Install Instructions

installation &
operating instructions
Armstrong
Compass H
6
7.0 systems with bypass valve between
flow and return pipes
7.1 purpose of bypass valve
The purpose of a dierential pressure bypass valve is to ensure
that the heat from the boiler can be distributed when all valves
in the underfloor-heating circuits and/or thermostatic radiator
valves are closed. These valves were commonly applied in multi
zone systems with traditional fixed speed pumps.
A Compass H circulator can eliminate the need for a dieren-
tial bypass valve when used in Auto or proportional pressure
modes, because the circulator will reduce speed when the
valves in the system close and the heat demand is reduced.
If you are servicing an existing system with a bypass valve and
you are replacing a fixed speed circulator with a Compass H
circulator, there is no need to remove or open/ close the bypass
valve, leave as it is currently installed.
8.0 start-up
8.1 before start-up
Fill the system with liquid and properly vent the system before
starting the pump. The required minimum inlet pressure in rela-
tion to liquid temperature must be available at the pump inlet
(see section 11).
8.2 venting the pump
Even with system vented, air may be still be present in the
pump. The air in the pump may cause noise but the noise
should cease after a few minutes running.
The venting process can be shortened by setting the pump to
run at speed III for a short period of time (20 seconds).
Once the pump is vented and (the noise has ceased), set the
pump mode according to the recommendations (see section 6).
caution
The pump must not run dry.
9.0 pump settings and pump performance
9.1 relation between pump setting
and pump performance
fig. 12 Pump setting in relation to pump performance
Select the optimum setting:
The Compass H circulator comes with 9 modes of operation.
There are three fixed speed curve options which will operate
just like traditional fixed speed circulators, except that Compass
H motor technology is far more energy ecient than traditional
fixed speed circulators.
The proportional pressure curves operate as Sensorless dif-
ferential pressure circulators. These curves follow pre-selected
performance curves and will reduce flow and energy consump-
tion when the valves in the system close or open and the flow
requirements are reduced.
The constant pressure curves and auto mode maintain pre-
selected pressure ratings at the circulator.
auto mode operates on the sensorless dierential pressure
principle, but will Learn usage patterns and adjust circulator
performance over time to optimize energy eciency. The oper-
ating point will be within the gray envelope seen in fig. 12 .
pc1
pc2
pc3
pc4
iii
ii
head - ft.wg.
flow - usgpm
i
20
22
24
20
22
18
18
16
16
14
14
12
12
10
10
8
8
4
4
6
6
2
2
0
0
auto
pc4
pc3
pc2
pc1
iii
ii
i
speed pressure curve
auto