Installation
48
RT-SVX35H-EN
(cooling mode) values calculated using calculation #1
above. The second set of circuit values shown on the
nameplate will be for the electric heating circuit as follows.
Select a fuse rating for the electric heating circuit that’s
equal to the MOP value obtained in the equation above. If
the MOP value does not equal a standard fuse size as listed
in NEC 240 - 6, select the next lower standard fuse rating
(see note below for exception).
Note:
If selected MOP is less than the MCA obtained in
the equation above, then select the lowest
standard maximum fuse size which is equal to or
larger than the MCA, provided the selected fuse
size does not exceed 800 amps.
Select a fuse rating for the electric heating circuit that’s
equal to the RDE value. If the RDE value does not equal a
standard fuse size as listed in NEC 240 - 6, select the next
higher standard fuse rating.
Note:
If the selected RDE is greater than the selected MOP
value, then select the RDE value to equal the MOP
value.
Disconnect Switch Sizing (DSS)
Calculation #1 - WX, WF, WL, or WS Single
Power Source Units
Calculation #2 - All WEHE Single Power
Source Units
Use the larger value of the two calculations to size the
electrical service.
Calculation #3 - WEHE (200/230 Volt) casing 2
through 6 (20 - 75 Ton Dual Power Source
Units)
DSS
= 1.15 X LOAD 3 for the Electric heater
AND
Calculation #1 for the Refrigeration Components.
The Rooftop Module (RTM) must have a mode input in
order to operate the rooftop unit. The flexibility of having
several system modes depends upon the type of sensor
and/or remote panel selected to interface with the RTM. An
overall layout of the various control options available for
a Constant Volume application, with the required number
of conductors for each device, is illustrated in
illustrates the various control options with
the required number of conductors for a Variable Air
Volume application.
Note:
All field wiring must conform to NEC guidelines as
well as state and local codes.
The various field installed control panels, sensors,
switches, and contacts discussed in this section require
both AC and DC consideration. These diagrams are
representative of standard applications and are provided
for general reference only. Always refer to the wiring
diagram that shipped with the unit for specific electrical
schematic and connection information.
Controls using 24 VAC
Before installing any connecting wiring, refer to
for the electrical access locations
guidelines, and;
a. Use copper conductors unless otherwise specified.
b. Ensure that the AC control wiring between the
controls and the unit's termination point does not
exceed three (3) ohms/conductor for the length of
the run.
Note:
Resistance in excess of 3 ohms per conductor may
cause component failure due to insufficient AC
voltage supply.
c. Be sure to check all loads and conductors for
grounds, shorts, and improper wiring.
MCA
= (1.25 x LOAD 3)
MOP
= (1.25 x LOAD 3)
RDE
= LOAD 3
DSS
= 1.15 X (LOAD 1 + LOAD 2 + LOAD 4)
DSS
= 1.15 X (LOAD 3 + Supply Fan FLA +
Exhaust Fan FLA.)
PLUS
DSS
= 1.15 X (LOAD 1 + LOAD 2 + LOAD 4)
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote
disconnects before servicing. Follow proper lockout/
tagout procedures to ensure the power can not be
inadvertently energized. Failure to disconnect power
before servicing could result in death or serious injury.
Summary of Contents for IntelliPak WEHE Series
Page 15: ...General Information RT SVX35H EN 15 Figure 1 Unit component layout and ship with locations...
Page 17: ...Installation RT SVX35H EN 17 Figure 2 Typical control module location...
Page 44: ...Installation 44 RT SVX35H EN Figure 27 Typical field power wiring for W_HE casings 2 through 6...
Page 56: ...Installation 56 RT SVX35H EN Figure 32 Wiring notes for CV controls...
Page 60: ...Installation 60 RT SVX35H EN Figure 35 Wiring notes VAV...
Page 68: ...System Start up 68 RT SVX35H EN Figure 38 Typical fenwall ignition control system...
Page 69: ...System Start up RT SVX35H EN 69 Figure 39 Typical Fenwall ignition control system...
