Enviro HL SERIES User Manual

ENVIRO-TEC
46
FORM ET115.24-NOM11 (118)
Electric Heat
will not operate
(cont’d)
CAUTION:
UNIT MAY BE
EXTREMELY
HOT. TAKE
GREAT
CARE WHEN
TROUBLE-
SHOOTING.
[Solid state relay] electric heat safety
contactor fault
Verify control voltage is at magnetic electric heat contactor control
coil terminals. If power is present at coil but contactor is not
actuated, replace contactor.
[Solid state relay] Solid State Relay
fault
Verify heating demand (control voltage) is at solid state relay
control terminals. If power is present but relay is not actuated,
replace relay.
[Solid state relay proportional
control] Heat controller fault
Verify DC control signal is present at controller input terminals.
Verify that output control voltage to solid state relay varies with
variation in input. Replace controller if not.
Electric Heat
shuts down
unexpectedly
CAUTION:
UNIT MAY BE
EXTREMELY
HOT. TAKE
GREAT
CARE WHEN
TROUBLE-
SHOOTING.
Loss of demand.
Verify that thermostat or control command signal is not dropping
out. Verify voltage is present at unit during demand for heat.
[24V units] Loss of demand.
Verify that signal from thermostat or control is not dropping out.
During demand, there needs to be 24V on 'W1' terminal of Fan
Relay board.
Primary limit switch tripped.
Verify no loss of demand to unit. Verify that voltage exists on
heater contactor during demand for heat. If demand reaches unit
but not contactor, primary limit is tripped. The primary limit
switch(es) will auto-reset once the unit cools down. If unit is hot,
wait for heater to cool down. This may take up to an hour. If limit
trips again, verify heater is not overheating.
Secondary limit switch tripped.
The secondary limit may be manually reset. If unit is hot, wat
for the heater to cool down. This may take up to an hour. Reset
switch(es). If limits trip again, verify heater is not overheating.
Loss of fan speed command. Heater will not operate if fan is not enabled.
Intermittent control device
Verify operation of any control device such as drain pan oat
switch, freeze stat, thermostat, etc. When in doubt, jumper out
and verify fan operation.
Loose wiring Verify and/or tighten all wiring connections.
Electric heater is
overheating
CAUTION:
UNIT MAY BE
EXTREMELY
HOT. TAKE
GREAT
CARE WHEN
TROUBLE-
SHOOTING.
Insucient airow
Verify that airow is sucient to provide a minimum of 70 CFM
per kW of electric heat.
Improper duct connections
Electric heaters require even airow across the face of the heater
in order to operate properly. Verify ductwork is installed per
SMACNA and ASHRAE guidelines.
Obstructed ductwork
Verify no obstructions. Verify all dampers are full open while
fan operates.
Intermittent fan Verify fan motor runs continuously, providing even airow.
Incorrect voltage applied. Verify proper voltage to unit per unit label.
Improper wiring connections
Verify wiring to schematic. If Fan Coil Relay board present, verify
all jumpers and harnesses installed. Refer to Fan Coil Relay Board
Troubleshooting Guide.
Damaged heater elements
Remove power from unit. Access the heater compartment. Verify
heating elements are undamaged.
Shorted magnetic heater contactor
Remove thermostat or control command signal. Verify no control
voltage to heater contactor. If electric heat continues to operate
and all wiring has been veried, replace contactor.
[Solid state relay] Shorted solid
state relay
Remove thermostat or control command signal. Verify no control
voltage to solid state relay. If electric heat continues to operate
and all wiring has been veried, replace solid state relay.

Enviro HL SERIES Specifications

General

Brand	Enviro
Model	HL SERIES
Category	Fan
Language	English