54
5) Ensure that a properly sized system pump is
installed with an expansion tank.
6) Check system pressure. Ensure a minimum of
18-20 PSIG with the system hot and not more
than 90% of the rated pressure of the relief
valve.
7) Review the installed gas piping from the meter
to the boiler. Ensure that the gas pipe, meter
and any regulators are adequately sized.
8) Review the field wiring and electrical service
for the boiler controls. Ensure that the electrical
service(s) is adequately sized.
9) Fill the condensate collector with fresh water
until water begins to pour out the drain.
10) Ensure that the boiler condensate drain and all
vent system condensate drains are properly
routed to an acceptable floor drain.
Boiler Set-Up
1) Ensure that the boiler and piping system are
full of water. Bleed all air from the pump
housing and secondary loop.
2) Check system for any water leaks.
3) Check system for installation of glycol or water
treatment where required. Where glycol has
been used to maintain the temperature rise
across the appliance confirm that the
recommended flow for pure water has been
increased by 15% and the head loss by 20%
while maintaining a 30-35
o
F rise across the
heat exchanger.
Boiler Operational Checks
1) Turn the boiler m
ain power switch to the “ON”
position.
2) Verify operation of the text display on the front
panel.
3) Program the adjustable points.
4) Push the reset button if a manual reset error is
displayed.
5) Install a manometer on the gas supply to the
boiler and verify minimum gas supply pressure
as the burner fires at 100% of rated input.
6) Verify operation of safeties as necessary (low
water cut-off, high limit, gas pressure, etc.).
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.
10.8
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.
10.9
DOMESTIC HOT WATER WITH PLATE
HEAT EXCHANGER
The piping between the plate heat exchanger in the
DynaMax HS 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 HS 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 HS 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.
10.10 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 HS 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 20 and 21.
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
Summary of Contents for DynaMax DMH201
Page 2: ......
Page 70: ...62 PART 14 EXPLODED VIEW PARTS LIST DYNAMAX HS WALL HUNG 10 May be located outside cabinet...
Page 71: ...63 DYNAMAX HS FLOOR MOUNT 10 May be located outside cabinet...
Page 77: ...69 11 6 Front Strut 14 8037 X X Not shown in Exploded View Part Recommended spare parts...
Page 78: ...70 PART 15 ELECTRICAL DIAGRAMS 15 1 DM 200 299 INTERNAL WIRING DIAGRAM...
Page 79: ...71 15 2 DM 399 800 INTERNAL WIRING DIAGRAM...
Page 80: ...72...
