IM 1193 / Page 13 of 32
Installing The Valve
Prior to soldering the normally closed two-way valve, open
the ports by slowly moving the manual operating lever to
the retaining notch until lever is secured by valve spring. The
lever will reset to the automatic position the first time the
valve is energized.
Note:
When installing two-way valves, the flow direction is
from end “B” as shown in Figure 18.
Figure 18: 2-way valve installation
N.O. YL
N.C. BL
B
A
Motor
Wire Nuts
Return To
Water System
From
Heat
Coil
Valve Wire Harness
*
*
Connect YL for Normally Open Valves.
Connect BL for Normally Closed Valves
Prior to soldering the normally closed 3-way valve, open
both ports by slowly moving manual operating lever to re-
taining notch until lever is secured by valve spring.
Flow valve and tubing is to be installed so that it does not
restrict removal of the chassis from the sleeve for service.
Note:
When installing three-way diverting valves and
normally closed is required, end “B” is the supply to
coil and end “A” is the bypass end. The inlet port is
unmarked. Port markings “A” and “B” are located on
the bottom of the valve body (Figure 19).
Figure 19: 3-way valve installation
N.O. YL
N.C. BL
B
A
Motor
Wire Nuts
Valve Wire Harness
End "B"
To Coil
(Normally
Closed)
Coil Assembly
Return
*
*
Connect YL for Normally Open Valves.
Connect BL for Normally Closed Valves
Note:
For Erie Model VT32* (pop top), the three-way
valve is only configured as N.C. to “B” port. For N.O.
configuration to the coil, simply turn the valve around.
Procedure
1. The valve is always connected to the supply side of the
coil. See
Figure 16
and
Figure 17 on page 12
. There
are seven possible coil arrangements available. Each is
shown in
Figure 20
through
Figure 26 on page 14
.
Select the illustration that matches the coil supplied, and
pipe it according to the illustration. Install valve and
other accessories including air vents, steam traps, stop
balance valves, etc., as specified by the design engineer.
2. For valve installed on right side of the unit, make
electrical connection to matching cap extending from
the control box. For left side valve, make electrical
connection to cap mounted to left side of chassis.
Note:
1. When the heating medium is steam, the supply
connection should be attached to the uppermost
tube and the return to the lower tube. The
coil is pitched in the casing to allow drainage of
condensate.
2. When the heating medium is hot water, the supply
connection should be made to the lowermost
tube and the return to the uppermost tube.
Hot water coils should be “flooded” to minimize air
entrapment.
Valve Wiring
If the black valve motor leads are not accessible from the
valve housing, remove the valve cover.
1. Connect the factory supplied valve wire harness leads
to the two valve motor leads (not the end switch leads)
using the supplied wire nuts (
Figure 18
).
Note: The fiber washer and strain relief supplied with the
valve harness must be located in the valve motor
enclosure after assembly.
2. Using the two remaining wire nuts, connect the wires
from the chassis wire harness to valve harness.
3. Connect one of the BK wires from the valve to BK wire
from the chassis.
• For normally open valves, connect the YL chassis
harness wire to the second BK wire from the valve.
• For normally closed valves, connect the BL chassis
harness wire to the second BK wire from the valve.
4.
Cut either the YL or BL wire that is not being used at the
plastic male connector on the control panel.
5.
The Heat Fan Lockout (HFLO) must be installed on
the return piping of the hot water coil and after the
steam trap for steam heat units. The Factory provides
a thermistor sensor to be attached to the piping with a
cable tie.
6. Replace the valve cover.
