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appropriately sized breaker, based on the total rating of the
boiler.
Refer to the boiler nameplate and the technical
specifications in this manual, Table 3, to select the proper
breaker and determine the wire size.
WARNING
RISK OF FIRE.
The conductor sizing must conform to the last edition of
the local or national codes.
Failure to follow this rule can result in death, bodily
injury and/or property damage.
Power supply to the unit can be made using copper or
aluminum wires.
The wire size must be decided in
accordance to unit power consumption, the over current
protection type and capacity, the wire type and length, and
the environment where the unit is installed. If an aluminum
wire is used, other precautions (such as the use of a DE-OX
inhibitor) must be taken to insure the conformity of the
installation. In all cases, all the factors affecting the wire
gauge must be considered and the installation codes
followed.
The exterior of the unit must have an uninterrupted ground to
minimize the risk of bodily harm.
supplied with the control box for that purpose.
In the event that wires inside the unit require replacement,
these must be as same type as originals. (Copper wiring
only).
2.7.1
Connecting the circulating pump
The electronic circuit is designed in such a way that the
circulator functions based on demand by the thermostat, or if
a high limit condition is detected. Refer to Figure 4 for the
connecting of the circulating pump.
2.7.2
Connecting the thermostat
Single heating zone
Connect the low voltage thermostat to W1 and R terminals
located inside the control panel on the electronic board, as
represented on Figure 4.
Multiple heating zones
Connect the contacts of the motorized valves or pump
controls to W1 and R terminals inside the control panel on
the electronic board. See Figures 5 and 6.
The anticipator inside the thermostat must be adjusted
according to the electrical load connected to the thermostat.
2.7.3
Thermostat heat anticipator adjustment (if
required)
Certain thermostats are equipped with a heat anticipator that
must be adjusted according to the instructions supplied.
This is to ensure that the heating mode is comfortable and
economical.
Generally speaking, on a single stage thermostat, a reading
of the current must be taken with an ammeter as follows:
A ground terminal is
5
1.
Move the anticipator to its highest setting, rendering it
ineffective.
2.
Remove the wire from the "W1" terminal and connect an
ammeter between the terminal and the wire.
3.
Call for heat by raising the set point on the thermostat
and allow the boiler to run for 3 to 4 minutes to reach its
peak output.
4.
Once the current has stabilized, a reading should be
taken and the anticipator adjusted to that value.
longer heating cycles are desired, the anticipator can be
set to a higher value
2.7.4
Connecting the outdoor sensor
Mount the sensor on an outside wall, protected from direct
sunlight, so that it will accurately measure the outside
temperature. Install 2 only #20 wires between the outdoor
sensor and the terminals identified as S1 and S2 on the
electronic board terminal.
3.0
OPERATION
3.1
ADJUSTMENTS AND START-UP
CAUTION
The boiler must be filled with water and all air purged
from the system, before turning on the power.
If the power is turned on before the boiler is filled with
water, the elements will become seriously damaged and
the boiler warranty will be void.
1.
With the help of a small screwdriver, adjust the boiler
temperature screw on the board potentiometer located
on the control board, to between "90° F - 120° F - 15 0° F -
180° F - 210° F" (see Figure 1, item B);
Figure 1: Hydra Electronic Board
A: BOARD TERMINAL STRIP
B: POTENTIOMETER
C: TROUBLESHOOTING PORT
D: DIP SWITCHES FOR BOARD CONFIGURATION
E: FUSE 2A (AUTO-RESET)
2.
In the event that the modulating capacity feature of
the boiler is desired, an outdoor sensor will need to be
installed and wired onto the Hydra electronic board
(terminals S1 and S2). Once the outdoor sensor is wired
If
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