Slant/Fin LX-150CB - Manual (Page 24)

Lynx Combi Boiler 24
WATER PIPING
A. Connection of system to boiler:
Primary/secondary piping should be used to ensure the
proper flow through the boiler. (See Figures 20 through 22).
The boiler loop piping must be the same diameter as the
water outlet (supply) and inlet (return) piping connections
provided on the boiler, particularly on longer loops.
See page 2 for piping connection size.
B. Circulator Pumps:
The boiler loop piping must utilize the Taco 0011 or Grundfos
UPS 26-99F circulator that is supplied with the boiler, to
ensure the proper flow through the boiler. Refer to Figure 19
for the boiler water side pressure drop. Install the pumps in
the orientation shown in Figures 20 through 22.
C. Relief Valve(supplied with boiler):
Tee the relief valve into the boiler water outlet (supply) piping
as close to the water outlet (supply) connection as possible.
(See Figure 18). The relief valve’s discharge piping must be
the same size or larger than the relief valve’s outlet, and must
terminate 6” minimum from floor with a plain (no threads) end.
Place a bucket under pressure relief valve discharge. Make
sure discharge is always visible. DO NOT hard-pipe to drain
piping, or any place where freezing could occur. No shut-off
valve is permitted between the relief valve and boiler, or in the
discharge line.
D. Air Control System:
An appropriately sized diaphragm-type expansion tank must
be used to control the system pressure. See boiler volume
data on page 2, and the recommended location in Figures 20
through 22. An air vent is recommended to be installed on an
air separator in close proximity to the expansion tank.
E. Cold Water Fill:
A pressure reducing (fill) valve, with a shut-off valve upstream
of it, should be installed in close proximity of the expansion
tank. (See Figures 20 through 22). Use a back flow check
valve in the cold water supply as required by local codes.
F. Low Water Cutoff:
On a hot water boiler installed above radiation level, the boiler
must be provided with a low water cutoff device at the time of
installation by the installer (see Figure 18 for piping
arrangement).
G. Water Treatment and Freeze Protection:
A good water treatment program will not only extend the
useful life of this boiler but it will also save much of the time
and expense of repairs made necessary by preventable
occurrences. A reputable water treatment company that has
experience with aluminum boilers should be consulted to
evaluate and determine the best overall treatment program for
your boiler.
The heat exchanger of this boiler is made of aluminum, so the
system water PH must be maintained between 7.5 and 8.5 level.
Procedure:
1. Thoroughly drain and flush the system (new or used)
with fresh water before connecting the boiler to the
system to remove any sediment or glycol.
2. Install the boiler per instructions in this manual.
3. It is recommended to clean the heating system with
proper cleaner. Do not use phosphate-based (TSP)
cleaners, as they will harm aluminum heat exchanger.
Follow manufacturer instruction. Rhomar Hydro-Solv
9100 is recommended (add approximately 1 gallon
per 50 gallon of system water). Circulate cleaner for
minimum of 1/2 hour, and then thoroughly flush until
the water runs clear.
4. It is recommended to add system treatment
(inhibitor). Do not use phosphate, nitrate or high pH
products. Follow manufacturer instructions. Rhomar
Pro-Tek 922 is recommended at the rate of 1 gallon
per 50 gallon of system water.
Note: Extra inhibitor may not be needed if using the
approved antifreeze containing inhibitor additive as
listed below.
Test the PH of the water system annually, if the PH is
out of the range (7.5-8.5), the inhibitor level may not
be sufficient, add inhibitor to the system.
5. Anti-freeze is sometimes used in hydronic systems to
protect against freeze-up in the event of power failure
or boiler shut down in the cold winter.
Approved anti-freeze is RhoGard (propylene glycol
with Pro-Tek 922 inhibitor) by Rhomar Water
Management Inc. or Noburst AL by Noble. Follow the
manufacturer’s instructions for proper application and
proper mixture for the minimum ambient temperature.
Any use of anti-freeze other than that supplied by
Slant/Fin or approved will void the warranty.
Notice: When adding less than 50% RhoGard
antifreeze to a system, additional inhibitor should be
added to ensure adequate corrosion protection.
Keep water hardness less than 7 grains/gallon. It is
recommended to use water softener for hard water
areas or if well water is used.
Never use Ethylene glycol, as it is toxic to humans.
Never use any type of automotive or standard glycol
freeze protection fluid. Do not exceed 50% by volume
concentrate of anti-freeze. Check anti-freeze
concentration annually.
H. Piping a heating - cooling system to a water boiler and
chiller:
Figure 22 illustrates a method of piping a heating-cooling
system to a water boiler and a chiller. Hand valves (shown)
or automatic valves must be installed to prevent circulation
of chilled water in the boiler or hot water in the chiller.
The air control system and pressure control system must
operate with chiller only, or the boiler only, being valved to
the piping system. Separate control devices on the boiler
and chiller may be used, or a single set of air and pres-
sure controls on the common piping may be preferred.
If the boiler is used to supply hot water to heating coils in
air handling units, flow control valves or other devices
must be installed to prevent gravity circulation of water in
the coils during the cooling cycle.