Completing Heater Installation - Carrier WeatherMaster 50HC04 Service And Maintenance Instructions

Bare Heater Model Number
Heater Sales Package PNO
Includes:
Bare Heater
Carton and Packing Materials
Installation Sheet
Fig. 41 — Typical Module Installation
SINGLE POINT BOXES AND SUPPLEMENTARY FUSES
When the unit MOCP device value exceeds 60A, unit-mounted
supplementary fuses are required for each heater circuit. These
fuses are included in accessory single point boxes, with power
distribution and fuse blocks. The single point box will be in-
stalled directly under the unit control box, just to the left of the
partition separating the indoor section (with electric heaters)
from the outdoor section. The single point box has a hinged ac-
cess cover. See Fig. 42.
SINGLE
POINT
BOX
FIELD POWER
CONNECTIONS
HINGED
COVER
Fig. 42 — Typical Single Point Installation
On 50HC units, all fuses are 60A. Single point boxes contain-
ing fuses for 208/230-v applications use UL Class RK5 250-v
fuses (Bussmann FRNR 60 or Shawmut TR 60R). Single point
boxes for 460-v and 575-v applications use UL Class T 600-v
fuses (Bussmann JJS 60 or Shawmut A6T 60). (Note that all
heaters are qualified for use with a 60A fuse, regardless of ac-
tual heater ampacity, so only 60A fuses are necessary.)
On 07-09 size units, unit heater applications not requiring sup-
plemental fuses require a special single point box without any
Table 6 — Heater Model Number
C R H E
C R H E
TRACK
FLANGE
A L LI ED PA
C O R P .
MO D E L N O. O D
E RI A L N O.
22 .2
NDITIONING ISTED AIR 1
UIP ACCESS 2 3
346N. 3
P / N 2 - - 5610 - - 4 REV
A T E R
A T E R
fuses. Connect power supply conductors to heater conductors
and field-supplied base unit power tap leads (see Completing
Heater Installation section) inside the empty single point box
using UL-approved connectors.
SAFETY DEVICES
Electric heater applications other than CRHEATER113B00-
116B00, 128B00, and 129B00 use a combination of 24-v con-
trol side break/auto-reset or line-break/auto-reset limit switch-
es and a pilot-circuit/manual reset limit switch to protect the
unit against over-temperature situations.
CRHEATER113B00-116B00, 128B00, and 129B00 electric
heater applications use a combination of 24-v control side
break/auto-reset, line-break/non-resettable "one shot" limit
switches and a pilot-circuit/manual reset limit switch to protect
the unit against over-temperature situations.
Line-break/auto-reset limit switches, 24-v control side break/
auto-reset and line-break/non-resettable "one shot" limit
switches are mounted on the base plate of each heater module.
See Fig. 43. These are accessed through the indoor access pan-
el. Remove the switch by removing two screws into the base
plate and extracting the existing switch.
Pilot-circuit/manual reset limit switch is located in the side
plate of the indoor (supply) fan housing. See Fig. 43.

Completing Heater Installation

FIELD POWER CONNECTIONS
Tap conductors must be installed between the base unit's field
power connection lugs and the single point box (with or with-
out fuses). See Fig. 38. Refer to unit wiring schematic. Use
copper wire only. For connection using the single point box
without 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.
A L LI E DPA
C O R P .
M O D E LN O.
O D
E R IA L N O.
2 2.2
ISTED AIR
NDITIONING 1
UIP ACCESS 2 3
346N. 3
P/ N 2- - 5610 4 - - REV
Fig. 43 — Typical Location of Heater Limit Switches
(3-phase heater shown)
22
0 0 1 A
A
1 0 1 or
B
PILOT--- CIRCUIT/MANUAL
RESET LIMIT SWITCH
LINE--- BREAK
LIMIT SWITCHES
0 0