Product Overview

48
103859-12 - 8/19
MPO-IQ
Installation & Service Manual
Call for
Heat
ZC and
ZR
Terminal
Function
(ZC_)
Boiler
Temp.
Boiler Status,
(B1 Output)
TT= on
-- < 140 Start with no delay
TT = on
-- >140
Start after 2 minute
delay
ZR = on ZC_ = ZR
<140 Start with no delay
ZR = on ZC_ = ZR
>140
Start after 2 minute
delay
ZR = on ZC_ = DH
<140 Start with no delay
ZR = on ZC_ = DH
>140 Start with no delay
D. USING THE OPTION PANEL
Option Cards are available from distributors and
are the simplest way to add functionality, safety and
efficiency to your heating system. The Option Panel
provides an easy and convenient means to "plug-in" an
Auxiliary High Limit, Low Water Cut-off and/or Outdoor
Reset function. For operating instructions, refer to the
instructions supplied with those cards.
E. USING THE OPTIONAL LCD DISPLAY KIT
(P/N 102728-01)
The LCD Display is an easy to use touch screen
type display that allows a technician to monitor and
adjust the Boiler Control and connected Option
Cards. All boiler settings, status and error codes are
displayed in full text. All Outdoor Reset Option Card
parameters are adjustable with graphic and help
information screens. The LCD Display Kit includes
a mounting bracket and a simple plug-in wiring
connection to allow mounting in the plastic hood
above the burner door.
For installation instructions, refer to the instructions
supplied with the display.
F. CHANGING THE ADJUSTABLE PARAMETERS
To adjust parameters such as the High Limit Setpoint
and High Limit Differential:
1. Using the Boiler Control display, access the
adjustment mode by pressing and holding the
Up , Down , and “I” keys simultaneously for
three (3) seconds. This procedure is intended to
discourage unauthorized changes or accidental
changes to limit settings.
2. Press the "I" key to display available Adjustment
Mode options. Select an option.
Adjustment Mode Options
HL_
140-240°F Adjust High Limit Setting
HdF
10-30°F Adjust High Limit Differential
ZC_ dh, ZR or ELL
ZC and ZR Terminal Function
Or_
0-10 minutes Pump Overrun Time
PP_
0-20 minutes Pump Pre-purge Time
St_
140 - 180°F Start Temperature
Pt_ On or Off
Priority Time
f-C F or C
Select degrees F or C Mode
bac
Back to Operating Mode
3. Press the Up  and Down  keys to adjust the
displayed setpoint to the desired value.
4. To return to the normal operating mode from
the Adjustment Mode, when the "bAc” option is
displayed, press either the Up ñ or Down  key.
If no keys are pressed, after five (5) minutes
the Boiler Control will automatically return to the
Operating Mode.
G. MORE INFORMATION ABOUT ADJUSTABLE
PARAMETERS
1. High Limit (HL_)
The Boiler Control is factory programmed with a
High Limit Setpoint of 180°F. The boiler turns "off"
when the boiler water temperature (bt) is above
this value. The High Limit setpoint is adjustable
between 140° and 240°F. The Operating Setpoint
(SP) will equal the High Limit Setpoint unless
an Outdoor Reset Option Card is installed.
The Outdoor Reset Option Card reduces the
Operating Setpoint to regulate heat delivery,
increase home comfort and save energy. Refer
to Appendix A for additional information.
2. Differential (HDF)
The Boiler Control is factory programmed with a
Differential of 15°F. The Differential is the number
of degrees the boiler temperature must decrease
below the Operating Setpoint before the boiler
can restart. The differential is adjustable between
10° and 30°F.
3. Circulator Overrun Time (OR_)
Circulator Overrun Time (also called “circulator
off delay” or “circulator post purge”) continues
circulator operation after a call for heat has
ended, sending excess heat from the boiler into
the priority zone. Ensure system piping and zone
panel settings allow water flow to the priority
zone after the call for heat ends. The Circulator
Overrun Time has a factor setting of 0 minutes
and is field adjustable between 0 and 10 minutes.
5. Circulator Pre-Purge Time (PP_)
When the boiler is warm [boiler water
temperature higher than 140°F (adjustable using
Start Temperature parameter)] and there is a
thermostat call for heat, the system circulator
Table 10: Circulator Pre-Purge Time Example,
Parameter PP = 2 Minutes
9 Operating (continued)