Universal Enterprise MA1 Installation Manual

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MA1

INSTRUCTION MANUAL

Introduction

The MA1 is a high sensitivity direct reading AC ammeter. It is designed
to simplify the setting of oil and gas thermostat heat anticipator and for
measuring the performance of AC relays, solenoids and other low cur­rent AC devices.

Features include

• Ranges: 0 - 1.2 AC Amps

• A c c u r a cy: ±3% of full sca l e

Safety Notes

Before using this meter, read all safety information carefully. In
this manual the word "WARNING" is used to indicate conditions
or actions that may pose physical hazards to the user. The word
"CAUTION" is used to indicate conditions or actions that may
damage this instrument.

Operating Instructions

WARNING!

Like all direct reading ammeters, the MA1 must be connected IN
SERIES with the circuit under test. The maximum value of current
that can be measured with the MA1 is 1.2 AC amperes (1,200 AC
milliamps). Do not exceed this value or the MA1 may be damaged.

Testing Heat anticipator

For the most efficient operation, the heat anticipator in the thermostat
must be set to correspond to the value of the control circuit current.

Thermostats are of two types: preset or adjustable. Many cooling
thermostats and some heating thermostats are preset. these require
no adjustment.

Adjustable thermostats should be set to the value of current noted on
the furnace rating label. If this information is not available then the
control current must be measured and the heat anticipator set to the
measured value of current as follows:

1. Remove the thermostat cover from the sub base.

2. Set the furnace controls to the ON position

3. For thermostats with a single stage heat control connect one lead
of the MA1 to the “R” terminal on the sub base and the other
lead of the MA1 to the “W” terminal (Fig 1).

4. Note the magnitude of the current on the meter scale of the MA.
Set the heat anticipator to this value of current.

5. For thermostats with a two stage heat control repeat steps 1 thru
4 for stage 1. The second stage heat control current is measured
by connecting one lead of the MA1 to the “RH” terminal and the
other lead to the “W2” terminal (Fig 2).

6. Replace the thermostat cover and check the system for
proper operation.

NOTE: If a fan limit control is used this can affect the length of
the heating cycle. Check the ON and OFF fan control set points.

NOTE: If a longer heating cycle is desired, the pointer on the sub base
can be adjusted to a slightly higher setting. If a shorter cycle is desired
the pointer can be adjusted to a slightly lower setting.

Typical Values of Control Circuit Current:

1. 0.2 amperes for gas furnace without spark igniter.

2. 0.4 thru 0.8 amperes for gas furnace with spark igniter.

3. 1.0 amperes for oil furnace.

Other Uses For MA1

The MA1 can also be used to check the operating current of AC relays,
solenoids, motors and other devices rated at 1.2 AC amperes or less.

1. Turn OFF the power to the device to be tested.

2. Disconnect one of the power input leads at the device to be tested.

3. Connect one lead of the MA1 to the device and the other lead to
the power input wire previously disconnected (Fig 3).

MA1-MAN P. 1

(Fig 1)

(Fig 2)

(Fig 3)

MA1

Typical
sub base

MA1

Power input lead

MA1

Typical
sub base

Motor