Dimensions, RTC PC Board Dimensions, Box-mounted RTC
Addressing
Mounting
I/O Network Configuration
INSTRUCTIONS
RTC Rooftop Controller
Each RTC connected to an AKC 55 must have a unique
address starting with 01. Each address switch has an
arrow pointer which is also a screwdriver slot for setting the
address.
The RTC board has six pre-drilled bolt holes for use in
mounting. Use half-inch standoffs. Mount in accordance
with codes and good electrical practice.
Up to 95 I/O nodes (OI8, RO8, SI8, AKC 16x Smart Case
Controllers, RTC’s, etc) can be connected to one AKC 55.
A maximum of 5 cable runs (1 shown) can be used to connect
any combination of nodes to the AKC 55.
The total length of all I/O cable runs (including stubs) is limited
to 5000 feet. Use point-to-point (“daisy-chain” connections
between boards.
The last I/O board on each cable run must be terminated.
Terminations are supplied with the AKC 55 controller as shown.
When necessary, individual I/O boards can be placed on
individual stubs up to a maximum of 25 feet long off a main
cable run.
©4/99 Danfoss Inc. BRTC.499.2 [RTCInstall]
POWER SUPPLY
24 VAC
Service LED:
Flashing or Steady On - Replace board.
Off - Board OK.
Humidity Sensor
G connect to GND
H connect to SIG
V connect to 12V
L: Line
N: Neutral
G: Ground
Sensor Inputs: 4
Humidity and temperature
1: Zone Humidity 1
2: Zone Humidity 2
3: Outside Humidity
4: Zone Temperature 1
Not used
Not used
SENSOR INPUTS
Power supply
24V AC +10%/-15%
Input Power Fuse:
2 AMP
Output Ratings:
24 VAC
Fused: 2 AMPS
Connections
Relay Connection:
Wire to power for C
controlled load.
Wire to normally NO
open load
Wire to normally NC
closed load
Temperature Sensors: 4
PT 1000 OHM
8: Return Temperature
7: Supply Temperature
6: Outside Temperature
5: Zone Temperature 2
Temperature Sensor Wiring:
example: Type AKS 11
Terminal 1: SIG (Signal)
Terminal 2: GND (Ground
Note: no polarity requirement
Shield
A
B
Outside Temp
6
GND
Status Led's
for DI (Green)
Service
Relay
#6
91
0
5
4
3
6
7
8
2
91
0
5
4
3
6
7
8
2
ADDRESS
C
24 vac
G N L
Zone Humidity
SHIELD
12V
1
GND
SIG
1
Zone Temperature
12V
2
3
4
12V
SHIELD
GND
SIG
SHIELD
GND
SIG
GND
SIG
Outside
Humidity
21
12V
SHIELD
SIG
5
GND
SIG
2
Damper
NCCCNONC NO
Relay
# 2
Relay
# 1
Status LEDs
for RO (Green)
Fan
NONOC NC NCCNO CNC
Cool 3
Relay
#5
Relay
#3
Relay
#4
Addressing
Cool 1
Cool 2
1: Fan
2: Damper
3: Cool 1
4: Cool 2
RELAY OUTPUTS
24 VAC
L
Network Connection
Twisted Pair stranded 22AWG wire
with shield. Belden cable nos. 9841,
9464, 9461, 8762, 8761 or equivalent.
Note: There is no polarity requirement
on network terminals A and B. The shield
must be connected.
Supply Temp
Return Temp
Setting Module
B
NETWORK
87
SIG
GND
SIG
GND
A
SHIELD
N
Heat 1/ Cool 2
Fan
Cool 1
N
1
L
L
2
N
L
3
DIGITAL INPUTS
24 VAC
3: Heat 1/Cool 2
2: Cool 1
1: Fan
5: Cool 3
6: Heat 1
7: Heat 2
8: Heat 3
CNO NC NO NC C NO NC
Smoke/Filter
Relay
#7
Heat 1 Heat 2
Relay
#8
4
N
Heat 3
4: Smoke/Filter
N Neutral (Common)
L Line: 0 - 24 V AC
EMHS
Humidity &
Temperature
TD2
G
H
TD1
V
12V SIG GND SH SIG
GND GND
SIG
Temperature Sensor
TD1 connect to SIG *
TD2 connect to GND *
* No polarity
Humidity
Temperature
SIG GND
SIG GND
rtcwir3.dwg 2/00
+ 2
- 1
+ 1
- 2
Variable Outputs
(on RTV VO only)
VO#1 : for Variable Frequency Drive
VO#2 : for Modulating Damper Motor
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