Raypak VERSA IC, Installation & Operating Instructions Manual

Page: 47 / 80

47
User Test
This test is accessible from the TOOLBOX menu on
the VERSA IC
®
Display. “USER TEST” is displayed on
the first line of the display and “OFF” is shown on the
second line. “USER TEST” remains on the first line of
the display throughout this testing mode. Only the
second line of the display changes to show the state of
operation. When this functionality is enabled (push the
UP button on the membrane switch), the system
begins a system-wide test of the heater. “STRT”
appears on the display, then the system pump is
enabled (and the display shows “SYS”).
After approx. 10 seconds, the DHW pump is enabled
(and the system pump disabled) and the display
shows “DHW”. Approx. 10 seconds later, the boiler
pump is enabled along with the system pump (the dis-
play shows “PMP1”). After approx. 10 more seconds,
the display will show “Boil 1” which initiates a CFH for
this User Test.
If the heater is enabled to run, the heater will go
through a normal trial for ignition and light. If ignition is
successful, the display will show “MIN1” and the
heater will operate at minimum firing rate. Pushing
the UP button on the membrane switch will hold the fir-
ing rate at this level as long as desired and the display
will flash “HOLD” at 1-second intervals during this peri-
od of time.
Pressing the UP button again will step the program to
ramp up the firing rate to maximum input and “MAX1”
will display. Pressing the UP button again will hold this
NOTE: If the heater outlet temperature approaches
the PIM™ Hi-Limit value, the heater will ramp down
the firing rate to keep the temperature in a safe oper-
ating range.
VERSA IC
®
will automatically adjust the target differ-
ential during each cycle as needed to prevent short
cycling of the burner while also trying to maintain the
system supply temperature as close to target as is
possible. The user can select via DIP switch #1 on the
PIM™ to disable the auto differential function and set
a fixed differential. Typically a manual differential is
suggested when operating at elevated temperatures
near the limit of the appliance. This is done to prevent
overshooting the temperature so as not to trip the
manual reset high limit. The manual differential is
adjustable from 2°F to 42°F and is split equally above
and below the target temperature.
Minimum Run Time
The VERSA IC
®
Control system attempts to maintain
a minimum run time of 210 seconds for each heater.
This is accomplished several ways automatically by
the control system. One method is by automatically
adjusting the differential (Auto DIFF) used around the
target temperature and another is by extending the
OFF time of the burner to achieve longer ON times.
However, should the temperature exceed the one half
the calculated differential above the target tempera-
ture, the heater will shut down. Conversely, if the
system temperature exceeds the full differential below
the target temperature, the heater will fire to achieve
the set-point.
Outdoor Sensor Fault Operation
If the Outdoor Sensor is open (OPN) or shorted (SHT),
the alarm will signify the fault, but the boiler will contin-
ue operation and set the TARGET temperature based
on an outdoor temperature of 32°F.
System Sensor Fault Operation
If the System Sensor is not functioning, the heater will
alarm to signify the fault but will still operate to achieve
target based on the Outlet Sensor. The boiler pump
will be enabled to run continuously during this fault to
ensure water flow is moving past the active outlet sen-
sor.
Field Test
Whenever the heater is IDLE or in lockout, pressing
and holding the test/reset button on the PIM™ (or the
reset button on the heater membrane switch – if pres-
ent) for a period of 5 seconds shall initiate a field test
mode. The PIM™ will light the amber Alarm/Test LED
indicator and sequentially turn on the pump outputs for
a minimum of 10 seconds each. Pressing and holding
the test button (or reset button) for at least one second
will cancel the field test and the PIM™ Alarm/Test LED
shall be turned off.
Number
Field
Output Action
SYS System Pump relay turns on.
DHW DHW Pump relay turns on.
PMP 1 System and Boiler Pump relays turn on.
Boil 1 Ignite Boiler Burner.
Min 1 Hold Boiler at Min Fire.
Max 1 Ramp Boiler to Max Fire and hold.
Table L: User test pumps operation