Submittal Sheet

Job __________________________
Designer ______________________
Contact _______________________
Boiler Control 284
284 _ C
08/14
Multi-Staging Replaces: 02/13
Submittal
© 2014 284_C - 08/14
1 of 2
A Watts Water Technologies Company
Features
--------------------------
--------------------------
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
®
IP or Modbus
®
communication
Primary pump sequencing
Boiler isolation valves
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
®
IP 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, BTL Listed
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 Pump / Valve &
IDHW Pump relays
230 V (ac) 5 A, 1/3 hp
Boiler Stage, Auxiliary
& Alert relays
230 V (ac) 5 A, 1/6 hp
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
H7019C
75 76
Valv e
77 78 79 80 81 82
Pump
Power In
L N
DHW
Alert
45 46
Auxiliary
43 44
Pump
47 48
P1
Pump
Primary Primary
49 50
P2
Pump /
Boiler 1
85 8683 84
20V
11
dc
5V
dc
Out In Out 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
DHW
7
8
Call
Setpoint
910
Call
40 41
BACnet IP
42
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
Disconnect All Power
Before Opening
Designed and
assembled in Canada
Meets Class B: Canadian
ICES & FCC Part 15
Signal wiring must be
rated at least 300 V.
Boiler Control 284
Four tN4, BAS, Four Boiler, DHW & Setpoint
Manual
Override
Home
I
I
Input Power:
115 V (ac) ±10%, 60 Hz, 18 VA
Primary Pump Relays:
230 V (ac), 10 A, 1/2 hp
Boiler & DHW Pumps:
230 V (ac), 5 A, 1/3 hp
Boiler Stage, Auxiliary &
Alert Relays:
230 V (ac), 5 A, 1/6 hp
Calls: 24 V (ac) or Short
I
BA
Gnd
+
–––
RS485
Flow
Sensor
Pressure
Sensor
WARNING
Valv e
Pump /
Boiler 2
Valv e
Pump /
Boiler 3
Valv e
Pump /
Boiler 4
Scan code for quick
link to product page on
tekmarControls.com