Camus Hydronics DMC 753 Installation, operation and service manual - page 5
1
PART 1
GENERAL
INFORMATION
1.1
INTRODUCTION
The DynaMax boiler is a fan assisted boiler based on a
push through design which offers several venting options.
Heat output is controlled by a one to one air/gas ratio
control gas valve which provides seamless modulation. The
boiler provides central heating, domestic hot water or
combination heating with DHW priority at working pressure
up to 160 PSI. It is designed for use with a fully pumped
and pressurized water system. The boiler/water heater will
automatically modulate to provide heat outputs from 100%
down to approximately 20% of rated input.
The DynaMax utilizes a negative pressure gas valve. The
operation of the fan will generate a negative pressure in the
venturi, which draws in a matching amount of gas through
the valve.
During operation the DynaMax maintains a steady state
efficiency across the entire range of modulation. Air and
gas are metered in precise proportion (1:1 Ratio) allowing
combustion characteristics which determine efficiency to
remain the same over the entire operating range.
The DynaMax is designed so that all of the sensible heating
value and most of the latent heat is being transferred to the
water.
1.2
SPECIAL INSTRUCTIONS TO OWNER
This manual supplies information for the installation,
operation and servicing of the appliance. It is strongly
recommended that this manual be reviewed completely
before proceeding with an installation
CAUTION
It is important that all gas appliances are installed by a
qualified installer/technician that is trained by Camus
Hydronics. It is in your own interest and that of safety to
ensure that all local codes, and all the following “NOTES”
and “WARNINGS” are complied with.
Installing, servicing or adjusting this appliance should be
performed only by a qualified installer/technician that is
trained by Camus Hydronics. The serviceman must utilize a
combustion analyzer with CO
2
, CO, and draft gauge, to set
the appliance according to Camus Hydronics’
recommendations, prior to commissioning.
NOTE
RETAIN THIS MANUAL FOR FUTURE REFERENCE
1.3
CHECKING EQUIPMENT
Check for signs of shipping damage upon receiving
equipment. Pay particular attention to parts accompanying
the boiler, which may show signs of being hit or otherwise
being mishandled. Verify total number of pieces shown on
packing slip with those actually received. In case there is
damage or a shortage, immediately notify carrier.
1.4
DISPLAY UNIT
The display unit will indicate status and will display selected
temperature. Refer to Part 9 DynaMax Control Panel, which
provides details to modes and error codes displayed on the
appliance.
1.5
SEQUENCE OF OPERATION
1) The power switch is placed in the “ON” position.
2) Minimum 120 VAC 60Hz single phase (15A circuit) is
supplied to the DynaMax Field Connection Board.
3) 120 VAC power is supplied to the DynaMax Controller
which provides all setup and ignition control functions.
4) Access to settings is through the use of a LPT1/ USB
cable using a laptop computer through the LPT1 port
on the DynaMax Control Panel.
5) After the appliance water pump starts, flow is proven
by the flow proving device. The normally open dry
contacts in the low water cutoff (LWCO), if supplied, is
to be wired in series with the normally open contacts of
the flow proving device. (Refer to Figure 18, page 18 of
this Manual)
6) Locate the probe type LWCO in the piping at least 3
feet above the boiler inlet/outlet connection. In all
cases check with local codes.
7) Depending on the selected mode, the appliance
operates as a master or slave configuration.
8) The DynaMax Controller initiates a start-up sequence
once it receives a heat demand.
9) The DynaMax Controller energizes the on-board pump
and starts to ramp up the voltage to the electrically
commutated DC motor of the combustion fan.
10) The fan will run at Pre-Purge speed until the Pre-Purge
timer is satisfied. Once this is complete the DynaMax
Controller provides a signal to modulate down to
ignition fan speed.
11) The DynaMax controller goes through internal safety
checks and if this is satisfied the ignition sequence
begins.
12) The DynaMax Controller supplies voltage to the air/gas
ratio control valve. The air/gas ratio control valve
senses the pressure across the venturi and supplies
gas to pre-mix with air.
13) The igniter will continue to spark for 6 seconds, with
the gas valve opened, and the fan running at ignition
speed.
14) Spark Igniter lights the air/gas mixture. The DynaMax
Controller looks for a minimum flame rectification
signal of 1.25 µA DC from the flame sensor. If the
signal is present the DynaMax Controller will allow the
gas valve to remain open. The burner is now firing at
starting input rate.
15) The boiler will modulate to the correct fan speed to
meet the heat demand. The modulation rate is
controlled via Pulse Width Modulation (PWM) signals
provided by the DynaMax Controller.
16) The fan speed will slowly decrease as the heat request
nears the heat demand. 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 a
constant speed.
17) 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.
18) The boiler will then go into Standby as it awaits for the
next heat demand.