and the auxiliary switch in the OFF position, rotate the
Phase sequence shall be L1, L2, L3, N: A, B, C, D with
mode-select switch to VENT. Actuate the auxiliary
E as the equipment ground. Voltage shall be 120 volts
switch to OPERATE-RESET. The vent fans should
line-to-neutral and 208 volts line-to-line.
continue to operate and voltage should be present at the
(b) With Output 1 400 Hz auxiliary
auxiliary output receptacles.
power actuated, the voltage at Output 1 receptacle shall
(i)
Repeat paragraph f, step (15),
remain the same as noted above and there shall be no
(f),above, except rotate mode-select switch to HEAT.
power, ac or de, applied to the no. 1 conditioned air
system under the following operating conditions.
Complete heating system shall be de-energized (shut
off) and voltage shall be present at auxiliary on output
1.
Mode select switch in HEAT
receptacles.
position as heat system select switch is rotated to
positions 1, 2 and 1 and 2 (no. 2 heated air system shall
(j)
Repeat paragraph f, step (15),
operate in position 2 or position 1 and 2).
(f),above, except rotate mode-select switch to COOL.
Complete air-conditioning system shall be deenergized
2.
Mode select switch in
(shut-off) and voltage shall be present at auxiliary
COOL position as air conditioning system select switch
output receptacles.
is rotated to positions 1. 2, and 1 and 2 (no. 2 cooled
air system shall operate in position 2 or position 1 and
g.
Protective Device Checks. The following
2).
checks are to be performed to ensure proper functioning
of electrical system protective circuits.
(c) Place output I auxiliary operation
switch in OFF position and actuate output 2 auxiliary
(1) While reading 400 Hz generator
operation switch to OPERATE-RESET. Check phase
frequency on a frequency meter, slowly reduce turbine
rotation at output 2 receptacle (J102). Phase sequence
speed until meter reads 370 Hz by manually bypassing
shall be L1, L2, L3, N: A, B, C, D with E as equipment
fuel.
Then perform test with the EMERGENCY
ground. Voltage shall be 120 volts line-to-neutral and
OPERATION switch closed and determine that under
208 volts line-to-line.
line. Generator shall be tripped off the line when
(d) With output 2 400 Hz auxiliary
frequency drops to 374 4 Hz with EMERGENCY
power actuated, the voltage output at output 2
OPERATION switch open.
receptacle shall remain the same as noted above and
there shall be no power, ac or dc, applied to the no. 2
(2) Observe and record exact speed
conditioned air system under the following operating
reading as indicated by frequency meter.
Then,
conditions:
operating at no-load, slowly increase turbine speed by
means of governor adjustment screw until overspeed
1.
Mode select switch in HEAT
protective-device actuates. Do not exceed 44,500 rpm.
position as heat system select switch is rotated to
Use fuel bypass to perform this test. Overspeed
positions 1, 2, and I and 2 (no. 1 heated air system shall
protective device must shut down unit between
operate in position 1 or position 1 and 2).
generator frequencies of 420 and 440 Hz. Repeat test
2.
Mode select switch in
with EMERGENCY OPERATION switch closed and
COOL position as air conditioning system is rotated to
ascertain that switch does not render overspeed switch
positions 1, 2, and 1 and 2 (no. 1 cooled air system
inoperative.
Readjust speed to original frequency
shall operate in position 1 or position 1 and 2).
reading.
(e) With both No. 1 and No. 2 400
(3) Both generators shall be operated at
Hz auxiliary operation switches actuated to OPERATE-
no-load and rated speed while performing the following
RESET position, required voltage shall be present at
tests. Ascertain that load contactors are in CLOSED
both Output 1 and Output 2 receptacles and no power
position. Refer to paragraph g, step (7) below.
shall be applied to either conditioned air system in any
(a) Remove connector from voltage
HEAT or COOL mode.
regulator of system being checked. Connect voltage
(f)
Actuate remote operation switch
regulator connector to test box. Adjust rheostat until
to OPERATE-RESET. No voltage shall be present at
base voltage of 120 volts L-N on each generator is set
either of the remote output receptacles (J74 and J75).
up.
(g) With 400 Hz main contactor
(b) Monitor generator voltage on the
closed and remote operation switch, mode-select switch
load side of contactors to determine voltage at which
and auxiliary operation switches in OFF position,
protective panel energizes the GCR and trips load
actuate remote operation switch to OPERATE-RESET.
contactors.
Voltages shall be present at remote output receptacles.
(c) Adjust generator voltage to 128
Actuate auxiliary operation switch to OPERATE RESET.
volts L-N for 30 seconds. Reset to 120 volts L-N.
Voltage shall not be present at remote output
Adjust voltage to 135 volts L-N. Do not exceed 30
receptacles but shall be present at auxiliary output
seconds.
receptacles.
(h) With the remote operation switch
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