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Raypak MVB 5042004 User Manual

Page 35

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35

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 call for heat. 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 call for heat. A 4-20 mA

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

Water Heater (WH1)

Item

Modes

Default Setting

Range

Boil Target

2

140°F

OFF, 70 to 190°F

3, 7

160°F

OFF, 70 to 190°F

Boil Max

2, 3, 6, 7

180°F

OFF, 120 to 190°F

Boil Min

2, 3, 7

135°F

OFF, 80 to 180°F

‘Burner’ Delay

All

0:00 min

0:00 to 3:00 min

Boil Mass

All

1 (Low)

1 (Low), 2 (Med), 3 (High)

Diff

2, 3, 7

Auto

Auto, 2 to 42°F

DHW Target

3

120°F

OFF, 70 to 190°F

DHW Diff

3

5°F

2 to 10°F

‘Pump’ Dly

All

3:00 min

OFF, 0:20 to 9:55 min, ON

Units

All

°F

°F or °C

Mode

N/A

3

2, 3, 7

External Input Signal

7

2 to 10 VDC

2 to 10 VDC or 0 to 10 VDC

Offset

7

0°F

-10°F to 10°F

Table S: Modulating Temperature Control Default Setpoints—Water Heater

installing a 500 Ω resistor on the external input signal

device’s terminals.

FP - Flame proof warning.

MODE - Operating mode of the heater.

OFFSET - The Offset setting allows the boiler target

temperature to be fine tuned to the external input sig-

nal. The control reads the external input signal and

converts this to a boiler target temperature. The Offset

setting is then added to the boiler target temperature.

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).