20
G e o t h e r m a l H e a t i n g a n d C o o l i n g
Tranquility
®
30 Digital (TE) Series IOM - 60Hz HFC-410A
R e v. : 2 9 M a y, 2 0 1 5 J
-50°F
-40°F
-30°F -20°F
-10°F
0°F
10°F
20°F
30°F
40°F
50°F
0.960
0.965
0.970
0.975
0.980
0.985
0.990
0.995
1.000
Low Temperature Protection
Specific Gravity
-45.6°C
-40°C
-34.4°C
-28.9°C
-23.3°C
-17.8°C
-12.2°C
-6.7°C
-1.1°C
4.4°C
10°C
1.00
1.01
1.02
1.03
1.04
1.05
1.06
1.07
Low Temperature Protection
Specific Gravity
-40°F
-30°F
-20°F
-10°F
0°F
10°F
20°F
30°F
40°F
-40°C
-34.4°C -28.9°C -23.3°C -17.8°C -12.2°C
-6.7°C
-1.1°C
4.4°C
0.975
0.980
0.985
0.990
0.995
1.000
-5°F
0°F
5°F
10°F
15°F
20°F
25°F
30°F
35°F
1.7°C
-1.1°C
-3.9°C
-6.7°C
-9.4°C
-12.2°C
-15.0°C
-17.8°C
-20.6°C
Low Temperature Protection
Chart 1a: Methanol Specifi c Gravity
Chart 1b: Propylene Glycol Specifi c Gravity
Chart 1c: Ethanol Specifi c Gravity
Ground Loop Heat Pump Applications
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).
Figure 17: Low Temperature Cutout Selection
Comp
Relay
24Vdc
EH1
EH2
P6
Off On
JW3
c1
ay
c2
ay
CO
RV
RV
LT2
LT2
P7
CC
CCG
CO
S1
S2
12
1
4
Off On
AO2
P11
Gnd
T1
P10
T2 T2 T3
T3 T4 T4
T5
P9
T5 T6 T6
A0-1 A0-2
Off On
S3
RV
Relay
CCH
Relay
1 2 3 4
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
O1 Gnd
DXM2 PCB
JW3-LT1 jumper should be clipped
for low temperature operation
WARNING!
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).
Always wear eye protection and rubber gloves. 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
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 o
ff
the
fl
ush cart
leaving a positive pressure in the loop of approximately
50-75 psi [345-517 kPa]. Refer to Figure 15d for more
details.
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.
When handling methanol (or any alcohol), always wear
eye protection and rubber gloves as alcohols are easily
absorbed through the skin.
