Raypak XPAK 85 - Manual (Page 49)

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JUMPER IN POSITION 5:
unused
JUMPER IN POSITION 6:
unused
The boiler is supplied standard with the jumper in position 3
(standard heating + indirect water tank with thermostat); if
you wish to use an external water tank with sensor, move this
jumper from position 3 to position 2 (case B, Fig 61); if you
wish to have low temperature for floor space heating move
the not inserted jumper in position 1 (Fig 61).
CASE A CASE B
1 1 1 1
6 6 6 6
Indirect water tank with
thermostat to control
DHW temperature
Indirect water tank with
sensor to control DHW
temperature
radiators
(factory set)
radiators floor heating floor heating
B
A
JP
Fig. 61
Fig. 62 Fig. 63
16. SETTING THE OUTDOOR RESET CURVE WITH
OUTDOOR SENSOR
Outdoor temperature reset only works with the outdoor air sensor
connected, therefore, after installation, connect the outdoor air
sensor to the relative connections on the boiler terminal board
(Fig. 35).
This enables the outdoor temperature reset function.
The user can program the desired supply temperature based on
the heat transmitter that will be used in the installation. Once the
outdoor sensor is connected to the control board, the water
temperature of the boiler will adjust to run the boiler more efficiently
and provide greater comfort to the living space.
NOTICE: The DHW temperature is independent from the
outdoor air sensor.
Selecting the offset heating curve (Fig. 65)
The offset heating curve maintains a theoretical ambient tempe-
rature of 68°F (20°C) at outdoor temperatures ranging from 68°F
to -4°F (+20°C to -20°C). The choice of the curve depends on the
rated minimum outdoor temperature (of the geographical area)
and the rated delivery temperature (on the type of system) and
must be carefully calculated by the installer using the following
formula using the correct values in °F or °C:
Tshift =86°F (30°C) standard systems (radiators)
77°F (25°C) underfloor systems
If the calculation generates an intermediate value between two
curves, choose the nearest offset heating curve to that value.
E.g.: if the value obtained by the calculation is 1.3, it lies between
curve 1 and curve 1.5. In this case, select the nearest curve, i.e.: 1.5.
TMR =
Nominal flow Temp. - Tshift
68°F (20°C) - min. external design Temp.
Select KT by turning the trimmer located under the domestic hot
water temperature knob (A).
The settable values of KT are:
- standard system: 1,0-1,5-2,0-2,5-3,0
- floor system: 0,2-0,4-0,6-0,8
TYPE OF HEAT REQUEST
STANDARD
If a room thermostat is connected to the boiler: room
thermostat
The room thermostat makes a heat request when its contact
closes, while it stops it when its contact opens. Though delivery
temperature is automatically calculated by the boiler, the user
may manually override it. By modifying HEATING on the user
interface (C), the HEATING SET POINT will no longer be available
but just a value that can be set from +5 to -5 as required. Please
note that the number displayed is a comfort level: +5 means feel
hotter, -5 means feel colder. Modifications to this value do not
directly change flow temperature but affect the calculation made
to automatically determine its value by modifying the reference
temperature of the system (0 = 68°F (20°C)).
PROGRAMMABLE TIMER (DAY+NIGHT)
If a programmable timer (day+night selector) is connected to
the boiler, set parameter 51 = 1 (this parameter can only be
modified from the remote control unit) (Fig. 67) available only
from Raypak technical service.
When the contact is closed, the heat request is made by the delivery
probe on the basis of the external temperature in order to maintain
the rated ambient temperature at the DAY level 68°F (20 °C). When
the contact opens, it does not stop the heat request but reduces
(parallel shift) the temperature curve to the NIGHT level 61°F (16
°C).
This activates the night mode.
Though flow temperature is automatically calculated by the boiler,
the user may manually override it.
By modifying HEATING on the user interface (C, Fig. 13.2), the
HEATING SET POINT will no longer be available but just a value
that can be set from +5 to -5 as required. Please note that the
number displayed is a comfort level: +5 means feel hotter, -5
means feel colder.
Modifications to this value do not directly change flow tempera-
ture but affect the calculation made to automatically determine
its value by modifying the reference temperature of the system
(0 = 68°F (20°C) for DAY level; 61°F (16°C) for NIGHT level).
If a remote control (Raypak REC 08) is installed refer to
instructions for setting the outdoor sensor using.