Submittal

Job __________________________
Designer ______________________
Contact _______________________
Boiler Control 284
284 _ C
02/13
Multi-Staging Replaces: new
Submittal
© 2013 284_C - 02/13
1 of 2
A Watts Water Technologies Company
Features
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Outdoor temperature reset
Programmable schedules
tekmarNet
®
4 compatible
Control up to four boilers
Condensing & non-condensing boiler
groups
Modulating, single stage or two stage
BACnet
®
or Modbus
®
communication
Primary pump sequencing
DHW priority
Setpoint operation
Combustion air damper control
Energy, flow & pressure monitoring
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Specifications
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The Boiler Control 284 is designed to operate up to four boilers to accurately maintain a target water temperature. The 284 operates both
condensing & non-condensing boilers that are either modulating, single stage or two stage to provide a flexible, cost effective mixed boiler
plant solution with better system performance. The target water temperature is based on outdoor temperature reset or a fixed setpoint for
space or process heating applications. Additional loads supplied by the 284 include domestic hot water & setpoint heating. Boiler equal
run-time rotation, stand-by primary pump operation & pump exercising all increase boiler plant reliability. The 284 communicates with a
Building Automation System (BAS) using BACnet
®
or Modbus
®
for remote monitoring & adjustment capability. tekmarNet
®
Thermostats
or a tN4 Gateway 483 can be added to optimize system performance & provide remote monitoring capability.
SPECIAL REQUIREMENTS
N / A
Boiler Control 284 Four tN4, BAS, Four Boiler, DHW & Setpoint
Literature 284_A, 284_B, 284_C, 284_D
Control Microprocessor control. This is not a safety (limit) control
Packaged weight 5.5 lb. (2490 g)
Dimensions 8-1/16” H x 11-1/8” W x 2-15/16” D (204 x 282 x 74 mm)
Enclosure
Blue PC+ABS plastic with metal top and bottom conduit
connection walls, NEMA type 1
Approvals
CSA C US, meets class B: ICES & FCC Part 15
Ambient conditions
Indoor use only, 32 to 122°F (0 to 50°C), < 90% RH non-
condensing
Power supply 115 V (ac) ±10%, 60 Hz, 18 VA
Primary pump relays 230 V (ac) 10 A, 1/2 hp
Boiler & IDHW pump
relays
230 V (ac) 5 A, 1/3 hp
Auxiliary & Alert Relays 230 V (ac) 5 A, 1/6 hp
Boiler Stage Relays 24 V (ac) 5 A
Modulating outputs
4 x 0-10 V (dc) 500  minimum load impedance / 4-20 mA
1 k max load impedance
Calls 24 V (ac) or Short
Sensors NTC thermistor, 10 kΩ @ 77°F (25°C ±0.2°C) ß=3892
–Included Outdoor Sensor 070 and 2 of Universal Sensor 082
–Optional tekmar type: 071, 078, 082
Warranty Limited 3 Year (See 284_D for full warranty)
Front View
8–1/16”
(204 mm)
2–15/16”
(74 mm)
Side View
8–1/16”
(204 mm)
11–1/8”
(282 mm)
7/16” (11 mm)
CL
7/16”
(11 mm)
Ø 3/16”
(5 mm)
1/2” Knock-out
(x 16 back) (x 8 top)
(x 8 bottom) (x 2 side)
1 2345
Temperature Sensors - Do Not Apply Power
tekmarNet Communication
C3C2C0 C1
H7019A
Boiler 1
75 76
Pump
Boiler 2
77 78
Pump
Boiler 3
79 80
Pump
Boiler 4
81 82
Pump Pump
Power In
L N
IDHW
Alert
45 46
Auxiliary
43 44
Pump
47 48
P1
Pump
Primary Primary
49 50
P2
85 8683 84
20V
11
dc
5V
dc
Out In Out
Flow Sensor
Pressure
Sensor
In In
Vdc
14
(+) (+)
Gnd
15
(-) (-)
mA
12 13
(+)
EMS
16
Out
17
Boil
Sup
18
Com
19
Boil
Ret
Boil
In
20
DHW
21
Com
22
Vent
23 24
25
Boil
1
Out
26
Boil 2
Out
27
ComCom
28
Com
31
Boil 3
Out
29
Boil 4
Out
30
tN4
32 33
Bus b
tN4
34 35
Bus 1
tN4
36 37
Bus 2
tN4
38 39
Bus 3
Boiler Boiler Boiler Boiler
Flow Proof
1 2
Call
C.A. Proof
34
Call
Heat
56
Call
IDHW
7 8
Call
Setpoint
910
Call
AB
40 41
BACnet Modbus
42
Gnd
External Flow Proof / Off
External C.A. Proof / Off
Off / Exercise
Setback / Off
51 52
Mod
Boiler 1
53 54
Stage 1 Stage 2
55 56
+
-
Mod Stage 1 Stage 2
+
-
Mod Stage 1 Stage 2
+
-
Mod Stage 1 Stage 2
+
-
57 58
Boiler 2
59 60
61 62 63 64
Boiler 3
65 66
67 68 69 70
Boiler 4
71 72
73 74
tektra 1056-01
For product literature:
www.tekmarControls.com
Caution! Disconnect All
Power before Opening
Designed and
assembled in Canada
Meets Class B: Canadian
ICES & FCC Part 15
Input Power:
115 V (ac) ±10% 60 Hz, 18 VA
Primary Pump Relays:
230 V (ac) 10 A, 1/2 hp
Boiler & IDHW Pumps:
230 V (ac) 5 A, 1/3 hp
Auxiliary & Alert Relays:
230 V (ac) 5 A, 1/6 hp
Boiler Stage Relays:
24 V (ac) 5 A
Calls: 24 V (ac) or Short
Signal wiring must be
rated at least 300 V.
Boiler Control 284
Four tN4, BAS, Four Boiler, DHW & Setpoint
Manual
Override
Home
Scan code for quick
link to product page on
tekmarControls.com