lp-445-r4 Rev. 006 Rel. 027 Date 7.21.20
18
J. Fill and Purge Heating System
•
Attach the hose to balance and purge hose connector or
drain valve and run hose to nearest drain.
•
Close the other side of the balance and purge valve or the
shut off valve after the drain.
•
Open first zone balance and purge or drain valve to let
water flow out the hose. If zone valves are used, open the
valves one at a time manually. (NOTE: You should check the
valve manufacturer’s instructions prior to opening valves
manually, so as not to damage the valves.)
•
Manually operate fill valve regulator. When water runs out
of the hose, you will see a steady stream of water (without
bubbles). Close balance and purge valve or drain to stop the
water from flowing. Disconnect the hose and connect it to
next zone to be purged.
•
Repeat this procedure for additional zones (one at a time).
For installation that incorporates standing iron radiation and
systems with manual vents at the high points, follow previous
section and, starting with the nearest manual air vent, open until
water flows out. Then close vent. Repeat procedure, working your
way toward the furthest air vent. It may be necessary to install
a basket strainer in an older system where larger amounts of
sediment may be present. Annual cleaning of the strainer may be
necessary.
Upon completion, make sure that the fill valve is in the automatic
position and each zone balance and purge or shut off is in an open
position and zone valves are positioned for automatic operation.
K. Freeze Protection Fluids
Use only inhibited glycol solutions which are specially formulated for
hydronic systems. Ethylene glycol is toxic and can attack gaskets and
seals used in hydronic systems. Glycol mixtures should not exceed
50%.
1. Glycol in hydronic applications is specially formulated for this
purpose, and includes inhibitors that prevent the glycol from attacking
metallic system components. Make certain that the system fluid is
checked for the correct glycol concentration and inhibitor level.
2. The glycol solution should be tested at least once a year and as
recommended by the glycol manufacturer.
3. Anti-freeze solutions expand more than water. For example: A
50% by volume solution expands 4.8% in volume for a temperature
increase from 32
o
F to 180
o
F, while water increases 3% over the same
temperature rise. Allowances must be made for this expansion in the
system design.
4. A 30% mixture of glycol will result in a BTU output loss of 15% with a
5% increase in head against the system circulator.
5. A 50% mixture of glycol will result in a BTU output loss of 30% with a
50% increase in head against the system circulator.
Basic steps are listed below that will guide the installation of the
boiler.
1. Connect the system return marked “Boiler Return”.
2. Connect the system supply marked “Boiler Supply”.
3. Install purge and balance valve or shut off valve and drain on
system return to purge air out of each zone.
4. Install a back flow preventer on the cold feed make-up water line.
5. Install a pressure reducing valve on the cold feed make-up water
line (15 PSI nominal on the system return). Check temperature and
pressure gauge when operating. It should read a minimum pressure
of 12 PSI.
6. Install a circulator as shown in piping details (this section). Make
sure the circulator is properly sized for the system and friction loss.
7. Install an expansion tank on the system supply. Consult the tank
manufacturer’s instructions for specific information relating to
expansion tank installation. Size the expansion tank for the required
system volume and capacity.
8. Install an air elimination device on the system supply.
9. Install a drain valve at the lowest point of the system.
NOTE:
The
boiler cannot be drained completely of water without purging the
unit with an air pressure of 15 PSI.
10. The relief valve is installed at the factory. A pipe discharge line
should be installed to discharge 6” above the drain in the event of
pressure relief. The pipe size must be the same size as the relief valve
outlet.
NEVER BLOCK THE OUTLET OF THE SAFETY RELIEF VALVE.
I. Plumbing
This boiler should not be operated as a potable hot water heater. It
should not be used as a direct hot water heating device.
Pressure Relief Valve
Factory supplied on boiler. The pressure relief valve is sized to ASME
specifications. Storage tank may require additional relief valves
depending on local codes.
Minimum Pipe Size
All Models
2” NPT
Table 8 - Minimum Pipe Size
It is highly recommended that you carefully follow the glycol
manufacturer’s recommended concentrations, expansion
requirements, and maintenance recommendations (pH additive
breakdown, inhibitor reduction, etc.). Carefully figure the additional
friction loss in the system as well as the reduction in heat transfer
coefficients.
L. Zoning with Zone Valves
1. When zoning with zone valves, connect the boiler to the system as
shown in Applications. The primary/secondary piping shown ensures
the boiler loop will have sufficient flow. It also avoids applying the high
head of the boiler circulator to the zone valves.
2. Connect DHW (domestic hot water) piping to indirect storage water
heater as shown in Applications.
M. Zoning with Circulators
1. When using circulator zoning, connect the boiler to the system as
shown in Applications. NOTE: The boiler circulator cannot be used for a
zone. It must only supply the boiler loop.
2. Install a separate circulator for each zone.
3. Connect DHW (domestic hot water) piping to indirect storage water
heater as shown in Applications.
N. Multiple Boilers
1. Connect multiple boilers as shown in Applications.
2. All piping shown is reverse return to assure balanced flow throughout
the connected boilers.
3. Each connected boiler must have its own circulator pump to assure
adequate flow.
4. Connect DHW (domestic hot water) piping to indirect storage water
heater as shown in Applications.
5. The system flow (secondary loop) must be greater than the boiler’s
primary loop flow.
Water temperature above 140
o
F requires the circulator pump to run
continuously and water hardness between 5 and 7 grains. Hardness
above 7 grains will damage the heat exchanger and shorten the
service life of the boiler.
Содержание MODCON500 FS
Страница 34: ...lp 445 r4 Rev 006 Rel 027 Date 7 21 20 34 Figure 26 Cascade Master and Follower Wiring ...
Страница 61: ...lp 445 r4 Rev 006 Rel 027 Date 7 21 20 61 Figure 34 Water Side Replacement Parts All Models ...
Страница 62: ...lp 445 r4 Rev 006 Rel 027 Date 7 21 20 62 Figure 35 Cabinet Replacement Parts All Models See Table ...
Страница 65: ...lp 445 r4 Rev 006 Rel 027 Date 7 21 20 65 Maintenance Notes ...
