And Dhw Loop Water Chemistry Requirements; Freeze Protection - NTI TRX150 Manual

Part 1 - General Safety Information
F. CH and DHW Loop Water Chemistry Requirements
CAUTION
Chemical imbalance of the water supply may affect efficiency and
cause severe damage to the boiler and associated equipment.
Water quality must be professionally analyzed to determine
whether it is necessary to treat the water. Various solutions are
available to adjust water quality. Adverse water quality will affect
the reliability of the system. In addition, operating temperatures
o
above 135 F will accelerate the build-up of lime scale and possibly
shorten boiler service life. Failure of a boiler due to lime scale
build-up, low pH, or other chemical imbalance IS NOT covered by
the warranty.
The water must be potable, free of corrosive chemicals, sand,
dirt, and other contaminates. It is up to the installer to ensure the
water does not contain corrosive chemicals or elements that can
damage the heat exchanger. Potable water is defined as drinkable
water supplied from utility or well water in compliance with EPA
secondary maximum contaminant levels (40 CFR Part 143.3). If
the water contains contaminants higher than outlined by the EPA,
water treatment is recommended and additional, more frequent
maintenance may be required. See Table 1.
If you suspect that your water is contaminated in any way,
discontinue use of the appliance and contact an authorized
technician or licensed professional.
CH Loop Total Water Hardness Specifications
Contaminant
Total Hardness
DHW Loop Total Water Hardness Specifications
Contaminant
Total Hardness
o
(Below 140 F water temperature)
Total Hardness
o
(Above 140 F water temperature)
CH and DHW Loop Water Quality Specifications
Contaminant
Aluminum
Chloride
Copper
Iron
Manganese
pH
Sulfate
Total Dissolved Solids (TDS)
Zinc
Dissolved Carbon Dioxide (CO2)
Table 1 - Water Quality Specifications
G. Freeze Protection
CAUTION
Consider piping and installation when determining boiler location.
Damages resulting from incorrect installation or from use of
products not approved by the manufacturer ARE NOT covered by
warranty. Failure of the boiler due to freeze related damage IS NOT
covered by product warranty.
8
Maximum Allowable Level
120 mg/l
(7 grains/gallon)
Maximum Allowable Level
200 mg/l
(12 grains/gallon)
120 mg/l
(7 grains/gallon)
Maximum Allowable Level
0.05 to 0.2 mg/l or PPM
100 mg/l or PPM
1 mg/l or PPM
0.3 mg/l or PPM
0.05 mg/l or PPM
6.5 - 8.5
205 mg/l or PPM
500 mg/l or PPM
5 mg/l or PPM
15 mg/l or PPM
WARNING
NEVER use any toxic chemical, including automotive, standard
glycol antifreeze, or ethylene glycol made for hydronic (non-
potable) systems. These chemicals can attack gaskets and seals in
water systems, are poisonous if consumed, and can cause personal
injury or death.
NOTE: Loops Serving Indirect Water Heaters (IWHs)
Glycol used in IWH loops should be food grade propylene glycol,
FDA rated as "generally recognized as safe" (GRAS). If using a glycol /
potable water mix, the water chemistry must meet the requirements
in this manual. The glycol content of the liquid must not exceed 50%,
unless the manufacturer specifies a different ratio. Glycol should be
checked periodically to prevent it from becoming acidic. Please refer
to guidelines provided by the glycol manufacturer regarding glycol
maintenance.
NOTE: Glycol not recognized as GRAS may only be used in closed loop
CH applications.
NOTE: NTI DOES NOT WARRANT THE BOILER AGAINST FREEZE-RELATED
DAMAGE.
The boiler control is equipped with freeze protection that activates
based on internal water temperature. See the following table for
details on freeze protection operation.
NOTE: Freeze protection will not be active if the boiler loses power.
FREEZE PROTECTION OPERATION
The water temperature detected by probes NTC1 or
Condition
NTC2 ranges between 39
• The internal pump operates at high speed.
• The 3-Way Valve alternately switches positions - 1
minute on heating mode to 1 minute on DHW
Events
mode
• The display shows the
Until the NTC1 and NTC2 temperature is greater than or
Time
If after 20 minutes the conditions described in Stage 1
are still present, the boiler proceeds to Stage 2.
The water temperature detected by probes NTC1 or
Condition
NTC2 is less than 39
• The burner turns on at minimum power.
• The 3-Way Valve is positioned on DHW and
switches every 30 seconds between CH and DHW.
• When the temperature is greater than or equal to
o o
104 F (40
maintain the temperature between 95
o
and 104 F (40
Events
• After 45 minutes there will be 2 minutes of post
heating circulation.
• If the temperature falls below 46
150 minutes the burner will immediately power on
again.
• The display shows the
Until the NTC1 temperature is greater than or equal to
Time
Table 2 - Freeze Protection Detail
STAGE 1
o o o o
F (4 C) and 46 F (8 C).
icon.
equal to 46°F (8°C)
STAGE 2
o o
F (4 C).
C) the burner will turn off. The boiler will
o
F (35
o
C) for 45 minutes.
o o
F (8 C) within
icon.
o o
104 F (40 C)
o
C)