27
Completing Heater Installation
FIELD POWER CONNECTIONS
Field-supplied tap conductors must be installed between the
base unit’s field power connection lugs and the single point
box (with or without fuses). Refer to unit wiring schematic.
Use copper wire only. Size these conductors based on the MCA
(Minimum Circuit Ampacity) value marked on the 50KC unit’s
info plate for the base unit, less electric heater load. For con-
nection using the single point box less fuses, connect the field
power supply conductors to the heater power leads and the
field-supplied tap conductors inside the single point box. Use
UL-approved pressure connectors (field-supplied) for these
splice joints.
Fig. 38 — Typical Location of Heater Limit Switches
(3-phase heater shown)
LOW-VOLTAGE CONTROL CONNECTIONS
Pull the low-voltage control leads from the heater module(s) -
VIO and BRN (two of each if two modules are installed; iden-
tify for Module #1) - to the 4-pole terminal board TB4 located
on the heater bulkhead to the left of Heater #1. Connect the
VIO lead from Heater #1 to terminal TB4-1. Connect the VIO
lead from Heater #2 to terminal TB4-2. Connect both BRN
leads to terminal TB4-3. See Fig. 39.
Fig. 39 — Accessory Electric Heater Control
Connections
PREMIERLINK™ CONTROLLER (Factory
Option)
For details on 50KC 04-06 units equipped with the factory-in-
stalled PremierLink controller option, refer to the PREMIER-
LINK Retrofit Rooftop Controller Version 3.x Installation,
Start-Up and Configuration Instructions manual.
RTU-OPEN CONTROL SYSTEM
For details on operating 50TCQ units equipped with the facto-
ry-installed RTU Open controller, refer to the “Factory-In-
stalled RTU Open Multi-Protocol Controller Control, Start-
Up, Operation and Troubleshooting” manual.
ALLIED P A
MODE
L N O.
ERIAL N O.
11
13
21
23
OD
3
1
23
ISTED
AIR
NDITIONING
UI
P
ACCE SS
346N
.
P
/ N
2-
5610-4
REV
Line-Break
Limit Switches
HR1: On Heater 1 in Position #1
HR2: On Heater 2 in Position #2 (if installed)
2
3
12
13
2
TB4
HR2
HR1
Elec Htr
CONTL
BOARD
CTB
Field
Connections
VIO BRN BRNVIO
VIO BRN
VIO BRN
ORN
BRN
VIO
ORN VIO BRN
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