenance.................................... 7
Operation ............................................................... 7
General .............................................................. 7
Maintenance .......................................................... 7
General .............................................................. 7
Introduction
Introduction
General Information
Guidelines for the installation, operation and maintenance of
McQuay 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, an experienced installation company or fully
trained individual should perform the installation and
maintenance of any coil. Protective equipment such as safety
glasses, steel toe boots and gloves are recommended during
the installation and routine maintenance of the coil.
Hazard Identification Information
DANGER
Dangers indicate a hazardous situation which will result in
death or serious injury if not avoided.
WARNING
Warnings indicate potentially hazardous situations, which can
result in property damage, severe personal injury, or death if
not avoided.
3 Damaged and/or missing items should be noted on the
carrier's freight bill and signed by the driver.
4 For additional assistance, contact your local McQuay sales
representative.
Coil Types
Model EN
This evaporator coil is used for applications where capacity
control is not required. Single or multiple distributors are
available depending on the number of circuits required. Model
EN (Figure 1) evaporators utilize dual suction connections
when multiple distributors are used.
Model EF
Face control (model EF - Figure 1) is another evaporator coil
option offered. Face control is the simplest form of capacity
control. These coils are normally furnished with two
distributors and two suction connections offering 50% capacity
reduction capabilities.
Model ER
CAUTION
Cautions indicate potentially hazardous situations, which can
result in personal injury or equipment damage if not avoided.
Receiving Instructions
1 All McQuay coils are factory tested at 315 psig minimum
air pressure while submersed in water, inspected, and
carefully packaged.
2 Damage to the coils can occur after they have left the
factory. Therefore, the coils should be inspected for
shipping damage upon receipt. The freight bill should also
be checked against items received for complete delivery.
Figure 1: Evaporator Coil Types
McQuay offers a row control option (model ER - Figure 1) for
six row evaporator coils. These coils are split into two rows
and four rows that offer approximately a 50% capacity
reduction.
Model EJ
These evaporator coils (model EJ - Figure 1) come with
interlaced circuiting. This form of capacity control utilizes two
distributors with each feeding every other tube in the first row
of the coil. Each distributor has a separate suction connection.
Model EK
For applications that require face control and interlaced
circuits, we offer evaporator model EK (Figure 1). Interlaced
face control utilizes four distributors and four suction
connections.
EN
Normal
Rows 2, 3, 4, 5
6, 8, 10, 12
McQuay IM 902 3
EF
Face Control
Rows 2, 3, 4, 5
6, 8, 10, 12
ER
Row Control
Rows 6
2 Distributors
EJ
Interlaced
Rows 3, 4, 6, 8
2 Distributors
EK
Interlaced
Face Control
Rows 4, 8
4 Distributors
Loading...