P-9-TM-457-35 T.O. 35C2-3-442-2
p. Adjust flame switch (8), refer to
cam ring (63), Align scribe marks, and
tighten screws (57) evenly.
g. Test coolant pump assembly (56).
q. Install cover (l).
COMPONENT TEST AND
h. After coolant pump has been reas-
sembled and tested, flush with corrosive
preventive compound, Military Specification
The following procedures cover
testing and adjustments of individual
a. Coolant Pump Assembly. Coolant
Make certain that the lead wire
from blower motor assembly (75)
tested before being reinstalled in the heater.
is on the side of the blower
Test coolant pump assembly as follows:
opposite the name plate.
1. Connect motor and pump assem-
i. Assemble motor and pump assembly
(55), inlet (53), plate (51), and fan (50)
before installing into burner assembly (48).
2. Turn power switch to ON and
run-in unit for approximately 15 minutes.
j. Install burner assembly (48) and
3. Test relief valve by closing
manual shut-off valve. Discharge pressure
k. Install cover (36).
should not exceed 30 to 35 PSI when valve
is closed. Open and close valve a few
1. Install regulator valve assembly (21),
times to check consistency of valve per-
formance. Replace relief valve spring if
pressure exceeds 30 to 35 PSI.
4. To check pump for rated flow and
Use care when installing quartz
pressure, adjust valve in discharge line
rod (14) as it is easily broken if
until a reading of 2 PSI is obtained on pres-
m. After installing quartz rod (14),
5. Using a suitable timer, check for
gently raise the rod up and down to see if it
rated flow of 80 GPH minimum at 2 PSI dis-
moves freely in the stainless tube. Also
charge pressure. Amperage draw should
make sure at least 1/32 inch extends out of
not exceed 6 amperes during this test.
tube when rod is resting on bottom.
6. Check motor RPM using a strobe
n. Install flame switch assembly (8) and
light. Motor shaft speed should be 8500 RPM.
terminal block (5).
7. Observe smoothness of operation
o. Install receptacle assembly (3) with
of both pump and motor. Seal leakage of
key located on the top.
1 cubic centimeter per hour (seal may show