Enviro VDD User Manual

ENVIRO-TEC
21
FORM ET115.24-NOM12 (718)
INPUTS AND OUTPUTS
TABLE F.1 – TERMINAL STRIP IDENTIFICATION
Pin Signal Signal Name Description
1
S1 Common
Common side of transformer. Jumped to C (common) through JP1. If
application calls for oat switch JP1 is re-moved and oat switch is connected
between S1 and C.
2
S2
24VAC
Transformer secondary “hot” connection (24VAC). In most cases, these
terminals are internally connected on the terminal strip.
3
R
4
C
Common
Low voltage common. These terminals are internally connected on the terminal
strip.
5
C
6
Y Cool Chilled water valve actuator control input, and thermostat cooling output.
7
W Heat
Wire connection point for hot water valve actuator or 1st stage EH control
input, and thermostat heating output.
8
G Fan Enable Used to allow external start-stop control from an external source.
TOOLS NEEDED FOR INSTALLATION/TROUBLESHOOTING
• Digital multimeter capable of measuring 30 volts AC
• Screwdriver
• Fuse puller (optional)
TABLE F.2 – FIELD INSTALLED COMPONENT DESCRIPTIONS
Name Description
Field-provided Float Switch
To install a oat switch, wire the oat switch leads into S1 and C on the
screw terminals. After wiring the oat switch, remove jumper JP1. The JP1
jumper must be removed for the oat switch to operate correctly.
Note: If a oat switch was installed in the factory, the oat switch may be
connected through a factory-provided harnesses.
Start/Stop for the fan
To start or stop the fan from an external controller, wire the leads for the switch
contacts that will be made or broken to R and G on the screw terminals. After
wiring the switch, verify no jumper is installed between R and G.
Remote 3-speed switch
(Requires SELECT pwm
board)
To add a remote 3-speed switch, remove the jumper between 24VAC and SPD3.
Then wire the leads for the switch to 24VAC, SPD3 (High), SPD2 (Med) and
SPD1 (Low) on the Select PWM board.
JUMPERS
TABLE F.3 – JUMPER DESCRIPTION
Jumper Name Description
JP1
Float Switch Jumper
This jumper is installed between S1 and C when a oat switch is not
installed. The jumper is removed when a oat switch is installed.

Enviro VDD Specifications

General

Brand	Enviro
Model	VDD
Category	Fan
Language	English