2
Table 1 – Accessory Heater Usage
ELECTRIC HEATER PART NUMBER
SIZES USED WITH
kW
INTERNAL CIRCUIT PROTECTION
EHK2-05B
18-36
5
Circuit Breaker
EHK2-08B
18-36
7.5
Circuit Breaker
EHK2-10B
18-36
10
Circuit Breaker
Table 2 – Minimum CFM
Fan Coil Unit Size
EHK2-05B
EHK2-08B
EHK2-10B
18
325
350
375
24
450
475
500
30
575
600
625
36
700
725
750
Heater
assembly
locations
Breaker box
locations
Unit sizes 18 & 24
Unit sizes 30 & 36
A13079
Fig. 1 -- Installation Locations for EHK2 Heaters
Ground
Lug
Field
Power
Wiring
Field
Ground
Wiring
ON
OFF
L1
L2
A00077
Fig. 2 -- 5--kW, 7.5--kW, 10--kW Circuit Breaker
and Disconnect Heaters
Ground Connections
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
According to NEC, ANSI/NFPA 70, and local codes, cabinet
must have an uninterrupted or unbroken ground to minimize
personal injury if an electrical fault should occur. The ground
may consist of electrical wire or metal conduit when installed
in accordance with existing electrical codes. (See
Ground/Conduit Note below.)
!
WARNING
NOTE
:
Use UL--listed conduit and conduit connector for
connecting supply wire(s) to unit to obtain proper grounding. If
conduit connection uses reducing washers, a separate ground wire
must be used. Grounding may also be accomplished by using
grounding lugs provided in control box.
Fan Speeds
Before operating unit, be sure that the proper blower speed has
been selected. Fan speeds are selected manually. (See Table 3)
To change the fan speed:
Factory default fan speed is
medium
; fan--motor red wire
connected to fan relay No. 4.
For
high
speed, connect fan--motor black wire to fan relay No. 4.
For
low
speed, connect fan--motor blue wire to fan relay No. 4 and
fan--motor red wire to fan relay No. 6.
Always connect the unused fan--motor wire to the dummy terminal
block.
NOTE
: Be sure that selected speed taps meet the minimum cfm
for cooling size and heater size.
Table 3 – Color Code for Motor Lead Wires
MOTOR SPEED TAP
WIRE COLOR
Common
Purple
High
Black
Medium
Red
Low
Blue
