Camus Hydronics DRW1000, Installation And Service Manual

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7
purge timer is satisfied. Once complete the Dynaforce® will
target the ignition fan speed.
9
DR 300 – DR 2500 (Direct Ignition):
The hot surface igniter
will be energized for 22 seconds followed by energizing the
main valve for 4 seconds. A signal of 0.8dVdc must be
recognized by the controller at the flame sensor to keep the
main gas valve in an open position. The fan is kept at
ignition speed until the stabilization timer is satisfied.
DR 3000 – DR 5000 (Proven Pilot): The Dynaforce®
controller will activate the hot surface igniter for 22 seconds
followed by powering the pilot valve for 10 seconds,
whereupon a signal of 0.8Vdc must be recognized by the
controller at the flame sensor to keep the main gas valve in
an open position. The fan is kept at ignition speed until the
stabilization timer is satisfied.
10 If the flame signal is not reached the module will stop the
ignition sequence after the trial for ignition.
11 The fan speed will slowly decrease as the heat request
nears the heat demand. The modulation rate is controlled
via Pulse Width Modulation (DR300 – 800) and a 4-20mA
signal (DR1000 – 5000). If the heat demand is sustained for
a long duration of time the boiler will get to a point of steady-
state and the fan will rotate at constant speed.
12 When the heat demand is satisfied or is removed the burner
will shut off and the fan speed will ramp up to the preset
Post-Purge speed until the Post-Purge timer is satisfied.
13 The pump continues to circulate until the post-purge time is
satisfied.
14 The boiler will then go into Standby as it waits for the next
heat demand.
Figure 3: Dynaforce® Ignition Cycle
Note:
1. If a flame signal is detected at the end of the pre-purge
period an error statement to that effect will appear.
2. If at the end of the safety period (6 sec) no flame is
detected the control will go to post-purge to remove the
unburned gas. After this, a re-ignition attempt is started
following the same cycle. The number of re-ignition
attempts is limited to 2 after which a lockout occurs.
3. The burner can only be on continuously for a period of 24
hours. After this the burner is switched off and a restart
sequence follows.
4. The hot surface igniter is de-energized at the end of the
ignition period to allow for ionisation detection.
1.4.1 HEAT TRANSFER PROCESS
1 Burner input continues to increase until water temperature
reaches the set point temperature.
2 Burner input may stabilize at a fixed rate when demand
equals input.
3 Burner input will decrease rate when water temperature
approaches temperature set point.
1.4.2 END OF SEQUENCE
1 Set point temperature is satisfied.
2 Power to the gas valves is turned off.
3 Combustion air fan ramps to a stop over the factory
preprogrammed time period of 60 seconds.
4 Thermostat is now in a standby mode waiting for the next
“Call for Heat”.
WARNING
To minimize the possibility of serious personal injury, fire or
damage to your appliance, never violate the following safety
rules.
WARNING
IMPROPER INSTALLATION, ADJUSTMENT,
ALTERATION, SERVICE OR MAINTENANCE can cause
injury or property damage. Refer to this manual. For
additional information, consult a qualified installer, service
agency or gas supplier.
DO NOT
Do not use this appliance if any part of it has been under
water . The possible damage to a flooded appliance can be
extensive and present numerous safety hazards. Any
appliance that has been under water must be replaced
WHAT TO DO IF YOU SMELL GAS
Do not try to light any appliance. • Do not touch any electric
switch: do not use any phone in your building. • Immediately
call your gas supplier from a neighbor’s phone. Follow the
gas supplier’s instructions. • If you cannot reach your gas
supplier, call the fire department.
IMPORTANT
Consult and follow local Building and Fire Regulations and
other Safety Codes that apply to this installation. Contact the
local gas utility company to authorize and inspect all gas and
flue connections.
Installation and service must be performed by Camus®
qualified factory trained service technicians.
WARNING
Should overheating occur or the gas supply fails to shut off,
DO NOT turn off or disconnect the electrical supply to the
pump. Shut off the gas supply at a location external to the
appliance.
• Boilers and water heaters are heat producing appliances.
To avoid damage or injury, do not store materials against
the appliance or the vent-air intake system. Use proper care
to avoid unnecessary contact (especially children) with the
appliance and vent-air intake components.
• Never cover your appliance, lean anything against it, store
trash or debris near it, stand on it or in any way block the
flow of fresh air to your appliance.
•
UNDER NO CIRCUMSTANCES
may flammable materials
such as gasoline or paint thinner be used or stored in the
vicinity of this appliance, vent-air intake system or any
location from which fumes could reach the appliance or
vent-air intake system.
• A gas appliance that draws combustion air from the
equipment room where it is installed must have an
adequate supply of fresh air circulating around it during
burner operation for proper gas combustion and proper
venting.
1.5 CODES
The equipment shall be installed in accordance with those
installation regulations in force in the local area where the
installation is to be made. These shall be carefully followed in
all cases. Authorities having jurisdiction shall be consulted