Aqua-Hot 375-LP Installation Manual download pdf (Page 42)

375-LP Installation Manual

of the Aqua-Hot.

8. Close the drain valve.

Purging the System by Grounding the Zone

Thermostat Connection:

1. Ensure that the boiler tank has been filled with

the appropriate mixture of antifreeze and water

heating solution.

2. Locate Terminal Block for switches, heat ex-

changers, fans and thermostats. Reference Fig-

ure 51.

3. Locate the thermostat connection terminals T1

and T2. Reference Figure 52.

4. Connect a wire to the desired zone terminal and

connect the opposite end of the cable to a

ground source. Reference Figure 52.

5. Allow the circulation pump to operate for ap-

proximately 1-3 minutes in order to purge the

corresponding heating loop, then remove the

wire from the ground source.

6. Open the drain valve and completely fill the

Aqua-Hot’s boiler tank with additional antifreeze

and water heating solution.

Repeat steps 5 and 6 for both heating loops until

all air has been completely bled from the entire

heating system

8. Once the systems have been purged, disconnect

the wire from the ground source and the termi-

nal block.

9. Check the Aqua-Hot’s expansion tank and top it

off to the cold level mark with the antifreeze and

water solution, if necessary.

10. Ensure that each thermostat’s connection wiring

is still in its original configuration. Reference Ap-

pendix A.

SECTION 10: PURGING THE SYSTEMS

— Page 42 —

1. Refer to the information and chart in Appendix

E and determine the level of protection required

for your operating conditions.

2. Mix propylene glycol based antifreeze and water

to meet the level of protection you require.

3. Measure the level of propylene glycol in the anti-

freeze solution to ensure it is mixed to the

proper level of protection.

4. Open the Aqua-Hot’s drain valve located at the

front of the heater. Reference Figure 50.

5. Connect a piece of 1/2 inch PEX-type tubing to

the drain valve. This piece should be long

enough to transport the antifreeze and water

heating solution from its source to the Aqua-

Hot.

6. Fill the Aqua-Hot completely with the proper

mixture of antifreeze solution. This will take

approximately five gallons; look for the solution

to enter the overflow tube attached to the ex-

pansion tank connection on top of the Aqua-

Hot.

7. When refilling, open the air-release valve located

on the expansion tank connection to release air

pockets. Reference Figure 47. Hold the valve

open until all air is released. Be sure the valve is

closed when finished by hand-tightening. Look

for the solution to enter the overflow tube at-

tached to the expansion tank connection on top

NOTE:All air is bled from the heating system when the

antifreeze solution enters the overflow tube at-

tached to the expansion tank connection.

NOTE:The circulation pump will activate as soon as the

terminal is connected to a ground source; there-

fore, disconnect the wire from the ground source

during the antifreeze and water heating solution

filling procedure.

CAUTION

Propylene glycol based antifreeze solution is not 100%

propylene glycol. Some propylene glycol based antifreeze

solution is premixed with water.

NOTE:See Appendix D for water quality recommenda-

tions and Appendix E Antifreeze mixture informa-

tion and ratios.

Purging the Hydronic Heating System (Continued):

NOTE:

Use a refractometer to properly measure the per-

cent of propylene glycol in the antifreeze solu-

tion. Ball-type hydrometers typically used for

measuring the percentage of ethylene glycol in

automotive applications will not properly meas-

ure the level of propylene glycol. See Appendix

F on Page 52.

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 55 56

Comments to this Manuals

No comments

Aqua-Hot 375-LP Installation Manual Page 42

Comments to this Manuals

Related products and manuals for Water heaters & boilers Aqua-Hot 375-LP