Andrews SF61 Leitfaden

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SF60

Water Heater

Technical Documentation

This manual must be kept with the appliance November 2013

Technical data

SF61 SF62 SF63 SF64 SF65 SF66 SF67

Maximum set point ºC 75 75 75 75 75 75 75

Nominal heat output at 75-60ºC max/min* kW 142.2/23.5 190.3/39.5 237.4/39.5 285.5/39.5 380.6/76.6 475.8/76.6 539.6/76.6

Nominal heat output at 40/30ºC max/min* kW 150.7/26.7 201.6/45.2 251.4/45.1 302.3/45.2 403.1/87.7 503.9/87.7 571.5/87.7

Nominal heat input Hi max/min* kW 145.0/24.5 194.0/41.5 242.0/41.5 291.0/41.5 388.0/80.5 485.0/80.5 550.0/80.5

Efficiency at 40/30ºC % 103.9

Annual efficiency (NNG 75/60ºC) % 106.8

Annual efficiency (NNG 40/30ºC) % 110.4

Standstill losses (Twater = 70ºC) % 0.21 0.18 0.17 0.16 0.15 0.14 0.13

Max. condensate flow l/h 11 15 19 22 30 37 42

Gas consumption H-gas max/min (10,9 kWh/m

) m

/h 13.3/2.3 17.8/3.8 22.2/3.8 26.7/3.8 35.6/7.4 44.5/7.4 50.5/7.4

Gas consumption L-gas max/min (8,34 kWh/m

/h 17.4/2.9 23.2/5.0 29.0/5.0 34.9/5.0 46.5/9.7 58.2/9.7 66.0/9.7

Gas consumption LL-gas max/min (8,34 kWh/m

) m

/h 17.4/2.9 23.2/5.8 29.0/5.8 34.9/5.8 46.5/11.2 58.2/11.2 66.0/11.2

Gas consumption LPG max/min (12,8 kWh/kg) kg/h 11.3/1.9 15.2/3.2 18.9/3.2 22.7/3.2 30.3/6.3 37.9/6.3 43.0/6.3

Gas pressure H-gas mbar 20

Gas pressure L/LL-gas mbar 25

Gas pressure LPG mbar 30/50

Maximum gas pressure mbar 100

Fluegas temperature at 80/60ºC max/min ºC 78/61

Fluegas temperature at 40/30ºC max/min ºC 56/30

Fluegas quantity max/min* m

/h 238/40 318/69 397/69 477/69 636/134 795/134 901/134

CO2level natural gas max/min % 10.2/9.4

CO2level LPG max/min % 11.9/10.0

NOx level max/min mg/kWh 35/15

CO level max/min mg/kWh 14/8

Max. permissible flue resistance max/min Pa 160/10 160/10 200/10 200/10 200/10 250/10 250/10

Water volume l 27 31 35 61 68 75 82

Water pressure max/min bar 8/1

Electrical connection V 230/400

Frequency Hz 50

Mains connection fuse A 10

IP class - IP20

Power consumption boiler max/min (excl. pump) W 158/43 200/35 230/35 260/35 470/61 650/61 770/61

Power consumption DHW pump (optional) W 245 340 470 470 720 1150 1550

Power consumption DHW bypass pump W 245 245 245 245 380 460 530

Power consumption swimming pool pump (optional) W 550 900 1500 1100 2200 3000 3000

Weight (empty) kg 295 345 400 465 535 590 650

Noise level at 1 meter distance dB(A) 59

Ionisation current minimum µA 6

PH value condensate - 3.2

CE certification code - CE-0063BS3840

Water connections - R2" DN65 PN16

Gas connection - R3/4" R1" R1.1/2"

Flue gas connection mm 150 200 250

Air intake connection (for room sealed use) mm 130 150 200

Condensate connection mm 22

* min load on gasses H/L/LPG. For type R602-R607 on LL-gas min value is 15% higher.

Dimensions (water heater)

Top view

Rear view Side view Front view

Dimensions SF61 SF62 SF63 SF64 SF65 SF66 SF67

Lmm 1105 1260 1470 1220 1435 1585 1735

L2 mm 127.5 127.5 137.5 137.5 187.5 187.5 187.5

Hmm 1480 1480 1500 1500 1500 1500 1500

H2 mm 1120 1130 1130 1150 1245 1245 1245

Bmm 670 670 670 770 770 770 770

B2 mm 225 235 235 235 260 260 260

B3 mm 260 260 260 310 310 310 310

B4 mm 130 130 130 245 245 245 245

D1 mm 130 150 150 150 200 200 200

D2 mm 150 150 200 200 250 250 250

W1 R” / DN R2” R2” R2” DN65 PN16

W2 R” / DN R2” R2” R2” DN65 PN16

GR R3/4” R1” R1” R1” R1 1/2”

1 Electrical connections

2 Gas supply

3 Water supply

4 Water return

5 Air intake

6 Boiler water drain valve 1/2”

7 Flue gas outlet

8 Condensate drain

flexible hose 25mm diam.

7(D2)

2(G)

3(W1)

4(W2)

5(D1)

B3 B2

413490

1175

73 L2

115

1440

General

This document is meant to be used in addition to the SUPAheat SH60 (R600) heating

boiler documentation, in case of having a SUPAflo SF60 (R600) water heater version.

This documentation only contains the difference in construction and application to the

heating boiler version. General information on the boiler (transport, commissioning,

maintenance, etc.) can be found in the heating boiler documentation.

Technical Description

The SF60 water heater are applicable for direct heating of sanitary hot water without

using an hydraulic separation (i.e. plate heat exchanger) in the system.

This special version of the SF60 boiler series is mainly identical to the heating boiler version,

except for the manifolds on the heat exchanger. These are made from stainless steel instead

of cast iron, assuring the hydraulic side of the boiler being fully made of stainless steel and

allowing the boiler to be flushed with the sanitary hot water directly.

Water quality

Water heater

As a water heater is constantly flushed with fresh water, there are restrictions to the

maximum flow temperature related to the hardness of the water. The following table indicates

the maximum flow temperatures for different water hardness values. Not respecting these

values can lead to damage of the heat exchanger.

Maximum flow temperature related to water hardness

Water hardness Max. setpoint (P1) Temp. limiter setting High limit setting

[ºdH] [ºf] [ºC] [ºC] [ºC]

15 - 20 27 - 36 80 87 90

20 - 28 36 - 50 60 67 70

Hot water production (water heater only)

The following table shows the sanitary hot water tapping volumes which can be achieved

with an SF60 water heater, based on a cold water inlet temperature of 10ºC.

Hot water tapping volumes (cold water = 10ºC)

Output flow @50ºC flow @60ºC flow @65ºC flow @70ºC

[kW] [l/min] [l/min] [l/min] [l/min]

SF61 142 51.1 40.8 37.1 34.0

SF62 190 68.3 54.7 49.7 45.5

SF63 237 85.2 68.2 62.0 56.8

SF64 285 102.5 82.0 74.5 68.3

SF65 380 136.6 109.3 99.4 91.1

SF66 475 170.8 136.6 124.2 113.9

SF67 539 193.8 155.0 141.0 129.2

Hydraulic connection

Water heater

The SF60 water heater must be installed in such a way, that a minimum water flow rate of

30% of the nominal flow rate can be assured at all times when the burner is switched on. The

SF60 water heater can increase the water temperature by maximum 17K at once. This

means that the water has to cycle through the boiler several times when f.e. cold water of

10ºC has to be heated up to 60ºC (3 times).

This is normally done by installing the SF60 water heater in combination with a buffer tank.

The flow rate from the tank to the water heater and back can then be secured by the

(primary) water heater pump.

The table below shows the nominal water flow data a

(optional) pump kit for each type of water heater.

Water flow data water heater

flow rate

Boiler

resistance

Pump type Voltage Curve

setting

Pump

head

Residual

pump head

[K] [m3/h] [kPa] [-] [V] [-] [kPa] [kPa]

SF61 7.2 14 UPS 32-80B 230 3

SF62 9.5 25 UPS 32-120FB 230 3

SF63 12.0 39 UPS 40-120FB 230 3

SF64 14.4 21 UPS 40-120FB 230 3

SF65 19.2 37 UPS 50-120FB 400 3

SF66 24.0 58 UPS 65-120FB 400 3

SF67

27.2 76 UPS 65-180FB 400 3

104

System examples

The following examples are only meant to give an indication of the possibilities available with

the SF60 water heater and swimming pool boilers. These examples can not be used in a

project without any further analysis of the project situation by an authorized company.

System 1:water heater with buffer tank (1)

Water heater connected to a buffer tank, with the cold water feed connected to the return

connection of the buffer tank. This is the most common way to connect a water heater.

Having the cold water feed on the return connection of the tank results in less start/stop

sequences of the water heater and creates a stable temperature control in a normal hot

water installation.

System 2: water heater with buffer tank (2)

Water heater connected to a buffer tank, with the cold water feed connected to the return

connection of the water heater. This system is only applicable when there’s a constant hot

water demand of hot water, peak loads can cause a high number of start and stop

sequences.

System 3:water heater with big buffer tank

When having temporary peak demand, it’s useful to have a big buffer tank (or multiple

smaller tanks in series) in combination with a small water heater capacity. The capacity of

the water heater is determined by the maximum loading time of the buffer tank.

System 4: water heater cascade

When having a constant high demand of hot water, it’s useful to install a high capacity water

heater (or even a cascade of multiple water heaters) in combination with a small buffer tank.

The Buffer tank is only covering the starting delay of the boilers, after that the boilers

completely cover the hot water demand constantly.

System 5:bypass water heater

This system is mainly used in industrial processes with a constant demand of hot water.

The bypass water heater can be used without a buffer tank, as the internal bypass covers the

minimum flow rate through the water heater. The Bypass water heater can heat up the hot

System 6:bypass water heater with buffer tank

This system is mainly used in industrial processes,where there is a requirement for direct

increase of the water temperature with more than 17K, without having a constant demand.

Without the buffer tank the bypass water heater would generate many startsand stops and

have a restive regulation.

SF60

Baxi Commercial

Wood Lane, Erdington,

Birmingham B24 9QP

Email: andrews@ba icommercialdivision.com

www.andrewswaterheaters.co.uk

Publication Date: NOV 2013

Sales:

0845 070 1056

Technical:

0845 070 1057

RS 33961

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