Electric Power Supply; Connecting The Circulating Pump; Connecting The Thermostat - Dettson HYDRA COMPACT HYDRAC03-M2401M Guide D'installation Et Manuel Du Propriétaire

2. Install the drain valve and the safety valve according to the
mounting configuration as shown in Figure 1;
3. An air vent should be installed on the unit if installed upside
position, water connections at the bottom. In all other mounting
position, cork the hole with the ¼'' plug provided.
4. Install the water supply and return piping with the 1" NPT fitting;
5. The heating supply line must include:
a. 1 circulator along with 2 maintenance valves;
b. 1 automatic pressure reducing valve adjusted to 12 psi,
with a shut-off valve on the return water line;
c. 1 expansion tank;
d. 1 automatic vent.
6. The flow of water through the system must be sufficient to
continuously discharge the energy generated by the boiler. If
not, the High Limit protector will disconnect all the electric
elements and a more or less frequent cycling mode will be
established by the Safety Control (see the Technical
Specifications Table);
7. In order to ensure satisfactory water flow, the friction in the
piping system must not exceed the capacity of the circulator;
8. After having completed all piping connections, run water
through the system and purge the air. The automatic vent
should be in operation.
Note: Remove the plastic cover and check to see if the elements
are watertight.
1.8)

ELECTRIC POWER SUPPLY

All electrical wiring must conform to the standards and regulations in
force and the Canadian Electrical Code CSA C22.1.
Electrical power to the boiler must come from a 120/240V-60 Hz or
208V-60 Hz, single phase, 3-wire, grounded circuit, protected by an
appropriately sized breaker, based on the total rating of the boiler.
When using 208V, change the connector's position at the primary of
the transformer. Refer to the boiler nameplate and the technical
specifications in this manual to select the proper breaker and 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. A ground terminal is 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)
1.8.1)

CONNECTING THE CIRCULATING PUMP

Connect the circulating pump on 120V connections points identified
P-P in the control panel as shown in Figure 2. The control is
designed to operate the circulator on thermostat demand or
continuous flow when the continuous flow switch, on the side of the
unit, is ON.
1.8.2)

CONNECTING THE THERMOSTAT

Single heating zone
Connect the low voltage thermostat to R-W terminals located inside
the control panel. See Figure 4.
Multiple heating zones
Connect the contacts of the motorized valves or pump controls to R-
W terminals inside the control panel. See Figure 5 and 6.
5