Chromalox HVH Series, Installation Instructions Manual

9

REMOTE FAN SWITCH

480V + Heaters require an additional fan relay. (Avail-

able as a kit or factory installed option and standard on 

heaters 20kW and above).

The wall switch is packed in the wiring compartment.
1.  Use 18 gauge (min.) NEC Class 1, 600V wiring that 

meets all Local and NEC requirements.

2.  Install the wall switch in a standard wall box in any 

convenient location that is protected from traffic or 

other accidental damage.

3.  Connect the field wire to the switch lead wires with 

suitable connectors.

OPTIONAL THERMOSTAT (HVH-TK) Refer to In-

struction Sheet PF204.
Heaters can be equipped with an optional thermostat 

of the Bulb and Capillary type for automatic tempera-

ture control (Figure 8). The thermostat controls the 

heating elements and fan simultaneously to achieve 

set temperature.
The “Lo” setting of the thermostat is approximately 

40˚F, and the “Hi” setting is approximately 90˚F. 

Figure 9 — Thermostat Location, Front View

CONTROL VOLTAGE WIRING — EXTERNAL RE-

MOTE THERMOSTATS AND FAN SWITCHES

ELECTRIC SHOCK HAZARD. Be sure electricity 

is turned off at main switch first before wiring. 

Any installation involving electric heaters must 

be effectively grounded in accordance with the 

National Electrical Code to eliminate shock 

hazard.

1.  Use 600 volt, NEC Class 1 insulated wiring with a 

minimum gage of 18 for thermostats and minimum 

gauge of 14 for line voltage motor switch (remote 

fan switch without relay).

2.  The thermostat should be located in the area to be 

heated on an inside wall. The thermostat should 

not be exposed to drafts, sunlight, radiation from 

hot objects, or in a direct line with the discharge 

from the unit heater.

3.  Install the thermostat approximately 5 feet above 

the floor line.

4.  Install the remote fan switch in any convenient lo-

cation that is protected from traffic or likely acci-

dental damage.

5.  Internal optional controls are shown on the unit 

heater wiring diagrams by a dash line.

T1

T2

T3

L1

L2

L3

Terminal
Block

Cutout

Elements

1Ø Element wiring

(Omit for 2 element

heaters)

Optional disconnect switch

built-in or field installed

Power

60 Hz

Optional thermostat

built-in or field

installed

Blue

Blue

Motor

Cutout

NOTES:

1. Omit "L3" wiring for 1ø heaters

2. 3ø Motors used on all 480V, 7.5KV or higher

Remove jumper wire when

thermostat is used

Black

Red

Power 60 Hz

Pink

Optional

Disconnect

switch

built-in

or field

installed

T1

T2

T3

L1

L2

L3

Yellow

Blue

Sec

C1

C2

C3

3Ø Wiring

See Note #2

Optional Thermostat

Built-in or Field Installed

Motor

TO T1

TO T2

TO T3

Figure 10

Figure 11