Raypak 5042004 operating instructions 0-10VDC, 0-20mA, Boiler Target

ELECTRONIC

trol operates the boiler burner to maintain the boiler target at the boiler outlet sensor.

Mode 7 – Designed for an external input signal with primary/secondary piping. The external input signal can be provided from a BMS, an EMS or an external control. The external input signal changes the boiler target according to a linear scale (see Tables O & P). The control operates the boiler burner to maintain the boiler target at the system sensor. See Fig. 35.

Fig. 33: Mode 3 Dedicated DHW

Mode 4 (Not supported) – Outdoor reset using pri- mary piping. The heater is operated as in Mode 1. However, the target temperature is based on outdoor reset.

Mode 5 – Outdoor reset using primary/secondary pip- ing. The heater is operated as in Mode 2. However, the target temperature is based on outdoor reset. See Fig. 34.

*Maximum 4 times the pipe diameter* or 12”, whichever is less.

Fig. 34: Mode 5 Primary/Secondary Piping with

Outdoor Reset

Mode 6 (Not supported) – Designed for an external input signal with primary piping. The external input sig- nal can be provided from a BMS, an EMS or a sequencing control. The external input signal changes the boiler target according to a linear scale. The con-

			*
*Maximum 4 times the pipe diameter or 12”, whichever is less.
Fig. 35: Mode 7 Primary/Secondary Piping with
	External Target Temp
0-10 VDC		0-20 mA*		Boiler Target
0	0			--- (OFF)
1	2				50°F
2	4			68.9°F
3	6			87.8°F
4	8			106.7°F
5	10			125.6°F
6	12			144.1°F
7	14			163.3°F
8	16			182.2°F
9	18			201.1°F
10	20			220°F

*Requires a 500Ω resistor.

Table O: 0-10 VDC or 0-20 mA External Input Signal

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