Camus Hydronics DFH1100 Installation, Operation And Service Manual - page 37
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service clearances.
2
Review Part 2 Venting. Ensure that all vent
components are fabricated from the correct
category of materials with adequate clearance
from combustibles.
3
Ensure that the boiler condensate drain and
all vent system condensate drains are
properly routed to an acceptable floor drain or
neutralization system.
4
Review the vent termination point for proper
location and clearances.
5
Ensure that proper volumes of combustion
and ventilation air are provided to the
mechanical room. If a separate combustion
air pipe is used, ensure that it is properly
sized, sealed and terminated.
6
Review the water piping from the boiler to the
system. The boiler must be installed in a
primary/ secondary piping system. Review the
diameter and equivalent length of the installed
piping to and from the boiler to ensure proper
flow.
7
Ensure that a properly sized primary system
pump is installed with an expansion tank.
8
Check system pressure. Ensure a minimum of
30 PSIG with the system hot and not more
than 90% of the rated pressure of the relief
valve.
9
Review the installed gas piping from the
meter to the boiler. Ensure that the gas pipe,
meter and any regulators are adequately
sized.
10 Review the field wiring and electrical service
for both the boiler controls and pump. Ensure
that the electrical service(s) is adequately
sized.
Boiler Set-Up
1
Ensure that the boiler and piping system are
full of water. Bleed all air from thepump
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%.
4
Turn on power to the primary system pump
and the appliance secondary pump and verify
operation.
Boiler Operational Checks
1
Turn the boiler main power switch to the “ON”
position.
2
Verify operation of the Fuji and Diagnostic
Display.
3
Program the adjustable points.
4
Turn the switch to the “ON” position to start
boiler operation.
5
Push the resets for low water level, high water
temperature and flame failure.
6
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.
7
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 down to 20% of rated input
on initial start-up and adjust input as required
to meet system demand.
3
Ensure that inlet water temperature does not
fall below 110°F (43.3°C).
4
Based on system demand, the appliance will
modulate accordingly.
5
As system demand is satisfied, the burner will
cycle off and the combustion air fan will
decelerate at a pre-programmed rate before
the appliance shuts down.
11.6
DOMESTIC HOT WATER HEATER
Hot water heaters are designed for installation with a
storage tank. The operation of the properly sized circulating
pump, 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.
11.7
WATER VELOCITY CONTROL
To ensure proper velocity through the heat exchanger(s), it
is necessary to select the proper pump. Temperature rise
at full fire will be an indication of flow. This must be done
on initial installation and periodically rechecked.
Excessive lime/scale build-up in the heat exchanger tubes
is a result of restricted flow and too little velocity in the
tubes. Excessive pitting or erosion in the tube is caused by
high water flow and too much velocity through the tubes.
Care should be taken to maintain required water velocity
based on water condition as follows:
11.8
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 water
heater or hot water supply boiler in the off cycle, the
Return/Inlet temperature and Supply/Outlet
temperature readings on the SmartFlame display
should read approximately the same temperatures.
3
Turn the hot water heater 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 SmartFlame
display with the required temperature rise at the
required flow rate based on water condition (Soft,
Normal, and Hard). 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 all valves are open between the hot water
heater and the storage tank. Ensure that all ball valves
are fully ported.
4
Check the pump to be sure it is running properly and
that the pump motor is running in the proper direction.
5
Be sure the pipes between the hot water heater and
storage tank are not more than a total of 80 equivalent
feet between supply and return lines. If maximum