Crestron electronic Crest Condensing Boiler 3.5 - Manual (Page 35)

35
Installation & Operation Manual
7
Field wiring
ELECTRICAL SHOCK HAZARD – For
your safety, turn off electrical power supply
before making any electrical connections
to avoid possible electric shock hazard.
Failure to do so can cause severe personal
injury or death.
Wiring must be N.E.C. Class 1.
If original wiring as supplied with boiler
must be replaced, use only type 105°C
wire or equivalent.
Boiler must be electrically grounded as
required by National Electrical Code
ANSI/NFPA 70 – latest edition.
Installation must comply with:
1. National Electrical Code and any other national, state,
provincial, or local codes, or regulations.
2. In Canada, CSA C22.1 Canadian Electrical Code Part 1, and
any local codes.
Line voltage connections
1. Connect 120 VAC power wiring to the line voltage terminal
strip in the junction box, as shown in FIG. 7-1.
2. Provide and install a fused disconnect or service switch
sized per the boiler amp draw (shown on the boiler rating
plate) as required by the code (see FIG. 7-1).
3. When connecting the boiler, system and hot water generator
pumps connect the wiring to the line voltage terminal strip
as shown in FIG. 7-1. Maximum current is 1.5 amps.
Install a field supplied contactor between the pump(s) and
the boiler connections.
4. For alternate voltages, consult factory.
Figure 7-1 Boiler Line Voltage Field Wiring Connections
Label all wires prior to disconnection when
servicing controls. Wiring errors can
cause improper and dangerous operation.
ƽ WARNING
NOTICE
ƽ CAUTION
12
0V
SU
PPLY
SY
STEM
PU
M
P
BOI
L
ER
PU
M
P
HWG P
U
MP
M
AX.
1
.5 AMPS P
ER
CO
NNECT
IO
N
NL
F
IEL
D
SU
PPL
IED
C
O
N
TA
C
TOR
MUS
T
BE I
N
ST
A
L
LE
D
GROUND G
NEUTRAL W
LINE BK
SYSTEM PUMP
DRY CONTACT
BOILER PUMP
DRY CONTACT
HWG PUMP
DRY CONTACT
SERVICE SWITCH
CONTACTOR
(FIELD SUPPLIED)