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2-10 VDC
4-20 mA*
0
1
2
3
4
5
6
7
8
9
10
*Requires a 500Ω resistor.
Table P: 2-10 VDC or 4-20 mA External Input Signal
Mode 8 – This mode is for remote firing control of the
heater via an external sequencer such as the Raypak
TempTracker MOD+.
The Boil Max setting is the
heater shutdown temperature (max temperature). The
heater is enabled via dry contact at the Enable/Disable
connection at the low voltage terminal strip, and the fir-
ing rate is controlled by a 0-10 VDC signal from the
external sequencer. A control signal of ≥0.5 VDC
equates to minimum fire, and a signal of 10 VDC
equates to 100% firing rate.
NOTE: For Modes 7 and 8, connect to pins 13 and
14 on the low-voltage panel. See page 21. Use
these modes for systems using an external signal.
Definitions
NOTE: The defined terms are not active in all
modes of control operation.
% 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.
All manuals and user guides at all-guides.com
Boiler Target
0
--- (OFF)
2
--- (OFF)
4
50°F
6
71.3°F
8
92.5°F
10
113.8°F
12
135°F
14
156.3°F
16
177.5°F
18
198.8°F
20
220°F
OUTDOOR AIR
SENSOR
*Maximum 4 times the pipe diameter or 12", whichever is less.
Fig. 36: Mode 8 Primary/Secondary Piping with
External Direct Drive
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 - Holds control output at ignition
setting from the start of the ignition sequence to the
specified burner delay time (0 to 3:00 min.).
DEM 1 - Indicates 24 VDC signal has been supplied to
the H+D terminal.
DEM 2 - Indicates 24 VDC Flame Proof signal is pres-
ent.
DIFF - The operating differential of the heater; The
heater outlet water temperature is allowed to rise
above the BOIL TARGET temperature by
ferential before the heater shuts off. For example, if
the heater target temperature is set to 160°F (71°C)
and the differential is set to 10°F (5°C), on temperature
rise, the heater will shut off at 165°F (74°C). Once the
heater shuts off, it will not come on again until the tem-
perature falls to 155°F (68°C).
33
RAYPAK
MODULATING
TEMP CONTROL
*
⁄
of this dif-
1
2
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