Operation - heat-timer VSP Installation & Operating Instructions Manual

Output light indicates
w hen system is activ e
Push this button to display
sensor v alues and control
parameters
Secondary loop sensor
Outdoor sensor
Boiler return sensor
OUTPUT LIGHT
The output light has the following three indications:
Light Off
The heating system is not active. Neither the Secondary loop pump nor the Injection pump output are active.
Light On
The heating source output is active. The Secondary loop pump relay is energized, and the speed of the Injection pump
is being controlled.
Flashing
The Secondary loop pump relay is energized to circulate the water through the loop. The Injection pump output is not
active. This would occur when there is a call for heat, but the temperature of the Secondary loop is satisfied so none of
the hot water from the Primary loop is needed in the Secondary loop.
SYSTEM START TEMPERATURE
The System Start (StS) is the outdoor temperature below which the Secondary loop pump will be activated to circulate
water through the loop and the Injection pump speed will be regulated to control the temperature of the Secondary loop
water. When the outdoor temperature rises above this point, the Secondary Pump relay (BLACK wires) and the Injection
pump output (RED wires) will be off. The System Start is adjustable from 30
special modes:
OFF
When the System Start is set to OFF, neither the Secondary loop pump nor the Injection pump will run. This can be
used for testing or to disable heat to the particular loop. Do not use this feature to turn off pumps for maintenance. For
this, use the safety disconnect.
ON
When the System Start is set to ON, the Secondary loop pump will run regardless of outdoor temperature. The
Injection pump speed will be regulated to control the temperature of the Secondary loop water temperature.
Follow the chart on pg. 10 to adjust the System Start.

OPERATION

Digital display defaults to read
secondary loop temperature
O UT PUT
= Air T emp
= Return T emp
= System Start
= Reset Ratio
= O ffset
= Min Return
= Max/Set Point
= Setback
SEC O U T R TN C O M EXT C O M
11
RED
BLACK
VSP
BLUE
UP
Push these buttons to adj ust
PRESS T O READ
control parameters
DO W N
Dry contact input for either
Setback or
Remote Enable/Disable
Sensor common
F to 70 F. The System Start also has two
° °
Inj ection
pump output
Secondary loop
pump output
120VAC
pow er input