Adjusted atmos device layers + added new pipe subtypes (#28466)

code/modules/atmospherics/machinery/components/unary_devices/thermomachine.dm

@@ -1,7 +1,8 @@
 /obj/machinery/atmospherics/components/unary/thermomachine
 	name = "thermomachine"
 	desc = "Heats or cools gas in connected pipes."
-	icon_state = "cold_map"
+	icon = 'icons/obj/Cryogenic2.dmi'
+	icon_state = "freezer"
 	var/icon_state_on = "cold_on"
 	var/icon_state_open = "cold_off"
 	density = TRUE
@@ -9,7 +10,8 @@
 	obj_integrity = 300
 	max_integrity = 300
 	armor = list(melee = 0, bullet = 0, laser = 0, energy = 100, bomb = 0, bio = 100, rad = 100, fire = 80, acid = 30)
-
+	layer = OBJ_LAYER
+	
 	var/on = FALSE
 	var/min_temperature = 0
 	var/max_temperature = 0