Boiler Operation
1) Appliance should begin the start-up process for
the sequence of operation.
2) The boiler will fire at approximately 50% of
rated input on initial start-up and adjust input
as required to meet system demand.
3) Based on system demand, the appliance will
modulate accordingly.
4) As system demand is satisfied, the burner will
fire at minimum fire for the given demand and
the boiler will cycle off when the demand
ceases or is interrupted. When this occurs the
combustion air fan will decelerate at a pre-
programmed rate before the appliance shuts
down.
12.8 DOMESTIC HOT WATER WITH STORAGE
TANK
Hot water heaters are designed for installation with a storage
tank. The piping between the tank and heater and the control
of water velocity, as explained below, are important for
correct operation of your hot water heater.
12.9 DOMESTIC HOT WATER WITH PLATE
HEAT EXCHANGER
The piping between the plate heat exchanger in the
DynaMax boiler and to an outlet tap is important for correct
operation of the plate heat exchanger. The following
procedure should be followed for setting the domestic hot
water tuning valve:
1) There is a temperature tuning valve inside the
Dynamax jacket on the domestic hot water outlet
from plate exchanger. This valve can be set for field
conditions.
2) First identify the highest domestic hot water load.
For example in some cases it may be the bath tub
and in some cases it may be the clothes washer.
3) Allow the Dynamax to fire up and reach full fire
under maximum hot water load demand conditions.
4) Observe the outlet water temperature and close the
tuning valve gradually as outlet temperature starts
to drop. Allow the system to reach equilibrium
between adjustments to the tuning valve.
5) Once the tuning valve is properly set, outlet
temperatures will never drop below
desired minimum temperature.
6) Seal stem of tuning valve with silicone to prevent
unauthorized tampering.
12.10 TEMPERATURE RISE AT FULL FIRING
RATE
1) The pump must run continuously when the burner is
firing.
2) With the pump running and the burner in the off cycle,
the inlet temperature and outlet temperature readings
on the DynaMax Control Panel should read
approximately the same temperatures.
3) Turn the appliance on and allow time for the
temperature to stabilize. Check the temperature rise
when the burner is firing at 100% of rated input.
4) Compare the temperature rise on the Control Panel with
the required temperature rise at the required flow rate
on Tables 31 and 32.
5) Should adjustment be needed, proceed as follows:
If the temperature rise is too high, the water velocity is
too low. Adjust as follows:
1) Check for flow restrictions. Check for debris in strainers
2) Check diameter and equivalent length of the piping
between the storage tank and hot water heater.
3) Be sure the pipes between the hot water heater and
storage tank are not more than a total of 50 equivalent
feet between supply and return lines. If maximum
equivalent length for the specified pipe diameter is
exceeded, larger diameter pipe may have to be installed
to achieve correct flow and temperature rise.
4) Be sure all valves are open between the hot water
heater and the storage tank. Ensure that all ball valves
are fully ported.
5) Check the pump to be sure it is running properly and
that the pump motor is running in the proper direction.
6) Common manifold piping for multiple unit installations
will require larger minimum pipe sizes and tank
circulating tapping to ensure proper flow.
The required temperature rise and the recommended pump
size are based on the heating of potable water with normal
hardness within a typical range of 7.5 to 17.0 grains per
gallon. Consult the factory when heating potable water
exceeding these specifications. Damage to the heat
exchanger as a result of scaling or corrosive water
conditions in non-warrantable.
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