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SECTION C: Installation
29
The Raypak modulating temperature control is pro-
vided to maintain the desired system water temperature.
The control has various modes of operation which are
listed below.
Operating Modes
Mode 1 – Setpoint operation using parallel piping. The
heater outlet water temperature is controlled to the
boiler target setpoint.
Mode 2 – Setpoint operation using primary / secondary
piping. The control modulates the heater to satisfy a
remote header sensor. The heater is turned off based on
boiler max and boiler differential (factory default H7
boilers).
Mode 3 – Dedicated DHW operation using parallel
piping. A call for heat is determined by the DHW sen-
sor. The heater outlet water is controlled to the boiler
target temperature (factory default WH7 water heaters).
Mode 4 – Outdoor reset and reset override operation
using parallel piping. The heater is operated as in Mode
1. However the target temperature is based on outdoor
reset. The outdoor reset temperature can be remotely
overridden.
Mode 5 – Outdoor reset and reset override operation
using primary/secondary piping. The heater is operated
as in Mode 2. However, the target temperature is based
on outdoor reset. The outdoor reset temperature can be
remotely overridden.
Mode 6 – This mode is used for remote control mode.
The Boil Max setting is the heater shutdown tempera-
ture.
Definitions
The following items are common to Modes 1 thru 5.
They are not required for Mode 6 – the mode for exter-
nal heater control.
% OUT - Current percent modulation rate of heater
BOIL DSGN - Design boiler water temperature used
in heat loss calculations
BOIL MASS - This setting allows adjustment in the
field for high or low thermal masses; High thermal
mass (setting=3) provides slower reaction, lower ther-
mal mass (setting=1) provides faster reaction
BOIL MAX - Highest outlet water temperature that
the control is allowed to use as a target temperature
BOIL MIN - Lowest outlet water temperature that the
control is allowed to use as a target temperature
BOIL ON - Accumulated runtime of heater (up to 999
hours, then resets to 0)
BOIL OUT - Actual heater outlet water temperature
BOIL START - Starting boiler water temperature
BOIL SUP - Actual system supply water temperature
BOIL TARGET - Target temperature that the heater is
trying to maintain
‘BURNER’ DELAY - Heater delay from the start of
the ignition sequence until it fires
DIFF - The operating differential of the heater; The
heater outlet water temperature is allowed to rise above
the BOIL TARGET temperature by 1/2 of this differ-
ential before the heater shuts off
MODE - Operating mode of the heater
OUTDR - Outdoor air temperature
OUTDR DESIGN - Design outdoor air temperature
used in the heat loss calculation
OUTDR START - Starting outdoor air temperature
PUMP DLY - Sets the operating time of the pump
once the CFH is satisfied
TANK - Current DHW tank temperature (Mode 3)
TANK DIFF - Storage tank differential (Mode 3)
TANK TARGET - Target temperature in the DHW
storage tank (Mode 3)
UNITS - Selects the temperature units to be displayed
(
o
F or
o
C). For example, if the heater target temperature
is set to 160°F and the differential is set to 10°F, on
temperature rise, the heater will shut off at 165
o
F.
Once the heater shuts off, it will not come on again
until the temperature falls to 155
o
F.
WWSD - Selects the outdoor temperature that shuts
the heater off, no matter what the demand. NOTE: The
WWSD segment is displayed on the LCD.
Operation
The Raypak modulating temperature control uses a
Liquid Crystal Display (LCD) as a method of supply-
ing information. The LCD is used to setup and monitor