Honeywell V100P, Y100P Installation Instructions Manual

V100P, Y100P Radiator Valve

DESCRIPTION

The V100P Radiator Valve is designed to automatically
control temperatures of one-pipe low pressure steam
radiators, convectors, or other heating units. Install the
V100P Radiator Valve with a T100 Thermostatic Control
and an SA123A (or equivalent) steam/air vent (see Fig. 1).
The Y100P includes the V100P Valve and the SA123A
Steam/Air Vent. V100P Radiator Valves are cast bronze,
with nickel plating. The working parts are designed as an
easily replaceable cartridge. A resilient seat disk provides
positive shut-off.

FOR ONE-PIPE STEAM SYSTEMS

INSTALLATION INSTRUCTIONS

SA123A

V100P

T100A

SPECIFICA TIONS

Valve

Maximum Temperature:

248°F (120°C).

Maximum Pressure:

15 psi (103 kPa).

Size:

1/8 in. angle body only.

SA123A Steam/Air Vent

Vent Port:

1/16 in.

Maximum Operating Pressure:

6 psi (41 kPa).

Height:

3-3/4 in.

M11752

Fig. 1. Mounted V100P Valve, SA123A Steam/Air

Vent, and T100A Controller.

OPERA TION

The V100P Radiator Valve works in conjunction with an
SA123A (or equivalent) steam/air vent (see Fig. 1).
During a call for heat, the valve opens, allowing air to
vent from the radiator. This, in turn, allows steam to flow
into the radiator. When the space temperature reaches
the setpoint, the valve closes, preventing air from
venting. When the valve is closed, the radiator cools.
The control has a modulating rather than an on/off
action to minimize room temperature changes.

Copyright © 1998 Honeywell Inc. • All Rights Reserved

62-3006-2

V100P RADIATOR VALVE FOR ONE-PIPE STEAM SYSTEMS

The V100P is only one component of a one-pipe steam
conversion. Full conversion requires additional
components. For proper temperature control, Honeywell
recommends the following system modifications in
addition to the V100P:

1. A boiler interval timer to provide proper boiler
cycling.

2. Vacuum breakers on the supply piping, or on the
individual radiators to allow air to enter during the
boiler off cycles. Air entry is required to ensure
optimum control.

INST ALLATION

Install V100P Radiator Valves on the vent connection
tapping of a radiator or convector. Use thread sealant
on all connections.

1. Remove old steam/air vent from radiator or
convector.

2. Screw in 1/8 in. male fitting and V100P Valve.
NOTE: The V100P requires horizontal

positioning, or use of a controller with a
remote sensor.

3. Install steam/air vent into V100P.

IMPORTANT

Mount the vent vertically.

4. Install T100 series operator using instructions
included with the unit.

5. Set control to desired setpoint. Valve
automatically controls steam flow to maintain
temperature.

CHECKOUT

If radiator fails to heat:

1. Check that the boiler interval timer is installed
and operating.

2. Check that the vacuum breakers are installed
and operating.

3. Check for proper venting of air:

a. Turn control setpoint to the highest number.
b. If no air is released, turn the control setpoint

to minimum and remove the vent.

c. Check for adequate pressure by slowly

turning the control toward maximum. Steam
flow through the vent port verifies adequate
pressure. Turn setpoint to minimum.

d. If steam flows through the vent port, repair

or replace vent.

e. If steam does not flow through the vent port,

check for blockage in the valve body,
cartridge and the piping.

NOTE: See controller Installation Instructions for

additional troubleshooting procedures.

Home and Building Control

Honeywell Inc.
Honeywell Plaza
P.O. Box 524
Minneapolis, MN 55408-0524

62-3006—1

62-3006—2 B.B. Rev. 10-98

Home and Building Control

Honeywell Limited-Honeywell Limitée
155 Gordon Baker Road
North York, Ontario
M2H 3N7

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