Trane GRCA - Detailed Installation Procedures; Electrical and Installation Safety

ELECTRICAL
CONNECTIONS
All
electrical
connections
must
conform
to:
ANSI/NFPA No.
70-1993
(or
latest
edition)
National
Electrical Code
and
applicable
local
codes.
In
Canada,
to the
Canadian
Electrical
Code,
Part I CSA
Standard
C22.1.
The
rooftop
packaged
unit is
wired
at the
factory
and
ready
to be
connected.
Actual
unit wiring
will
differ
according to
the options
chosen.
Each
furnace
is
shipped
with
its own
wiring
diagram;
refer
to
this
wiring
diagram for
all
electrical
connections
to
the
unit.
All
electrical
connections,
line
voltage
and
thermo-
stat, are made
in the
Electrical
Cabinet
(See
Figure
6).
Line
voltage
connections
are made
at
the High
Voltage
Terminal
Block.
Thermostat
connections
are
made at
the
Main
Connection
Board
(See
figure
7).
CAUTION :
Do
not use any
tools
(i . e .
screwdriver ,
pliers
,
etc . )
across
terminals
to
check for
power .
Use
of a
voltmeter is
recommended .
Outdoor
line
voltage
conduits
leading
into the
unit
should be
installed to
prevent
rain
from
wetting
any
high
voltage
wire. Locate
the
thermostat
in
accor-
dance the
instructions
supplied
with
the
thermostat.
All field
wiring
must
have a
minimum
temperature
rating of 85°
C (185°
F).
Thermostat
wiring
shall be a
minimum of
18 gauge
wire
size. See
the
following
charts for
line
voltage
wire sizes.
Figure
6 . -
Standard
Blower
Cabinet
, Single
Duct
Furnace
with
Supply
Plenum &
Various
Options
Shown
1 . Mixed
Air
Controll e r
2 .
Return
Firestat
3 .
Econom
i zer
4 .
Filters
5.
Bl
o
w er M
otor
6 .
R e
verse
Air Flow
Sw i tch
7 .
Clog g ed F ilter
S
w itch
8 .
Hi gh V
oltag e B
arrier and
L am p
and C i
rcuit
Breaker
Mount
9 .
Main
Connect
i on
Board with
Fan
Time
Delay and
Function
Relays
10 .
Powe
r V e nt o
r
R
ela y
11 .
Freezestat
12 .
Supply
Fir es t a
t
13
.
Duct T h e
r
m
o s t a t
14.
Primary
Safety
Limit
15.
Power
Ventor
Motor
16.
Gas
Piping
Limit
17. Gas
Valve
18.
High
Limit
Safety
Switch
19.
Transformer
20.
Electrical
Wiring
Inlet
21.
High
Voltage
Terminal
Block
22.
Door
Safety Switch
23. Contactor
24.
Centrifugal
Blower
25.
Damper
Motor
26.
Outside
and
Return
Dampers
27.
Enthalpy
Controlled
Economizer
-9-
Intake
Hood
Dampers/Filters
Electrical
Duc t
Supp l y
Blower
Cabinet
Cabinet
F
urnace
Plenum