Revolv Coil Installation Instructions

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2. Matching of indoor coils for heat pumps demands that the
heat rejection capacity, internal volume, and equivalent
metering device of the matched coil be at least equal to that
of the smallest internal volume matched coil recommended
by outdoor unit manufacturer for that outdoor unit.
3. It is important that selection be based on Revolv guidelines
for a specific coil with a specific metering device to be used
with an outdoor heat pump unit of a specific make, series,
and model number.
4. Failure to conform to proper selection requirements will affect
efficiency, charging, and reliability and may result in damage
to the system or system components and void the manufacturer
limited warranty.
5. The matching of specific indoor heat pump coils with specific
outdoor heat pump units as certified in the heat pump section
of the current AHRI Directory will assure proper and efficient
operation of heat pump systems. See www.ahridirectory.org.
SPECIAL INSTRUCTIONS FOR CHARGING HEAT PUMP
COILS
All Quick Connect Heat Pump systems are a hassle free application
when the indoor coil and CFM (Min 360 / 12M BTUs) match. The
QC systems are designed at 5 to 9 degrees sub cooling in the cooling
mode depending on the size system.
When using the Revolv sweat connect indoor coils the installer
should be sure the system is properly matched. The R-410A systems
must be listed in AHRI. The R-22 replacement coils are the only
exception. Existing R-22 coils must be matched with the outdoor
unit. If the indoor-outdoor listing is not available the coil model
number should be noted so the proper replacement is used. If the
indoor model number is not available then a description of the
existing coil must be noted, such as; coil face area (aluminum area)
and number of rows of copper(2-Row, 3-Row or 4-Rows).
Contact Tech Support if problems are encountered during the
installation process and all other factors above are correct, such as;
air flow, AHRI listing, etc.
SPECIAL METERING DEVICE INSTRUCTIONS FOR TXVs
AND PISTON COILS
All Revolv Thermal Expansion Valves have a built in check system
for heat pump applications and can be used on both A/C and H/P
applications. Revolv offers three sizes R-410A TXVs, the
18R72DB0003 TXV has an operational range of 1.5-3.0 Ton (1830
& 1836) The R72DB0004 valve has an operational range of 2.5-4.0+
Ton (1843, 1854, 1851, 1855) depending on coil size and application.
The R72DB0044 valve has an operational range of 3.0-6.0 Ton
(1856) depending on application. This valve is super heat adjustable
but set at 8-10 degrees at the bulb location. Other refrigerant valves
are available. The Revolv QC coils shipped from the factory with the
TXV mounted in the distributor body has the equalizer bulb mounted
on the suction manifold. The sweat connect does not have the bulb
mounted. This is a safety feature to allow the torching of the suction
line without damaging the TXV from the heat of the torch. The bulb
should be installed on the horizontal run of the suction manifold, if
possible. Good contact between the bulb and the copper line is
mandatory. See “Horizontal Bulb Locations guide below.
If the bulb is made on the vertical run the bulb should be located at
least 6 inches from any bend and mounted on the tubing side opposite
the plane of the bend. On this location the bulb should be positioned
with the capillary tube at the top. The bulb should be insulated using
thermal insulation to protect it from the effect of the surrounding
ambient temperature.
Revolv coils use the Chatleff type distributor body that accepts a
screw on TXV or accepts a Chatleff style piston. All metering
devices, both pistons and TXVs, have a relationship to the outdoor
unit. The proper metering device allows for proper system operation
but does not increase or decrease the capacity. The system capacity is
determined by the relationship of the indoor-outdoor combination
and air flow.
The use of the TXV is an advantage and allows for a wider
operational range when matched with the proper outdoor unit . In
manufactured housing the largest problem associated with a TXV is
dirty coil and / of low air flow. If opening the distributor body is
required check condition of Teflon O-Ring and torque the body at 10
lb-ft when closing system. Replace the O-Ring if necessary.