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START- - UP
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Before proceeding, verify that all wiring is correct per
factory approved schematic. Notify factory immediately of
any discrepancies.
NOTE: Heater Relay, Rectifier, Time Delay Boards
208/230 1 PH and 3 PH heaters only (does not include 460v).
Each heater element is controlled by a 24VDC control relay. Each
control relay is energized by a small rectifier board attached
directly to relay coil terminals. When possible one rectifier board is
used to control a second relay.
The rectifier board converts incoming 24v AC control signal to
DC. Some heaters may have up to four relays. The second and/or
third relay rectifier board may also have a time delay feature and a
small jumper wire built into it. With the jumper uncut, the time
delay is approximately 5 sec after the initial first stage. When
jumper is cut at factory this provides an 8 sec delay.
NOTE: Refer to base unit installation instructions as required.
1. Check for loose terminal connections.
2. Check that all fuse and circuit breaker short circuit
interrupting ratings are adequate.
Heater
Fuse Block
Field Wire
Connection
Heater Door
(Fused Models Only)
Shown Open
Compressor
Contactor Wire In
Yellow & Black
Strain Relief for
Field Power Wires
3. Turn on unit and heater power.
4. Set thermostat to call for heat.
5. Check operation of heater.
6. Check that airflow across the heater is at or above the
minimum recommended CFM requirement (See unit
installation instructions). Adjust indoor blower heat speed
as required. Check that duct system conforms to static
pressure limits in Table 1.
NOTE: See Table 1 for Non- -Export units (with - -3, - -5 or - -6 as
electrical option- -see product data).
1. Fuses - - Malfunction will interrupt power to the unit. Check
for cause of failure, replace fuses.
2. Limit Switch - - Malfunction prevents heating element(s)
from being energized. Replace switch if malfunction occurs.
3. Contactor - - Malfunction will not allow heater to energize.
Replace faulty contactor. Do not attempt to replace coil or
dress contacts.
Table 1 – Maximum Duct Static Pressure for 60 Hz Units
UNIT
(60 HZ UNITS)
Heat Pump
Electric
Cooling
Fig. 10 - - Fused Heater Control Box
7
TROUBLESHOOTING
(IN. W.C.) (pa)
MAXIMUM STATIC PRESSURE
UNIT SIZE
024
030
036
042
048
.30
.30
.30
.50
.50
(75)
(75)
(75)
(125)
(125)
.30
.30
.30
.50
.50
(75)
(75)
(75)
(125)
(125)
Attach Heater
with 5 Screws
Door Latch
Low Voltage Wiring
Ground Lug
Location
060
.50
(125)
.50
(125)
A06276
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