Raypak MVB TYPE B 504-2004 Instrucciones de operaciones descargar pdf (Pagina 33)

Mode 8 – This mode is used for remote control of the

heater. The Boil Max setting is the heater shutdown

temperature. The heater is enabled with a control sig-

nal ≥ 0.5 VDC. 0.5 VDC corresponds to minimum fire

an 10 VDC corresponds to 100% firing rate. The BOIL

MAX setting is the heater shutdown temperature.

Definitions

% 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.

2-10 VDC 4-20 mA* Boiler Target

0 0 --- (OFF)

1 2 --- (OFF)

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

Table P: 2-10 VDC or 4-20 mA External Input Signal

*Requires a 500Ω resistor.

NOTE: The defined terms are not active in all

modes of control operation.

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

⁄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).

EXTERNAL INPUT SIGNAL – Selects external input

signal range (0-10VDC or 2-10VDC):

0-10VDC or 0-20 mA external input signal – When

the 0-10VDC signal is selected, an input voltage of 1

VDC corresponds to a boiler target temperature of

50°F (10°C). An input voltage of 10 VDC corresponds

to a boiler target temperature of 220°F (104°C). As the

voltage varies between 1 VDC and 10 VDC, the boiler

target temperature varies linearly between 50°F

(10°C) and 220°F (104°C) (refer to Table O). If a volt-

age below 0.5 VDC is received, the boiler target

temperature is displayed as “– – –” indicating that

there is no longer an internal heat demand. A 0-20 mA

signal can be converted to a 0-10 VDC signal by

installing a 500 Ω resistor on the external input signal

device’s terminals.

2-10VDC or 4-20 mA external input signal – When

the 2-10VDC signal is selected, an input voltage of 2

VDC corresponds to a boiler target temperature of

50°F (10°C). An input voltage of 10 VDC corresponds

to a boiler target temperature of 220°F (104°C). As the

voltage varies between 2 VDC and 10 VDC, the boiler

target temperature varies linearly between 50°F

(10°C) and 220°F (104°C) (refer to Table P). If a volt-

age below 1.5 VDC is received, the boiler target

temperature is displayed as “– – –” indicating that

there is no longer an internal heat demand. A 4-20 mA

signal can be converted to a 2-10 VDC signal by

installing a 500 Ω resistor on the external input signal

device’s terminals.

California Hot Water Supply, Inc.

(800) 249-7244

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Raypak MVB TYPE B 504-2004 Instrucciones de operaciones Pagina 33

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