22
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
Trilogy
®
Variable
(VE) Series IOM - 60Hz HFC-410A
C r e a t e d : 4 O c t o b e r, 2 0 1 9
-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 Specific Gravity
Chart 1b: Propylene Glycol Specific Gravity
Chart 1c: Ethanol Specific Gravity
Ground Loop Heat Pump Applications
Low Water Temperature Cutout Setting
- When anti-freeze
is used in the ground loop heat exchanger the EXM controller
Source Anti-Freeze setting (MENU>SETTINGS>INSTALLATION
SETTINGS>EQUIPMENT>LOOP PUMP CONFIG>SOURCE
ANTI-FREEZE) should be changed to “Yes” for systems with anti-
freeze(10°F evaporator temperature), or “No” for systems without
anti-freeze (30°F evaporator temperature). See Figure 17.
Figure C: Thermostat Screen - Low Temperature Cutout
Selection
�
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 flush cart noting the
color of the discharge fluid. 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 flammable, and care should be taken with all
flammable liquids. Open flush valves to flush through
both the unit and the loop and flush until fluid 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 fluid temperature and prepare it for
pressurization. Devoting this time to clean up can be
useful. This procedure helps prevent the periodic “flat”
loop condition.
6) Close the flush cart return valve; and immediately
thereafter, close the flush 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 fluid 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 flush 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. Specific gravity hydrometers are available
in the residential price list. Repeat after reopening and
flushing for a minute to ensure good second sample
of fluid. Inadequate antifreeze protection can cause
nuisance low temperature lockouts during cold weather.
7) Close the flush cart return valve; immediately thereafter,
close the flush cart supply valve, shut off the flush 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 flammable 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.
Pump Settings
Loop Option Single
Heating Delta T 7.0º F
Cooling Delta T 10.0º F
Source Anti-Freeze No
An access code is required to enter the Installation Settings
menu from the iGate Connect thermostat. The access code is
4795. It must be entered using the arrow keys on the thermo-
stat to select each number and the OK button to enter each one.
