Raypak VERSA IC, Инструкция по установке и эксплуатации

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56
Wiring the Thermostat
Connect the Enable/Disable terminals to the PIM™
(shown in Fig. 11) or to the low-voltage field wiring ter-
minals (model dependent). Alternately, any dry contact
closure (including a remote thermostat) across these
terminals will enable the unit to run. Caution should be
used to ensure neither of the terminals becomes con-
nected to ground.
Wiring the Outdoor Sensor
1. There is no connection required if an outdoor sen-
sor is not used in this installation.
2. If using an Outdoor Sensor, connect the sensor
wires to the terminals marked OUTDOOR SEN-
SOR (PIM™ J2 connector terminals 5 and 6) refer
to page 51 figure 34. Caution should be used to
ensure neither of these terminals becomes con-
nected to ground.
3. Use a minimum 18 AWG wire for runs of up to 150
feet.
4. Mount the outdoor sensor on an exterior surface of
the building, preferably on the north side of the
building in an area that will not be affected by
direct sunlight and that will be exposed to varying
weather conditions.
Wiring the Indirect Sensor
1. There is no indirect sensor connection required if
an indirect water heater is not used in the installa-
tion.
2. When the Indirect DHW call-for-heat is active, the
PIM™ communicates this to the VERSA
®
Control.
The VERSA
®
Control calculates the optimal oper-
ation and sends the firing rate and pump output
requests to the PIM™ so it can activate the
Indirect DHW pump and Boiler pump if needed. If
an optional Indirect DHW sensor is connected, the
PIM™ will pass this signal to the VERSA
®
Control.
This allows the VERSA
®
Control to optimize the
Indirect DHW demand to maintain the Indirect
DHW setpoint. The Indirect DHW thermostat must
be closed for proper operation when using the
Indirect DHW sensor. It is recommended that a
tankstat be used as a limiting device in conjunction
with a tank sensor and wired to the Indirect DHW
connections at the PIM™, or install a jumper
across the Indirect DHW override terminals and
set PIM™ operator dial to be equal to DHW Target
temperature to prevent an over-temperature con-
dition from occurring. If a VERSA
®
Control is not
present, the PIM™ shall activate the Indirect DHW
pump whenever the Indirect DHW call is active.
The Boiler pump may also be activated based on
the Indirect DHW piping configuration setting.
3. Connect the indirect tank sensor to the terminals
marked INDIRECT DHW SENSOR (see wiring
diagram). Caution should be used to ensure nei-
ther of these terminals is connected to ground.
Energy Mangement
System Setup
Temperature or Rate Control using
an external 0–10VDC or 4-20mA
control signal
1. A signal from an energy management system can
be used to control either the setpoint temperature
or the firing rate of the heater.
2. To enable this remote control function, set DIP
switch #5 on the PIM™ to the UP position. DIP
switch #5 toggles between an EMS ON (UP) sig-
nal or a demand signal from the VERSA
®
Control
OFF (DOWN). Using DIP switch #2 on the PIM™,
select between Direct Drive (UP) or Target
Temperature (DOWN) setpoint /Firing rate.
3. For use of a 4-20mA signal, DIP switch #6 must be
in the ON (UP) position and a 500 OHM 1/2 watt
resistor wired in parallel across the input wires.
4. Connect an Energy Management system or other
auxiliary control signal to the terminals marked
0-10V (+/-) on the PIM™ (see Fig. 11). Caution
should be used to ensure that the +0-10V connec-
tion does not create a short to ground.
• Temperature Control: Remote target tempera-
ture can be used in both single-boiler
applications as well as multi-boiler cascade to
provide target temperature. When configured to
allow an energy management system to provide
a target temperature input to the VERSA IC
®
Control, the control requires both a contact clo-
sure across the enable/disable connection as
well as a DC voltage input to allow the boiler to
fire. The minimum voltage required to operate
the burner is 1.0 VDC (5.6mA) and equates to a
target temperature equal to 50 °F or Target Min
setting in the adjust menu. 10 VDC (20mA)
equates to the max alowable setpoint for the unit
based on the PIM™ value (XFyre 192°F, XPak-
FT 192°F, MVB / XTherm 220°F). The TARGET