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Part Number PLUS-E017-A/1206
33
Manual • Installation • Start-Up • Usage • Maintenance • Parts
Start-up — Gas boilers onlyB4
Gas
Follow boiler manual
1. Follow all procedures in the Gas boiler manual
to start up and verify operation of the boiler.
Set space heating operation
Verify space heating mode
1. Press the “Mode” button until the display shows
“Para.” This is the parameter mode.
2. Press the “Step” button until the display first digit
shows “3.”
3. The last digit must show “1.” If any other number
displays, press the “+” button until “1” shows in the
right-hand digit. Press the “Store” button to save
this setting.
Set space heating target temperature
1. Press the control panel “Step” button until
the display first digit shows “4.” The right 3 digits
show the outlet water temperature setting.
2. Press the “+” or “-” button to change the setting to
the desired outlet water temperature. (The factory
default setting is 190 °F.)
a. Outdoor sensor installed — Setting is the target
temperature for outdoor temperature at or below
32 °F. At higher outside temperatures, the
PhD
control module calculates the target temperature. (See
Control Supplement for detailed discussion of
outdoor reset.)
When a summer/winter switch is used, closing the
switch will disable the boiler (space heating) circulator
during summer operation.
b. Outdoor sensor not installed — Setting is the target
temperature at all times.
3. Press the “Store” button to save the setting.
Water heater operation
1. The PLUS water heater thermostat must be con-
nected to low voltage terminal strip terminals 3
and 4 as shown on page 10.
2. When the water heater thermostat calls for heat,
the module shuts down the boiler circulator, acti
-
vates the water heater circulator and immediately
sets target outlet water temperature to 190°F. This
provides automatic priority heat allocation to the
indirect water heater for maximum response and
recovery.
3. The water heater circulator continues for 30 seconds
after the heating cycle to deliver the most possible
heat.
Water heater operation setup
1. Go to step 2 if the control is in Parameter mode
already. Press the “Mode” button until the display
shows “Para” (parameter mode).
2. Press the “Step” button until the display first digit
shows “2.”
3. The last digit must show “1.” If any other number
displays, press the “+” button until “1” shows in the
right-hand digit. Press the “Store” button to save
this setting.
4. The
PhD control module turns on the PLUS
circulator when the indirect water heater operating
control closes. The control module shuts off the
boiler circulator (stops space heating) during calls
for DHW heating.
Verify space heating operation
NOTE: “[ _ _ _ _ ]” in the following indicates the
characters that should show on the display panel.
“180” in the right 3 places means the display shows the
measured boiler water temperature. The number shown
will not necessarily be 180.
1. Turn down aquastat on PLUS tank. If necessary,
turn off power and remove one of the PLUS aqua
-
stat wires to ensure boiler will not receive a DHW
heat call.
2. Turn off power to boiler at service switch.
3. Wait a few seconds, then turn on power to boiler.
[A180] (self-check on power-up, for a few seconds)
[0180] (no call for heat)
4. Raise room thermostat to call for heat.
[5180] (blower/circulator on) The blower and boiler circu-
lator energize and the control checks for air flow.
[1180] (prepurge) After a few seconds delay (control self-
check), blower speed will increase to ignition speed.
The blower will run in prepurge for 10 seconds.
[2180] (ignition) After prepurge, the control module
opens the gas valve and starts ignition spark.
a. If burner flame proves within 4.5 seconds, burner
continues to fire. Burner will fire at start-up
rate — 50% of maximum input — for about 10
seconds to allow flame to stabilize.
b. If burner flame does not prove within 4.5 sec
-
onds, control module attempts ignition sequence
again. Flame must prove within 5 attempts or
control will lockout (display will show [
E 02]).
c. Verify flame failure operation by closing boiler
manual gas cock to prevent gas flow. Open
manual gas valve after testing.