1E-138B
2
Dari-Kool III-120 Instructions
- WARNING —————————–––——————––––
Important Instructions in accordance with American National
Standard Z21.22 for installing pressure and relief valves. Install
temperature and protection equipment required by local codes,
but not less than a combination temperature and pressure relief
valve certified as meeting the requirements for relief valves and
automatic gas shutoff devices for hot water supply systems, ANSI
Z21.22-1971 by a nationally recognized testing laboratory that
maintains periodic inspection of production of listed equipment
or materials. The valve must be oriented, provided with tubing, or
otherwise installed so that discharge can exit only within 6 inches
above, or at any distance below the structural floor, and cannot
contact any live electrical part.
Installation Note: TPR valve must be installed so that the sensing
element is within the top 6 inches of the tank.
Important Note: A temperature and pressure relief valve is for
protection against both excessive temperature and pressure; and
if either of these conditions develop in the system, the valve will
open and discharge water. ( label P/N 4016124)
1.2
Control Circuit
The control circuit consists of a manual-reset high-limit control
in series with two separate thermostats. One thermostat
controls the electric heating element. The other thermostat,
in conjunction with an optional valve, controls the water
temperature with respect to the refrigerant heat input. All of
the controls open on temperature rise.
1.3
Control Settings
The factory settings on the controls are as follows: Limit 210 °F
(98° C) (fixed), thermostat for electric eating element 160°F
(71°C), refrigerant thermostat 170°F (77° C). For minimum
energy consumption the electric heat thermostat should be set
for the lowest possible setting consistent with water temperature
requirements. The refrigerant thermostat should always be at
least 10°F (-12º C) higher, but not more than 170°F (77° C).
In order to minimize the danger of scalding, this setting should
be as low as possible, consistent with usage requirements.
1.4
Optional Water Valve
A water valve is available for controlling the water temperature
with respect to the reclaimed heat energy. The water valve is
used to remove excessive energy from the Dari-Kool III-120
to limit the water temperature. The valve is normally open, so
water will flow from the Dari-Kool III-120 when the valve is not
energized. When the water temperature rises to the thermostat set
point, hot water will be bled through the valve to dissipate more
energy than is being absorbed. The water temperature will drop
to the thermostat cut-in temperature, and then the valve will be
activated, stopping the flow. Only the amount of hot water equal
to the excess refrigerant energy will be bled off.
2.
Choosing the Location for the Dari-
Kool-120
The location for the Dari-Kool III-120 should be chosen
carefully. The following guidelines must be observed.
1. The Dari-Kool III-120 should be in a clean dry place, as close
as possible to the compressor to minimize the refrigerant line
lengths.
2. It should be located with adequate clearance for ease of
installation and service.
3. It must be in an area that is protected from freezing.
4. It should be located where water would not damage the
surroundings or critical areas of the building if a fitting leaks.
If a pitched floor to an open drain is not available, a catch pan
should be constructed. See Figure 1.
5. It must not be located where flammable liquids are stored
or where combustible vapors might be ignited by the
arc drawn inside the thermostat when it cycles.
3.
Installing the Dari-Kool III-120
Many localities have enacted regulations, ordinances, or codes
governing the installation of water heaters and heat reclaimers.
All local electrical, refrigeration, and plumbing codes must be
complied with and the installation must be accomplished only
by qualified personnel.
1. After the location has been determined, the Dari-Kool
III-120 should be moved into position and leveled. At this
time, reevaluate the working space allowed for making the
refrigeration connections and checking for refrigeration
leaks.
2. The cold water inlet is located at the bottom of the tank.
Provide a union, shut-off valve, and drain valve for this
connection. Refer to Figure 1 for typical arrangements.
3. The hot water outlet is at the top of the tank. A reducing
tee and a combination pressure/temperature relief valve are
furnished with the Dari-Kool III-120. These must be installed
so the sensing element extends inside the tank and the hot
water discharge is horizontal, as shown in Figure 2. Connect
the outlet of the relief valve to a suitable open drain. The
drain pipe must pitch downward from the valve and should
be no smaller than the size of the outlet valve. The end of
the drain line should be close to the floor with a 6” (152 mm)
air gap. It must not be concealed and should be protected
from freezing. No valve of any type may be installed between
the relief valve and the tank or in the drain line.
- CAUTION —————————–––——————–––––
Failure to properly install the discharge line from the safety relief
valve could result in hot water spraying on a person, causing
burns.
- WARNING —————————–––——————––––
Important Instructions in accordance with American National
Standard Z21.22 for installing pressure and relief valves. Install
temperature and protection equipment required by local codes,
but not less than a combination temperature and pressure relief
valve certified as meeting the requirements for relief valves and
automatic gas shutoff devices for hot water supply systems, ANSI
Z21.22-1971 by a nationally recognized testing laboratory that
maintains periodic inspection of production of listed equipment
or materials. The valve must be oriented, provided with tubing, or
otherwise installed so that discharge can exit only within 6 inches
above, or at any distance below the structural floor, and cannot
contact any live electrical part.
Installation Note: TPR valve must be installed so that the sensing
element is within the top 6 inches of the tank.
