|
| Boiler Target |
0 | 0 | |
1 | 2 | |
2 | 4 | 50°F |
3 | 6 | 71.3°F |
4 | 8 | 92.5°F |
5 | 10 | 113.8°F |
6 | 12 | 135°F |
7 | 14 | 156.3°F |
8 | 16 | 177.5°F |
9 | 18 | 198.8°F |
10 | 20 | 220°F |
*Requires a 500Ω resistor. |
|
|
OUTDOOR AIR SENSOR
RAYPAK MODULATING TEMP CONTROL
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
NOTE: For Modes 7 and 8, connect to pins 13 and 14 on the
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.
*
*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 1⁄2 of this dif- 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
