EVM4X, WMVM: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
2
IMPORTANT: Nitrogen can leak out through the hole that the needle
pierced in the plugs. This does not indicate a leaking coil nor warrant
return of the coil.
IMPORTANT: Dry fit all connections to systems (electrical, drains,
refrigerant lines, flue & intake, etc.) first to verify no interferences
before final connections are made.
Introduction
Use this instruction manual to install indoor coils on upflow, downflow,
or horizontal furnaces in cooling or heating applications. The coils are
enclosed in a painted casing, have factory-installed TXVs, and are used
with Puron® refrigerant R-410A systems.
IMPORTANT: These coils can only operate with OD Heat Pump
installations that have a Piston Heating Metering device. Use of the
V-Coil for OD HP installations that do not have a Piston Metering
Device are not an approved installation. Refer to the AHRI Directory for
Approved Rated Combinations.
Installation
These units can be installed in upflow, downflow, or horizontal
configurations. Before installation, there are several performance
requirements that must be considered, because poor installation can
negatively affect performance. This section will briefly discuss those
factors.
Airflow
Airflow amount and distribution are vital to adequate system
performance. Problems that can be experienced with incorrect airflow
include:
• low system performance
• restricted TXV
• frosted coil
• poor humidity control
• water blow-off
When attaching the coil and building the plenum, pay special attention to
the effect these details will have on airflow. After system start-up, check
the cfm to insure that it is correct. (Generally, the cfm should be 350 to
450 cfm/ton during normal cooling operation.)
TXV
A thermal expansion valve is utilized in this coil design to optimize
performance and comfort throughout the entire cooling operating range
of the system. Special attention needs to be taken to the TXV when
installing the coil (Fig. 1):
• Do not overheat valve. Temperatures that exceed 212°F (100°C) can
harm valve performance. Use a wet cloth or heat sink when brazing.
• Place liquid filter dryer near indoor unit to reduce the risk of debris
clogging the valve.
• Make sure TXV bulb is securely fastened with a metal strap and
wrapped in the indentation on vapor line tube.
These specific coils have a factory-installed hard-shutoff TXV designed
only for use with R-410A refrigerant. Use only with outdoor units
designed for R-410A.
NOTE: These TXVs are factory set at approximately 10° superheat
measured at the suction service valve, and are not field adjustable.
A210138
Fig. 1 – TXV Bulb
Cabinet Sweating
If this unit is installed in a garage, attic, or other unconditioned space,
special attention needs to be given to the potential of cabinet sweating. A
6-in (152 mm) wide piece of insulation should be wrapped around the
coil casing and supply duct connection point.
Inspect Equipment
File claim with shipper if equipment is damaged.
Select Installation Procedure
NOTE: Furnace coils are not approved to be used in fan coil or
“draw-through” type applications.
To install cased coils in upflow applications, follow the instructions
below (Upflow Coil Installation on p3).
WARNING
!
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal injury.
This coil contains Nitrogen precharge of 7 – 10 PSIG. Release this
pressure through the center of the rubber plugs before removing plugs.
WARNING
!
EXPLOSION HAZARD
Failure to follow this warning could result in
death, serious personal injury, and/or property
damage.
Never use air or gases containing oxygen for leak
testing or operating refrigerant compressors.
Pressurized mixtures of air or gases containing
oxygen can cause an explosion.
CAUTION
!
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and wear
appropriate protective clothing and gloves when handling parts.
CAUTION
!
UNIT OR PROPERTY DAMAGE HAZARD
Failure to follow this caution may result in property damage.
Make sure that Aluminum tubes do not come in direct contact or allow
for condensate run off with a dissimilar metal. Dissimilar metals can
cause galvanic corrosion and possible premature failure.
CAUTION
!
ENVIRONMENTAL HAZARD
Failure to follow this caution may result in environmental damage.
Federal regulations require that you do not vent refrigerant to the
atmosphere. Recover during system repair or final unit disposal.
Metal Clamp ONLY
Vapor Line
Sensing Bulb
Indentation
Sensing Bulb
TXV
Insulation Wire Tie
TXV Insulation
Wrap
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