Use and Care Manual

56
NOTE: 0~10V is prioritized. If input voltage is less than 1.5V then T/T will operate.
The range of input voltage is approximately 1.5[V] ~ 10[V] and the heating temperature settings according to this range are as follows.
Reversed polarity could lead to erratic and/or no response from the appliance controller.
0-10 V INPUT TABLE:
When outside voltage is applied to the connector (2) in the wiring diagram,
1. The Outdoor temperature sensor does not work.
2. Symbol is displayed.
3. The heating temperature is automatically set according with the external voltage input.
The water must be potable, free of corrosive chemicals, sand, dirt, and other contaminants. 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 dened as drinkable water supplied from utility or
well water in compliance with EPA secondary maximum contaminant levels (40 CFR Part 143.3) as shown in the table below. If the water contains
contaminants higher than outlined by the EPA, water treatment is recommended and additional, more frequent maintenance may be required.
If you suspect that your water is contaminated in any way, discontinue use of the appliance and contact an authorized technician or licensed
professional.
Input Voltage[V]
Heat Temperature [°C]
Heat Temperature [°F]
1.5 30.0 86
2.0 32.7 91
2.5 36.1 97
3.0 38.8 102
- - -
9.0 75.0 167
9.5 77.7 172
10 82.2 180
Contaminant Maximum Allowable Level Contaminant
Maximum Allowable Level
Total Hardness (Residential Use -
Below 140°F water temperature)
200 mg/l (12 grains/gallon) Manganese 0.05 mg/l or PPM
Total Hardness (Commercial Use -
140°F and above water temperature)
120 mg/l (7 grains/gallon) pH 6.5-8.5
Aluminum 0.05 to 0.2 mg/l or PPM Sulfate 205 mg/l or PPM
Chloride 100 mg/l or PPM Total Dissolved Solids (TDS) 500 mg/l or PPM
Copper 1 mg/l or PPM Zinc 5 mg/l or PPM
Iron 0.3 mg/l or PPM
Dissolved Carbon Dioxide
(CO
2
)
15 mg/l or PPM
Table 23 – 1~10V Input Voltage and Associated Temperature
Table 24 – Water Chemistry Specications
PART 11 – START-UP PREPARATION
▪ A. CHECK / CONTROL WATER CHEMISTRY
WARNING
CAUTION
Thoroughly clean and ush any system that has used glycol before installing the appliance.
Chemical imbalance of the water supply may affect efciency and cause severe damage to the appliance 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 above 135°F will accelerate the build-up
of lime scale and possibly shorten appliance service life. Failure of an appliance due to lime scale build-up, low pH, or other chemical imbalance
IS NOT covered by the warranty.