Install Instructions

3
The pump has built-in over current fuse protection, temperature
protection and basic overvoltage protection. It does not require
additional overload protection devices unless required by local
electrical codes. Power supply cabling should be capable of car-
rying rated power and be properly fused. Ground lead connection
i
s essential for safety and should be connected first. Grounding is
only meant for pump safety. System piping should be grounded
s
eparately. A ferrite core is supplied in a separate bag. Electronic
cabling and wires, by virtue of their length-to-width ratios, are per-
f
ect natural antennas. The ground, line and neutral power supply
wires should go through the ferrite core to help reduce unwanted
h
igh-frequency interfering signals. The pump should not be oper-
ated without the electrical cover securely attached.
4.3 Relay Connections:
The pump is supplied with normally open, normally closed and
common relay connections. See Section 9.2 Electrical Data for
specifications. These can be used to activate or deactivate a pri-
mary or secondary pump or alarm contact, actuate a damper for
combustion air or switch another piece of equipment. Factory
default is activation of relay on fault. Additional relay “triggers” are
standby, I2 activation and run digital input commands.
4.4 Digital Inputs:
The pump can be switched between standby mode or maximum
power via the digital inputs.
4.4.1 Pump External Control Wiring Diagrams:
The following diagrams are examples of external control wiring to
digital inputs I1 and I2.
4.4.2 External Control Settings:
On/Off/Standby/Max speed external control variances and sub-
sequent effects are listed in the chart below. Refer to Section 6.5
Pump Settings to modify digital input and relay settings from fac-
tory defaults.
4.5 Constant 24 Volt DC Power Supply:
There is a constant, unswitched 24Vdc/100mA output power supply
across terminals 24V/0V. This power is interrupted only if the main
power supply to the Viridian is turned off.
5. REGULATION MODES:
Pump defaults to provide 23 feet (7m) of head with variable dif-
ferential pressure (∆p-v) regulation. If the factory settings are not
suitable they can be modified over an Ethernet connector or a
web interface. Various regulation parameters (constant head, sup-
ply power, rpm limit) can adjust the head and flow characteristics
until the pump achieves desired response to suit the application.
5.1 Constant Pressure Control (∆ p-c):
Electronic regulation can provide
constant head by modifying
power input and is set with the
Limit head (Hmax) setting. The
duty point of the pump will move
l
eft and right along a constant-
pressure curve based upon the
w
ater demand in the system. The
pump head (pressure) is kept con-
s
tant, irrespective of the water
demand. Hmax proportional to Q
needs to be set to 0% (see
Section 6 Connection to a
Network - Pump Setup).
Selecting the constant pressure regulation is beneficial when the
Viridian is installed in a system where there is a much lower resis-
tance (friction loss) in the main distribution loop compared to the
resistance in the transfer part of the system (i.e. baseboard radia-
tion, radiant floors, terminal units). For example, this characteristic
of generally lower head loss can be found in converted gravity sys-
tems, systems operating with large temperature spreads or where
the pump is moving the total volume of flow through the boiler and
distribution lines.
5.2 Variable Differential Pressure Control (∆ p -v)
- Factory Default Setting:
Additional energy savings and
noise reduction is achieved with
proportional head regulation that
also compensates for changes in
system friction losses during peri-
ods of changing flow rates. In this
mode the pump head changes
continuously as the demand for
water changes, reducing as the
water demand declines and
increasing as the water demand
rises.
The Hmax proportional to Q set-
ting provides a user adjustable curve slope. An Hmax propor-
tional to Q of 0% means that the head does not exhibit any
dependence to flow and should not exhibit noticeable change
until maximum power is reached. An Hmax proportional to Q set
to 60% means that the pressure will drop for 60% from set value
when there is no flow. For example if the head is set to 20', the
pump will only provide 12' when the valves are closed and the
pump is dead headed (operating at zero flow). The factory default
is 23' at 50%. Note, a substantial percentage of glycol in the mix-
ture can influence regulation.
Select the variable differential pressure control when the Viridian is
installed in a system where there is a much higher resistance (fric-
tion loss) in the main distribution loop compared to the resistance
in the transfer part of the system (i.e. baseboard radiation, radiant
floors, terminal units). For example, this characteristic of the pri-
mary circuit having a high pressure drop can be seen in systems
using modulating condensing boilers or heat exchanges, heavily
throttled branch shut-off valves, where the distribution lines are
long or in two pipe systems with thermostatic or zone valves.
FACTORY DEFAULT FUNCTION
I1 (IO1/0V)
Normally open or 2Vdc and less, pump runs normally.
Closing contact (or applying 8Vdc or above) sets the
pump to standby mode by disabling power to the motor
(eg: for Warm Weather Shut Down). Additional I1 input
signals are maximum power (speed) and no effect.
I2 (IO2/24V)
Closing I2 or 8Vdc and above (only when I1 is closed)
forces the pump to run at Max (eg: purge system of air
on start-up). Has no effect if I1 is open. Additional I2
input signals are run and no function.
0
IO2
24
IO1
DC Source
IO1 “Open”
IO2 “Open”
IO2 “Closed”
IO1 “Closed”
Pump Control Using Switches or Other
“Dry” Contacts Such as a Relay
0
IO2
24
IO1
IO2
> 8 Vdc = “Closed”
< 8 Vdc = “Open”
DC Source
IO1
> 8 Vdc = “Open”
< 2 Vdc = “Closed”
Pump Control Using a DC Source Such as
From a BMS or Other Controlling
Voltage Source
Note: Maximum voltage on the IO terminals
is not to exceed 32 Vdc
H
H
set
Q
CONSTANT
PRESSURE
CONTROL
H
H
set
H
set
2
Q
PROPORTIONAL
PRESSURE
CONTROL