19
R e s i d e n t i a l D i g i t a l H & V - Tr a n q u i l i t y
®
2 2 D i g i t a l ( T Z ) S e r i e s - 6 0 H z H F C - 4 1 0 A
C r e a t e d : 2 6 O c t . , 2 0 1 1 B
c l i m a t e m a s t e r. c o m
antifreeze has been added to the system. The hydrometer
can be dropped into the
fl
ush reservoir and the reading
compared to Chart 1a for Methanol, 1b for Propylene
Glycol, and 1c for Ethanol to indicate the level of freeze
protection. Do not antifreeze more than a +10°F [-12.2°C]
freeze point. Speci
fi
c gravity hydrometers are available
in the residential price list. Repeat after reopening and
fl
ushing for a minute to ensure good second sample
of
fl
uid. Inadequate antifreeze protection can cause
nuisance low temperature lockouts during cold weather.
7) Close the
fl
ush cart return valve; immediately thereafter,
close the
fl
ush cart supply valve, shut off the
fl
ush cart
leaving a positive pressure in the loop of approximately
50-75 psi [345-517 kPa]. Refer to Figure 14e for more
details.
Ground Loop Heat Pump Applications
Antifreeze Charging
It his highly recommended to utilize premixed antifreeze
fl
uid
where possible to alleviate many installation problems and
extra labor.
The following procedure is based upon pure methanol and can
be implemented during the Full Flush procedure with three
way valves in the Figure 14d - Valve Position D. If a premixed
methanol of 15°F [-9.4°C] freeze protection is used, the system
can be
fi
lled and
fl
ushed with the premix directly to prevent
handling pure methanol during the installation.
1) Flush loop until all air has been purged from system and
pressurize to check for leaks before adding
any antifreeze.
2) Run discharge line to a drain and hook up antifreeze
drum to suction side of pump (if not adding below
water level through approved container). Drain
fl
ush cart
reservoir down to pump suction inlet so reservoir can
accept the volume of antifreeze to be added.
3) Calculate the amount of antifreeze required by
fi
rst
calculating the total
fl
uid volume of the loop from Table 1.
Then calculate the amount of antifreeze needed using Table
2 for the appropriate freeze protection level. Many southern
applications require freeze protection because of exposed
piping and Flow Controller to ambient conditions.
4) Isolate unit and prepare to
fl
ush only through loop.
Start
fl
ush cart, and gradually introduce the required
amount of liquid to the
fl
ush cart tank (always introduce
alcohols under water or use suction of pump to draw
in directly to prevent fuming) until attaining the proper
antifreeze protection. The rise in
fl
ush reservoir level
indicates amount of antifreeze added (some carts are
marked with measurements in gallons or liters). A ten
inch [25.4 cm] diameter cylinder, 3 foot [91.4 cm] tall
holds approximately 8 gallons [30.3 liters] of
fl
uid plus the
hoses (approx. 2 gallons, [7.6 liters], which equals about
10 gallons [37.9 liters] total. If more than one tankful is
required, the tank should be drained immediately by
opening the waste valve of the
fl
ush cart noting the
color of the discharge
fl
uid. Adding food coloring to the
antifreeze can help indicate where the antifreeze is in the
circuit and prevents the dumping of antifreeze out the
waste port. Repeat if necessary.
5) Be careful when handling methanol (or any alcohol).
The fumes are
fl
ammable, and care should be taken
with all
fl
ammable liquids. Open
fl
ush valves to
fl
ush
through both the unit and the loop and
fl
ush until
fl
uid is
homogenous and mixed. It is recommended to run the
unit in the heating and cooling mode for 15-20 minutes
each to ‘temper’ the
fl
uid temperature and prepare it for
pressurization. Devoting this time to clean up can be
useful. This procedure helps prevent the periodic “
fl
at”
loop condition.
6) Close the
fl
ush cart return valve; and immediately
thereafter, close the
fl
ush cart supply valve, leaving a
positive pressure in the loop of approximately 50 psi [345
kPa]. This is a good time to pressure check the system
as well. Check the freeze protection of the
fl
uid with the
proper hydrometer to ensure that the correct amount of
WARNING!
WARNING!
Always dilute alcohols with water (at least
50% solution) before using. Alcohol fumes are
fl
ammable
and can cause serious injury or death if not handled
properly.
Low Water Temperature Cutout Setting
- DXM2 Control
When antifreeze is selected, the LT1 jumper (JW3) should
be clipped to select the low temperature (antifreeze 10°F
[-12.2°C]) set point and avoid nuisance faults (see “Low
Water Temperature Cutout Selection” in this manual).
