TM 5-4220-227-14
4-28. Heater/Chiller Module.
This task covers:
Replace
INITIAL SETUP
Tools
Materials/Parts
General Mechanic's Tool Kit
Heater/Chiller Module
(NSN 5180-00-177-7033)
Propylene Glycol (Item 10, Appendix E)
Replace. (figure 4-10)
(1)
Move heater/chiller switch (1) on heater/chiller module (2) to OFF position and disconnect power cord (3) from
220 Vac electrical power source.
(2)
Close water valve (4) and return valve (5).
(3)
Loosen fitting nut (6) and remove supply hose (7) from elbow (8) and drain fluid into suitable container.
(4)
Loosen fitting nut (9) and remove return hose (10) from elbow (11) and drain fluid into suitable container.
(5)
Remove the heater/chiller module.
(6)
Place heater/chiller module (3) next to chamber heater/chiller penetrator.
(7)
Install return hose (10) on elbow (11) and tighten fitting nut (9).
(8)
Install supply hose (7) on elbow (8) and tighten fitting nut (6).
(9)
Add propylene glycol/water mixture 25% to 75% to reservoir (12) if necessary, to replace fluid lost during
removal procedure.
(10)
Open water return valve (5) and supply valve (4).
(11)
Connect power cord (3) on heater/chiller module (2) to 220 Vac electrical power source.
(12)
Move heater/chiller switch (1) to ON position, allowing compressor and fluid pump to build up pressure.
CAUTION
If hoses are removed from unit, the system must be bled down. Loosen connector on outlet hose (7).
Bleed air, then tighten. Refill reservoir (12).
(13)
Check connections for fluid leaks.
Change 1
4-30
