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002000MAN-01
1-Jun-2018
2. Hydronic Heating: Signals Control
In this control method, hydronic heating demand comes
from an external device, like a 2-stage aquastat, combination of
aquastats, or other controller with a dry contact that relays a
24VAC signal. See
Wiring
section.
TABLE 20 - Typical Aquastat Settings
Stage 1
Stage 2
Stage 3
Item
°
F
°
C
°F
°C
°F
°C
Setpoint
108
42
105
41
90
32
Delta
8
4
8
4
20
11
Activation *
100
38
97
37
70
21
Delay
10 minutes
*Activation is determined by the Setpoint and Delta values
The following table shows typical settings for the aquastat.
With these settings, stage 1 will activate when the tank tempera-
ture reaches the activation point. If the load is too great, the
tank temperature will continue to drop when heating until stage
2 is activated. As the tank temperature stops dropping and be-
gins to increase when heating, stage 2 will turn off before stage
1, rather than at the same time as stage 1. There are three
main advantages to this:
Less aquastat probe lag leading to reduced overshoot as the
tank temperature rate of change is reduced when only stage
1 is active.
Prolonged stage 1 run time leads to increased efficiency.
Reduced number of compressor starts.
The settings may be changed as desired; however stage 1
setpoint for heating should not exceed
120°F (49°C)
; stage 1
cooling setpoint should not be set below
43°F (6°C).
Exceed-
ing these setpoint limits will cause the heat pump operating
pressures to approach the safety control settings, possibly caus-
ing nuisance shut downs.
If only floor zones are being heated, it is highly recom-
mended to drop each of the heating setpoints by 10°F (5°C)
for increased efficiency.
When using Signals Control, the backup tank element ther-
mostat can be set to maximum, allowing the electric elements to
be controlled by an external contactor placed in the power sup-
ply connections (see
Wiring
section). The contactor can be con-
nected to stage 2 of the heating aquastat via an optional 0-
2hour timer.
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