GSI Group PNEG-377, Service Manual

Page: 35 / 98

35
Fan and Heater
HEATER INSTALLATION
1. Be sure fan unit is installed and
wired to meet local codes. Be
sure equipment is well grounded
(see page 10).
2. A separate neutral is required
for 120 volt heater circuit in 220
volt 1PH and 3PH fan units. For
460 volt fan units a separate 120
volt power supply or transformer
is required.
3. Run 5-wire black cord from
heater unit to fan unit and se-
cure to fan.
4. Orange and red wires should be
connected in series with coil in
fan. When contacts in heater be-
tween these wires open fan
Wiring
Heater Unit
4. Third heater unit may also be added to system.
If adding third unit, run connections to master
unit #1 and connect them in parallel with sec
ondary heater unit.
2. Run (2) 20 gauge (minimum) wires from sec-
ondary heater unit (slave) to heater unit #1
1. Secondary heater unit runs as a slave of heater
unit #1 and requires no plenum temperature
sensor.
Figure 3: Secondary heater wiring diagram.
Figure 2: Wiring diagram for the fan and heater unit.
SECONDARY HEATER UNIT
shuts down. Recommended wiring is shown in Figure 2.
5. Black and white wires should be connected to a fused 120V
power supply as shown. Green wire should be connected to
ground in fan. Heater should have power, even with fan off.
(master).
3. Connect wires as shown in Figure 3.