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1E-138B 

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.

Summary of Contents for Dari-Kool III-120

Page 1: ...em Disclaimers No warranties are contained in these instructions The division of responsibilities stated above is a general reminder of those provisions in the applicable dealer contract and does not...

Page 2: ...idelines 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 cl...

Page 3: ...power will have to be applied to the valve in order to close it while checking for leaks DO NOT apply power to the heating element unless it is covered with water 7 The Dari Kool III 120 has dual mag...

Page 4: ...and condensor and to drop down from the compressor discharge to form a 6 152 mm trap to prevent oil and liquid refrigerant from accumulating on the discharge valve plate When two circuits of the Dari...

Page 5: ...t used control wires for valve must be isolated The equipment ground must be completed The wiring must conform to local and state electrical codes and must be installed by qualified personnel The diag...

Page 6: ...efrigerant capacity Condensing unit not to exceed 15 tons 53 kW of R 22 R 404 or R 407 or 7 5 tons 26 kW of R 134A Refer to table for recommended line sizing Figure 6 1 ton 3 5 kW of refrigerant capac...

Page 7: ...condensing unit capacity of 1 ton each Figure 9 Dari Kool III 120 in parallel with a large condensing unit Add additional Dari Kool III 120 as required Condensing unit is not to exceed 30 105 kW tons...

Page 8: ...d 15 tons 52 7 kW of R 22 R 404 or R 407 or 7 5 tons 26 kW tons of R 134A Minimum of 3 ton 10 5 kW condensing unit Figure 10 Dual condensing units dual temperature Each condensing unit does not to exc...

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