18
PART 5
ELECTRICAL &
CONTROLS
IT IS EXTREMELY IMPORTANT THAT THIS UNIT BE
PROPERLY GROUNDED!
5.1
ELECTRICAL CONECTIONS
Minimum 120VAC 60Hz single phase (15A circuit) is
required for the DynaMax models DM-080 through DM-750.
The appliance, when installed, must be electrically grounded
in accordance with the requirements of the authority having
jurisdiction or in the absence of such requirements, with the
latest edition of the National Electrical Code ANSI/NFPA No.
70. When the unit is installed in Canada, it must conform to
the Canadian Electrical Code, C22.1, Part 1 and/or local
Electrical Codes.
•
All wiring between the appliance and field installed
devices shall be made with wire having minimum 220ºF
(105ºC) rating.
•
Line voltage wire exterior to the appliance must be
enclosed in approved conduit or approved metal clad
cable.
•
The pump must run continuously when appliance is
being fired.
•
To avoid serious damage, DO NOT ENERGIZE the
appliance until the system is full of water. Ensure that all
air is removed from the pump housing and piping before
beginning initial operation. Serious damage may result if
the appliance is operated without proper flow.
•
Provide the appliance with proper overload protection.
5.2
HIGH LIMIT
A manual reset fail-safe high limit aqua-stat control is located
at the back of the appliance and the control bulb is installed
in a dry well in the heat exchanger outlet. The setting of this
control limits maximum discharge water temperature to
210
o
F. The temperature of the outlet water in the heat
exchanger must drop a minimum of 30°F (16.7°C) belo w the
setting of the high limit control before the reset function can
be activated.
5.3
DYNAMAX CONTROLLER
This appliance uses a direct spark ignition control system.
The operation of the DynaMax Controller for the direct spark
igniter proves the presence of main flame using a flame
sensor proof current (1.25µA). A status point alarm of Flame
Fail will be displayed on the main panel if the boiler fails to
light after three (3) ignition attempts.
Figure 19: DynaMax Controller
Table 14: Connector Description
Connector
Connector Description
J2
Provides 120V to the DynaMax
Controller
J6
3-Way Diverter Valve
J7
On-Board Pump
J13
High-Limit, Gas Valve, Flame Sensor
J9
Fan Power, Fan Modulation
J5
Various Sensors
J16
Safety Switches
J12
Spark Return Signal
T2
Spark Igniter
F1
3.15A Fuse
5.3.1
SERVICE PARTS
The DynaMax Controller is not repairable. Any modification
or repairs will invalidate the warranty and may create
hazardous conditions that result in property damage,
personal injury, fire, explosion and/or toxic gases. A faulty
direct spark igniter MUST be replaced with a new factory
part. DO NOT use general purpose field replacement parts.
Each appliance has one DynaMax Controller, one direct
spark igniter and one flame sensor. A list of recommended
spare parts is available.
5.3.2
IGNITION MODULE LOCKOUT FUNCTIONS
The DynaMax Controller may lockout in either a hard lockout
condition requiring pushing the reset button to recycle the
control for a CSD1 requirement or a soft lockout condition. A
typical hard lockout fault for the DynaMax Controller is a 3
trial ignition failure condition. Pushing the reset button on the
control panel is the only way to reset the DynaMax Controller
that is in a hard lockout condition. The reset button is active
after the post purge cycle when there is a lockout condition
as indicated by the LCD display. Turning the main power
“OFF” and then “ON” or cycling the thermostat will not reset
a hard lockout condition. Wait five seconds after turning on
the main power before pushing the RESET button when the
DynaMax Controller is in a hard lockout condition. Wait for
the status LCD display to refresh indicating that the
DynaMax Controller is ready before releasing the reset
button.
The DynaMax Controller will go into a soft lockout condition,
for example, if the supply sensor is disconnected, flow
switch, LWCO or air switch are not made. If the fault is not
corrected, the boiler will stay in the soft lockout state. Once
the fault is corrected, the boiler will automatically return to
normal operating state
5.4
ERROR TABLE
The following tables provide a description of all the possible
errors with the DynaMax boiler. Errors can be divided into
two groups. Soft lockout errors (will disappear when error is
gone) and hard lockout errors (can only be reset by the
RESET button). A soft lockout error will be indicated with an
‘E’ prior to the error number. A hard lockout lockout error will
be indicated with an ‘A’ prior to error number.
When the control is in error the pump will be running. This is
done to prevent the freezing of the central heating circuit
when the boiler is in error during the winter period. For some
non volatile lockouts the pump will not be running, see table
below for more details.
Summary of Contents for DMC 753
Page 20: ...16 ...
Page 63: ...59 PART 14 EXPLODED VIEW PARTS LIST DYNAMAX WALL HUNG ...
Page 64: ...60 DYNAMAX FLOOR MOUNT ...
Page 71: ...67 PART 15 ELECTRICAL DIAGRAMS 15 1 DM 80 250 INTERNAL WIRING DIAGRAM WALL HUNG MODELS ...
Page 72: ...68 15 2 DM 210 750 INTERNAL WIRING DIAGRAM FLOOR MOUNT MODELS ...